Abrégé

A method of digital communications includes transmitting, by a transmitting device, a transmission waveform to one or more receiving devices using one or more time and frequency resources of a transmission medium. The time and frequency resources are divided into physical resource blocks (PRBs) that are configured according to a PRB configuration scheme. Each PRB is generated from a corresponding orthogonal time frequency space (OTFS) frame. Each OTFS frame is generated from symbols along delay and Doppler dimensions using an OTFS framing scheme.

Classes IPC  ?

• H04J 11/00 - Systèmes multiplex orthogonaux
• H04L 25/03 - Réseaux de mise en forme pour émetteur ou récepteur, p. ex. réseaux de mise en forme adaptatifs
• H04L 27/26 - Systèmes utilisant des codes à fréquences multiples
• H04W 72/044 - Affectation de ressources sans fil sur la base du type de ressources affectées
• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission

Abrégé

Methods, systems and devices for wireless communication are described. One example method includes performing, by a network device, gain, phase and timing imbalance calibrations of multiple wireless devices in a wireless network, estimating, by the network device, angles of arrivals of the multiple wireless devices, determining wireless device grouping based on geometric properties including angels of arrivals of the multiple wireless devices, scheduling data collection from the multiple wireless devices based on the geometric properties, and simultaneously scheduling groups of wireless devices from the multiple wireless devices for data transmission or reception based on the grouping.

Classes IPC  ?

• H04W 64/00 - Localisation d'utilisateurs ou de terminaux pour la gestion du réseau, p. ex. gestion de la mobilité

Abrégé

Methods, systems and devices for wireless communication are described. An example method for wireless communication includes controlling a sweep of channel estimation transmissions across a two-dimensional antenna array comprising N horizontal antennas and M vertical antennas according to an operational condition in a wireless communication network. In one example, a pattern used for the sweep sweeps across horizontal antennas followed by a sweep across vertical antennas. In another example, a pattern used for the sweep sweeps across vertical antennas followed by a sweep across horizontal antennas.

Classes IPC  ?

• H04L 25/02 - Systèmes à bande de base Détails
• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission
• H04L 5/14 - Fonctionnement à double voie utilisant le même type de signal, c.-à-d. duplex

Abrégé

A method of wireless communication includes configuring a resource manager to schedule transmissions by interfacing with a radio access network (RAN) according to an application programmer's interface (API), wherein the RAN is providing wireless connectivity to a plurality of user devices, scheduling multiple first transmissions from the RAN to one or more target user devices by sending multiple first scheduling messages according to the API, indicating, for each first scheduling message, that the resource manager is requesting a feedback of status of a corresponding transmission grant scheduled according to the each first scheduling message according to a first feedback scheme. The operational points of the multiple transmissions are perturbed according to the feedback.

Classes IPC  ?

• H04W 24/10 - Planification des comptes-rendus de mesures
• H01Q 3/26 - Dispositifs pour changer ou faire varier l'orientation ou la forme du diagramme de directivité des ondes rayonnées par une antenne ou un système d'antenne faisant varier la phase relative ou l’amplitude relative et l’énergie d’excitation entre plusieurs éléments rayonnants actifsDispositifs pour changer ou faire varier l'orientation ou la forme du diagramme de directivité des ondes rayonnées par une antenne ou un système d'antenne faisant varier la distribution de l’énergie à travers une ouverture rayonnante
• H04B 7/0456 - Sélection de matrices de pré-codage ou de livres de codes, p. ex. utilisant des matrices pour pondérer des antennes
• H04B 7/06 - Systèmes de diversitéSystèmes à plusieurs antennes, c.-à-d. émission ou réception utilisant plusieurs antennes utilisant plusieurs antennes indépendantes espacées à la station d'émission
• H04W 24/02 - Dispositions pour optimiser l'état de fonctionnement
• H04W 24/08 - Réalisation de tests en trafic réel

Abrégé

Methods, systems, and devices for spectral sharing wireless systems, wherein multiple user devices share time and frequency resources for uplink and/or downlink transmissions, are described. One example wireless communication system includes a network station, and multiple user devices, wherein data transmissions over the same time and frequency resources are shared between multiple user devices, in downlink and/or uplink, using spatial user device separation that is dynamically computed by the network station, and where the network station derives spatial user device separation based on uplink channel measurements.

Classes IPC  ?

• H04W 72/121 - Planification du trafic sans fil pour les groupes de terminaux ou d’utilisateurs
• H04B 7/0456 - Sélection de matrices de pré-codage ou de livres de codes, p. ex. utilisant des matrices pour pondérer des antennes
• H04L 5/14 - Fonctionnement à double voie utilisant le même type de signal, c.-à-d. duplex
• H04W 72/542 - Critères d’affectation ou de planification des ressources sans fil sur la base de critères de qualité en utilisant la qualité mesurée ou perçue

Abrégé

Methods and systems directed to numerologies of a pulse-tone modulation scheme are described. An example method includes allocating transmission resources to one or more transmissions in a wireless network according to a first numerology that defines a first resource unit along a first resource dimension and a second resource unit along a second resource dimension in a first two-dimensional resource plane, and generating, based on allocated transmission resources, one or more transmission waveforms for N receiving devices, where N is a positive integer. An example system includes one or more processors configured to implement the above-described method.

Classes IPC  ?

• H04L 27/26 - Systèmes utilisant des codes à fréquences multiples
• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission
• H04W 72/0446 - Ressources du domaine temporel, p. ex. créneaux ou trames
• H04W 88/06 - Dispositifs terminaux adapté au fonctionnement dans des réseaux multiples, p. ex. terminaux multi-mode
• H04L 27/01 - Égaliseurs
• H04W 72/04 - Affectation de ressources sans fil

Abrégé

Channel sensing is performed using one or more signal transmissions that are included in gaps (e.g., inter-tile spacings or inter-frame spacings) separating data frame transmissions in a digital communication system. The signal transmissions comprise pulse-tone signals that are invariant under time, delay and Doppler shifts. The number of channel sensing signal transmissions performed within a gap and in all gaps within a frame are a function of an expected maximum delay spread or an expected maximum Doppler spread among all the channels that are being sensed. An example transmitter is configured to perform a channel sensing signal transmission, and sense a channel using feedback received based on the channel sensing signal transmission. An example receiver is configured to receive a channel sensing signal, and provide feedback. An example user-device is configured to use one or more channel parameters in the feedback to configure a transceiver for subsequent communications.

Classes IPC  ?

• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission
• H04B 17/309 - Mesure ou estimation des paramètres de qualité d’un canal
• H04B 17/391 - Modélisation du canal de propagation
• H04W 28/24 - Négociation de l'agrément du niveau de service [SLA Service Level Agreement]Négociation de la qualité de service [QoS Quality of Service]
• H04W 52/42 - Commande de puissance d'émission [TPC Transmission power control] le TPC étant effectué dans des situations particulières dans des systèmes à diversité de temps, d'espace, de fréquence ou de polarisation
• H04W 72/0446 - Ressources du domaine temporel, p. ex. créneaux ou trames
• H04W 72/0453 - Ressources du domaine fréquentiel, p. ex. porteuses dans des AMDF [FDMA]
• H04W 72/23 - Canaux de commande ou signalisation pour la gestion des ressources dans le sens descendant de la liaison sans fil, c.-à-d. en direction du terminal
• H04W 74/00 - Accès au canal sans fil

Abrégé

A method of wireless communication includes performing a first measurement of a wavefront received at a first antenna of a base station configured to provide a wireless communication access to user devices in a coverage area, performing a second measurement of the wavefront received at a second antenna of the base station, wherein the first antenna and the second antenna are separated by a separation distance along a direction, deriving a compensation factor from the first measurement and the second measurement, wherein the compensation factor is used for estimating an estimated angle of arrival (AOA) and performing the subsequent communication by applying the compensation factor to an outgoing or an incoming signal waveform to or from a user device.

Classes IPC  ?

• G01S 5/02 - Localisation par coordination de plusieurs déterminations de direction ou de ligne de positionLocalisation par coordination de plusieurs déterminations de distance utilisant les ondes radioélectriques
• H04B 7/06 - Systèmes de diversitéSystèmes à plusieurs antennes, c.-à-d. émission ou réception utilisant plusieurs antennes utilisant plusieurs antennes indépendantes espacées à la station d'émission

Abrégé

A digital communication method includes assigning, to a transmission signal, first transmission resources in a delay-Doppler domain transmission grid comprising a plurality of physical resource blocks (PRBs), wherein each PRB comprises one or more pulses, each pulse occupying a resource element defined by a delay unit and a Doppler unit; and causing transmission of a transmission waveform for the first transmission signal.

Classes IPC  ?

• H04L 27/26 - Systèmes utilisant des codes à fréquences multiples
• H04W 72/04 - Affectation de ressources sans fil
• G08C 15/00 - Dispositions caractérisées par l'utilisation du multiplexage pour la transmission de plusieurs signaux par une voie commune
• H04J 11/00 - Systèmes multiplex orthogonaux
• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission
• H04Q 11/00 - Dispositifs de sélection pour systèmes multiplex

Produits et services

Wireless broadband communication services; telecommunications services, namely, transmission and processing of data signals by means of wireless networks Computer services, namely, design and development of computer software in the field of wireless communications for increasing bandwidth of wireless connectivity across computer networks; design and development of software and hardware for digital signal processing; providing online non-downloadable software for increasing bandwidth of wireless connectivity across computer networks in the field of wireless communications; software design and development

Abrégé

Methods, systems, and devices for facilitating operation of a wireless communication network are described. One example method includes providing, by a first network function, a multi-user multiple-input multiple-output (MU-MIMO) capability to wireless devices in a wireless communication network via an MU-MIMO configuration; generating, based on the MU-MIMO configuration, a proposed schedule of transmissions and receptions for the wireless devices, wherein the MU-MIMO configuration comprises one or more quality-of-service (QoS) parameters associated with the transmissions and receptions; and communicating the proposed schedule to a second network function that is logically and physically separated from the first network function. The second network function is configured to determine, based on a time criticality of pending communication tasks, a final schedule of the transmissions and receptions by overwriting entries of the proposed schedule.

Classes IPC  ?

• H04B 7/0452 - Systèmes MIMO à plusieurs utilisateurs
• H04W 72/56 - Critères d’affectation ou de planification des ressources sans fil sur la base de critères de priorité
• H04W 72/12 - Planification du trafic sans fil
• H04W 72/04 - Affectation de ressources sans fil

Abrégé

A method of wireless communication performed by a base station includes grouping a plurality of wireless devices associated with a coverage area of the base station into multiple spatial groups, and configuring the wireless devices in each spatial group to use overlapping time-frequency transmission resources for uplink (UL) data transmissions to the base station. The method also includes scheduling, on a same set of time-frequency transmission resources, demodulation reference signal (DMRS) transmissions by the wireless devices in a respective spatial group of the multiple spatial groups. In various aspects, the multiple spatial groups are determined based on respective estimated angles of arrival of the plurality of wireless devices associated with the coverage area of the base station. In some instances, each of the wireless devices in the respective spatial group uses the same antenna ports as the other wireless devices in the respective spatial group for the DMRS transmissions.

Classes IPC  ?

• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission
• H04W 72/1263 - Jumelage du trafic à la planification, p. ex. affectation planifiée ou multiplexage de flux
• H04W 72/232 - Canaux de commande ou signalisation pour la gestion des ressources dans le sens descendant de la liaison sans fil, c.-à-d. en direction du terminal les données de commande provenant de la couche physique, p. ex. signalisation DCI

Abrégé

Methods, apparatus, systems for digital communication are described. One example method includes generating, by a transmitter apparatus, a transmission waveform by applying a discrete filter to an input signal in a delay-Doppler domain, wherein the discrete filter is periodic in delay domain and in Doppler domain; and controlling a transceiver to transmit the transmission waveform over a channel.

Classes IPC  ?

• H04L 27/26 - Systèmes utilisant des codes à fréquences multiples
• H04L 27/20 - Circuits de modulationCircuits émetteurs
• H04L 27/00 - Systèmes à porteuse modulée
• H04L 27/12 - Circuits de modulationCircuits émetteurs
• H04L 27/04 - Circuits de modulationCircuits émetteurs
• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission
• H04L 27/148 - Circuits de démodulationCircuits récepteurs avec démodulation utilisant les propriétés spectrales du signal reçu, p. ex. en utilisant des éléments sélectifs de la fréquence ou sensibles à la fréquence utilisant des filtres, y compris des filtres du type PLL

Abrégé

Methods, systems and devices for wireless communication are described. One example method includes mapping information bits to transmission resources in a two-dimensional delay-Doppler grid. In this example, the two-dimensional delay-Doppler grid includes N Doppler elements along a Doppler dimension and M delay elements along a delay dimension, and N and M are positive integers. The example method continues with converting a result of the mapping to a signal waveform, and generating an orthogonal time frequency space (OTFS) waveform by spreading the signal waveform using a spreading scheme. In some examples, the signal waveform includes an ultra-wide band (UWB) waveform.

Classes IPC  ?

• H04L 27/26 - Systèmes utilisant des codes à fréquences multiples
• H04L 27/10 - Systèmes à courant porteur à modulation de fréquence, p. ex. utilisant une manipulation à décalage de fréquence

Abrégé

A method of data communication includes operating a first interface of a channelizer for transmitting a transmit channel to and receiving a first data stream from a wideband radio; operating a second interface of the channelizer to exchange information with distributed unit (DU) functions of multiple network operators, wherein the operating the second interface includes: de-channelizing the first data stream received from the wideband radio into multiple channel streams, wherein each of the multiple channel streams is provided to a corresponding DU function of the DU functions of the multiple network operators; and channelizing multiple second data streams received from the DU functions by multiplexing according to a scheme into the transmit channel that is transmitted over the first interface to the wideband radio.

Classes IPC  ?

• H04L 5/02 - Canaux caractérisés par le type de signal
• H04L 5/08 - Canaux caractérisés par le type de signal les signaux étant représentés par différentes fréquences chaque combinaison de signaux de différents canaux étant représentée par une fréquence déterminée
• H04W 80/00 - Protocoles de réseaux sans fil ou adaptations de protocoles à un fonctionnement sans fil
• H04W 92/12 - Interfaces entre des dispositifs formant réseau hiérarchiquement différents entre des points d'accès et des contrôleurs de points d'accès
• H04W 84/00 - Topologies de réseau
• H04W 88/00 - Dispositifs spécialement adaptés aux réseaux de télécommunications sans fil, p. ex. terminaux, stations de base ou points d'accès
• H04W 88/10 - Dispositifs formant point d'accès adapté au fonctionnement dans des réseaux multiples, p. ex. points d'accès multi-mode
• H04W 88/08 - Dispositifs formant point d'accès

Abrégé

Methods, systems and devices for wireless communication are described. One method includes obtaining a two-dimensional delay-Doppler representation of a received wireless signal that is received over a wireless channel, determining an estimated channel response of the wireless channel from a portion of the delay-Doppler grid corresponding to a channel estimation portion, performing, using the estimated channel response, channel equalization in the delay-Doppler domain, generating, based on the channel equalization, a posteriori probability estimates of data symbols in the received wireless signal, wherein the a posteriori probability estimates are generated based on a priori feedback that is generated using an iterative process and further processing the a posteriori probability estimates of data symbols to recover information bits from the received wireless signal.

Classes IPC  ?

• H04L 25/02 - Systèmes à bande de base Détails
• H04L 25/03 - Réseaux de mise en forme pour émetteur ou récepteur, p. ex. réseaux de mise en forme adaptatifs
• H04L 27/26 - Systèmes utilisant des codes à fréquences multiples

Abrégé

A method implemented at a receiver-side in a digital communication network includes receiving a received signal over a transmission channel, determining, by processing the received signal in a delay-Doppler domain, an estimate of cross-correlation between the received signal and a known reference signal that makes up the received signal, and estimating a delay-Doppler domain channel characteristic of the transmission channel based on the estimate of cross-correlation.

Classes IPC  ?

• H04L 27/26 - Systèmes utilisant des codes à fréquences multiples
• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission
• H04B 1/707 - Techniques d'étalement de spectre utilisant une modulation par séquence directe
• H04B 1/713 - Techniques d'étalement de spectre utilisant des sauts de fréquence

Abrégé

Methods, systems and devices for wireless communication are described. An example method for wireless communication includes controlling a sweep of channel estimation transmissions across a two-dimensional antenna array comprising N horizontal antennas and M vertical antennas according to an operational condition in a wireless communication network. In one example, a pattern used for the sweep sweeps across horizontal antennas followed by a sweep across vertical antennas. In another example, a pattern used for the sweep sweeps across vertical antennas followed by a sweep across horizontal antennas.

Classes IPC  ?

• H04L 25/02 - Systèmes à bande de base Détails
• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission
• H04L 5/14 - Fonctionnement à double voie utilisant le même type de signal, c.-à-d. duplex

Abrégé

A wireless communication method includes receiving, by a first wireless device during a training phase, reference tones using a first number of resource elements from a transmitter of a second wireless device, wherein the first wireless device comprises multiple receiving antennas, estimating, by the first wireless device, from the receiving the reference tones, a second order statistics of wireless channels between the multiple receiving antennas and the transmitter of the second wireless device, and performing channel estimation, during an operational phase subsequent to the training phase, using the second order statistics and reference tones received on a second number of resource elements, wherein the second number is less than the first number.

Classes IPC  ?

• H04L 25/02 - Systèmes à bande de base Détails
• H04B 7/0413 - Systèmes MIMO
• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission

Abrégé

Methods, systems and devices for fractional cooperative multipoint network operation are described. One example method for wireless communication includes determining, by a network device, a cooperative multipoint (COMP) management status of wireless devices served by the network device, and providing, by the network device, wireless connectivity to the one or more wireless devices, wherein the network device jointly manages transmission resources for a first wireless device due to the COMP management status being a joint COMP status and the network device locally manages transmission resources for a second wireless device due to the COMP management status being a local COMP status.

Classes IPC  ?

• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission
• H04B 7/0452 - Systèmes MIMO à plusieurs utilisateurs

Abrégé

Methods, systems, and devices for spectral sharing wireless systems, wherein multiple user devices share time and frequency resources for uplink and/or downlink transmissions, are described. One example method includes transmitting transmission symbols from the network station to at least one user device by processing through a first precoder and a pre-compensation stage, wherein the pre-compensation stage is selected to have the transmission symbols receivable at the at least one user device to appear as if the transmission symbols are processed by a second precoder different from the first precoder.

Classes IPC  ?

• H04B 7/06 - Systèmes de diversitéSystèmes à plusieurs antennes, c.-à-d. émission ou réception utilisant plusieurs antennes utilisant plusieurs antennes indépendantes espacées à la station d'émission
• H04B 7/10 - Diversité de polarisationDiversité de direction
• H04L 5/14 - Fonctionnement à double voie utilisant le même type de signal, c.-à-d. duplex

Abrégé

A network transceiver apparatus is configured to allow simultaneous carriage of multiple network operators' entire cellular spectrum traffic to and from wireless user devices using a wideband antenna. The wideband antenna provides a spherical radiation pattern that allows the operation of the wideband antenna at a power that is at least 8 dB below conventional techniques. An example wireless communication method, in accordance with the disclosed embodiments, includes configuring a transceiver apparatus comprising a transmit chain and a receive chain, and providing wireless connectivity to multiple user devices operating in multiple network operators' networks in a multi-user multi-input multi-output configuration.

Classes IPC  ?

• H04B 7/0452 - Systèmes MIMO à plusieurs utilisateurs
• H04B 7/0413 - Systèmes MIMO
• H04B 7/02 - Systèmes de diversitéSystèmes à plusieurs antennes, c.-à-d. émission ou réception utilisant plusieurs antennes
• H04W 88/08 - Dispositifs formant point d'accès
• H04W 92/00 - Interfaces spécialement adaptées aux réseaux de télécommunications sans fil

Abrégé

Methods, systems, and devices for channel calibration based on parameter perturbation are described. An example wireless communication method includes determining a current precoding operational point (OP) for transmissions to one or more wireless devices, performing a first (and second) set of measurement transmissions having a first (and second) precoding OP that is positively (negatively) perturbed from the current precoding OP by a first (second) perturbation value, and estimating, based on one or more feedback signals received from the one or more wireless devices in response to the first set of measurement transmissions and the second set of measurement transmissions, a next precoding OP to be used for transmissions from the network device to the one or more wireless devices.

Classes IPC  ?

• H04B 7/0456 - Sélection de matrices de pré-codage ou de livres de codes, p. ex. utilisant des matrices pour pondérer des antennes
• H04B 7/04 - Systèmes de diversitéSystèmes à plusieurs antennes, c.-à-d. émission ou réception utilisant plusieurs antennes utilisant plusieurs antennes indépendantes espacées
• H04W 76/20 - Gestion de connexions établies

Abrégé

Methods, systems and devices for wireless communication are described. One example method includes generating a transmission waveform comprising modulated data symbols carrying information bits, wherein the modulated data symbols are organized in a number of data frames along a delay-Doppler grid comprising N Doppler elements and M delay elements, where N and M are positive integers, and transmitting the transmission waveform using frequency and time resources wherein: (a) a reduced power frequency portion of the frequency resources is configured such that a power of the transmission waveform in the reduced power frequency portion is below a first threshold, or (b) a reduced power time portion of the time resources is configured such that the power of the transmission waveform in the reduced power time portion is below a second threshold.

Classes IPC  ?

• H04L 27/26 - Systèmes utilisant des codes à fréquences multiples

Abrégé

Methods, systems and devices for massive cooperative multipoint network operation are described. One example method for wireless communication includes transmitting, by a network node serving a plurality of mobile devices in a surrounding area, channel condition information and scheduling information for one or more of the plurality of mobile devices to a network-side server, receiving, by the network node from the network-side server, control information for scheduling transmissions to or from each of the one or more of the plurality of mobile devices, and controlling, by the network node and based on the control information, a communication to or from the one or more of the plurality of mobile devices at a future time or a different frequency band or a different spatial direction.

Classes IPC  ?

• H04B 7/024 - Utilisation coopérative d’antennes sur plusieurs sites, p. ex. dans les systèmes à plusieurs points coordonnés ou dans les systèmes coopératifs à "plusieurs entrées plusieurs sorties" [MIMO]
• H04W 36/00 - Dispositions pour le transfert ou la resélection
• H04W 36/08 - Resélection d'un point d'accès
• H04W 36/18 - Exécution d'une resélection à des fins spécifiques pour permettre une resélection sans coupure, p. ex. une resélection en douceur

Abrégé

Computerized wireless transmitter/receiver system that automatically uses combinations of various methods, including transmitting data symbols by weighing or modulating a family of time shifted and frequency shifted waveforms bursts, pilot symbol methods, error detection methods, MIMO methods, and other methods, to automatically determine the structure of a data channel, and automatically compensate for signal distortions caused by various structural aspects of the data channel, as well as changes in channel structure. Often the data channel is a two or three dimensional space in which various wireless transmitters, receivers and signal reflectors are moving. The invention's modulation methods detect locations and speeds of various reflectors and other channel impairments. Error detection schemes, variation of modulation methods, and MIMO techniques further detect and compensate for impairments. The invention can automatically optimize its operational parameters, and produce a deterministic non-fading signal in environments in which other methods would likely degrade.

Classes IPC  ?

• H04L 27/26 - Systèmes utilisant des codes à fréquences multiples
• H04B 7/10 - Diversité de polarisationDiversité de direction
• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission
• H04L 25/02 - Systèmes à bande de base Détails
• H04W 24/02 - Dispositions pour optimiser l'état de fonctionnement
• H04W 72/54 - Critères d’affectation ou de planification des ressources sans fil sur la base de critères de qualité

Abrégé

Methods, systems and devices for wireless communication, which include localization and auto-calibration, are described. One example method includes receiving, at a wireless device, signal transmissions from one or more network devices, and generating, by processing the signal transmissions, a feedback signal for antenna calibration of the one or more network devices. In some embodiments, the antenna calibration is used for performing device localization and feature map generation that is subsequently used for scheduling transmissions in a wireless network.

Classes IPC  ?

• H04B 7/0456 - Sélection de matrices de pré-codage ou de livres de codes, p. ex. utilisant des matrices pour pondérer des antennes
• H04B 7/06 - Systèmes de diversitéSystèmes à plusieurs antennes, c.-à-d. émission ou réception utilisant plusieurs antennes utilisant plusieurs antennes indépendantes espacées à la station d'émission

Abrégé

Methods, systems, and devices for operating a wireless communication network are described. One example method includes configuring a multi-user multi-input multi-output (MU-MIMO) control function in a wireless network comprising multiple network functions, where the MU-MIMO control function provides an MU-MIMO capability to the wireless network using which the wireless network provides wireless connectivity to user devices using an MU-MIMO configuration.

Classes IPC  ?

• H04W 72/54 - Critères d’affectation ou de planification des ressources sans fil sur la base de critères de qualité
• H04B 7/0413 - Systèmes MIMO
• H04W 24/10 - Planification des comptes-rendus de mesures
• H04W 84/04 - Réseaux à grande échelleRéseaux fortement hiérarchisés

Classes IPC  ?

• H04B 7/0413 - Systèmes MIMO
• H04W 24/10 - Planification des comptes-rendus de mesures
• H04W 72/54 - Critères d’affectation ou de planification des ressources sans fil sur la base de critères de qualité
• H04W 84/04 - Réseaux à grande échelleRéseaux fortement hiérarchisés

Abrégé

Methods, apparatus and systems for wireless communication are described. One example method includes estimating, based on channel quality information for a first communication channel during a first time interval, a predicted quality of a second communication channel during a second time interval that is a latency interval after the first time interval and using the predicted quality for processing transmissions on the second communication channel during the second time interval.

Classes IPC  ?

• H04B 17/373 - Prédiction des paramètres de qualité d’un canal
• H04L 25/02 - Systèmes à bande de base Détails

Abrégé

An Orthogonal Time Frequency Space Modulation (OTFS) modulation scheme achieving multiple access by multiplexing multiple signals at the transmitter-side performs allocation of transmission resources to a first signal and a second signal, combining and converting to a transmission format via OTFS modulation and transmitting the signal over a communication channel. At the receiver, multiplexed signals are recovered using orthogonality property of the basis functions used for the multiplexing at the transmitter.

Classes IPC  ?

• H04L 1/00 - Dispositions pour détecter ou empêcher les erreurs dans l'information reçue
• H04B 7/06 - Systèmes de diversitéSystèmes à plusieurs antennes, c.-à-d. émission ou réception utilisant plusieurs antennes utilisant plusieurs antennes indépendantes espacées à la station d'émission
• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission
• H04L 25/03 - Réseaux de mise en forme pour émetteur ou récepteur, p. ex. réseaux de mise en forme adaptatifs
• H04L 27/26 - Systèmes utilisant des codes à fréquences multiples

Abrégé

A wireless communication device includes a feed port comprising multiple input feeds, a precoding subsystem that is electrically connected to the feed port; and an antenna subsystem electrically connected to the precoding subsystem. The antenna subsystem is configured to transmit an output signal of the precoding subsystem to multiple wireless stations using multiple beams. The precoding subsystem is configured to perform a precoding operation on an input signal from the feed port, wherein the precoding operation maximizes a desired signal level to interference ratio of transmissions to the multiple wireless stations.

Classes IPC  ?

• H04B 7/0456 - Sélection de matrices de pré-codage ou de livres de codes, p. ex. utilisant des matrices pour pondérer des antennes
• H04B 7/0408 - Systèmes de diversitéSystèmes à plusieurs antennes, c.-à-d. émission ou réception utilisant plusieurs antennes utilisant plusieurs antennes indépendantes espacées utilisant plusieurs faisceaux, c.-à-d. diversité de faisceaux
• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission
• H04L 5/14 - Fonctionnement à double voie utilisant le même type de signal, c.-à-d. duplex

Abrégé

Methods and systems for orthogonal time frequency space (OTFS) communication using predefined basis signals are described. An example digital communication method includes receiving a signal over a communication channel, determining an estimate of the communication channel from one or more pilot symbols in the signal transmission. Herein the one or more pilot symbols are assigned along a delay-Doppler resource grid. The method further includes equalizing non-pilot symbols in the signal transmission by rotating the estimate of the communication channel according to grid locations of the one or more pilot symbols along the delay-Doppler resource grid at other grid locations, and recovering data bits from the equalized non-pilot symbols.

Classes IPC  ?

• H04L 25/03 - Réseaux de mise en forme pour émetteur ou récepteur, p. ex. réseaux de mise en forme adaptatifs
• H04L 27/26 - Systèmes utilisant des codes à fréquences multiples
• H04L 1/20 - Dispositions pour détecter ou empêcher les erreurs dans l'information reçue en utilisant un détecteur de la qualité du signal
• H04B 7/06 - Systèmes de diversitéSystèmes à plusieurs antennes, c.-à-d. émission ou réception utilisant plusieurs antennes utilisant plusieurs antennes indépendantes espacées à la station d'émission
• H04L 25/02 - Systèmes à bande de base Détails
• H04B 7/005 - Commande de la transmissionÉgalisation

Abrégé

Methods, systems and devices for distributed cooperative operation of wireless cells based on sparse channel representations are described. One example method includes providing, using a server, seamless wireless connectivity in an area in which a plurality of network nodes are organized as clusters, where each network node is configured to provide wireless connectivity via N angular sectors covering a surrounding area, where N is an integer and wherein angular sectors of the plurality of network nodes collectively cover the area; controlling, by the server, network nodes in a cluster to collect channel condition information for the N angular sectors and communicate the channel condition information to the network-side server, and operating the server to use the channel condition information collected from the network nodes in the cluster to control communication for the network nodes in the cluster at a different time or a different frequency or a different spatial direction.

Classes IPC  ?

• H04W 28/16 - Gestion centrale des ressourcesNégociation de ressources ou de paramètres de communication, p. ex. négociation de la bande passante ou de la qualité de service [QoS Quality of Service]
• H04W 16/24 - Structures des cellules
• H04W 72/044 - Affectation de ressources sans fil sur la base du type de ressources affectées
• H04W 72/542 - Critères d’affectation ou de planification des ressources sans fil sur la base de critères de qualité en utilisant la qualité mesurée ou perçue

Abrégé

Methods, systems and devices for wireless communication are described. One example method includes performing a first mapping in which information bits are mapped to transmission resources in a first portion of a two-dimensional delay-Doppler grid. Herein, the two-dimensional delay-Doppler grid comprises N Doppler elements and M delay elements, where N and M are positive integers. The method further includes performing a second mapping in which a reference signal is mapped to transmission resources in a second portion of the two-dimensional delay-Doppler grid, and generating a transmission waveform from a signal combination of an output of the first mapping and an output of the second mapping. The transmission waveform corresponds to an output of an orthogonal time frequency space (OTFS) waveform of the signal combination, and at least the output of the second mapping undergoes a time domain spreading.

Classes IPC  ?

• H04L 27/26 - Systèmes utilisant des codes à fréquences multiples

Abrégé

A method for modulating data for transmission within a communication system. The method includes establishing a time-frequency shifting matrix of dimension N×N, wherein N is greater than one. The method further includes combining the time-frequency shifting matrix with a data frame to provide an intermediate data frame. A transformed data matrix is provided by permuting elements of the intermediate data frame. A modulated signal is generated in accordance with elements of the transformed data matrix.

Classes IPC  ?

• H04L 27/26 - Systèmes utilisant des codes à fréquences multiples
• H04B 7/005 - Commande de la transmissionÉgalisation
• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission
• H04L 27/01 - Égaliseurs
• H04L 27/10 - Systèmes à courant porteur à modulation de fréquence, p. ex. utilisant une manipulation à décalage de fréquence
• H04L 23/02 - Appareils ou circuits locaux pour systèmes télégraphiques autres que ceux couverts par les groupes adaptés pour la signalisation orthogonale
• H04L 25/03 - Réseaux de mise en forme pour émetteur ou récepteur, p. ex. réseaux de mise en forme adaptatifs

Abrégé

A wireless communication method includes receiving, by a first wireless device during a training phase, reference tones using a first number of resource elements from a transmitter of a second wireless device, wherein the first wireless device comprises multiple receiving antennas, estimating, by the first wireless device, from the receiving the reference tones, a second order statistics of wireless channels between the multiple receiving antennas and the transmitter of the second wireless device, and performing channel estimation, during an operational phase subsequent to the training phase, using the second order statistics and reference tones received on a second number of resource elements, wherein the second number is less than the first number.

Classes IPC  ?

• H04L 25/02 - Systèmes à bande de base Détails
• H04B 7/0413 - Systèmes MIMO
• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission

Abrégé

Methods, systems and devices for wireless communication are described. One example method includes mapping information bits to transmission resources in a two-dimensional delay-Doppler grid In this example, the two-dimensional delay-Doppler grid includes N Doppler elements along a Doppler dimension and M delay elements along a delay dimension, and N and M are positive integers. The example method continues with converting a result of the mapping to a signal waveform, and generating an orthogonal time frequency space (OTFS) waveform by spreading the signal waveform using a spreading scheme. In some examples, the signal waveform includes an ultra-wide band (UWB) waveform.

Classes IPC  ?

• H04L 27/26 - Systèmes utilisant des codes à fréquences multiples
• H04L 27/10 - Systèmes à courant porteur à modulation de fréquence, p. ex. utilisant une manipulation à décalage de fréquence

Abrégé

Methods, systems and devices for wireless communication are described. One method includes obtaining a two-dimensional delay-Doppler representation of a received wireless signal that is received over a wireless channel, determining an estimated channel response of the wireless channel from a portion of the delay-Doppler grid corresponding to a channel estimation portion, performing, using the estimated channel response, channel equalization in the delay-Doppler domain, generating, based on the channel equalization, a posteriori probability estimates of data symbols in the received wireless signal, wherein the a posteriori probability estimates are generated based on a priori feedback that is generated using an iterative process and further processing the a posteriori probability estimates of data symbols to recover information bits from the received wireless signal.

Classes IPC  ?

• H04L 25/02 - Systèmes à bande de base Détails
• H04L 25/03 - Réseaux de mise en forme pour émetteur ou récepteur, p. ex. réseaux de mise en forme adaptatifs
• H04L 27/26 - Systèmes utilisant des codes à fréquences multiples

Abrégé

Orthogonal Time Frequency Space (OTFS) is a novel modulation scheme with significant benefits for 5G systems. The fundamental theory behind OTFS is presented in this paper as well as its benefits. We start with a mathematical description of the doubly fading delay-Doppler channel and develop a modulation that is tailored to this channel. We model the time varying delay-Doppler channel in the time-frequency domain and derive a new domain (the OTFS domain) where we show that the channel is transformed to a time invariant one and all symbols see the same SNR. We explore aspects of the modulation like delay and Doppler resolution, and address design and implementation issues like multiplexing multiple users and evaluating complexity. Finally we present some performance results where we demonstrate the superiority of OTFS.

Classes IPC  ?

• H04L 27/32 - Systèmes à courant porteur caractérisés par des combinaisons de plusieurs types de systèmes couverts par les groupes , , , ou

Abrégé

Techniques for wireless networking that include transmission and reception of signals using orthogonal time frequency space (OTFS) modulation techniques are disclosed. For example, a wireless access point may communicate with a station using OFDM modulated WiFi (OFDM-WiFi) at one time and using OTFS modulated WiFi (OTFS-WiFi) at another time. The OTFS-WiFi may provide improved throughput and coverage over OFDM-WiFi in static and mobile environments.

Classes IPC  ?

• H04W 4/80 - Services utilisant la communication de courte portée, p. ex. la communication en champ proche, l'identification par radiofréquence ou la communication à faible consommation d’énergie
• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission

Abrégé

An airborne device carrying an RF-head platform is disclosed. The device includes one or more antennas configured to transmit (Tx) wireless signals to and receive (Rx) wireless signals from a baseband unit of a ground station by at least one laser communications link and one or more RF heads coupled to the one or more antennas. A respective RF head may be configured to convert Rx RF signals received from at least one user equipment (UE) into Rx digitized-waveform data, to transmit the Rx digitized-waveform data to the baseband unit of the ground station over the at least one laser communications link, to convert Tx digitized-waveform data received from the baseband unit of the ground station over the at least one laser communications link into Tx RF signals, and to transmit the Tx RF signals to the at least one UE.

Classes IPC  ?

• H04B 7/06 - Systèmes de diversitéSystèmes à plusieurs antennes, c.-à-d. émission ou réception utilisant plusieurs antennes utilisant plusieurs antennes indépendantes espacées à la station d'émission
• B64B 1/40 - Ballons
• B64C 39/02 - Aéronefs non prévus ailleurs caractérisés par un emploi spécial
• H04B 7/155 - Stations terrestres
• H04B 7/185 - Stations spatiales ou aériennes
• H04W 88/08 - Dispositifs formant point d'accès
• B64U 10/30 - Aéronefs plus légers que l’air, p. ex. véhicules aérostatiques
• B64U 50/34 - Chargement en vol
• B64U 101/20 - Véhicules aériens sans pilote spécialement adaptés à des utilisations ou à des applications spécifiques à l’utilisation en tant que relais de communication, p. ex. plates-formes de haute altitude

Abrégé

Device, methods, and systems for implementing aspects of orthogonal time frequency space (OTFS) modulation in wireless systems are described. In an aspect, the device may include a surface of an object for receiving an electromagnetic signal. The surface may be structured to perform a non-electrical function for the object. The surface may generate an electrical signal from an electromagnetic signal. The electromagnetic signal may be received from a transmitter. The transmitter may map digital data to a digital amplitude modulation constellation in a time-frequency space. The digital amplitude modulation constellation may be mapped to a delay-Doppler domain and the transmitter may transmit to the surface according to an orthogonal time frequency space modulation signal scheme. The apparatus may further include a demodulator to demodulate the electrical signal to determine digital data.

Classes IPC  ?

• H04L 27/26 - Systèmes utilisant des codes à fréquences multiples
• H04B 1/3827 - Émetteurs-récepteurs portatifs
• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission
• H04L 27/00 - Systèmes à porteuse modulée
• H04L 27/20 - Circuits de modulationCircuits émetteurs

Abrégé

A method of wireless communication includes performing a first measurement of a wavefront received at a first antenna of a base station configured to provide a wireless communication access to user devices in a coverage area, performing a second measurement of the wavefront received at a second antenna of the base station, wherein the first antenna and the second antenna are separated by a separation distance along a direction, deriving a compensation factor from the first measurement and the second measurement, wherein the compensation factor is used for estimating an estimated angle of arrival (AOA) and performing the subsequent communication by applying the compensation factor to an outgoing or an incoming signal waveform to or from a user device.

Classes IPC  ?

• G01S 7/40 - Moyens de contrôle ou d'étalonnage
• G01S 1/14 - Systèmes pour déterminer une direction ou une ligne de position utilisant la comparaison d'amplitude de signaux transmis simultanément à partir d'antennes ou de systèmes d'antennes ayant des caractéristiques directionnelles de recouvrement orientées différemment
• G01S 1/02 - Radiophares ou systèmes de balisage émettant des signaux ayant une ou des caractéristiques pouvant être détectées par des récepteurs non directionnels et définissant des directions, situations ou lignes de position déterminées par rapport aux émetteurs de radiophareRécepteurs travaillant avec ces systèmes utilisant les ondes radioélectriques
• G01S 3/16 - Systèmes pour déterminer une direction ou une déviation par rapport à une direction prédéterminée utilisant une comparaison d'amplitude de signaux provenant successivement d'antennes ou de systèmes d'antennes réceptrices ayant des caractéristiques de directivité différemment orientées ou d'un système d'antenne ayant une caractéristique de directivité à orientation variant périodiquement
• H01Q 3/00 - Dispositifs pour changer ou faire varier l'orientation ou la forme du diagramme de directivité des ondes rayonnées par une antenne ou un système d'antenne
• H04B 7/08 - Systèmes de diversitéSystèmes à plusieurs antennes, c.-à-d. émission ou réception utilisant plusieurs antennes utilisant plusieurs antennes indépendantes espacées à la station de réception

Abrégé

Methods, systems, and devices for spectral sharing wireless systems, wherein multiple user devices share time and frequency resources for uplink and/or downlink transmissions, are described. One example wireless communication system includes a network station, and multiple user devices, wherein data transmissions over the same time and frequency resources are shared between multiple user devices, in downlink and/or uplink, using spatial user device separation that is dynamically computed by the network station, and where the network station derives spatial user device separation based on uplink channel measurements.

Classes IPC  ?

• H04W 72/121 - Planification du trafic sans fil pour les groupes de terminaux ou d’utilisateurs
• H04B 7/0456 - Sélection de matrices de pré-codage ou de livres de codes, p. ex. utilisant des matrices pour pondérer des antennes
• H04L 5/14 - Fonctionnement à double voie utilisant le même type de signal, c.-à-d. duplex
• H04W 72/542 - Critères d’affectation ou de planification des ressources sans fil sur la base de critères de qualité en utilisant la qualité mesurée ou perçue

Abrégé

A method of wireless communication performed by a base station includes grouping a plurality of wireless devices associated with a coverage area of the base station into multiple spatial groups, and configuring the wireless devices in each spatial group to use overlapping time-frequency transmission resources for uplink (UL) data transmissions to the base station. The method also includes scheduling, on a same set of time-frequency transmission resources, demodulation reference signal (DMRS) transmissions by the wireless devices in a respective spatial group of the multiple spatial groups. In various aspects, the multiple spatial groups are determined based on respective estimated angles of arrival of the plurality of wireless devices associated with the coverage area of the base station. In some instances, each of the wireless devices in the respective spatial group uses the same antenna ports as the other wireless devices in the respective spatial group for the DMRS transmissions.

Classes IPC  ?

• H04B 7/04 - Systèmes de diversitéSystèmes à plusieurs antennes, c.-à-d. émission ou réception utilisant plusieurs antennes utilisant plusieurs antennes indépendantes espacées
• H04J 1/00 - Systèmes multiplex à division de fréquence
• H04L 27/26 - Systèmes utilisant des codes à fréquences multiples
• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission
• H04W 72/04 - Affectation de ressources sans fil

Abrégé

Methods, systems and devices for spatial multiplexing of different radio technologies are described. An example method for wireless communication includes configuring abase station of a fifth generation new radio (5G NR) radio technology cell to perform transmissions in a network according to a set of compatibility rules that allow a backward compatible operation of the base station with a 4th generation Long Term Evolution (4G LTE) radio technology, and performing transmissions or receptions in the 5G NR cell according to the configuring such that the backward compatible operation is achieved based on orthogonality in a spatial domain between transmissions or receptions in the 5G NR cell and the 4G LTE radio technology.

Classes IPC  ?

• H04B 7/06 - Systèmes de diversitéSystèmes à plusieurs antennes, c.-à-d. émission ou réception utilisant plusieurs antennes utilisant plusieurs antennes indépendantes espacées à la station d'émission
• H04B 7/0456 - Sélection de matrices de pré-codage ou de livres de codes, p. ex. utilisant des matrices pour pondérer des antennes
• H04L 27/26 - Systèmes utilisant des codes à fréquences multiples

Abrégé

A method for modulating data for transmission within a communication system. The method includes establishing a time-frequency shifting matrix of dimension N×N, wherein N is greater than one. The method further includes combining the time-frequency shifting matrix with a data frame to provide an intermediate data frame. A transformed data matrix is provided by permuting elements of the intermediate data frame. A modulated signal is generated in accordance with elements of the transformed data matrix.

Classes IPC  ?

• H04L 27/26 - Systèmes utilisant des codes à fréquences multiples
• H04B 7/005 - Commande de la transmissionÉgalisation
• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission
• H04L 27/01 - Égaliseurs
• H04L 27/10 - Systèmes à courant porteur à modulation de fréquence, p. ex. utilisant une manipulation à décalage de fréquence
• H04L 23/02 - Appareils ou circuits locaux pour systèmes télégraphiques autres que ceux couverts par les groupes adaptés pour la signalisation orthogonale
• H04L 25/03 - Réseaux de mise en forme pour émetteur ou récepteur, p. ex. réseaux de mise en forme adaptatifs

Abrégé

A wireless communication method includes determining, by a network device, uplink power allocations assigned to each user device of multiple user devices; estimating a channel response for each user device of multiple user devices based on a corresponding uplink reference signal transmission received from the each user device; computing, for the each user device, a covariance matrix based on a corresponding channel response, determining a maximum eigenvector of an uplink signal to interference and noise ratio (SINR) matrix for the each user device; computing, from the uplink SINR matrix, a downlink cross-interference matrix for the each user device; selecting, from the downlink cross-interference matrix for the each user device, a selected vector that maximizes a selected criterion for the each user device; and determining, from the selected vectors of the multiple user devices, a downlink power allocation for the each user device of multiple user devices.

Classes IPC  ?

• H04B 7/0456 - Sélection de matrices de pré-codage ou de livres de codes, p. ex. utilisant des matrices pour pondérer des antennes
• H04B 7/024 - Utilisation coopérative d’antennes sur plusieurs sites, p. ex. dans les systèmes à plusieurs points coordonnés ou dans les systèmes coopératifs à "plusieurs entrées plusieurs sorties" [MIMO]
• H04B 7/0452 - Systèmes MIMO à plusieurs utilisateurs
• H04W 52/14 - Analyse séparée de la liaison montante ou de la liaison descendante

Abrégé

Methods, systems and devices for wireless communication are described. One example method includes performing, by a network device, gain, phase and timing imbalance calibrations of multiple wireless devices in a wireless network, estimating, by the network device, angles of arrivals of the multiple wireless devices, determining wireless device grouping based on geometric properties including angels of arrivals of the multiple wireless devices, scheduling data collection from the multiple wireless devices based on the geometric properties, and simultaneously scheduling groups of wireless devices from the multiple wireless devices for data transmission or reception based on the grouping.

Classes IPC  ?

• H04B 7/06 - Systèmes de diversitéSystèmes à plusieurs antennes, c.-à-d. émission ou réception utilisant plusieurs antennes utilisant plusieurs antennes indépendantes espacées à la station d'émission
• H04W 74/04 - Accès planifié
• H04B 7/04 - Systèmes de diversitéSystèmes à plusieurs antennes, c.-à-d. émission ou réception utilisant plusieurs antennes utilisant plusieurs antennes indépendantes espacées

Abrégé

Methods, devices, and systems for communication techniques that use the quasi-static properties of wireless channels are described. One example method to improve communication performance includes receiving a set of pilots over a transmission channel between the wireless communication apparatus and a far-end communication apparatus, the transmission channel comprising a first portion that is time-invariant and a second portion that is time-variant, processing the received set of pilots to generate an estimate of the first portion, processing the received set of pilots to generate an estimate of the second portion, and performing a communication based on a channel state information that is a weighted combination of a first term based on the estimate of the first portion and a second term based on the estimate of the second portion.

Classes IPC  ?

• H04W 72/542 - Critères d’affectation ou de planification des ressources sans fil sur la base de critères de qualité en utilisant la qualité mesurée ou perçue
• H04B 17/309 - Mesure ou estimation des paramètres de qualité d’un canal
• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission
• H04L 25/02 - Systèmes à bande de base Détails
• H04W 72/566 - Critères d’affectation ou de planification des ressources sans fil sur la base de critères de priorité de l’information, de la source d’information ou du destinataire

Abrégé

Fiber, cable, and wireless data channels are typically impaired by reflectors and other imperfections, producing a channel state with echoes and frequency shifts in data waveforms. Here, methods of using pilot symbol waveform bursts to automatically produce a detailed 2D model of the channel state are presented. This 2D channel state can then be used to optimize data transmission. For wireless data channels, an even more detailed 2D model of channel state can be produced by using polarization and multiple antennas in the process. Once 2D channel states are known, the system turns imperfect data channels from a liability to an advantage by using channel imperfections to boost data transmission rates. The methods can be used to improve legacy data transmission modes in multiple types of media, and are particularly useful for producing new types of robust and high capacity wireless communications using non-legacy data transmission methods as well.

Classes IPC  ?

• H04L 25/02 - Systèmes à bande de base Détails
• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission
• H04L 27/26 - Systèmes utilisant des codes à fréquences multiples
• H04W 24/02 - Dispositions pour optimiser l'état de fonctionnement
• H04W 72/54 - Critères d’affectation ou de planification des ressources sans fil sur la base de critères de qualité
• H04B 7/10 - Diversité de polarisationDiversité de direction

Abrégé

Methods, systems and devices for wireless communication are described. An example method for wireless communication includes controlling a sweep of channel estimation transmissions across a two-dimensional antenna array comprising N horizontal antennas and M vertical antennas according to an operational condition in a wireless communication network. In one example, a pattern used for the sweep sweeps across horizontal antennas followed by a sweep across vertical antennas. In another example, a pattern used for the sweep sweeps across vertical antennas followed by a sweep across horizontal antennas.

Classes IPC  ?

• H04B 7/06 - Systèmes de diversitéSystèmes à plusieurs antennes, c.-à-d. émission ou réception utilisant plusieurs antennes utilisant plusieurs antennes indépendantes espacées à la station d'émission
• H04B 7/0413 - Systèmes MIMO
• H04W 24/08 - Réalisation de tests en trafic réel
• H04B 7/0417 - Systèmes de rétroaction
• H04L 27/26 - Systèmes utilisant des codes à fréquences multiples

Abrégé

Methods, systems and devices for wireless communication, which include localization and auto-calibration, are described. One example method includes receiving, at a wireless device, signal transmissions from one or more network devices, and generating, by processing the signal transmissions, a feedback signal for antenna calibration of the one or more network devices. In some embodiments, the antenna calibration is used for performing device localization and feature map generation that is subsequently used for scheduling transmissions in a wireless network.

Classes IPC  ?

• H04B 7/0456 - Sélection de matrices de pré-codage ou de livres de codes, p. ex. utilisant des matrices pour pondérer des antennes
• H04B 7/06 - Systèmes de diversitéSystèmes à plusieurs antennes, c.-à-d. émission ou réception utilisant plusieurs antennes utilisant plusieurs antennes indépendantes espacées à la station d'émission

Abrégé

Methods, systems and devices for wireless communication are described. One example method includes determining, using resources in a wireless network, a schedule of transmissions between the wireless network and one or more user devices, and controlling the transmissions according to the schedule. The resources are distributed between a central unit (CU) and a distributed unit (DU) according to a resource partitioning scheme. The DU is configured to handle a first set of protocol layers of a communication protocol stack implemented in the wireless network according to a layer partitioning scheme and the CU is configured to handle a second set of protocol layers of the communication protocol stack according to the layer partitioning scheme. The first set of protocol layers excludes an upper medium access control (MAC) layer. The second set of protocol layers excludes a physical layer.

Classes IPC  ?

• H04L 1/00 - Dispositions pour détecter ou empêcher les erreurs dans l'information reçue
• H04L 1/1812 - Protocoles hybridesDemande de retransmission automatique hybride [HARQ]
• H04L 1/08 - Dispositions pour détecter ou empêcher les erreurs dans l'information reçue par émission répétée, p. ex. système Verdan
• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission

Abrégé

A fixed wireless access system is implemented using orthogonal time frequency space multiplexing (OTFS). Data transmissions to/from different devices share transmission resources using—delay Doppler multiplexing, time-frequency multiplexing, multiplexing at stream and/or layer level, and angular multiplexing. Time-frequency multiplexing is achieved by dividing the time-frequency plan into subgrids, with the subsampled time frequency grid being used to carry the OTFS data. Antenna implementations include a hemispherical antenna with multiple antenna elements arranged in an array to achieve multiplexing.

Classes IPC  ?

• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission
• H01Q 21/24 - Combinaisons d'unités d'antennes polarisées dans des directions différentes pour émettre ou recevoir des ondes polarisées circulairement ou elliptiquement ou des ondes polarisées linéairement dans n'importe quelle direction
• H04B 7/06 - Systèmes de diversitéSystèmes à plusieurs antennes, c.-à-d. émission ou réception utilisant plusieurs antennes utilisant plusieurs antennes indépendantes espacées à la station d'émission
• H04B 7/12 - Diversité de fréquence

Abrégé

Wireless communication transmission and reception techniques are described. At transmitter, source data bits are modulated into a number Nd of constellation symbols. An invertible transform is applied to the constellation symbols, thereby resulting in mapping the transformed symbols into Nd elements in the time-frequency grid. A signal resulting from the invertible transform is transmitted over a communication channel.

Classes IPC  ?

• H04L 27/26 - Systèmes utilisant des codes à fréquences multiples
• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission
• H04L 25/03 - Réseaux de mise en forme pour émetteur ou récepteur, p. ex. réseaux de mise en forme adaptatifs

Abrégé

Computerized wireless transmitter/receiver system that automatically uses combinations of various methods, including transmitting data symbols by weighing or modulating a family of time shifted and frequency shifted waveforms bursts, pilot symbol methods, error detection methods, MIMO methods, and other methods, to automatically determine the structure of a data channel, and automatically compensate for signal distortions caused by various structural aspects of the data channel, as well as changes in channel structure. Often the data channel is a two or three dimensional space in which various wireless transmitters, receivers and signal reflectors are moving. The invention's modulation methods detect locations and speeds of various reflectors and other channel impairments. Error detection schemes, variation of modulation methods, and MIMO techniques further detect and compensate for impairments. The invention can automatically optimize its operational parameters, and produce a deterministic non-fading signal in environments in which other methods would likely degrade.

Classes IPC  ?

• H04L 27/26 - Systèmes utilisant des codes à fréquences multiples
• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission
• H04L 25/02 - Systèmes à bande de base Détails
• H04W 24/02 - Dispositions pour optimiser l'état de fonctionnement
• H04W 72/54 - Critères d’affectation ou de planification des ressources sans fil sur la base de critères de qualité
• H04B 7/10 - Diversité de polarisationDiversité de direction

Abrégé

An airborne RF-head platform system and method. Here, much of the computational burden of transmitting and receiving wireless RF waveforms is shifted from the airborne platform to a ground baseband unit (BBU). The airborne platform, which will often be a high altitude balloon or drone type platform, generally comprises one or more remote radio heads, configured with antennas, A/D and D/A converters, frequency converters, RF amplifiers, and the like. The airborne platform communicates with the ground baseband units either directly via a laser communications link, or indirectly through another airborne relay platform. The airborne RF-head communicates via various wireless protocols to various user equipment such as smartphones by using the BBU and the laser communications link to precisely control the function of the airborne A/D and D/A converters and antennas. This system reduces the power needs, weight, and cost of the airborne platform, and also improves operational flexibility.

Classes IPC  ?

• H04B 7/06 - Systèmes de diversitéSystèmes à plusieurs antennes, c.-à-d. émission ou réception utilisant plusieurs antennes utilisant plusieurs antennes indépendantes espacées à la station d'émission
• H04B 7/155 - Stations terrestres
• H04B 7/185 - Stations spatiales ou aériennes
• B64C 39/02 - Aéronefs non prévus ailleurs caractérisés par un emploi spécial
• B64B 1/40 - Ballons
• H04W 88/08 - Dispositifs formant point d'accès
• B64U 10/13 - Plates-formes volantes

Abrégé

Methods, systems and devices for wireless communication are described. One example method includes performing a first mapping in which information bits are mapped to transmission resources in a first portion of a two-dimensional delay-Doppler grid. Herein, the two-dimensional delay-Doppler grid comprises N Doppler elements and M delay elements, where N and M are positive integers. The method further includes performing a second mapping in which a reference signal is mapped to transmission resources in a second portion of the two-dimensional delay-Doppler grid, and generating a transmission waveform from a signal combination of an output of the first mapping and an output of the second mapping. The transmission waveform corresponds to an output of an orthogonal time frequency space (OTFS) waveform of the signal combination, and at least the output of the second mapping undergoes a time domain spreading.

Classes IPC  ?

• H04L 27/26 - Systèmes utilisant des codes à fréquences multiples
• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission

Abrégé

Methods, apparatus and systems for wireless communication are described. One example method includes estimating, based on channel quality information for a first communication channel during a first time interval, a predicted quality of a second communication channel during a second time interval that is a latency interval after the first time interval and using the predicted quality for processing transmissions on the second communication channel during the second time interval.

Classes IPC  ?

• H04B 17/373 - Prédiction des paramètres de qualité d’un canal
• H04L 25/02 - Systèmes à bande de base Détails

Abrégé

Techniques for performing channel estimation in an orthogonal time, frequency and space (OTFS) communication system include receiving a wireless signal comprising a data signal portion and a pilot signal portion in which the pilot signal portion includes multiple pilot signals multiplexed together in the OTFS domain, performing two-dimensional channel estimation in a time-frequency domain based on a minimum mean square error (MMSE) optimization criterion, and recovering information bits using a channel estimate obtained from the two-dimensional channel estimation.

Classes IPC  ?

• H04L 25/02 - Systèmes à bande de base Détails
• H04B 7/005 - Commande de la transmissionÉgalisation
• H04B 17/309 - Mesure ou estimation des paramètres de qualité d’un canal
• H04B 17/373 - Prédiction des paramètres de qualité d’un canal
• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission
• H04L 27/01 - Égaliseurs
• H04L 27/26 - Systèmes utilisant des codes à fréquences multiples

Abrégé

Methods, systems and devices for providing transmission resources that achieve transmission diversity while reducing pilot signal overhead are described. An exemplary wireless communication method may be implemented in a wireless communication system in which transmission resources are allocated on a per physical resource block (PRB) basis, where a PRB corresponds to a two dimensional resource pattern comprising a first number of subcarriers along a frequency dimension and a second number time slots along a time dimension. The method includes logically dividing subcarriers in each PRB into an integer number of sub-groups of sub-carriers, wherein the integer number is greater than one, allocating, to a transmission, transmission resources corresponding to one or more of the sub-groups of subcarriers, performing the transmission in the wireless communication system.

Classes IPC  ?

• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission
• H04W 72/53 - Critères d’affectation ou de planification des ressources sans fil sur la base de politiques d’affectation réglementaires
• H04W 72/0446 - Ressources du domaine temporel, p. ex. créneaux ou trames
• H04W 72/0453 - Ressources du domaine fréquentiel, p. ex. porteuses dans des AMDF [FDMA]

Abrégé

An airborne RF-head platform system and method. Here, much of the computational burden of transmitting and receiving wireless RF waveforms is shifted from the airborne platform to a ground baseband unit (BBU). The airborne platform, which will often be a high altitude balloon or drone type platform, generally comprises one or more remote radio heads, configured with antennas, A/D and D/A converters, frequency converters, RF amplifiers, and the like. The airborne platform communicates with the ground baseband units either directly via a laser communications link, or indirectly through another airborne relay platform. The airborne RF-head communicates via various wireless protocols to various user equipment such as smartphones by using the BBU and the laser communications link to precisely control the function of the airborne A/D and D/A converters and antennas. This system reduces the power needs, weight, and cost of the airborne platform, and also improves operational flexibility.

Classes IPC  ?

• H04B 7/06 - Systèmes de diversitéSystèmes à plusieurs antennes, c.-à-d. émission ou réception utilisant plusieurs antennes utilisant plusieurs antennes indépendantes espacées à la station d'émission
• H04B 7/155 - Stations terrestres
• H04B 7/185 - Stations spatiales ou aériennes
• B64C 39/02 - Aéronefs non prévus ailleurs caractérisés par un emploi spécial
• B64B 1/40 - Ballons
• H04W 88/08 - Dispositifs formant point d'accès

Abrégé

Co-existence between an Orthogonal Time Frequency Space (OTFS) modulation system and a Long Term Evolution (LTE) system is achieved by generating a number of transmission beams for a first group of user equipment operating using LTE, and a second group of user equipment operating using the OTFS protocol, and transmitting a first group of data packets formatted according to the LTE protocol to the first group of user equipment and a second group of data packets formatted according to the OTFS protocol to the second group of user equipment. The transmissions are performed by precoding and modulating the first group of data packets according to an LTE modulation scheme, and precoding and modulating the second group of data packets according to an OTFS modulation scheme.

Classes IPC  ?

• H04B 7/0413 - Systèmes MIMO
• H04B 7/0456 - Sélection de matrices de pré-codage ou de livres de codes, p. ex. utilisant des matrices pour pondérer des antennes
• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission
• H04L 27/26 - Systèmes utilisant des codes à fréquences multiples
• H04W 4/06 - Répartition sélective de services de diffusion, p. ex. service de diffusion/multidiffusion multimédiaServices à des groupes d’utilisateursServices d’appel sélectif unidirectionnel
• H04W 72/044 - Affectation de ressources sans fil sur la base du type de ressources affectées
• H04W 72/20 - Canaux de commande ou signalisation pour la gestion des ressources

Abrégé

A wireless communication device includes a feed port comprising multiple input feeds, a precoding subsystem that is electrically connected to the feed port; and an antenna subsystem electrically connected to the precoding subsystem. The antenna subsystem is configured to transmit an output signal of the precoding subsystem to multiple wireless stations using multiple beams. The precoding subsystem is configured to perform a precoding operation on an input signal from the feed port, wherein the precoding operation maximizes a desired signal level to interference ratio of transmissions to the multiple wireless stations.

Classes IPC  ?

• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission
• H04B 7/0408 - Systèmes de diversitéSystèmes à plusieurs antennes, c.-à-d. émission ou réception utilisant plusieurs antennes utilisant plusieurs antennes indépendantes espacées utilisant plusieurs faisceaux, c.-à-d. diversité de faisceaux
• H04B 7/0456 - Sélection de matrices de pré-codage ou de livres de codes, p. ex. utilisant des matrices pour pondérer des antennes
• H04L 5/14 - Fonctionnement à double voie utilisant le même type de signal, c.-à-d. duplex

Abrégé

Methods, systems and devices for wireless communication are described. One example method includes mapping information bits to transmission resources in a two-dimensional delay-Doppler grid In this example, the two-dimensional delay-Doppler grid includes N Doppler elements along a Doppler dimension and M delay elements along a delay dimension, and N and M are positive integers. The example method continues with converting a result of the mapping to a signal waveform, and generating an orthogonal time frequency space (OTFS) waveform by spreading the signal waveform using a spreading scheme. In some examples, the signal waveform includes an ultra-wide band (UWB) waveform.

Classes IPC  ?

• H04L 27/26 - Systèmes utilisant des codes à fréquences multiples
• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission

Abrégé

Methods, systems and devices for reciprocal geometric precoding are described. One example method includes determining, by a network device, an uplink channel state using reference signal transmissions received from multiple user devices, and generating a precoded transmission waveform for transmission to one or more of the multiple user devices by applying a precoding scheme that is based on the uplink channel state, wherein the uplink channel state completely defines the precoding scheme. In some embodiments, the reference signal transmissions and the precoded transmission waveform are multiplexed using either time-domain multiplexing or frequency-domain multiplexing.

Classes IPC  ?

• H04B 7/0456 - Sélection de matrices de pré-codage ou de livres de codes, p. ex. utilisant des matrices pour pondérer des antennes
• H04B 7/024 - Utilisation coopérative d’antennes sur plusieurs sites, p. ex. dans les systèmes à plusieurs points coordonnés ou dans les systèmes coopératifs à "plusieurs entrées plusieurs sorties" [MIMO]
• H04B 7/0452 - Systèmes MIMO à plusieurs utilisateurs
• H04W 52/14 - Analyse séparée de la liaison montante ou de la liaison descendante

Abrégé

Methods, systems and devices for wireless communication are described. One method includes obtaining a two-dimensional delay-Doppler representation of a received wireless signal that is received over a wireless channel, determining an estimated channel response of the wireless channel from a portion of the delay-Doppler grid corresponding to a channel estimation portion, performing, using the estimated channel response, channel equalization in the delay-Doppler domain, generating, based on the channel equalization, a posteriori probability estimates of data symbols in the received wireless signal, wherein the a posteriori probability estimates are generated based on a priori feedback that is generated using an iterative process and further processing the a posteriori probability estimates of data symbols to recover information bits from the received wireless signal.

Classes IPC  ?

• H04L 27/26 - Systèmes utilisant des codes à fréquences multiples
• H04L 25/02 - Systèmes à bande de base Détails

Abrégé

Methods, systems, and devices for spectral sharing wireless systems, wherein multiple user devices share time and frequency resources for uplink and/or downlink transmissions, are described. One example method includes transmitting transmission symbols from the network station to at least one user device by processing through a first precoder and a pre-compensation stage, wherein the pre-compensation stage is selected to have the transmission symbols receivable at the at least one user device to appear as if the transmission symbols are processed by a second precoder different from the first precoder.

Classes IPC  ?

• H04B 7/06 - Systèmes de diversitéSystèmes à plusieurs antennes, c.-à-d. émission ou réception utilisant plusieurs antennes utilisant plusieurs antennes indépendantes espacées à la station d'émission
• H04B 7/10 - Diversité de polarisationDiversité de direction
• H04L 5/14 - Fonctionnement à double voie utilisant le même type de signal, c.-à-d. duplex

Abrégé

A wireless communication method includes receiving, by a first wireless device during a training phase, reference tones using a first number of resource elements from a transmitter of a second wireless device, wherein the first wireless device comprises multiple receiving antennas, estimating, by the first wireless device, from the receiving the reference tones, a second order statistics of wireless channels between the multiple receiving antennas and the transmitter of the second wireless device, and performing channel estimation, during an operational phase subsequent to the training phase, using the second order statistics and reference tones received on a second number of resource elements, wherein the second number is less than the first number.

Classes IPC  ?

• H04L 25/02 - Systèmes à bande de base Détails
• H04B 7/0413 - Systèmes MIMO
• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission

Abrégé

Methods, systems and devices for fractional cooperative multipoint network operation are described. One example method for wireless communication includes determining, by a network device, a cooperative multipoint (COMP) management status of wireless devices served by the network device, and providing, by the network device, wireless connectivity to the one or more wireless devices, wherein the network device jointly manages transmission resources for a first wireless device due to the COMP management status being a joint COMP status and the network device locally manages transmission resources for a second wireless device due to the COMP management status being a local COMP status.

Classes IPC  ?

• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission
• H04B 7/0452 - Systèmes MIMO à plusieurs utilisateurs

Abrégé

Methods, systems and devices for spatial multiplexing of different radio technologies are described. An example method for wireless communication includes configuring a base station of a fifth generation new radio (5G NR) radio technology cell to perform transmissions in a network according to a set of compatibility rules that allow a backward compatible operation of the base station with a 4th generation Long Term Evolution (4G LTE) radio technology, and performing transmissions or receptions in the 5G NR cell according to the configuring such that the backward compatible operation is achieved based on orthogonality in a spatial domain between transmissions or receptions in the 5G NR cell and the 4G LTE radio technology.

Classes IPC  ?

• H04B 7/0452 - Systèmes MIMO à plusieurs utilisateurs
• H04B 7/06 - Systèmes de diversitéSystèmes à plusieurs antennes, c.-à-d. émission ou réception utilisant plusieurs antennes utilisant plusieurs antennes indépendantes espacées à la station d'émission
• H04J 11/00 - Systèmes multiplex orthogonaux
• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission
• H04L 27/26 - Systèmes utilisant des codes à fréquences multiples
• H04W 72/04 - Affectation de ressources sans fil

Abrégé

Methods, systems and devices for massive cooperative multipoint network operation are described. One example method for wireless communication includes transmitting, by a network node serving a plurality of mobile devices in a surrounding area, channel condition information and scheduling information for one or more of the plurality of mobile devices to a network-side server, receiving, by the network node from the network-side server, control information for scheduling transmissions to or from each of the one or more of the plurality of mobile devices, and controlling, by the network node and based on the control information, a communication to or from the one or more of the plurality of mobile devices at a future time or a different frequency band or a different spatial direction.

Classes IPC  ?

• H04B 7/024 - Utilisation coopérative d’antennes sur plusieurs sites, p. ex. dans les systèmes à plusieurs points coordonnés ou dans les systèmes coopératifs à "plusieurs entrées plusieurs sorties" [MIMO]
• H04W 36/08 - Resélection d'un point d'accès
• H04W 36/18 - Exécution d'une resélection à des fins spécifiques pour permettre une resélection sans coupure, p. ex. une resélection en douceur

Abrégé

Methods, systems and device for achieving synchronization in an orthogonal time frequency space (OTFS) signal receiver are described. An exemplary signal reception technique includes receiving an OTFS modulated wireless signal comprising pilot signal transmissions interspersed with data transmissions, calculating autocorrelation of the wireless signal using the wireless signal and a delayed version of the wireless signal that is delayed by a pre-determined delay, thereby generating an autocorrelation output, processing the autocorrelation filter through a moving average filter to produce a fine timing signal. Another exemplary signal reception technique includes receiving an OTFS modulated wireless signal comprising pilot signal transmissions interspersed with data transmissions, performing an initial automatic gain correction of the received OTFS wireless signal by peak detection and using clipping information, performing coarse automatic gain correction on results of a received and initial automatic gain control (AGC)-corrected signal.

Classes IPC  ?

• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission
• H04L 27/156 - Circuits de démodulationCircuits récepteurs avec démodulation utilisant les propriétés temporelles du signal reçu, p. ex. détectant la largeur de l'impulsion
• H04L 27/26 - Systèmes utilisant des codes à fréquences multiples
• H04W 52/52 - Commande de puissance d'émission [TPC Transmission power control] utilisant des circuits ou des amplificateurs de commande automatique de gain [AGC Automatic Gain Control]

Abrégé

Methods, devices and systems for communication techniques that use the quasi-static properties of wireless channels are described. One example method to improve communication performance includes receiving a set of pilots over a transmission channel between the wireless communication apparatus and a far-end communication apparatus, the transmission channel comprising a first portion that is time-invariant and a second portion that is time-variant, processing the received set of pilots to generate an estimate of the first portion, processing the received set of pilots to generate an estimate of the second portion, and performing a communication based on a channel state information that is a weighted combination of a first term based on the estimate of the first portion and a second term based on the estimate of the second portion.

Classes IPC  ?

• H04W 72/12 - Planification du trafic sans fil
• H04W 72/542 - Critères d’affectation ou de planification des ressources sans fil sur la base de critères de qualité en utilisant la qualité mesurée ou perçue
• H04B 17/309 - Mesure ou estimation des paramètres de qualité d’un canal
• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission
• H04L 25/02 - Systèmes à bande de base Détails
• H04W 72/566 - Critères d’affectation ou de planification des ressources sans fil sur la base de critères de priorité de l’information, de la source d’information ou du destinataire

Abrégé

Methods, systems and devices for wireless communication are described. One example method includes determining, using resources in a wireless network, a schedule of transmissions between the wireless network and one or more user devices, and controlling the transmissions according to the schedule. The resources are distributed between a central unit (CU) and a distributed unit (DU) according to a resource partitioning scheme. The DU is configured to handle a first set of protocol layers of a communication protocol stack implemented in the wireless network according to a layer partitioning scheme and the CU is configured to handle a second set of protocol layers of the communication protocol stack according to the layer partitioning scheme. The first set of protocol layers excludes an upper medium access control (MAC) layer. The second set of protocol layers excludes a physical layer.

Classes IPC  ?

• H04W 28/16 - Gestion centrale des ressourcesNégociation de ressources ou de paramètres de communication, p. ex. négociation de la bande passante ou de la qualité de service [QoS Quality of Service]
• H04B 7/0413 - Systèmes MIMO
• H04B 7/024 - Utilisation coopérative d’antennes sur plusieurs sites, p. ex. dans les systèmes à plusieurs points coordonnés ou dans les systèmes coopératifs à "plusieurs entrées plusieurs sorties" [MIMO]
• H04W 16/32 - Structures hiérarchisées des cellules
• H04L 1/16 - Dispositions pour détecter ou empêcher les erreurs dans l'information reçue en utilisant un canal de retour dans lesquelles le canal de retour transporte des signaux de contrôle, p. ex. répétition de signaux de demande
• H04W 80/02 - Protocoles de couche liaison de données
• H04W 80/08 - Protocoles de couche supérieure
• H04W 72/04 - Affectation de ressources sans fil

Abrégé

Device, methods and systems for implementing aspects of orthogonal time frequency space (OTFS) modulation in wireless systems are described. In an aspect, the device may include a surface of an object for receiving an electromagnetic signal. The surface may be structured to perform a non-electrical function for the object. The surface may generate an electrical signal from an electromagnetic signal. The electromagnetic signal may be received from a transmitter. The transmitter may map digital data to a digital amplitude modulation constellation in a time-frequency space. The digital amplitude modulation constellation may be mapped to a delay-Doppler domain and the transmitter may transmit to the surface according to an orthogonal time frequency space modulation signal scheme. The apparatus may further include a demodulator to demodulate the electrical signal to determine digital data.

Classes IPC  ?

• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission
• H04L 27/00 - Systèmes à porteuse modulée
• H04L 27/26 - Systèmes utilisant des codes à fréquences multiples
• H04B 1/3827 - Émetteurs-récepteurs portatifs
• H04L 27/20 - Circuits de modulationCircuits émetteurs

Abrégé

Methods, systems and devices for distributed cooperative operation of wireless cells based on sparse channel representations are described. One example method includes providing, using a server, seamless wireless connectivity in an area in which a plurality of network nodes are organized as clusters, where each network node is configured to provide wireless connectivity via N angular sectors covering a surrounding area, where N is an integer and wherein angular sectors of the plurality of network nodes collectively cover the area; controlling, by the server, network nodes in a cluster to collect channel condition information for the N angular sectors and communicate the channel condition information to the network-side server, and operating the server to use the channel condition information collected from the network nodes in the cluster to control communication for the network nodes in the cluster at a different time or a different frequency or a different spatial direction.

Classes IPC  ?

• H04W 28/16 - Gestion centrale des ressourcesNégociation de ressources ou de paramètres de communication, p. ex. négociation de la bande passante ou de la qualité de service [QoS Quality of Service]
• H04W 16/24 - Structures des cellules
• H04W 72/044 - Affectation de ressources sans fil sur la base du type de ressources affectées
• H04W 72/542 - Critères d’affectation ou de planification des ressources sans fil sur la base de critères de qualité en utilisant la qualité mesurée ou perçue

Abrégé

Methods, systems and devices for forward error correction in orthogonal time frequency space (OTFS) communication systems using non-binary low-density parity-check (NB-LDPC) codes are described. One exemplary method for forward error correction includes receiving data, encoding the data via a non-binary low density parity check (NB-LDPC) code, wherein the NB-LDPC code is characterized by a matrix with binary and non-binary entries, modulating the encoded data to generate a signal, and transmitting the signal. Another exemplary method for forward error correction includes receiving a signal, demodulating the received signal to produce data, decoding the data via a NB-LDPC code, wherein the NB-LDPC code is characterized by a matrix with binary and non-binary entries, and providing the decoded data to a data sink.

Classes IPC  ?

• H03M 13/11 - Détection d'erreurs ou correction d'erreurs transmises par redondance dans la représentation des données, c.-à-d. mots de code contenant plus de chiffres que les mots source utilisant un codage par blocs, c.-à-d. un nombre prédéterminé de bits de contrôle ajouté à un nombre prédéterminé de bits d'information utilisant plusieurs bits de parité
• H03M 13/25 - Détection d'erreurs ou correction d'erreurs transmises par codage spatial du signal, c.-à-d. en ajoutant une redondance dans la constellation du signal, p. ex. modulation codée en treillis [TMC]
• H03M 13/00 - Codage, décodage ou conversion de code pour détecter ou corriger des erreursHypothèses de base sur la théorie du codageLimites de codageMéthodes d'évaluation de la probabilité d'erreurModèles de canauxSimulation ou test des codes
• H03M 13/29 - Codage, décodage ou conversion de code pour détecter ou corriger des erreursHypothèses de base sur la théorie du codageLimites de codageMéthodes d'évaluation de la probabilité d'erreurModèles de canauxSimulation ou test des codes combinant plusieurs codes ou structures de codes, p. ex. codes de produits, codes de produits généralisés, codes concaténés, codes interne et externe
• H03M 13/39 - Estimation de séquence, c.-à-d. utilisant des méthodes statistiques pour la reconstitution des codes originaux

Abrégé

Orthogonal Time Frequency Space (OTFS) is a novel modulation scheme with significant benefits for 5G systems. The fundamental theory behind OTFS is presented in this paper as well as its benefits. We start with a mathematical description of the doubly fading delay-Doppler channel and develop a modulation that is tailored to this channel. We model the time varying delay-Doppler channel in the time-frequency domain and derive a new domain (the OTFS domain) where we show that the channel is transformed to a time invariant one and all symbols see the same SNR. We explore aspects of the modulation like delay and Doppler resolution, and address design and implementation issues like multiplexing multiple users and evaluating complexity. Finally we present some performance results where we demonstrate the superiority of OTFS.

Classes IPC  ?

• H04L 27/32 - Systèmes à courant porteur caractérisés par des combinaisons de plusieurs types de systèmes couverts par les groupes , , , ou

Abrégé

Methods, systems and devices for wireless communication, which include localization and auto-calibration, are described. One example method includes receiving, at a wireless device, signal transmissions from one or more network devices, and generating, by processing the signal transmissions, a feedback signal for antenna calibration of the one or more network devices. In some embodiments, the antenna calibration is used for performing device localization and feature map generation that is subsequently used for scheduling transmissions in a wireless network.

Classes IPC  ?

• H04W 16/28 - Structures des cellules utilisant l'orientation du faisceau
• H04W 16/00 - Planification du réseau, p. ex. outils de planification de couverture ou de traficDéploiement de réseau, p. ex. répartition des ressources ou structures des cellules
• H04W 16/24 - Structures des cellules

Abrégé

A fixed wireless access system is implemented using orthogonal time frequency space multiplexing (OTFS). Data transmissions to/from different devices share transmission resources using—delay Doppler multiplexing, time-frequency multiplexing, multiplexing at stream and/or layer level, and angular multiplexing. Time-frequency multiplexing is achieved by dividing the time-frequency plan into subgrids, with the subsampled time frequency grid being used to carry the OTFS data. Antenna implementations include a hemispherical antenna with multiple antenna elements arranged in an array to achieve multiplexing.

Classes IPC  ?

• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission
• H01Q 21/24 - Combinaisons d'unités d'antennes polarisées dans des directions différentes pour émettre ou recevoir des ondes polarisées circulairement ou elliptiquement ou des ondes polarisées linéairement dans n'importe quelle direction
• H04B 7/06 - Systèmes de diversitéSystèmes à plusieurs antennes, c.-à-d. émission ou réception utilisant plusieurs antennes utilisant plusieurs antennes indépendantes espacées à la station d'émission
• H04B 7/12 - Diversité de fréquence

Abrégé

Methods, systems and devices for lattice reduction in decision feedback equalizers for orthogonal time frequency space (OTFS) modulation are described. An exemplary wireless communication method, implementable by a wireless communication receiver apparatus, includes receiving a signal comprising information bits modulated using OTFS modulation scheme. Each delay-Doppler bin in the signal is modulated using a quadrature amplitude modulation (QAM) mapping. The method also includes estimating the information bits based on an inverse of a single error covariance matrix of the signal, with the single error covariance matrix being representative of an estimation error for all delay-Doppler bins in the signal.

Classes IPC  ?

• H04W 4/80 - Services utilisant la communication de courte portée, p. ex. la communication en champ proche, l'identification par radiofréquence ou la communication à faible consommation d’énergie
• H04L 25/03 - Réseaux de mise en forme pour émetteur ou récepteur, p. ex. réseaux de mise en forme adaptatifs
• H04L 1/06 - Dispositions pour détecter ou empêcher les erreurs dans l'information reçue par réception à diversité utilisant la diversité d'espace
• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission
• H04L 27/26 - Systèmes utilisant des codes à fréquences multiples

Abrégé

An antenna system that includes a lens portion having a radiation-side curved surface and a feed-side reception surface, the lens portion structured to focus radio frequency radiations entering from the radiation-side curved surface on a focal point located at the feed reception surface and one or more antenna elements at or near the focal point, the one or more antenna elements being separated from each other by a fractional multiple of a center wavelength of a frequency band of operation, and each antenna element communicatively coupled to one or more radio frequency transmit and/or receive chain and being able to transmit and/or receive data from the radio frequency transmit chain according to a transmission scheme.

Classes IPC  ?

• H01Q 19/06 - Combinaisons d'éléments actifs primaires d'antennes avec des dispositifs secondaires, p. ex. avec des dispositifs quasi optiques, pour donner à une antenne une caractéristique directionnelle désirée utilisant des dispositifs de réfraction ou de diffraction, p. ex. lentilles
• H01Q 21/08 - Réseaux d'unités d'antennes, de même polarisation, excitées individuellement et espacées entre elles les unités étant espacées le long du trajet rectiligne ou adjacent à celui-ci

Abrégé

Methods, systems, and devices for spectral sharing wireless systems, wherein multiple user devices share time and frequency resources for uplink and/or downlink transmissions, are described. One example wireless communication system includes a network station, and multiple user devices, wherein data transmissions over the same time and frequency resources are shared between multiple user devices, in downlink and/or uplink, using spatial user device separation that is dynamically computed by the network station, and where the network station derives spatial user device separation based on uplink channel measurements.

Classes IPC  ?

• H04W 16/14 - Dispositions de partage du spectre de fréquence
• H04W 28/16 - Gestion centrale des ressourcesNégociation de ressources ou de paramètres de communication, p. ex. négociation de la bande passante ou de la qualité de service [QoS Quality of Service]

Abrégé

A method for signal transmission using precoded symbol information involves estimating a two-dimensional model of a communication channel in a delay-Doppler domain. A perturbation vector is determined in a delay-time domain wherein the delay-time domain is related to the delay-Doppler domain by an FFT operation. User symbols are modified based upon the perturbation vector so as to produce perturbed user symbols. A set of Tomlinson-Harashima precoders corresponding to a set of fixed times in the delay-time domain may then be determined using a delay-time model of the communication channel. Precoded user symbols are generated by applying the Tomlinson-Harashima precoders to the perturbed user symbols. A modulated signal is then generated based upon the precoded user symbols and provided for transmission over the communication channel.

Classes IPC  ?

• H04B 7/0456 - Sélection de matrices de pré-codage ou de livres de codes, p. ex. utilisant des matrices pour pondérer des antennes
• H04L 27/26 - Systèmes utilisant des codes à fréquences multiples
• H04L 25/497 - Circuits d'émissionCircuits de réception à conversion de code au transmetteurCircuits d'émissionCircuits de réception à pré-distorsionCircuits d'émissionCircuits de réception à insertion d'intervalles morts pour obtenir un spectre de fréquence désiréCircuits d'émissionCircuits de réception à au moins trois niveaux d'amplitude par codage corrélatif, p. ex. par codage à réponse partielle ou par codage par modulation à échos
• H04L 25/02 - Systèmes à bande de base Détails
• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission
• H04B 7/0413 - Systèmes MIMO
• H04L 25/03 - Réseaux de mise en forme pour émetteur ou récepteur, p. ex. réseaux de mise en forme adaptatifs

Abrégé

An Orthogonal Time Frequency Space Modulation (OTFS) modulation scheme achieving multiple access by multiplexing multiple signals at the transmitter-side performs allocation of transmission resources to a first signal and a second signal, combining and converting to a transmission format via OTFS modulation and transmitting the signal over a communication channel. At the receiver, multiplexed signals are recovered using orthogonality property of the basis functions used for the multiplexing at the transmitter.

Classes IPC  ?

• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission
• H04L 1/00 - Dispositions pour détecter ou empêcher les erreurs dans l'information reçue
• H04L 27/26 - Systèmes utilisant des codes à fréquences multiples
• H04B 7/06 - Systèmes de diversitéSystèmes à plusieurs antennes, c.-à-d. émission ou réception utilisant plusieurs antennes utilisant plusieurs antennes indépendantes espacées à la station d'émission
• H04L 25/03 - Réseaux de mise en forme pour émetteur ou récepteur, p. ex. réseaux de mise en forme adaptatifs

Abrégé

A method for modulating data for transmission within a communication system. The method includes establishing a time-frequency shifting matrix of dimension N×N, wherein N is greater than one. The method further includes combining the time-frequency shifting matrix with a data frame to provide an intermediate data frame. A transformed data matrix is provided by permuting elements of the intermediate data frame. A modulated signal is generated in accordance with elements of the transformed data matrix.

Classes IPC  ?

• H04L 27/26 - Systèmes utilisant des codes à fréquences multiples
• H04B 7/005 - Commande de la transmissionÉgalisation
• H04L 27/01 - Égaliseurs
• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission
• H04L 27/10 - Systèmes à courant porteur à modulation de fréquence, p. ex. utilisant une manipulation à décalage de fréquence
• H04L 23/02 - Appareils ou circuits locaux pour systèmes télégraphiques autres que ceux couverts par les groupes adaptés pour la signalisation orthogonale
• H04L 25/03 - Réseaux de mise en forme pour émetteur ou récepteur, p. ex. réseaux de mise en forme adaptatifs

Abrégé

A system and method for orthogonal time frequency space communication and waveform generation. The method includes receiving a plurality of information symbols and encoding an N×M array containing the plurality of information symbols into a two-dimensional array of modulation symbols by spreading each of the plurality of information symbols with respect to both time and frequency. The two-dimensional array of modulation symbols is then transmitted using M mutually orthogonal waveforms included within M frequency sub-bands.

Classes IPC  ?

• H04L 27/26 - Systèmes utilisant des codes à fréquences multiples
• H04L 1/06 - Dispositions pour détecter ou empêcher les erreurs dans l'information reçue par réception à diversité utilisant la diversité d'espace
• G06F 17/14 - Transformations de Fourier, de Walsh ou transformations d'espace analogues
• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission

Abrégé

A wireless communication method for transmitting wireless signals from a transmitter includes dividing bits of the transport block into a number of code blocks, wherein each code block corresponds to a bit-level of a multi-level modulation scheme used for transmission, and wherein a size of each code block is inversely proportional to a corresponding coding rate used for coding the code block.

Classes IPC  ?

• H03M 13/00 - Codage, décodage ou conversion de code pour détecter ou corriger des erreursHypothèses de base sur la théorie du codageLimites de codageMéthodes d'évaluation de la probabilité d'erreurModèles de canauxSimulation ou test des codes
• H04L 1/24 - Tests pour s'assurer du fonctionnement correct
• H03M 13/25 - Détection d'erreurs ou correction d'erreurs transmises par codage spatial du signal, c.-à-d. en ajoutant une redondance dans la constellation du signal, p. ex. modulation codée en treillis [TMC]
• H03M 13/27 - Codage, décodage ou conversion de code pour détecter ou corriger des erreursHypothèses de base sur la théorie du codageLimites de codageMéthodes d'évaluation de la probabilité d'erreurModèles de canauxSimulation ou test des codes utilisant des techniques d'entrelaçage
• H03M 13/29 - Codage, décodage ou conversion de code pour détecter ou corriger des erreursHypothèses de base sur la théorie du codageLimites de codageMéthodes d'évaluation de la probabilité d'erreurModèles de canauxSimulation ou test des codes combinant plusieurs codes ou structures de codes, p. ex. codes de produits, codes de produits généralisés, codes concaténés, codes interne et externe

Abrégé

Methods, apparatus and systems for wireless communication are described. One example method includes estimating, based on channel quality information for a first communication channel during a first time interval, a predicted quality of a second communication channel during a second time interval that is a latency interval after the first time interval and using the predicted quality for processing transmissions on the second communication channel during the second time interval.

Classes IPC  ?

• H04B 17/373 - Prédiction des paramètres de qualité d’un canal
• H04L 1/00 - Dispositions pour détecter ou empêcher les erreurs dans l'information reçue
• H04L 25/03 - Réseaux de mise en forme pour émetteur ou récepteur, p. ex. réseaux de mise en forme adaptatifs
• H04L 12/24 - Dispositions pour la maintenance ou la gestion

Abrégé

Co-existence between an Orthogonal Time Frequency Space (OTFS) modulation system and a Long Term Evolution (LTE) system is achieved by generating a number of transmission beams for a first group of user equipment operating using LTE, and a second group of user equipment operating using the OTFS protocol, and transmitting a first group of data packets formatted according to the LTE protocol to the first group of user equipment and a second group of data packets formatted according to the OTFS protocol to the second group of user equipment. The transmissions are performed by precoding and modulating the first group of data packets according to an LTE modulation scheme, and precoding and modulating the second group of data packets according to an OTFS modulation scheme.

Classes IPC  ?

• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission
• H04L 27/26 - Systèmes utilisant des codes à fréquences multiples
• H04B 7/0456 - Sélection de matrices de pré-codage ou de livres de codes, p. ex. utilisant des matrices pour pondérer des antennes
• H04W 4/06 - Répartition sélective de services de diffusion, p. ex. service de diffusion/multidiffusion multimédiaServices à des groupes d’utilisateursServices d’appel sélectif unidirectionnel
• H04W 72/04 - Affectation de ressources sans fil

Abrégé

Device, methods and systems for precoding in wireless systems using orthogonal time frequency space multiplexing are described. An exemplary method for transmitting wireless signals includes mapping data to generate a quadrature amplitude modulation (QAM) signal in a delay Doppler domain, determining a perturbation signal to minimize expected interference and noise, perturbing the QAM signal with the perturbation signal, thereby producing a perturbed signal, generating a pre-coded signal by pre-coding, using a linear pre-coder, the perturbed signal, and transmitting the pre-coded signal using an orthogonal time frequency space modulation signal scheme.

Classes IPC  ?

• H04L 23/02 - Appareils ou circuits locaux pour systèmes télégraphiques autres que ceux couverts par les groupes adaptés pour la signalisation orthogonale
• H04L 27/34 - Systèmes à courant porteur à modulation de phase et d'amplitude, p. ex. en quadrature d'amplitude
• H04B 7/0417 - Systèmes de rétroaction
• H04B 7/0456 - Sélection de matrices de pré-codage ou de livres de codes, p. ex. utilisant des matrices pour pondérer des antennes

Abrégé

In a transmitter apparatus, a known reference signal is superimposed on top of a data signal that is typically not known a priori to a receiver and the combined signal is transmitted. At a receiver, an iterative channel estimation and equalization technique is used to recover the reference signal and the unknown data signal. In the initial iteration, the known reference signal is recovered by treating the data signal as noise. Subsequent iterations are used to improve estimation of received reference signal and the unknown data signal.

Classes IPC  ?

• H03H 7/30 - Réseaux retardateurs
• H03H 7/40 - Adaptation automatique de l'impédance de charge à l'impédance de la source
• H03K 5/159 - Applications des lignes à retard non couvertes par les sous-groupes précédents
• H04L 25/02 - Systèmes à bande de base Détails
• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission
• H04L 27/01 - Égaliseurs
• H04L 27/34 - Systèmes à courant porteur à modulation de phase et d'amplitude, p. ex. en quadrature d'amplitude

Abrégé

A wireless communication method includes receiving, by a first wireless device during a training phase, reference tones using a first number of resource elements from a transmitter of a second wireless device, wherein the first wireless device comprises multiple receiving antennas, estimating, by the first wireless device, from the receiving the reference tones, a second order statistics of wireless channels between the multiple receiving antennas and the transmitter of the second wireless device, and performing channel estimation, during an operational phase subsequent to the training phase, using the second order statistics and reference tones received on a second number of resource elements, wherein the second number is less than the first number.

Classes IPC  ?

• H04L 25/02 - Systèmes à bande de base Détails
• H04B 7/0413 - Systèmes MIMO
• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission

Abrégé

A method for performing downlink transmissions from a transmitting device to multiple user devices using transmission resources from a multi-dimensional grid of resources is described. The method includes logically partitioning the transmission resources into multiple segments, assigning, to a given user device of the multiple user devices, transmission resources of one or more of the multiple segments, and performing, using at least some of the assigned transmission resources for the given user device, a downlink transmission using an orthogonal time frequency space (OTFS) transformation on data or signals to be transmitted to the given user device.

Classes IPC  ?

• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission
• H04L 23/02 - Appareils ou circuits locaux pour systèmes télégraphiques autres que ceux couverts par les groupes adaptés pour la signalisation orthogonale
• H04W 72/04 - Affectation de ressources sans fil
• H04J 4/00 - Systèmes multiplex combinés à division de temps et à division de fréquence
• H04W 72/12 - Planification du trafic sans fil
• G01S 7/41 - Détails des systèmes correspondant aux groupes , , de systèmes selon le groupe utilisant l'analyse du signal d'écho pour la caractérisation de la cibleSignature de cibleSurface équivalente de cible

Abrégé

Device, methods and systems for aspects of channel estimation for orthogonal time frequency space (OTFS) modulation in wireless systems are described. In an aspect, a method for wireless communication may include receiving, using multiple receive antennas, from a number of user devices, non-orthogonal pilots wherein at least some transmissions of the non-orthogonal pilots from different user devices overlap in at least some time and frequency resources, estimating individual pilots from the number of user devices by computing a pilot separation filter for each antenna, and estimating the wireless channel at time and frequency resources used by the non-orthogonal pilots by filtering the receiving signal at the multiple receiver antennas.

Classes IPC  ?

• H04L 27/02 - Systèmes à courant porteur à modulation d'amplitude, p. ex. utilisant la manipulation par tout ou rienModulation à bande latérale unique ou à bande résiduelle
• H04L 25/02 - Systèmes à bande de base Détails
• H04B 7/024 - Utilisation coopérative d’antennes sur plusieurs sites, p. ex. dans les systèmes à plusieurs points coordonnés ou dans les systèmes coopératifs à "plusieurs entrées plusieurs sorties" [MIMO]
• H04B 7/0417 - Systèmes de rétroaction
• H04B 7/0452 - Systèmes MIMO à plusieurs utilisateurs
• H04W 88/02 - Dispositifs terminaux

Abrégé

A wireless communication device includes a feed port comprising multiple input feeds, a precoding subsystem that is electrically connected to the feed port; and an antenna subsystem electrically connected to the precoding subsystem. The antenna subsystem is configured to transmit an output signal of the precoding subsystem to multiple wireless stations using multiple beams. The precoding subsystem is configured to perform a precoding operation on an input signal from the feed port, wherein the precoding operation maximizes a desired signal level to interference ratio of transmissions to the multiple wireless stations.

Classes IPC  ?

• H04B 7/0404 - Systèmes de diversitéSystèmes à plusieurs antennes, c.-à-d. émission ou réception utilisant plusieurs antennes utilisant plusieurs antennes indépendantes espacées la station mobile comprenant plusieurs antennes, p. ex. pour mettre en œuvre une diversité en voie ascendante
• H04B 7/0408 - Systèmes de diversitéSystèmes à plusieurs antennes, c.-à-d. émission ou réception utilisant plusieurs antennes utilisant plusieurs antennes indépendantes espacées utilisant plusieurs faisceaux, c.-à-d. diversité de faisceaux
• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission

Abrégé

The computer-implemented method includes simulating, by a processor, using an electromagnetic solver including ray launching or ray tracing, multiple rays that reach a vicinity of a receiver of a wireless channel, determining locations of interactions of the rays with an environment of the wireless channel, post-processing, using one or more of the multiple rays, information about received signal at the receiver to obtain temporal variations therein, and determining a characteristic of the wireless channel using results of the post-processing.

Classes IPC  ?

• H04B 17/391 - Modélisation du canal de propagation
• H04B 3/46 - SurveillanceTests
• H04B 10/07 - Dispositions pour la surveillance ou le test de systèmes de transmissionDispositions pour la mesure des défauts de systèmes de transmission
• H04B 17/00 - SurveillanceTests
• H04B 17/30 - SurveillanceTests de canaux de propagation