A method of providing a recovery channel for a common transmission network of remote devices comprising encoding data that contains information about a primary carrier signal, modulating the encoded information, spreading, the modulated encoded information such that a secondary carrier signal results, combining, the spread secondary carrier with the primary carrier signal such that the spread secondary carrier signal occupies at least a portion of a bandwidth of the bandwidth pool, transmitting the combined primary and secondary carrier signals across a communications link having a plurality of remote carrier signals also being transmitted across the communications link to a remote receiver and sharing a same bandwidth pool (or multiple bandwidth pools), and reestablishing the communications link with the primary carrier signal after a loss of the communications link using the information about the primary carrier signal contained in the secondary carrier signal to recover one or more network configuration parameters.
A method of seamless antenna handover comprising transmitting at least one of a handover trigger packet and a handover synchronization packet (HSP) by a transmitter to a first and a second repeating relay, the first repeating relay configured to transmit a data signal to a first modem at a remote receiver and the second repeating relay configured to transmit the data signal to a second modem at the remote receiver, receiving, by the first and second modems at the remote receiver, the data signal and the at least one of the handover trigger packet and the HSP from the first and second repeating relays, respectively, and activating one of the first and second modems and deactivating the other of the first and second modems in response to receiving the at least one of the handover trigger packet and the HSP.
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
H01Q 1/27 - Adaptation pour l'utilisation dans ou sur les corps mobiles
H01Q 1/28 - Adaptation pour l'utilisation dans ou sur les avions, les missiles, les satellites ou les ballons
09 - Appareils et instruments scientifiques et électriques
Produits et services
Satellite communications network platform in the nature of computer hardware and software for transmission, reception, monitoring, control and bandwidth management of network traffic including at least data, signals, images and sounds
5.
SYSTEM AND METHOD FOR DISTORTION-POWER ADAPTED ADAPTIVE PRE-DISTORTION
A method of generating Nth order product predistortion coefficients for use by a linearizer in a non-linear communications system comprising receiving an input signal by a processor, applying, by the processor, a frequency domain-based adaptation algorithm by measuring Nth order products of an output signal of the system and iteratively adjusting a predistortion coefficient of a predistorter until the Nth order product is substantially equal to a predetermined minimum value.
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 7/005 - Commande de la transmissionÉgalisation
H03F 1/32 - Modifications des amplificateurs pour réduire la distorsion non linéaire
6.
RAPID CARRIER ACQUISITION FOR DIGITAL COMMUNICATION RECEIVER
A method of rapid non-data aided carrier signal acquisition for a low symbol rate carrier signal, comprising receiving and converting an analog intermediate frequency carrier to a digital carrier signal, down-converting the signal to substantially baseband, reducing a sampling rate of the digital carrier signal using a decimation filter, determining a highest Fast Fourier Transform (FFT) based on a result of one or more FFT's generated by an FFT module using a peak finder, selecting an input source for the FFT module using a multiplexer, generating a frequency estimate of the digital carrier signal using a walking coarse detector, tuning a carrier recovery loop (CRL) based on the frequency estimate generated by the walking coarse detector, determining a final carrier frequency offset estimate using a result of the FFT module, modulation removal, and the peak finder, and programming an oscillator within the CRL to the final carrier frequency offset estimate.
A method of detecting FN code synchronization for a DSSS signal comprising receiving a DSSS data signal of data frames comprised of I and Q symbols, at least a portion of each data frame comprising a unique word, demodulating the data signal into I and Q chip samples, filtering the I and Q chip samples and outputting the filtered I and Q chip samples to a chip stream controller which outputs the plurality of chip streams to a correlation matrix that correlates the plurality of chip streams with the chipped unique word and outputs a correlated data stream, A plurality of FFTs is run on the correlated output data stream and a processor searches for a maximum frequency bin power of each FF'T. A PN synchronization detector searches for a maximum frequency bin power among the plurality of FFT runs and determines whether PN synchronization is present.
A method of reducing packet loss resulting from header compression during data transmission comprising of calculating, by a transmitter, the difference between one or more delta fields of each packet among a plurality of packets and a base frame of data wherein for at least a portion of the packets, the base frame is a packet other than a packet immediately preceding the packet for which the difference is calculated, encoding the difference and compressing the plurality of packets using the transmitter; transmitting, using the transmitter, the plurality of compressed packets and an uncompressed full-header packet through a communications channel to a receiver, receiving the plurality of compressed packets and the uncompressed full-header packet by the receiver, and decompressing, by the receiver, the plurality of compressed packets using the difference between the one or more delta fields of each packet among the plurality of compressed packets and the base frame.
09 - Appareils et instruments scientifiques et électriques
Produits et services
Electric or electronic sensors for monitoring and analyzing wireless network communication feeds from satellite carriers, cable and wireless networks, and displaying electromagnetic radiation of the wireless network communication feeds arranged in a progressive series according to wavelength; Scientific apparatus, namely, spectrometers and parts and fittings therefor
10.
EMBEDDED META-CARRIER WITH SPREAD SPECTRUM FOR PERIODIC-BURST CARRIERS VIA OVERLAID CARRIERS
A method for identifying the presence of an electronic transmission comprising detecting, by a detecting device, the presence of a burst of electromagnetic energy that results from the presence of an original carrier signal and transmitting, by a transmitting device, a spread spectrum meta-carrier signal within a portion of a bandwidth of the original carrier signal, wherein the meta-carrier signal contains information about the original carrier signal and is transmitted such that the meta-carrier signal occupies at least a portion of a bandwidth of the original earner signal during the presence of the burst of electromagnetic energy.
Methods of dynamically modeling performance of a communications network that may include modeling a communications network using a processor by performing a link budget analysis (LBA) for a configuration of the communications network, receiving a plurality of layers of real-time information about the communications network, iteratively performing additional LBAs using one or more of the layers of real-time information from among the plurality of layers of real-time information, multi-dimensionally co-modeling a matrix comprising results of the iteratively performed additional LBAs, and determining one or more final communications network configuration parameters based on the multi- dimensionally co-modeled matrix.
COMTECH SATELLITE NETWORK TECHNOLOGIES, INC. (USA)
Inventeur(s)
Lang, Howard
Boni, Jeff
Johnson, Byron
Lee, Herman
Lee, John
Mayr, John H.
Nordberg, Mark P.
Tu, Ker-Ren
Vestal, Christopher
Abrégé
A method and system for monitoring a packet network by using call detail records (CDRs) are disclosed. The method first receives at least one call detail record (CDR) at a completion of a call from at least one voice gateway router that serviced said call and analyzes said at least one CDR. The method then monitors at least one performance parameter in accordance with said at least one CDR.
A method of reducing adjacent satellite interference, the method comprising monitoring, by a processor, a power spectral density (PSD) of a signal transmitted by a remote transmitter, determining, by the processor, that the PSD of the signal transmitted by the remote transmitter is above a predetermined level, and reducing the PSD of the signal transmitted by the remote transmitter by adjusting at least one of a spread spectrum spreading factor, a power level, a modulation factor, and a forward error correction (FEC) rate using a modulator while maintaining a constant spectral allocation and center frequency of the signal.
A method of hitless switching over a communications link, the method comprising transmitting, by a first modulator to a remote receiver, a first carrier signal having a first center frequency, enabling, by a second modulator to the remote receiver, transmission of a second carrier signal having a second center frequency while the first modulator is transmitting the first carrier signal, increasing, through the second modulator, a power level of the second carrier signal while the first carrier signal is transmitting, simultaneously decreasing, through the first modulator, a power level of the first carrier signal while the power level of the second carrier signal is increasing, and disabling transmission of the first carrier signal to the remote receiver when the power level of the second carrier signal reaches a predetermined level.
H04J 4/00 - Systèmes multiplex combinés à division de temps et à division de fréquence
H04W 52/42 - Commande de puissance d'émission [TPC Transmission power control] le TPC étant effectué dans des situations particulières dans des systèmes à diversité de temps, d'espace, de fréquence ou de polarisation
15.
METHOD AND SYSTEM FOR OPTIMIZING PERFORMANCE WITH HITLESS SWITCHING FOR FIXED SYMBOL RATE CARRIERS
A method of controlling bandwidth allocation over a communications link comprising detecting, by a processor, a change in a power level of a composite signal transmitted by a transmitter, the composite signal comprising a plurality of carrier signals and having a constant center frequency and spectral allocation, adjusting at least one of a modulation factor and a forward error correction (FEC) rate of one or more of the plurality of carrier signals using a modulator, in response to the change in power level to maintain a predetermined data rate and spectral allocation of the composite signal, and maintaining, by the modulator, an uninterrupted communications link between the transmitter and a remote receiver while the at least one of the modulation factor and the FEC rate is adjusted.
A method of provisioning a communications link between remote terminals within a hub-spoke network comprising receiving, by a first remote terminal, information about a second remote terminal from a hub, selecting, by the first remote terminal, a modulation factor, coding rate, symbol rate, center frequency, and power level based on the information received about the second remote terminal, transmitting, by the first remote terminal, a signal using at least one of the selected modulation factor, coding rate, symbol rate, center frequency, and power level, to the second remote terminal such that a communications link is created, and adjusting the modulation factor, coding rate, symbol rate, center frequency, or power level of the transmitted signal such that performance of the link is increased while maintaining a presence of the link.
H04L 12/829 - Commande adaptative, à la source ou aux nœuds intermédiaires, sur réception d'avis de congestion, p.ex. X-on X-off envoyée par le point de destination
A method of transmitting telecommunications data comprising modulating first and second data signals, selecting transmit powers first and second terminals to achieve a predetermined power equivalent bandwidth (FEB) through an un-attenuated, transmitting the first data signal to the second terminal and the second data signal to the first terminal through a remote receiver, measuring a total received signal-to-noise ratio of the first and second data signals and a total received signal-to-noise ratio received at the second and first terminals, respectively, measuring a signal-power density ratio between the first and second signals, determining a ratio of excess uplink to downlink losses based a rain model parameter and operating frequency, calculating excess uplink and downlink losses relative an optimized, un- attenuated telecommunications channel, and changing a transmit power of a terminal such that the predetermined FEB is maintained when at least one of the signals experiences attenuation.
H04W 52/24 - Commande de puissance d'émission [TPC Transmission power control] le TPC étant effectué selon des paramètres spécifiques utilisant le rapport signal sur parasite [SIR Signal to Interference Ratio] ou d'autres paramètres de trajet sans fil
18.
A METHOD AND SYSTEM FOR OPTIMIZING DATA THROUGHPUT PERFORMANCE FOR DYNAMIC LINK CONDITIONS USING ADAPTIVE CODING AND MODULATION (ACM) AND DYNAMIC SINGLE CHANNEL PER CARRIER (DSCPC) TECHNIQUES
A method of maintaining a data rate of a telecommunications link that involves, in a particular embodiment, modulating a carrier signal, encoding the carrier signal, and dynamically controlling a bandwidth of the carrier signal by changing a symbol rate of the carrier signal such that a data rate of the carrier signal remains substantially equal to a predetermined data rate when the carrier signal is transmitted to a remote receiver.
H04J 3/16 - Systèmes multiplex à division de temps dans lesquels le temps attribué à chacun des canaux au cours d'un cycle de transmission est variable, p. ex. pour tenir compte de la complexité variable des signaux, pour adapter le nombre de canaux transmis
H04L 29/00 - Dispositions, appareils, circuits ou systèmes non couverts par un seul des groupes
A method of signal distortion correction in a telecommunications channel, the method comprising modeling predicted signal distortion of an electromagnetic (EM) signal using one or more non-linearity model parameters of a signal distortion model, calculating and transferring one or more coefficients of the one or more non-linearity model parameters to a signal transmit location, pre-distorting the signal using an inverse function based on the one or more non-linearity model parameters, and transmitting the pre-distorted signal over the telecommunications channel containing a non-linear amplifier to a remote receiving device.
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
21.
META-CARRIER EMBEDDING TECHNIQUE WITH IMPROVED PERFORMANCE FOR BPSK, MSK, AND O-QPSK MODULATION
A method of embedding information within a burst carrier signal, the method comprising modulating meta-data using a modulator such that a meta-carrier signal results, lowering a Power Spectral Density (PSD) of the meta-carrier signal by Direct Sequence Spread Spectrum (DSSS) chipping the meta-carrier signal using a linear Pseudo-Random Number (PRN) sequence, embedding one or more modulated symbols of the meta-carrier signal within an unused portion of one or more quadrants of a modulation constellation of a burst carrier signal such that a composite carrier signal results, and synchronously transmitting the composite carrier signal using a transmitter such that symbols of the meta-carrier signal are synchronized with symbols of the burst carrier signal.
A method of embedding and transmitting a meta-data message in an original burst carrier signal for message reassembly comprising spreading a meta-carrier signal using a Direct Sequence Spread Spectrum (DSSS) spreading code having a Pseudo-Random Noise (PRN) spreading code sequence, the meta-carrier signal comprising one or more bits of meta-data information about the original burst carrier signal, lowering a power spectral density of the meta- carrier signal using the PRN spreading code such that interference with the original signal is reduced, combining the original burst carrier and the meta-carrier signals using a modulator such that a composite burst carrier signal results wherein the meta-carrier signal occupies at least a portion of a bandwidth of the original carrier, and transmitting the composite burst carrier using a transmitter over a telecommunications channel in which only one burst carrier signal is expected to be present within a predetermined frequency bandwidth at a point in time.
A method of reducing signal correlation in a symmetrical adaptive canceller link comprising spectrally inverting one of a first carrier signal and a second carrier signal by causing a spectral inversion of one of the first and second carrier signals using a modulator, transmitting the first and second carrier signals within a bandwidth to a remote receiver using a transmitting device such that a composite carrier signal results, and cancelling at least one of the first carrier signal from the composite carrier signal using a cancellation technique such that the second carrier signal results on one end of the link and the second carrier signal from the composite carrier signal using a cancellation technique such that the first carrier signal results on the opposite end of the link.
A method for encrypting an information carrier comprising generating a sequence of data using a sequence generator, modulating, using a first modulator an output from the sequence generator such that an interference signal results, encoding the interference generator's synchronization information using an encoder, modulating, using a second modulator, the encoded synchronization information such that a synchronization carrier signal results, spreading the synchronization carrier signal using a spreader such that a spread sub-carrier synchronization signal results, and combining the modulated information carrier signal, interference signal, and spread sub-carrier synchronization signal using a signal combiner such that a composite signal results, the interference signal having one or more signal characteristics that results in obfuscation of the information carrier signal when the information carrier signal and interference signal are combined.
A method for remotely and dynamically controlling adjacent satellite interference comprising monitoring one or more off-axis signals emitted by one or more remote transmitters; determining whether one or more of the off-axis signals is creating adjacent satellite interference (ASI), off axis emissions and inband interference that is higher than a predetermined level of acceptable interference, and transmitting a control signal to at least one of the one or more remote transmitters in response to the determination that the one or more off-axis signals is creating interference that is higher than the predetermined level of acceptable interference, the control signal initiating an adjustment to one or more transmission parameters of the one or more remote transmitters such that interference resulting from the one or more off-axis signals emitted by the one or more remote transmitters is reduced or eliminated.
A communication method for embedding a meta-carrier under an original carrier signal with reduced or minimal original carrier signal degradation, the method comprising transmitting an original carrier signal and transmitting a meta-carrier signal separate from the original carrier signal, wherein the meta-carrier signal contains information about an original carrier signal, is extractable under an interfered condition, and is transmitted such that the meta-carrier signal occupies at least a portion of a bandwidth of the original carrier signal.
09 - Appareils et instruments scientifiques et électriques
40 - Traitement de matériaux; recyclage, purification de l'air et traitement de l'eau
42 - Services scientifiques, technologiques et industriels, recherche et conception
Produits et services
Modems; and Satellite Transmitters and Receivers Custom manufacture of satellite communication system equipment for others Design for others in the field of satellite communications; and Research and development and consultation related thereto in the field of satellite communications
09 - Appareils et instruments scientifiques et électriques
Produits et services
Computer software and computer hardware to allow more than one satellite or wireless carrier to share the same bandwidth; This is applicable to point-to-point communication circuits as well as point-to-multipoint communication circuits
