Methods and systems that improve network performance in time-slotted multi-hop wireless networks, e.g., a Barrage Relay network, are described. In an aspect, the broadcast nature of the Barrage Relay network is leveraged to enable a source node to aggregates unicast packets across multiple destinations with the same priority in one Medium Access Control (MAC) Protocol Data Unit (MPDU). This aggregation advantageously enables a single request message to be sent to a network controller for multiple unicast packets destined for multiple destinations, thereby reducing the contention channel access significantly. In addition, minimal pipeline flushing allows the source node to be scheduled sooner than is required to fully flush the spatial pipeline. This advantageously enables scheduling of queued source nodes to minimize the sum switching delay.
09 - Appareils et instruments scientifiques et électriques
42 - Services scientifiques, technologiques et industriels, recherche et conception
Produits et services
Downloadable and recorded software for wireless
communication; downloadable and recorded digital signal
processing and communication software; downloadable and
recorded audio signal processing and communication software;
downloadable and recorded software for use in radio
frequency (RF) communication devices; apparatus, instruments
and equipment for electronic warfare, namely, sensors, audio
receivers, video receivers, radio receivers, satellite
receivers, and computer hardware and downloadable computer
software for controlling sensors, audio receivers, video
receivers, radio receivers, satellite receivers; electronic
transmitters for jamming signals; apparatus, instruments and
equipment for acoustic communication, namely modems,
sensors, and audio receivers and downloadable computer
software for controlling modems, sensors and audio
receivers; multiple antenna transmission and reception
devices. Design and development of wireless communication systems for
transmission and reception of data; design and development
of digital signal processing systems for transmission and
reception of data; software development for audio and
communication signal processing; design and development of
radio frequency (RF) communication devices, namely modems,
sensors, and audio receivers; design and development of
apparatus, instruments and equipment for electronic warfare,
namely, sensors, audio receivers, video receivers, radio
receivers, satellite receivers; design and development of
electronic transmitters for jamming signals; design and
development of acoustic signal processing systems for
transmission and reception of data; design and development
of multiple antenna transmission and reception devices.
09 - Appareils et instruments scientifiques et électriques
42 - Services scientifiques, technologiques et industriels, recherche et conception
Produits et services
(1) Downloadable and recorded software for wireless communication; downloadable and recorded digital signal processing and communication software; downloadable and recorded audio signal processing and communication software; downloadable and recorded software for use in radio frequency (RF) communication devices; apparatus, instruments and equipment for electronic warfare, namely, sensors, audio receivers, video receivers, radio receivers, satellite receivers, and computer hardware and downloadable computer software for controlling sensors, audio receivers, video receivers, radio receivers, satellite receivers; electronic transmitters for jamming signals; apparatus, instruments and equipment for acoustic communication, namely modems, sensors, and audio receivers and downloadable computer software for controlling modems, sensors and audio receivers; multiple antenna transmission and reception devices. (1) Design and development of wireless communication systems for transmission and reception of data; design and development of digital signal processing systems for transmission and reception of data; software development for audio and communication signal processing; design and development of radio frequency (RF) communication devices, namely modems, sensors, and audio receivers; design and development of apparatus, instruments and equipment for electronic warfare, namely, sensors, audio receivers, video receivers, radio receivers, satellite receivers; design and development of electronic transmitters for jamming signals; design and development of acoustic signal processing systems for transmission and reception of data; design and development of multiple antenna transmission and reception devices.
4.
METHODS AND SYSTEMS FOR SECURE AND EFFICIENT FLEXIBLE FREQUENCY HOPPING ACCESS
H04B 1/7136 - Dispositions pour la production de sauts de fréquences, p. ex. utilisant une batterie de sources de fréquence, un accord continu ou une transformée
H04B 1/7143 - Dispositions pour la production de séquences de sauts
H04W 74/0833 - Procédures d’accès aléatoire, p. ex. avec accès en 4 étapes
5.
CONTROLLING DATA COMMUNICATION QUALITY IN SOFTWARE-DEFINED HETEROGENOUS MULTI-HOP AD HOC NETWORKS
Methods, devices and systems that use a control channel to coordinate quality of data communications in software-defined heterogenous multi-hop ad hoc networks are described. In some embodiments, an example apparatus for wireless communication in a network includes performing, using a control plane, network management functions over a control channel that has a first bandwidth, implements a frequency-hopping operation, and operates at in a first frequency band, and performing, using a data plane that is physically and logically decoupled from the control plane, data forwarding functions, based on a routing decision, over at least one data channel that has a second bandwidth and operates in a second frequency band different from the first frequency band.
H04W 40/26 - Gestion d'informations sur la connectabilité, p. ex. exploration de connectabilité ou mise à jour de connectabilité pour acheminement hybride en combinant un acheminement proactif et un acheminement réactif
H04B 7/026 - Diversité coopérative, p. ex. utilisant des stations fixes ou mobiles en tant que relais
H04K 3/00 - Brouillage de la communicationContre-mesures
H04L 27/20 - Circuits de modulationCircuits émetteurs
H04W 24/06 - Réalisation de tests en trafic simulé
H04W 40/16 - Sélection d'itinéraire ou de voie de communication, p. ex. routage basé sur l'énergie disponible ou le chemin le plus court sur la base de la qualité d'émission ou de la qualité des canaux sur la base des interférences
H04W 40/22 - Sélection d'itinéraire ou de voie de communication, p. ex. routage basé sur l'énergie disponible ou le chemin le plus court utilisant la retransmission sélective en vue d'atteindre une station émettrice-réceptrice de base [BTS Base Transceiver Station] ou un point d'accès
H04W 84/18 - Réseaux auto-organisés, p. ex. réseaux ad hoc ou réseaux de détection
6.
SOFTWARE-DEFINED COGNITIVE NETWORKING FOR WIRELESS COMMUNICATIONS
Devices, systems, and methods for software-defined cognitive networking for wireless communications are provided. An example method of wireless communication includes performing, at a first node of a plurality of nodes, multiple network interference measurements to generate a first local interference model, receiving, from a second node of the plurality of nodes, a second local interference model, combining, at the first node, the first local interference model and the second local interference model to generate a joint interference model, generating, based on the joint interference model, a plurality of interference parameters that characterize a communication channel between the first node and the second node, selecting, based on the plurality of interference parameters, an operating waveform from a plurality of waveforms such that a performance metric for a data communication from the first node to the second node exceeds a threshold, and performing, using the operating waveform, the data communication.
H04B 1/00 - Détails des systèmes de transmission, non couverts par l'un des groupes Détails des systèmes de transmission non caractérisés par le milieu utilisé pour la transmission
H04B 1/10 - Dispositifs associés au récepteur pour limiter ou supprimer le bruit et les interférences
H04W 24/02 - Dispositions pour optimiser l'état de fonctionnement
09 - Appareils et instruments scientifiques et électriques
42 - Services scientifiques, technologiques et industriels, recherche et conception
Produits et services
Downloadable and recorded embedded radio frequency network software in the nature of wireless networking software for transmission and reception of voice, data, video and position location information; downloadable and recorded software for use in digital signal processing and communications networking; downloadable and recorded software for use in audio signal processing and communications networking; downloadable and recorded software for handheld, manpack, and vehicular radio frequency (RF) communications for use with wireless networking radios and radio modules; apparatus, instruments and equipment for electronic warfare, namely, electric sensors, audio receivers, video receivers, radio receivers, satellite receivers, and computer hardware and downloadable computer software for controlling sensors, audio receivers, video receivers, radio receivers, satellite receivers; electronic transmitters for jamming signals; apparatus, instruments and equipment for acoustic communication, namely modems, electric sensors, and audio receivers and downloadable computer software for controlling modems, sensors and audio receivers; multiple antenna transmission and reception devices, namely, antennas and audiovisual receivers Design and development of wireless communication systems for transmission and reception of data; design and development of digital signal processing systems for transmission and reception of data; computer software development for audio and communication signal processing; design and development of radio frequency (RF) communication devices, namely modems, sensors, and audio receivers; design and development of apparatus, instruments and equipment for electronic warfare, namely, sensors, audio receivers, video receivers, radio receivers, satellite receivers; design and development of electronic transmitters for jamming signals; design and development of acoustic signal processing systems for transmission and reception of data; design and development of multiple antenna transmission and reception devices, namely, antennas and audiovisual receivers
8.
CLUSTERED COHERENT DISTRIBUTED SPATIAL MULTIPLEXING IN WIRELESS COMMUNICATION NETWORKS
Embodiments of the disclosed technology are directed to spatially multiplexing different digital data streams which are generated within a distributed network (e.g., MANET, cellular, or Wi-Fi) and are simultaneously transmitted towards a destination radio with multiple antenna elements. An example method for collaborative communication includes clustering the plurality of nodes into a plurality of clusters such that each of the plurality of clusters communicates with a distinct antenna of the plurality of antennas, and performing distributed beamforming in each of the plurality of clusters to transmit a corresponding message of multiple messages directed to the distinct antenna. The described embodiments enable improved performance over existing systems, e.g., increased outage capacity with increasing cluster size.
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 7/08 - 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
H04W 40/06 - Sélection d'itinéraire ou de voie de communication, p. ex. routage basé sur l'énergie disponible ou le chemin le plus court sur la base des ressources nodales sans fil sur la base des caractéristiques des antennes disponibles
9.
Software-defined cognitive networking for wireless communications
Devices, systems, and methods for software-defined cognitive networking for wireless communications are provided. An example method of wireless communication includes performing, at a first node of a plurality of nodes, multiple network interference measurements to generate a first local interference model, receiving, from a second node of the plurality of nodes, a second local interference model, combining, at the first node, the first local interference model and the second local interference model to generate a joint interference model, generating, based on the joint interference model, a plurality of interference parameters that characterize a communication channel between the first node and the second node, selecting, based on the plurality of interference parameters, an operating waveform from a plurality of waveforms such that a performance metric for a data communication from the first node to the second node exceeds a threshold, and performing, using the operating waveform, the data communication.
H04B 1/00 - Détails des systèmes de transmission, non couverts par l'un des groupes Détails des systèmes de transmission non caractérisés par le milieu utilisé pour la transmission
H04B 1/10 - Dispositifs associés au récepteur pour limiter ou supprimer le bruit et les interférences
H04W 24/02 - Dispositions pour optimiser l'état de fonctionnement
10.
ADJACENT-CHANNEL INTERFERENCE CHARACTERIZATION FOR IN-BAND INTERFERENCE EXCISION IN WIRELESS COMMUNICATION SYSTEMS
Methods, systems and devices for interference characterization and excision are described. An example method for wireless communication includes receiving, via an analog prefilter in a first frequency band, a first analog signal comprising a signal-of-interest and an interfering signal, receiving, via the analog prefilter, in an additional frequency band, an additional analog signal, wherein the additional analog signal comprises the interfering signal, generating, based on the additional analog signal, an estimate of the interfering signal, digitizing the first analog signal to generate a first digital signal, canceling the estimate of the interfering signal from the first digital signal to generate an estimate of the signal-of-interest, and demodulating the estimate of the signal-of-interest to generate estimated data symbols.
Methods and systems for low-complexity channel profiling in frequency-hopped (FH) direct-sequence spread spectrum (DSSS) wireless communication systems are described. An example system includes a receiver configured to receive, over a channel, a FH DSSS signal associated with multiple frequency hops, and a processor configured to perform, using a first subset of the multiple frequency hops, a timing acquisition operation using a full correlative processing operation. The receiver is then configured to perform, subsequent to the timing acquisition operation and using a second subset of the multiple frequency hops, a predominant delay estimation operation, where estimating predominant channel delays excludes using the full correlative processing operation, and finally compute, based on an output of the predominant delay estimation operation, a channel estimate comprising an estimate of each of a number of channel taps that represent the channel, and where each channel tap estimate comprises a gain, a phase, and a delay.
09 - Appareils et instruments scientifiques et électriques
Produits et services
Radio frequency network devices in the nature of wireless
networking radios and radio modules for transmission and
reception of voice, data, video and position location
information; radio frequency communications equipment,
namely, wireless networking radios and radio modules for use
in military tactical operations, industrial fields, public
safety, and emergency response operations.
13.
Open-loop distributed beamforming for multiple destinations
Devices, systems and methods for collaborative wireless communication in a wireless network are described. One example method includes performing a bidirectional communication with a reference node in the source cluster, receiving, from a destination cluster comprising a second plurality of nodes, a probe generated using a phase associated with the destination cluster, estimating, based on a propagation delay of the probe, a delay parameter, generating, based on the phase associated with the destination cluster and the delay parameter, a channel estimate, and transmitting, to each of the second plurality of nodes, a common message generated using a phase value and a delay value, wherein the phase value and the delay value are derived based on the channel estimate, and wherein the destination cluster is remotely located from the source cluster.
Methods and systems for cognitive multicarrier communications in the presence of interference are described. An example method for wireless communication includes receiving, in each of a plurality of time-frequency rectangles in a time-frequency plane, a corresponding signal comprising a signal of interest and one or more interfering signals, and processing, for each time-frequency rectangle, the corresponding signal using a doublet to generate an interference-canceled signal comprising the signal of interest. In an example, the doublet is based on two time-domain monopulses with different polarities and a delay, and the doublet is parameterized by (a) a spread parameter associated with a corresponding time-frequency rectangle and (b) a rotation parameter.
H03M 13/19 - Correction d'une seule erreur sans utiliser les propriétés particulières des codes cycliques, p. ex. codes de Hamming, codes de Hamming étendus ou généralisés
H04L 1/00 - Dispositions pour détecter ou empêcher les erreurs dans l'information reçue
H04B 1/10 - Dispositifs associés au récepteur pour limiter ou supprimer le bruit et les interférences
H04B 1/00 - Détails des systèmes de transmission, non couverts par l'un des groupes Détails des systèmes de transmission non caractérisés par le milieu utilisé pour la transmission
H04B 17/336 - Rapport signal/interférence ou rapport porteuse/interférence
09 - Appareils et instruments scientifiques et électriques
Produits et services
Radio frequency network devices in the nature of wireless networking radios and radio modules for transmission and reception of voice, data, video and position location information; radio frequency communications equipment, namely, wireless networking radios and radio modules for use in military tactical operations, industrial fields, public safety, and emergency response operations
16.
Dynamic spectrum access for single-channel mobile ad-hoc networks
Methods, systems, and devices for dynamic spectrum access in a single-channel MANET are described. An example system for network management includes a first wireless device configured to perform, using a receive mode and a transmit mode, data communications on a first channel associated with a first single-channel network, and transmit, using the transmit mode, network advertisement messages on a second channel associated with a second single-channel network, wherein each of the network advertisement messages comprises one or more characteristics of the first single-channel network, and a second wireless device configured to perform, using the receive mode and the transmit mode, data communications on the second channel, acquire, using the receive mode, at least one network advertisement message of the network advertisement messages on the second channel, and perform, based on the at least one network advertisement message, a comparison between the first single-channel network and the second single-channel network.
H04W 16/14 - Dispositions de partage du spectre de fréquence
H04B 7/26 - Systèmes de transmission radio, c.-à-d. utilisant un champ de rayonnement pour communication entre plusieurs postes dont au moins un est mobile
H04W 72/541 - Critères d’affectation ou de planification des ressources sans fil sur la base de critères de qualité en utilisant le niveau d’interférence
H04W 84/18 - Réseaux auto-organisés, p. ex. réseaux ad hoc ou réseaux de détection
H04W 88/06 - Dispositifs terminaux adapté au fonctionnement dans des réseaux multiples, p. ex. terminaux multi-mode
17.
Controlling data communication quality in software-defined heterogenous multi-hop ad hoc networks
Methods, devices and systems that use a control channel to coordinate quality of data communications in software-defined heterogenous multi-hop ad hoc networks are described. In some embodiments, an example apparatus for wireless communication in a network includes performing, using a control plane, network management functions over a control channel that has a first bandwidth, implements a frequency-hopping operation, and operates at in a first frequency band, and performing, using a data plane that is physically and logically decoupled from the control plane, data forwarding functions, based on a routing decision, over at least one data channel that has a second bandwidth and operates in a second frequency band different from the first frequency band.
H04W 40/16 - Sélection d'itinéraire ou de voie de communication, p. ex. routage basé sur l'énergie disponible ou le chemin le plus court sur la base de la qualité d'émission ou de la qualité des canaux sur la base des interférences
H04W 40/22 - Sélection d'itinéraire ou de voie de communication, p. ex. routage basé sur l'énergie disponible ou le chemin le plus court utilisant la retransmission sélective en vue d'atteindre une station émettrice-réceptrice de base [BTS Base Transceiver Station] ou un point d'accès
H04W 40/26 - Gestion d'informations sur la connectabilité, p. ex. exploration de connectabilité ou mise à jour de connectabilité pour acheminement hybride en combinant un acheminement proactif et un acheminement réactif
H04L 27/20 - Circuits de modulationCircuits émetteurs
H04W 84/18 - Réseaux auto-organisés, p. ex. réseaux ad hoc ou réseaux de détection
Methods, systems and devices for interference cancellation of high-power input signals in the analog domain are described. An example method of interference cancellation includes receiving, via an antenna, an analog signal comprising a signal of interest and one or more interfering signals, wherein the one or more interfering signals comprises a high-power interfering signal with a signal power greater than 15 dBm, determining, based on a reference signal corresponding to the high-power interfering signal, an update to at least one parameter of the reference signal, wherein the update is determined by minimizing a cost function of a difference between the reference signal and the high-power interfering signal, generating, based on the update to the at least one parameter, a modified reference signal, and generating, based on coupling the modified reference signal to the analog signal, an interference-canceled signal comprising the signal of interest.
H04B 1/525 - Dispositions hybrides, c.-à-d. dispositions pour la transition d’une transmission bilatérale sur une voie à une transmission unidirectionnelle sur chacune des deux voies ou vice versa avec des moyens de réduction de la fuite du signal de l’émetteur vers le récepteur
H04B 1/12 - Montages de neutralisation, d'équilibrage ou de compensation
19.
ADJACENT-CHANNEL INTERFERENCE CHARACTERIZATION FOR IN-BAND INTERFERENCE EXCISION IN WIRELESS COMMUNICATION SYSTEMS
Methods, systems and devices for interference characterization and excision are described. An example method for wireless communication includes receiving, via an analog prefilter in a first frequency band, a first analog signal comprising a signal-of- interest and an interfering signal, receiving, via the analog prefilter, in an additional frequency band, an additional analog signal, wherein the additional analog signal comprises the interfering signal, generating, based on the additional analog signal, an estimate of the interfering signal, digitizing the first analog signal to generate a first digital signal, canceling the estimate of the interfering signal from the first digital signal to generate an estimate of the signal-of-interest, and demodulating the estimate of the signal-of-interest to generate estimated data symbols.
Embodiments of the disclosed technology are directed to spatially multiplexing different digital data streams which are generated within a distributed network (e.g., MANET, cellular, or Wi-Fi) and are simultaneously transmitted towards a destination radio with multiple antenna elements. An example method for collaborative communication includes clustering the plurality of nodes into a plurality of clusters such that each of the plurality of clusters communicates with a distinct antenna of the plurality of antennas, and performing distributed beamforming in each of the plurality of clusters to transmit a corresponding message of multiple messages directed to the distinct antenna. The described embodiments enable improved performance over existing systems, e.g., increased outage capacity with increasing cluster size.
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]
H04L 1/1829 - Dispositions spécialement adaptées au point de réception
H04W 40/22 - Sélection d'itinéraire ou de voie de communication, p. ex. routage basé sur l'énergie disponible ou le chemin le plus court utilisant la retransmission sélective en vue d'atteindre une station émettrice-réceptrice de base [BTS Base Transceiver Station] ou un point d'accès
21.
Multi-channel time-division multiplexing access methods and systems
Devices, systems and methods for high-utilization low-latency multi-channel time-division multiplexing access (TDMA) are described. One example method for wireless communication includes performing, in a first time interval of a time-division multiple access (TDMA) slot, a transmission of a first data unit over a first logical channel of the plurality of logical channels, refraining from transmitting, subsequent to a completion of the transmission of the first data unit, for a second time interval immediately after the first time interval, and performing (N−1) transmissions in (N−1) time intervals for each data unit of (N−1) subsequent data units in the TDMA slot, such that a transmission of an nth data unit of the (N−1) subsequent data units is performed over an nth logical channel of the plurality of logical channels.
Embodiments of the disclosed technology are directed to spatially multiplexing different digital data streams which are generated within a distributed network (e.g., MANET, cellular, or Wi-Fi) and are simultaneously transmitted towards a destination radio with multiple antenna elements. An example method for collaborative communication includes clustering the plurality of nodes into a plurality of clusters such that each of the plurality of clusters communicates with a distinct antenna of the plurality of antennas, and performing distributed beamforming in each of the plurality of clusters to transmit a corresponding message of multiple messages directed to the distinct antenna. The described embodiments enable improved performance over existing systems, e.g., increased outage capacity with increasing cluster size.
H04L 1/00 - Dispositions pour détecter ou empêcher les erreurs dans l'information reçue
H04L 1/1829 - Dispositions spécialement adaptées au point de réception
H04W 40/22 - Sélection d'itinéraire ou de voie de communication, p. ex. routage basé sur l'énergie disponible ou le chemin le plus court utilisant la retransmission sélective en vue d'atteindre une station émettrice-réceptrice de base [BTS Base Transceiver Station] ou un point d'accès
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]
23.
DYNAMIC SPECTRUM ACCESS FOR SINGLE-CHANNEL MOBILE AD-HOC NETWORKS
Methods, systems, and devices for dynamic spectrum access in a single-channel MANET are described. An example system for network management includes a first wireless device configured to perform, using a receive mode and a transmit mode, data communications on a first channel associated with a first single-channel network, and transmit, using the transmit mode, network advertisement messages on a second channel associated with a second single-channel network, wherein each of the network advertisement messages comprises one or more characteristics of the first single-channel network, and a second wireless device configured to perform, using the receive mode and the transmit mode, data communications on the second channel, acquire, using the receive mode, at least one network advertisement message of the network advertisement messages on the second channel, and perform, based on the at least one network advertisement message, a comparison between the first single-channel network and the second single-channel network.
Methods, systems, and devices for dynamic spectrum access in a single-channel MANET are described. An example system for network management includes a first wireless device configured to perform, using a receive mode and a transmit mode, data communications on a first channel associated with a first single-channel network, and transmit, using the transmit mode, network advertisement messages on a second channel associated with a second single-channel network, wherein each of the network advertisement messages comprises one or more characteristics of the first single-channel network, and a second wireless device configured to perform, using the receive mode and the transmit mode, data communications on the second channel, acquire, using the receive mode, at least one network advertisement message of the network advertisement messages on the second channel, and perform, based on the at least one network advertisement message, a comparison between the first single-channel network and the second single-channel network.
Devices, systems and methods for collaborative wireless communication in a wireless network are described. One example method includes performing a bidirectional communication with a reference node in the source cluster, receiving, from a destination cluster comprising a second plurality of nodes, a probe generated using a phase associated with the destination cluster, estimating, based on a propagation delay of the probe, a delay parameter, generating, based on the phase associated with the destination cluster and the delay parameter, a channel estimate, and transmitting, to each of the second plurality of nodes, a common message generated using a phase value and a delay value, wherein the phase value and the delay value are derived based on the channel estimate, and wherein the destination cluster is remotely located from the source cluster.
H04L 12/26 - Dispositions de surveillance; Dispositions de test
H04B 7/04 - Systèmes de diversitéSystèmes à plusieurs antennes, c.-à-d. émission ou réception utilisant plusieurs antennes utilisant plusieurs antennes indépendantes espacées
H04W 84/18 - Réseaux auto-organisés, p. ex. réseaux ad hoc ou réseaux de détection
H04W 16/28 - Structures des cellules utilisant l'orientation du faisceau
26.
OPEN-LOOP DISTRIBUTED BEAMFORMING FOR MULTIPLE DESTINATIONS
Devices, systems and methods for collaborative wireless communication in a wireless network are described. One example method includes performing a bidirectional communication with a reference node in the source cluster, receiving, from a destination cluster comprising a second plurality of nodes, a probe generated using a phase associated with the destination cluster, estimating, based on a propagation delay of the probe, a delay parameter, generating, based on the phase associated with the destination cluster and the delay parameter, a channel estimate, and transmitting, to each of the second plurality of nodes, a common message generated using a phase value and a delay value, wherein the phase value and the delay value are derived based on the channel estimate, and wherein the destination cluster is remotely located from the source cluster.
H04B 7/04 - Systèmes de diversitéSystèmes à plusieurs antennes, c.-à-d. émission ou réception utilisant plusieurs antennes utilisant plusieurs antennes indépendantes espacées
H04W 16/28 - Structures des cellules utilisant l'orientation du faisceau
H04W 84/18 - Réseaux auto-organisés, p. ex. réseaux ad hoc ou réseaux de détection
27.
Controlling data communication quality in software-defined heterogenous multi-hop ad hoc networks
Methods, devices and systems that use a control channel to coordinate quality of data communications in software-defined heterogenous multi-hop ad hoc networks are described. In some embodiments, an example apparatus for wireless communication in a network includes performing, using a control plane, network management functions over a control channel that has a first bandwidth, implements a frequency-hopping operation, and operates at in a first frequency band, and performing, using a data plane that is physically and logically decoupled from the control plane, data forwarding functions, based on a routing decision, over at least one data channel that has a second bandwidth and operates in a second frequency band different from the first frequency band.
H04W 4/00 - Services spécialement adaptés aux réseaux de télécommunications sans filLeurs installations
H04W 40/26 - Gestion d'informations sur la connectabilité, p. ex. exploration de connectabilité ou mise à jour de connectabilité pour acheminement hybride en combinant un acheminement proactif et un acheminement réactif
H04B 7/026 - Diversité coopérative, p. ex. utilisant des stations fixes ou mobiles en tant que relais
H04W 40/22 - Sélection d'itinéraire ou de voie de communication, p. ex. routage basé sur l'énergie disponible ou le chemin le plus court utilisant la retransmission sélective en vue d'atteindre une station émettrice-réceptrice de base [BTS Base Transceiver Station] ou un point d'accès
H04K 3/00 - Brouillage de la communicationContre-mesures
H04W 40/16 - Sélection d'itinéraire ou de voie de communication, p. ex. routage basé sur l'énergie disponible ou le chemin le plus court sur la base de la qualité d'émission ou de la qualité des canaux sur la base des interférences
H04W 24/06 - Réalisation de tests en trafic simulé
H04L 27/20 - Circuits de modulationCircuits émetteurs
H04W 84/18 - Réseaux auto-organisés, p. ex. réseaux ad hoc ou réseaux de détection
28.
Network-enabled connectivity for disadvantaged communication links
Devices, systems and methods for providing network-enabled connectivity for disadvantaged communication links in wireless networks are described. One example method for enabling connectivity over a disadvantaged link includes receiving, by a first node of a plurality of nodes from a source node in the first frequency band in a first timeslot, a first signal comprising a message, receiving, by the first node from at least a second node in a second frequency band in a second timeslot, a second signal that is used to generate a first reliability metric corresponding to the message, and performing, based on a plurality of reliability metrics corresponding to the message and the first reliability metric, a processing operation on the message, the first frequency band being non-overlapping with the second frequency band, and a duration of the first timeslot being greater than a duration of the second timeslot.
H04W 4/00 - Services spécialement adaptés aux réseaux de télécommunications sans filLeurs installations
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
H04W 72/0453 - Ressources du domaine fréquentiel, p. ex. porteuses dans des AMDF [FDMA]
Methods, systems and devices for interference cancellation of high-power input signals in the analog domain are described. An example method of interference cancellation includes receiving, via an antenna, an analog signal comprising a signal of interest and one or more interfering signals, wherein the one or more interfering signals comprises a high-power interfering signal with a signal power greater than 15 dBm, determining, based on a reference signal corresponding to the high-power interfering signal, an update to at least one parameter of the reference signal, wherein the update is determined by minimizing a cost function of a difference between the reference signal and the high-power interfering signal, generating, based on the update to the at least one parameter, a modified reference signal, and generating, based on coupling the modified reference signal to the analog signal, an interference-canceled signal comprising the signal of interest.
H04B 1/62 - Détails des systèmes de transmission, non couverts par l'un des groupes Détails des systèmes de transmission non caractérisés par le milieu utilisé pour la transmission pour produire une prédistorsion du signal à l'émission et une correction correspondante à la réception, p. ex. pour améliorer le rapport signal/bruit
H04B 1/10 - Dispositifs associés au récepteur pour limiter ou supprimer le bruit et les interférences
30.
Multi-channel time-division multiplexing access methods and systems
Devices, systems and methods for high-utilization low-latency multi-channel time-division multiplexing access (TDMA) are described. One example method for wireless communication includes performing, in a first time interval of a time-division multiple access (TDMA) slot, a transmission of a first data unit over a first logical channel of the plurality of logical channels, refraining from transmitting, subsequent to a completion of the transmission of the first data unit, for a second time interval immediately after the first time interval, and performing (N−1) transmissions in (N−1) time intervals for each data unit of (N−1) subsequent data units in the TDMA slot, such that a transmission of an nth data unit of the (N−1) subsequent data units is performed over an nth logical channel of the plurality of logical channels.
Devices, systems and methods for providing network-enabled connectivity for disadvantaged communication links in wireless networks are described. One example method for enabling connectivity over a disadvantaged link includes receiving, by a first node of a plurality of nodes from a source node in the first frequency band in a first timeslot, a first signal comprising a message, receiving, by the first node from at least a second node in a second frequency band in a second timeslot, a second signal that is used to generate a first reliability metric corresponding to the message, and performing, based on a plurality of reliability metrics corresponding to the message and the first reliability metric, a processing operation on the message, the first frequency band being non-overlapping with the second frequency band, and a duration of the first timeslot being greater than a duration of the second timeslot.
H04W 40/12 - Sélection d'itinéraire ou de voie de communication, p. ex. routage basé sur l'énergie disponible ou le chemin le plus court sur la base de la qualité d'émission ou de la qualité des canaux
H04W 84/18 - Réseaux auto-organisés, p. ex. réseaux ad hoc ou réseaux de détection
33.
NETWORK-ENABLED CONNECTIVITY FOR DISADVANTAGED COMMUNICATION LINKS
Devices, systems and methods for providing network-enabled connectivity for disadvantaged communication links in wireless networks are described. One example method for enabling connectivity over a disadvantaged link includes receiving, by a first node of a plurality of nodes from a source node in the first frequency band in a first timeslot, a first signal comprising a message, receiving, by the first node from at least a second node in a second frequency band in a second timeslot, a second signal that is used to generate a first reliability metric corresponding to the message, and performing, based on a plurality of reliability metrics corresponding to the message and the first reliability metric, a processing operation on the message, the first frequency band being non-overlapping with the second frequency band, and a duration of the first timeslot being greater than a duration of the second timeslot.
H04W 84/18 - Réseaux auto-organisés, p. ex. réseaux ad hoc ou réseaux de détection
H04W 40/12 - Sélection d'itinéraire ou de voie de communication, p. ex. routage basé sur l'énergie disponible ou le chemin le plus court sur la base de la qualité d'émission ou de la qualité des canaux
34.
Network-enabled connectivity for disadvantaged communication links
Devices, systems and methods for providing network-enabled connectivity for disadvantaged communication links in wireless networks are described. One example method for enabling connectivity over a disadvantaged link includes receiving, by a first node of a plurality of nodes from a source node in the first frequency band in a first timeslot, a first signal comprising a message, receiving, by the first node from at least a second node in a second frequency band in a second timeslot, a second signal that is used to generate a first reliability metric corresponding to the message, and performing, based on a plurality of reliability metrics corresponding to the message and the first reliability metric, a processing operation on the message, the first frequency band being non-overlapping with the second frequency band, and a duration of the first timeslot being greater than a duration of the second timeslot.
09 - Appareils et instruments scientifiques et électriques
42 - Services scientifiques, technologiques et industriels, recherche et conception
Produits et services
Software for use in digital signal processing and
communications networking; radio frequency network software
in the nature of wireless networking software for
transmission and reception of voice, data, video and
position location information; software for handheld,
manpack, and vehicular radio frequency communications,
namely, wireless networking radios and radio modules. Software engineering and design services in the field of
digital signal processing and communications networking.
09 - Appareils et instruments scientifiques et électriques
Produits et services
Radio frequency network devices in the nature of wireless
networking radios and radio modules for transmission and
reception of voice, data, video and position location
information; radio frequency communications equipment,
namely, wireless networking radios and radio modules for use
in public safety, industrial fields, military tactical
operations and emergency response operations.
09 - Appareils et instruments scientifiques et électriques
42 - Services scientifiques, technologiques et industriels, recherche et conception
Produits et services
Computer hardware and recorded software for use in digital
signal processing and communications networking; radio
frequency network devices in the nature of wireless
networking radios and radio modules for transmission and
reception of voice, data, video and position location
information; handheld radio frequency communications
equipment, namely, wireless networking radios and radio
modules. Computer hardware and software engineering and design
services in the field of digital signal processing and
communications networking.
38.
DISTRIBUTED COLLABORATIVE BEAMFORMING IN WIRELESS NETWORKS
Devices, systems and methods for collaborative wireless communication in a wireless network are described. One example method includes performing, by a first node of a plurality of nodes, a communication with at least a second node of the plurality of nodes, receiving, by the first node from a destination node of the plurality of nodes, a probe, computing, based on the probe, a phase of a strongest tap of a channel estimate between the first node and the destination node, computing a phase correction based on the phase of the strongest tap and a phase difference between a first phase of the first node and a second phase of a reference node, wherein the phase difference is based on the communication, and transmitting, to the destination node, a message with the phase correction.
H04W 40/28 - Gestion d'informations sur la connectabilité, p. ex. exploration de connectabilité ou mise à jour de connectabilité pour acheminement réactif
H04W 84/18 - Réseaux auto-organisés, p. ex. réseaux ad hoc ou réseaux de détection
39.
Distributed collaborative beamforming in wireless networks
Devices, systems and methods for collaborative wireless communication in a wireless network are described. One example method includes performing, by a first node of a plurality of nodes, a communication with at least a second node of the plurality of nodes, receiving, by the first node from a destination node of the plurality of nodes, a probe, computing, based on the probe, a phase of a strongest tap of a channel estimate between the first node and the destination node, computing a phase correction based on the phase of the strongest tap and a phase difference between a first phase of the first node and a second phase of a reference node, wherein the phase difference is based on the communication, and transmitting, to the destination node, a message with the phase correction.
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 17/309 - Mesure ou estimation des paramètres de qualité d’un canal
Devices, systems and methods for collaborative wireless communication in a wireless network are described. One example method includes performing, by a first node of a plurality of nodes, a communication with at least a second node of the plurality of nodes, receiving, by the first node from a destination node of the plurality of nodes, a probe, computing, based on the probe, a phase of a strongest tap of a channel estimate between the first node and the destination node, computing a phase correction based on the phase of the strongest tap and a phase difference between a first phase of the first node and a second phase of a reference node, wherein the phase difference is based on the communication, and transmitting, to the destination node, a message with the phase correction.
H04W 40/28 - Gestion d'informations sur la connectabilité, p. ex. exploration de connectabilité ou mise à jour de connectabilité pour acheminement réactif
H04W 84/18 - Réseaux auto-organisés, p. ex. réseaux ad hoc ou réseaux de détection
09 - Appareils et instruments scientifiques et électriques
Produits et services
Radio frequency network devices in the nature of wireless networking radios and radio modules for transmission and reception of voice, data, video and position location information; radio frequency communications equipment, namely, wireless networking radios and radio modules for use in public safety, industrial fields, military tactical operations, and emergency response operations
09 - Appareils et instruments scientifiques et électriques
42 - Services scientifiques, technologiques et industriels, recherche et conception
Produits et services
Downloadable, recorded, and hardware embedded software for use in digital signal processing and communications networking; downloadable, recorded, and hardware embedded radio frequency network software in the nature of wireless networking software for transmission and reception of voice, data, video and position location information; downloadable, recorded, and hardware embedded software for handheld, manpack, and vehicular radio frequency communications for use with wireless networking radios and radio modules Software engineering and design services in the field of digital signal processing and communications networking
43.
CONTROLLING DATA COMMUNICATION QUALITY IN SOFTWARE-DEFINED HETEROGENOUS MULTI-HOP AD HOC NETWORKS
Methods, devices and systems that use a control channel to coordinate quality of data communications in software-defined heterogenous multi-hop ad hoc networks are described. In some embodiments, an example apparatus for wireless communication in a network includes performing, using a control plane, network management functions over a control channel that has a first bandwidth implements a frequency-hopping operation, and operates at in a first frequency band, and performing, using a data plane that is physically and logically decoupled from the control plane, data forwarding functions, based on a routing decision, over at least one data channel that has a second bandwidth and operates in a second frequency band different from the first frequency band.
Methods, devices and systems that use a control channel to coordinate quality of data communications in software-defined heterogenous multi-hop ad hoc networks are described. In some embodiments, an example apparatus for wireless communication in a network includes performing, using a control plane, network management functions over a control channel that has a first bandwidth implements a frequency-hopping operation, and operates at in a first frequency band, and performing, using a data plane that is physically and logically decoupled from the control plane, data forwarding functions, based on a routing decision, over at least one data channel that has a second bandwidth and operates in a second frequency band different from the first frequency band.
Methods, devices and systems that use a control channel to coordinate quality of data communications in software-defined heterogenous multi-hop ad hoc networks are described. In some embodiments, an example apparatus for wireless communication in a network includes performing, using a control plane, network management functions over a control channel that has a first bandwidth, implements a frequency-hopping operation, and operates at in a first frequency band, and performing, using a data plane that is physically and logically decoupled from the control plane, data forwarding functions, based on a routing decision, over at least one data channel that has a second bandwidth and operates in a second frequency band different from the first frequency band.
H04W 40/26 - Gestion d'informations sur la connectabilité, p. ex. exploration de connectabilité ou mise à jour de connectabilité pour acheminement hybride en combinant un acheminement proactif et un acheminement réactif
H04B 7/026 - Diversité coopérative, p. ex. utilisant des stations fixes ou mobiles en tant que relais
H04W 40/22 - Sélection d'itinéraire ou de voie de communication, p. ex. routage basé sur l'énergie disponible ou le chemin le plus court utilisant la retransmission sélective en vue d'atteindre une station émettrice-réceptrice de base [BTS Base Transceiver Station] ou un point d'accès
H04K 3/00 - Brouillage de la communicationContre-mesures
H04W 40/16 - Sélection d'itinéraire ou de voie de communication, p. ex. routage basé sur l'énergie disponible ou le chemin le plus court sur la base de la qualité d'émission ou de la qualité des canaux sur la base des interférences
H04W 24/06 - Réalisation de tests en trafic simulé
H04L 27/20 - Circuits de modulationCircuits émetteurs
H04W 84/18 - Réseaux auto-organisés, p. ex. réseaux ad hoc ou réseaux de détection
09 - Appareils et instruments scientifiques et électriques
42 - Services scientifiques, technologiques et industriels, recherche et conception
Produits et services
Computer hardware and recorded software for use in digital signal processing and communications networking; radio frequency network devices in the nature of wireless networking radios and radio modules for transmission and reception of voice, data, video and position location information; handheld radio frequency communications equipment, namely, wireless networking radios and radio modules Computer hardware and software engineering and design services in the field of digital signal processing and communications networking
47.
Methods and systems for improving communication using angle dithering
Methods and systems for improving communication using angle dithering are presented. Embodiments of the present invention provide increased throughput and robustness after link establishment by providing fast fading characteristics in environments dominated by slow fading. In particular, fast fading characteristics are induced by steering the transmitter and receiver antennas in optical and beyond line-of-sight troposcatter communication systems based on dither patterns. In non-line-of-sight (NLOS) communication systems, using coordinated dither patterns at the transmitter and receiver ensures that successive common scattering volumes become decorrelated, whereas in line-of-sight optical communication systems, the dither pattern is based on the tropospheric scintillation in free space traversed by the established link.
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 7/06 - 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 1/10 - Dispositifs associés au récepteur pour limiter ou supprimer le bruit et les interférences
H04W 72/08 - Affectation de ressources sans fil sur la base de critères de qualité
Devices, systems and methods for analog automatic gain control (AGC) based on estimated distributions of signal characteristics are described. One example method includes generating a digital measurement of a first signal characteristic based on a second signal characteristic of an input signal received by the device, where the second signal characteristic is based on a level of the input signal. The digital measurement of the signal characteristic is used to update a statistical model for the input signal and the posterior probability distribution of the second signal characteristic conditioned on previous digital measurements of the first signal characteristic. The updated posterior probability distribution is used to generate a gain estimate, which is then used to adjust the power level of the input signal. Another example method may use multiple statistical models for each waveform supported by the system.
Methods and systems for improving communication in a multi-hop, time-slotted wireless network are presented. Embodiments of the present invention are able re-use timeslots to locally transmit information to one-hop nodes, thereby utilizing the bandwidth more efficiently. Other embodiments are able to evaluate the trade-off between power consumption and communication reliability, and are consequently able to provide increasing degrees of robustness for broadcasts in the wireless network. That is, these latter embodiments are able to incrementally use re- transmissions, therein trading-off battery life for an increased message completion rate or a lower packet error rate, for example, in order to reliably broadcast critical or high-priority message network-wide.
Methods and systems for improving communication in a multi-hop, time-slotted wireless network are presented. Embodiments of the present invention are able re-use timeslots to locally transmit information to one-hop nodes, thereby utilizing the bandwidth more efficiently. Other embodiments are able to evaluate the trade-off between power consumption and communication reliability, and are consequently able to provide increasing degrees of robustness for broadcasts in the wireless network. That is, these latter embodiments are able to incrementally use re- transmissions, therein trading-off battery life for an increased message completion rate or a lower packet error rate, for example, in order to reliably broadcast critical or high-priority message network-wide.
Methods and systems for improving communication in a multi-hop, time-slotted wireless network are presented. Embodiments of the present invention are able re-use timeslots to locally transmit information to one-hop nodes, thereby utilizing the bandwidth more efficiently. Other embodiments are able to evaluate the trade-off between power consumption and communication reliability, and are consequently able to provide increasing degrees of robustness for broadcasts in the wireless network. That is, these latter embodiments are able to incrementally use re-transmissions, therein trading-off battery life for an increased message completion rate or a lower packet error rate, for example, in order to reliably broadcast critical or high-priority message network-wide.
H04W 40/04 - Sélection d'itinéraire ou de voie de communication, p. ex. routage basé sur l'énergie disponible ou le chemin le plus court sur la base des ressources nodales sans fil
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
A method and system for maximizing throughput and minimiz- ing latency in a communication system that supports heterogeneous links is pre- sented. The communication system supports a primary link and an alternate link, and the method and system leverage the alternate link to reduce the overhead transmitted over the primary link, thereby increasing throughput and reducing end-to-end latency. The higher latency alternate link provides a delayed version of an information signal that corresponds to a portion of the information signal that is transmitted on the primary link. The received samples from the primary and alternate links may be used to equalize subsequent portions of the informa- tion signal received over the primary link, and may also be used for synchro- nization, timing recovery, DC offset removal, I/Q imbalance compensation, and frequency-offset estimation.
A method and system for maximizing throughput and minimizing latency in a communication system that supports heterogeneous links is presented. The communication system supports a primary link and an alternate link, and the method and system leverage the alternate link to reduce the overhead transmitted over the primary link, thereby increasing throughput and reducing end-to-end latency. The higher latency alternate link provides a delayed version of an information signal that corresponds to a portion of the information signal that is transmitted on the primary link. The received samples from the primary and alternate links may be used to equalize subsequent portions of the information signal received over the primary link, and may also be used for synchronization, timing recovery, DC offset removal, I/Q imbalance compensation, and frequency-offset estimation.
Methods and systems for reliable broadcasting that use re-transmissions, in a multi-hop, time-slotted wireless network, is presented. The methods and systems evaluate the trade-off between power consumption and communication reliability, and are consequently able to provide increasing degrees of robustness for broadcasts in the wireless network. Embodiments of the present invention are able to incrementally use re-transmissions, therein trading-off battery life for an increased message completion rate or a lower packet error rate, for example, in order to reliably broadcast critical or high-priority message network-wide.
H04L 1/18 - Systèmes de répétition automatique, p. ex. systèmes Van Duuren
H04L 12/721 - Procédures de routage, p.ex. routage par le chemin le plus court, routage par la source, routage à état de lien ou routage par vecteur de distance
H04L 12/733 - Sélection d’un chemin de longueur minimum ou de nombre de sauts minimum
H04L 12/26 - Dispositions de surveillance; Dispositions de test
H04L 1/00 - Dispositions pour détecter ou empêcher les erreurs dans l'information reçue
55.
METHODS AND SYSTEMS FOR IMPROVED AUTHENTICATED ENCRYPTION IN COUNTER-BASED CIPHER SYSTEMS
Methods and systems for improving authenticated encryption in counter-based cipher systems are presented. Embodiments of the present invention provide secure and efficient means to achieve both the authenticity and privacy goals of authenticated encryption, and are compatible with most block cipher modes of operation, e.g. CBC, CFB and CTR, and most symmetric-key cryptographic functions, e.g. AES, DES and RC5. In particular, using block cipher encryption with data-dependent initialization vectors achieve the privacy goal and enable over-the-air transmissions to remain uncompromised, especially in scenarios that may result in the counter being reset in counter-based cipher systems.
H04L 9/28 - Dispositions pour les communications secrètes ou protégéesProtocoles réseaux de sécurité utilisant un algorithme de chiffrement particulier
H04L 9/32 - Dispositions pour les communications secrètes ou protégéesProtocoles réseaux de sécurité comprenant des moyens pour vérifier l'identité ou l'autorisation d'un utilisateur du système
56.
METHODS AND SYSTEMS FOR IMPROVED AUTHENTICATED ENCRYPTION IN COUNTER-BASED CIPHER SYSTEMS
Methods and systems for improving authenticated encryption in counter-based cipher systems are presented. Embodiments of the present invention provide secure and efficient means to achieve both the authenticity and privacy goals of authenticated encryption, and are compatible with most block cipher modes of operation, e.g. CBC, CFB and CTR, and most symmetric-key cryptographic functions, e.g. AES, DES and RC5. In particular, using block cipher encryption with data-dependent initialization vectors achieve the privacy goal and enable over-the-air transmissions to remain uncompromised, especially in scenarios that may result in the counter being reset in counter-based cipher systems.
H04L 9/28 - Dispositions pour les communications secrètes ou protégéesProtocoles réseaux de sécurité utilisant un algorithme de chiffrement particulier
H04L 9/32 - Dispositions pour les communications secrètes ou protégéesProtocoles réseaux de sécurité comprenant des moyens pour vérifier l'identité ou l'autorisation d'un utilisateur du système
57.
Methods and systems for improved authenticated encryption in counter-based cipher systems
Methods and systems for improving authenticated encryption in counter-based cipher systems are presented. Embodiments of the present invention provide secure and efficient means to achieve both the authenticity and privacy goals of authenticated encryption, and are compatible with most block cipher modes of operation, e.g. CBC, CFB and CTR, and most symmetric-key cryptographic functions, e.g. AES, DES and RC5. In particular, using block cipher encryption with data-dependent initialization vectors achieve the privacy goal and enable over-the-air transmissions to remain uncompromised, especially in scenarios that may result in the counter being reset in counter-based cipher systems.
H04L 9/32 - Dispositions pour les communications secrètes ou protégéesProtocoles réseaux de sécurité comprenant des moyens pour vérifier l'identité ou l'autorisation d'un utilisateur du système
H04L 9/06 - Dispositions pour les communications secrètes ou protégéesProtocoles réseaux de sécurité l'appareil de chiffrement utilisant des registres à décalage ou des mémoires pour le codage par blocs, p. ex. système DES
58.
Methods and systems for estimating and mitigating OFDM interference
Methods and systems for estimating and mitigating OFDM interference to enable reliable communications with minimal a priori knowledge of the interfering OFDM signal are presented. Embodiments of the present invention hypothesize modulation symbols from a reference signal set, which may not be identical to the interference signal set, and compute a channel sequence to minimize an error between the observed samples and a product of the channel sequence and the hypothesized modulation symbols. The interfering OFDM signal may be estimated and mitigated with no reliance on knowledge of the interference signal set, although this may result in the inability to decode and demodulate the interfering OFDM signal when embodiments of the present invention are extended from single-input single-output systems to multiple-input single-output systems.
H04K 1/10 - Communications secrètes en utilisant deux signaux transmis simultanément ou successivement
H04L 27/28 - Systèmes utilisant des codes à fréquences multiples à émission simultanée de fréquences différentes, chacune représentant un élément de code
H04L 25/03 - Réseaux de mise en forme pour émetteur ou récepteur, p. ex. réseaux de mise en forme adaptatifs
H04B 17/336 - Rapport signal/interférence ou rapport porteuse/interférence
H04L 27/26 - Systèmes utilisant des codes à fréquences multiples
H04L 7/00 - Dispositions pour synchroniser le récepteur avec l'émetteur
H04L 12/26 - Dispositions de surveillance; Dispositions de test
H04L 27/36 - Circuits de modulationCircuits émetteurs
H04L 27/20 - Circuits de modulationCircuits émetteurs
59.
METHODS AND SYSTEMS FOR RELIABLE BROADCASTING USING RE-TRANSMISSIONS
Methods and systems for reliable broadcasting that use re-transmissions, in a multi-hop, time-slotted wireless network, is presented. The methods and systems evaluate the trade-off between power consumption and communication reliability, and are consequently able to provide increasing degrees of robustness for broadcasts in the wireless network. Embodiments of the present invention are able to incrementally use re-transmissions, therein trading-off battery life for an increased message completion rate or a lower packet error rate, for example, in order to reliably broadcast critical or high-priority message network-wide.
H04W 52/48 - Commande de puissance d'émission [TPC Transmission power control] le TPC étant effectué dans des situations particulières lors d'une retransmission après erreur ou en l’absence d’accusé de réception
H04W 72/0446 - Ressources du domaine temporel, p. ex. créneaux ou trames
H04W 72/56 - Critères d’affectation ou de planification des ressources sans fil sur la base de critères de priorité
60.
Methods and systems for reliable broadcasting using re-transmissions
Methods and systems for reliable broadcasting that use re-transmissions, in a multi-hop, time-slotted wireless network, is presented. The methods and systems evaluate the trade-off between power consumption and communication reliability, and are consequently able to provide increasing degrees of robustness for broadcasts in the wireless network. Embodiments of the present invention are able to incrementally use re-transmissions, therein trading-off battery life for an increased message completion rate or a lower packet error rate, for example, in order to reliably broadcast critical or high-priority message network-wide.
H04L 1/18 - Systèmes de répétition automatique, p. ex. systèmes Van Duuren
H04L 12/721 - Procédures de routage, p.ex. routage par le chemin le plus court, routage par la source, routage à état de lien ou routage par vecteur de distance
H04L 12/733 - Sélection d’un chemin de longueur minimum ou de nombre de sauts minimum
H04L 12/26 - Dispositions de surveillance; Dispositions de test
61.
METHODS AND SYSTEMS FOR SECURE AND EFFICIENT FLEXIBLE FREQUENCY HOPPING ACCESS
Secure and efficient methods and systems of providing multiple access interference constraints for frequency hopped spread spectrum communications are presented. The methods and systems leverage a cryptographic keystream generator and iterative indexing into shuffled lists to generate a constrained collision-free frequency hopping sequence. This flexible frequency hopping access (FFHA) can support varying hop frequency and bandwidth resources including secure operation for applications where the number of channels (hopping sequences) exceeds the number of hop frequency resources available.
Secure and efficient methods and systems of providing multiple access interference constraints for frequency hopped spread spectrum communications are presented. The methods and systems leverage a cryptographic keystream generator and iterative indexing into shuffled lists to generate a constrained collision-free frequency hopping sequence. This flexible frequency hopping access (FFHA) can support varying hop frequency and bandwidth resources including secure operation for applications where the number of channels (hopping sequences) exceeds the number of hop frequency resources available.
Methods and systems for reliable broadcasting that use re-transmissions, in a multi-hop, time-slotted wireless network, is presented. The methods and systems evaluate the trade-off between power consumption and communication reliability, and are consequently able to provide increasing degrees of robustness for broadcasts in the wireless network. Embodiments of the present invention are able to incrementally use re-transmissions, therein trading-off battery life for an increased message completion rate or a lower packet error rate, for example, in order to reliably broadcast critical or high-priority message network-wide.
09 - Appareils et instruments scientifiques et électriques
41 - Éducation, divertissements, activités sportives et culturelles
42 - Services scientifiques, technologiques et industriels, recherche et conception
Produits et services
Integrated circuits and circuit board assemblies for use in digital signal processing; software in the field of digital signal processing; digital signal processing apparatus; communications networks; radios (including mobile and digital radios); communications software, apparatus and devices (including those for wireless communications); electronic publications. Training services in the fields of communications software and hardware. Hardware and software engineering and design services in the field of digital signal processing; maintenance services for computer software; computer software technical support services; development of computing algorithms and communications software and hardware.
65.
Methods and systems for improving communication using an alternate link
A method and system for maximizing throughput and minimizing latency in a communication system that supports heterogeneous links is presented. The communication system supports a primary link and an alternate link, and the method and system leverage the alternate link to reduce the overhead transmitted over the primary link, thereby increasing throughput and reducing end-to-end latency. The higher latency alternate link provides a delayed version of an information signal that corresponds to a portion of the information signal that is transmitted on the primary link. The received samples from the primary and alternate links may be used to equalize subsequent portions of the information signal received over the primary link, and may also be used for synchronization, timing recovery, DC offset removal, I/Q imbalance compensation, and frequency-offset estimation.
H04B 10/00 - Systèmes de transmission utilisant des ondes électromagnétiques autres que les ondes hertziennes, p. ex. les infrarouges, la lumière visible ou ultraviolette, ou utilisant des radiations corpusculaires, p. ex. les communications quantiques
Secure and efficient methods and systems of providing multiple access interference constraints for frequency hopped spread spectrum communications are presented. The methods and systems leverage a cryptographic keystream generator and iterative indexing into shuffled lists to generate a constrained collision-free frequency hopping sequence. This flexible frequency hopping access (FFHA) can support varying hop frequency and bandwidth resources including secure operation for applications where the number of channels (hopping sequences) exceeds the number of hop frequency resources available.
The estimation and mitigation of swept-tone interferers includes receiving a composite signal comprising a signal of interest and a swept-tone interferer over an observation bandwidth or a hop bandwidth in a frequency -hopping system. The estimation of the interfering signal may be based on modeling the interferer as a magnitude periodic signal comprising non-overlapping, contiguous epochs, where each epoch may comprise a common pulse shape and a distinct phase rotation. The modeling may be based over the observation bandwidth, the hop bandwidth, or after combining the signal over all the frequency hop bandwidths. The period of the magnitude-periodic signal may be initially determined, and the common pulse shape and each of the distinct phase rotations may then be estimated. These estimates may be used to reconstruct an estimate of the swept-tone interferer, which may be subtracted from the composite signal to generate an interference-mitigated signal of interest.
The estimation and mitigation of swept-tone interferers includes receiving a composite signal comprising a signal of interest and a swept-tone interferer over an observation bandwidth or a hop bandwidth in a frequency-hopping system. The estimation of the interfering signal may be based on modeling the interferer as a magnitude periodic signal comprising non-overlapping, contiguous epochs, where each epoch may comprise a common pulse shape and a distinct phase rotation. The modeling may be based over the observation bandwidth, the hop bandwidth, or after combining the signal over all the frequency hop bandwidths. The period of the magnitude-periodic signal may be initially determined, and the common pulse shape and each of the distinct phase rotations may then be estimated. These estimates may be used to reconstruct an estimate of the swept-tone interferer, which may be subtracted from the composite signal to generate an interference-mitigated signal of interest.
A method and system for maximizing throughput and minimizing latency in a communication system that supports heterogeneous links is presented. The communication system supports a wireless link and an alternate link, and the method and system leverage the alternate link to reduce the overhead transmitted over the wireless link, thereby increasing throughput and reducing end-to-end latency. The higher latency alternate link provides a delayed version of an information signal that corresponds to a portion of the information signal that is transmitted on the wireless link. The received samples from the wireless and alternate links may be used to equalize subsequent portions of the information signal received over the wireless link, and may also be used for synchronization, timing recovery and frequency-offset estimation.
H04W 36/30 - La resélection étant déclenchée par des paramètres spécifiques par des données de mesure ou d’estimation de la qualité des liaisons
H04B 1/38 - Émetteurs-récepteurs, c.-à-d. dispositifs dans lesquels l'émetteur et le récepteur forment un ensemble structural et dans lesquels au moins une partie est utilisée pour des fonctions d'émission et de réception
H04B 10/25 - Dispositions spécifiques à la transmission par fibres
70.
Methods and systems for maximizing throughput for rate-adaptive wireless communication
Throughput for rate-adaptive wireless communication is maximized by accounting for the rate loss associated with selecting a transmission rate as a function of the actual rate supported by the channel. An optimal rate is selected by minimizing a set of average cost functions; each of the average cost functions is based on the delayed LQMs and rate-loss cost functions associated with selecting a candidate transmission rate as a function of a maximum rate supported by the channel.
The estimation and mitigation of swept-tone interferers includes receiving a composite signal comprising a signal of interest and a swept-tone interferer over an observation bandwidth. The estimation of the interfering signal may be based on modeling the interferer over the observation bandwidth as a magnitude periodic signal comprising non-overlapping, contiguous epochs, where each epoch may comprise a common pulse shape and a distinct phase rotation. The period of the magnitude-periodic signal may be initially determined, and the common pulse shape and each of the distinct phase rotations may then be estimated. These estimates may be used to reconstruct an estimate of the swept-tone interferer, which may be subtracted from the composite signal to generate an interference-mitigated signal of interest.
A method for interference estimation and mitigation includes receiving a high-resolution digital signal. The high-resolution digital signal comprises a signal of interest and an interfering signal. An estimate of the interfering signal is generated using a quantizer. The signal of interest is in a quantization noise of the quantizer. An interference-mitigated signal of interest is generated based on a difference of the estimate of the interfering signal and the high-resolution digital signal.
A method and system for flexible radio communications using a wideband radio includes a wideband radio and multiple separable radio definition modules, wherein the wideband radio is configured to operate over a large portion of the radio-frequency (RF) spectrum and each of the radio definition modules are configured to operate in a specific frequency band. The separability of the radio definition modules maintains the capability of the wideband radio to operate over the large portion of the RF spectrum, as well as enabling its robust and reliable operation in a specific frequency band associated with the attached radio definition module.
H04B 1/00 - Détails des systèmes de transmission, non couverts par l'un des groupes Détails des systèmes de transmission non caractérisés par le milieu utilisé pour la transmission
H03J 5/24 - Accord discontinuSélection de fréquences prédéterminéesSélection de bandes de fréquences avec ou sans accord continu dans une ou plusieurs des bandes, p. ex. accord par bouton-poussoir, dispositif d'accord à barillet comportant un certain nombre de circuits d'accord préréglés ou d'éléments d'accord séparés mis sélectivement en circuit, p. ex. pour sélection de bande ou pour sélection de canal de télévision
An apparatus for joint analog and digital interference cancellation includes a receiver configured to receive an analog reference interfering signal on a reference path, and a sum of an analog interference signal and an analog signal of interest on an antenna path. An analog interference canceller may be configured to produce an analog partially interference-cancelled signal using the analog reference interfering signal and the sum of the analog interference signal and the analog signal of interest. A first analog-to-digital converter may be configured to digitize the analog reference interfering signal to produce a digital reference interfering signal. A second analog-to-digital converter may be configured to digitize the analog partially interference-cancelled signal to produce a digital partially interference-cancelled signal. A digital interference canceller may be configured to produce an interference-cancelled signal using the digital reference interfering signal and the digital partially interference-cancelled signal.
H04L 25/08 - Modifications pour réduire les perturbationsModifications pour réduire les effets des défauts de ligne
H04B 1/62 - Détails des systèmes de transmission, non couverts par l'un des groupes Détails des systèmes de transmission non caractérisés par le milieu utilisé pour la transmission pour produire une prédistorsion du signal à l'émission et une correction correspondante à la réception, p. ex. pour améliorer le rapport signal/bruit
H04B 1/10 - Dispositifs associés au récepteur pour limiter ou supprimer le bruit et les interférences
Systems and methods are presented for controlling the peak-to-average-power of a baseband orthogonal-frequency-domain multiplexing (OFDM) signal by designating a subset of the available subcarriers as information-bearing data-subcarriers, and loading remaining subcarriers by symbols that are a function of the symbols loading the data-subcarriers. At the receiver, the data-dependent subcarriers are optionally combined with data-subcarriers to increase error protection.
A system and method is presented for establishing relayed communications involving (1) sending a request message from a source node to a destination node through a plurality of intermediate nodes, (2) receiving the request message at the destination node, and (3) sending an acceptance message from the destination node to the source node through at least a subset of the intermediate nodes, wherein an intermediate node relays the request or acceptance message by receiving the message and re-transmitting the message, and wherein the intermediate node is capable of receiving the message from more than one other intermediate node.
H04J 3/26 - Systèmes multiplex à division de temps dans lesquels l'attribution est indiquée par une adresse dans lesquels l'information et l'adresse sont transmises simultanément
H04L 12/28 - Réseaux de données à commutation caractérisés par la configuration des liaisons, p. ex. réseaux locaux [LAN Local Area Networks] ou réseaux étendus [WAN Wide Area Networks]
G06F 15/16 - Associations de plusieurs calculateurs numériques comportant chacun au moins une unité arithmétique, une unité programme et un registre, p. ex. pour le traitement simultané de plusieurs programmes
H04W 40/28 - Gestion d'informations sur la connectabilité, p. ex. exploration de connectabilité ou mise à jour de connectabilité pour acheminement réactif
H04L 12/751 - Mise à jour ou découverte de la topologie
H04L 12/733 - Sélection d’un chemin de longueur minimum ou de nombre de sauts minimum
H04L 12/707 - Prévention ou récupération du défaut de routage, p.ex. reroutage, redondance de route "virtual router redundancy protocol" [VRRP] ou "hot standby router protocol" [HSRP] par redondance des chemins d’accès
H04W 40/22 - Sélection d'itinéraire ou de voie de communication, p. ex. routage basé sur l'énergie disponible ou le chemin le plus court utilisant la retransmission sélective en vue d'atteindre une station émettrice-réceptrice de base [BTS Base Transceiver Station] ou un point d'accès
H04W 84/18 - Réseaux auto-organisés, p. ex. réseaux ad hoc ou réseaux de détection
H04B 7/26 - Systèmes de transmission radio, c.-à-d. utilisant un champ de rayonnement pour communication entre plusieurs postes dont au moins un est mobile
H04W 16/26 - Amplificateurs de cellules, p. ex. pour tunnels ou effet d'écran créé par des immeubles
H04W 88/04 - Dispositifs terminaux adapté à la retransmission à destination ou en provenance d'un autre terminal ou utilisateur
78.
Methods and systems for conducting relayed communication
Systems and methods are presented for conducting a relayed communication involving a source node, a plurality of intermediate nodes, and at least one destination node, involving at the source node transmitting a signal associated with the relayed communication on a first medium allocation, at each one of the plurality of intermediate nodes relaying the signal onto a next medium allocation in response to receiving the signal as transmitted on at least one medium allocation up to a current medium allocation, and at the at least one destination node receiving the signal as transmitted on at least one medium allocation up to a last medium allocation, wherein at least one node among the plurality of intermediate nodes and the at least one destination node receives signals associated with the relayed communication from multiple intermediate nodes as transmitted on at least one medium allocation.
H04L 12/751 - Mise à jour ou découverte de la topologie
H04B 7/26 - Systèmes de transmission radio, c.-à-d. utilisant un champ de rayonnement pour communication entre plusieurs postes dont au moins un est mobile
H04W 16/26 - Amplificateurs de cellules, p. ex. pour tunnels ou effet d'écran créé par des immeubles
H04W 40/28 - Gestion d'informations sur la connectabilité, p. ex. exploration de connectabilité ou mise à jour de connectabilité pour acheminement réactif
H04W 84/18 - Réseaux auto-organisés, p. ex. réseaux ad hoc ou réseaux de détection
H04W 88/04 - Dispositifs terminaux adapté à la retransmission à destination ou en provenance d'un autre terminal ou utilisateur
79.
Method and system for coordinating access to a barrage relay network
Methods for coordinating access to a barrage relay networks are disclosed. For example, one disclosed method includes: receiving, by a first node, a first message from a second node on a network; suppressing transmission of messages by the first node; receiving, by the first node, a second message corresponding to the first message or waiting a sufficient amount of time without receipt of the second message; reactivating transmission of the messages by the first node.
Methods and systems for on-demand adaptation of packet time-to-live in time-slotted barrage relay networks are disclosed. For example, one disclosed method includes: transmitting a first packet from a first node in a wireless ad hoc network to a second node in the wireless ad hoc network; determining a first path distance, in terms of number of hops, from the first node to the second node, based on the first packet transmission; transmitting a second packet from the second node to the first node, wherein the second packet includes content representing the first path distance; and determining a time-to-live value for subsequent transfers from the first node to the second node, by taking into account the first path distance, wherein the time-to-live value limits the number of hops each packet is allowed to take in subsequent transfers from the first node to the second node.
Methods for coordinating access to a barrage relay networks are disclosed. For example, one disclosed method includes: receiving, by a first node, a first message from a second node on a network; suppressing transmission of messages by the first node; receiving, by the first node, a second message corresponding to the first message or waiting a sufficient amount of time without receipt of the second message; reactivating transmission of the messages by the first node.
Systems and methods are presented for establishing network-wide time synchronization in a time-slotted barrage relay network. In the first phase, nodes obtain coarse, slot-level time synchronization by estimating the time-of-arrival (TOA) of a message that rapidly floods the network via the barrage relay mechanism. In the second phase, fine time synchronization is achieved via a messaging protocol that exchanges TOA information between neighboring nodes.
Systems and methods are presented for topology discovery in a multi-hop ad hoc network. The method operates on two time and distance scales. Nodes periodically transmit messages to their immediate neighbors that enable the discovery of their two-hop network topologies (i.e., within two hops). Less frequently, nodes broadcast messages network-wide that enable the discovery of the global network topology at all nodes. In multi-hop ad hoc network architectures that are characterized by efficient broadcast protocols—e.g., Barrage Relay Networks—the proposed method provides a particularly efficacious means for global topology discovery.
H04L 12/28 - Réseaux de données à commutation caractérisés par la configuration des liaisons, p. ex. réseaux locaux [LAN Local Area Networks] ou réseaux étendus [WAN Wide Area Networks]
H04W 40/24 - Gestion d'informations sur la connectabilité, p. ex. exploration de connectabilité ou mise à jour de connectabilité
H04W 40/04 - Sélection d'itinéraire ou de voie de communication, p. ex. routage basé sur l'énergie disponible ou le chemin le plus court sur la base des ressources nodales sans fil
H04W 40/30 - Gestion d'informations sur la connectabilité, p. ex. exploration de connectabilité ou mise à jour de connectabilité pour acheminement proactif
A method of decoding channel outputs using an iterative decoder to provide hard decisions on information bits includes activating each SISO decoder of the iterative decoder to provide soft-decisions associated with the information bits. The method also includes computing a fidelity estimate and stopping decoding based on the fidelity estimate.
G06F 11/08 - Détection ou correction d'erreur par introduction de redondance dans la représentation des données, p. ex. en utilisant des codes de contrôle
The disclosure proposes bit-error-rate (BER) and symbol-error-rate (SER) estimation techniques and its application to incremental-redundancy and rate-adaptation for modern-coded hybrid-ARQ systems. In particular, BER/SER estimators are proposed based on iterative refinement of mixture-density modeling of the bit/symbol decision metrics. For hybrid-ARQ systems, rate-adaptation functions are proposed based on BER/SER estimators for failed transmissions. Methods are disclosed for code-rate selection based on successfully decoded blocks as well as incremental parity size selection for retransmission of failed blocks Techniques disclosed here apply to forward-error-correction codes employed for digital data communication systems.
A method and system are provided in a wireless communications system comprising a plurality of nodes (users) working cooperatively. The system provides cooperative diversity by allowing nodes to actively share their antennas and other resources to obtain spatial diversity. The nodes receive the same message (information data) from a common source. Each node enhances the reliability of the message with a modern forward error correction (FEC) code, converts the FEC encoded message into an ensemble of symbols, divides the ensemble of symbols into packets, modulates, dithers and transmits the packets to a receiving node. The dithering process is performed by varying the signal amplitude, phase, frequency and/or symbol timing of the modulated packets. A unique dither pattern is assigned to each node. The receiving node captures a composite signal comprising the transmitted packets of all or most of the transmitting nodes in the cooperative communications system. Because the transmitted packets are dithered independently in phase and/or amplitude, spatial diversity is transformed into temporal diversity.
A system and method is presented for establishing relayed communications involving (1) sending a request message from a source node to a destination node through a plurality of intermediate nodes, (2) receiving the request message at the destination node, and (3) sending an acceptance message from the destination node to the source node through at least a subset of the intermediate nodes, wherein an intermediate node relays the request or acceptance message by receiving the message and re-transmitting the message, and wherein the intermediate node is capable of receiving the message from more than one other intermediate node.
H04L 12/28 - Réseaux de données à commutation caractérisés par la configuration des liaisons, p. ex. réseaux locaux [LAN Local Area Networks] ou réseaux étendus [WAN Wide Area Networks]
H04J 3/26 - Systèmes multiplex à division de temps dans lesquels l'attribution est indiquée par une adresse dans lesquels l'information et l'adresse sont transmises simultanément
H04J 3/00 - Systèmes multiplex à division de temps
G06F 15/16 - Associations de plusieurs calculateurs numériques comportant chacun au moins une unité arithmétique, une unité programme et un registre, p. ex. pour le traitement simultané de plusieurs programmes
88.
METHODS AND APPARATUS FOR NETWORK COMMUNICATION VIA BARRAGE RELAY ONTO AN INDEPENDENT MEDIUM ALLOCATION
Systems and methods are presented for conducting a relayed communication involving a source node, a plurality of intermediate nodes, and at least one destination node, involving at the source node transmitting a signal associated with the relayed communication on a first medium allocation, at each one of the plurality of intermediate nodes relaying the signal onto a next medium allocation in response to receiving the signal as transmitted on at least one medium allocation up to a current medium allocation, and at the at least one destination node receiving the signal as transmitted on at least one medium allocation up to a last medium allocation, wherein at least one node among the plurality of intermediate nodes and the at least one destination node receives signals associated with the relayed communication from multiple intermediate nodes as transmitted on at least one medium allocation.
Systems and methods are presented for conducting a relayed communication involving a source node, a plurality of intermediate nodes, and at least one destination node, involving at the source node transmitting a signal associated with the relayed communication on a first medium allocation, at each one of the plurality of intermediate nodes relaying the signal onto a next medium allocation in response to receiving the signal as transmitted on at least one medium allocation up to a current medium allocation, and at the at least one destination node receiving the signal as transmitted on at least one medium allocation up to a last medium allocation, wherein at least one node among the plurality of intermediate nodes and the at least one destination node receives signals associated with the relayed communication from multiple intermediate nodes as transmitted on at least one medium allocation.
Embodiments of the present invention provide Forward Error Correcting Code encoders and decoder structures that use DRAM in their memory designs. DRAM is a very attractive memory options in many electronic systems due to the high memory density provided by DRAM. However, the DRAM is typically not included in ASIC or FPGA implementations of encoders and decoders due to complex refresh requirements of DRAM that are required to maintain data stored in DRAM and may interfere with user access to the memory space during refresh cycles. Embodiments of the present invention provide FECC encoder and decoder structures that are implemented using DRAM that do not require complex refresh operations to be performed on the DRAM to ensure data integrity. Accordingly, embodiments of the present invention maximize memory density without the added complexity of introduced by the refresh requirements of DRAM.
Embodiments of the present invention provide Forward Error Correcting Code encoders and decoder structures that use DRAM in their memory designs. DRAM is a very attractive memory options in many electronic systems due to the high memory density provided by DRAM. However, the DRAM is typically not included in ASIC or FPGA implementations of encoders and decoders due to complex refresh requirements of DRAM that are required to maintain data stored in DRAM and may interfere with user access to the memory space during refresh cycles. Embodiments of the present invention provide FECC encoder and decoder structures that are implemented using DRAM that do not require complex refresh operations to be performed on the DRAM to ensure data integrity. Accordingly, embodiments of the present invention maximize memory density without the added complexity of introduced by the refresh requirements of DRAM.
SAM is a very attractive memory option for systems due to its higher speed and reduced area when compared to RAM. However it is generally not used in implementations of FECCs due to its limitation to sequential accesses. According to the present invention, Forward Error Correcting Code encoder and decoder structures are shown to allow the use of SAM in their memory designs. Thus SAM is utilized in FECC implementations to achieve better area efficiency for the same amount of memory as well as higher throughput for the hardware implementations.
SAM is a very attractive memory option for systems due to its higher speed and reduced area when compared to RAM. However it is generally not used in implementations of FECCs due to its limitation to sequential accesses. According to the present invention, Forward Error Correcting Code encoder and decoder structures are shown to allow the use of SAM in their memory designs. Thus SAM is utilized in FECC implementations to achieve better area efficiency for the same amount of memory as well as higher throughput for the hardware implementations.
Methods, apparatuses, and systems are presented for extracting information from a received signal resulting from a process capable of being represented as a finite state machine having a plurality of states, wherein transitions between the states can be represented by a trellis spanning a plurality of time indices, involving calculating branch metrics taking into account the received signal, calculating state metrics at each time index by taking into account the branch metrics and using a pipelined process, wherein the pipelined process is used to calculate state metrics at a first time index, wherein the pipelined process is then used to calculate state metrics at one or more non-adjacent time indices, and wherein the pipelined process is then used to calculate state metrics at an adjacent time index, and generating at least one output taking into account state metrics for states associated with at least one selected path through the trellis.
H03M 13/03 - 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
Methods, apparatuses, and systems are presented for performing data encoding involving receiving a sequence of data bits, encoding the sequence of data bits in accordance with a parity check matrix (H-matrix) to generate a sequence of encoded bits, wherein the H-matrix is capable of being partitioned into a first matrix and a second matrix, the first matrix being a dual-diagonal matrix, the second matrix comprising one or more vertically stacked sub-matrices, each sub-matrix consisting of a plurality of columns, each column having a column weight of no more than 1, wherein the second matrix is capable of being expressed as a product of a parity check matrix, an interleaver permutation matrix, and a repeat block matrix, and the interleaver permutation matrix satisfies a clash-free interleaver constraint, and outputting the sequence of encoded bits.
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
96.
Method and apparatus for communications using improved turbo like codes
Methods, apparatuses, and systems are presented for performing data encoding involving encoding data bits according to an outer convolutional code to produce outer encoded bits, processing the outer encoded bits using an interleaver and a single parity check (SPC) module to produce intermediate bits, encoding the intermediate bits according to an inner convolutional code to produce inner encoded bits, processing the inner encoded bits using a puncture module to produce punctured bits, and combining the data bits and the punctured bits to produce encoded outputs. Methods, apparatuses, and systems are also presented for performing data decoding based on soft channel metrics derived from a channel using various iterative techniques.
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 13/03 - 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
97.
Method and apparatus for communications using turbo like codes
The present invention relates to methods, apparatuses, and systems for performing data encoding involving encoding data bits according to an outer convolutional code to produce outer encoded bits processing the outer encoded bits using an interleaver and a logical unit to produce intermediate bits, wherein the logical unit receives a first number of input bits and produces a second number of corresponding output bits, the second number being less than the first number, and wherein the logical unit takes each of the first number of input bits into account in producing the second number of output bits, encoding the intermediate bits according to an inner convolutional code to produce inner encoded bits, wherein the inner convolutional code is characterized by at least two states, and combining the data bits and the inner encoded bits to produce encoded outputs.
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
98.
METHOD AND APPARATUS FOR COMMUNICATIONS USING TURBO LIKE CODES
The present invention relates to methods, apparatuses, and systems for performing data encoding involving encoding data bits according to an outer convolutional code to produce outer encoded bits processing the outer encoded bits using an interleaver and a logical unit to produce intermediate bits, wherein the logical unit receives a first number of input bits and produces a second number of corresponding output bits, the second number being less than the first number, and wherein the logical unit takes each of the first number of input bits into account in producing the second number of output bits, encoding the intermediate bits according to an inner convolutional code to produce inner encoded bits, wherein the inner convolutional code is characterized by at least two states, and combining the data bits and the inner encoded bits to produce encoded outputs.
H03M 13/23 - 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 des codes de convolution, p. ex. codes d'unité de mémoire
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
H04L 1/22 - Dispositions pour détecter ou empêcher les erreurs dans l'information reçue en utilisant un appareil en excédent pour accroître la fiabilité
09 - Appareils et instruments scientifiques et électriques
42 - Services scientifiques, technologiques et industriels, recherche et conception
Produits et services
Integrated circuits and circuit board assemblies for use in digital signal processing; software in the field of digital signal processing Hardware and software engineering and design services in the field of digital signal processing
