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182results about "Combined modulated pulse demodulation" patented technology
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Transmitter predistortion circuit and method therefor
InactiveUS7469491B2Compensation DistortionMultiple-port networksPower amplifiersNonlinear distortionData stream
A digital communications transmitter (100) includes a digital linear-and-nonlinear predistortion section (200, 1800, 2800) to compensate for linear and nonlinear distortion introduced by transmitter-analog components (120). A direct-digital-downconversion section (300) generates a complex digital return-data stream (254) from the analog components (120) without introducing quadrature imbalance. A relatively low resolution exhibited by the return-data stream (254) is effectively increased through arithmetic processing. Distortion introduced by an analog-to-digital converter (304) may be compensated using a variety of adaptive techniques. Linear distortion is compensated using adaptive techniques with an equalizer (246) positioned in the forward-data stream (112). Nonlinear distortion is then compensated using adaptive techniques with a plurality of equalizers (226) that filter a plurality of orthogonal, higher-ordered-basis functions (214) generated from the forward-data stream (112). The filtered-basis functions are combined together and subtracted from the forward-data stream (112).
Owner:CRESTCOM INC
Multiplexing scheme in a communication system
ActiveUS20070177631A1Interference minimizationPerformance maximizationSimultaneous amplitude and angle modulationSimultaneous amplitude and angle demodulationMultiplexingCommunications system
A method for multiplexing communication resources to multiple users in a communication system having no network resource planning. The method includes the steps of: generating a generic time-frequency (T-F) mapping pattern (TFPgeneric), generating a set of orthogonal T-F mapping patterns from said generic T-F mapping pattern (TFPgeneric), performing a random variable cyclic offsetting of said set of orthogonal T-F mapping patterns in each transmission time interval (TTI), and allocating the orthogonal T-F mapping patterns to the one or more users and / or traffic channels in each TTI. A transmitter for executing said multiplexing method, and a system including such transmitters, are also disclosed.
Owner:HUAWEI TECH CO LTD
Transmitter predistortion circuit and method therefor
InactiveUS20050163252A1Easy to optimizeCompensation DistortionMultiple-port networksPower amplifiersNonlinear distortionData stream
A digital communications transmitter (100) includes a digital linear-and-nonlinear predistortion section (200, 1800, 2800) to compensate for linear and nonlinear distortion introduced by transmitter-analog components (120). A direct-digital-downconversion section (300) generates a complex digital return-data stream (254) from the analog components (120) without introducing quadrature imbalance. A relatively low resolution exhibited by the return-data stream (254) is effectively increased through arithmetic processing. Distortion introduced by an analog-to-digital converter (304) may be compensated using a variety of adaptive techniques. Linear distortion is compensated using adaptive techniques with an equalizer (246) positioned in the forward-data stream (112). Nonlinear distortion is then compensated using adaptive techniques with a plurality of equalizers (226) that filter a plurality of orthogonal, higher-ordered-basis functions (214) generated from the forward-data stream (112). The filtered-basis functions are combined together and subtracted from the forward-data stream (112).
Owner:CRESTCOM INC
Adaptive equalizer training circuit, modem apparatus and communication apparatus
InactiveUS6928110B2Reduce the amount of errorReduce the amount of calculationMultiple-port networksTransmission control/equlisationModem deviceRenewal time
A training circuit for training a tap coefficient of an adaptive equalizer that performs error calculations in a training process and updating of the tap coefficient in a time area and thereby makes the tap coefficient converge stably in a short time.
Owner:MATSUSHITA GRAPHIC COMM SYST INC
Method and apparatus for detecting and quantifying impairments in QAM signals
InactiveUS7142609B2The result is accurateSimple principleSimultaneous amplitude and angle modulationError detection/prevention using signal quality detectorCommunications systemIn-phase and quadrature components
A method for detecting and quantifying impairments of a received communication signal of a QAM data communication system represented by a plurality of ideal values. The method includes storing a statistically significant number of a plurality of received points of the signal for each ideal value corresponding to a plurality of groups of said plurality of ideal values. The received points are defined by an in-phase and a quadrature components in a coordinate system in which a first axis is the in-phase axis and a second axis is a quadrature axis. The components have corresponding ideal components from their respective ideal value. Each group corresponds to respective impairments and is specific to the same.
Owner:VEEX
Magnetic field communication method for managing node with low power consumption
ActiveUS20110243267A1Reduce power consumptionEnergy efficient ICTCombined modulated pulse demodulationArea networkBpsk modulation
A magnetic field communication method is provided for managing node with low power consumption which enhances performance and efficiency of a magnetic field area network in the low frequency region. The magnetic field communication method for managing node with low power consumption of the present invention is accomplished in a low-frequency wireless network that is comprised of a MFAN-C and at least one MFAN-N wherein a physical layer is comprised of a preamble, a header, and a payload, and the preamble is comprised of a wake-up sequence and a synchronization sequence. The wake-up sequence is only added to the preamble of the frame that is transmitted from the MFAN-C when the MFAN-N is being activated from the hibernation mode. The wake-up sequence is modulated using ASK modulation, and the synchronization sequence is modulated using BPSK modulation.
Owner:HYUNDAI MOBIS CO LTD
Distortion-managed digital RF communications transmitter and method therefor
ActiveUS20050163250A1Improved distortion-managedImprove accuracySimultaneous amplitude and angle modulationAmplifier modifications to reduce non-linear distortionNonlinear distortionData stream
A digital communications transmitter (100) includes a digital linear-and-nonlinear predistortion section (200) to compensate for linear and nonlinear distortion introduced by transmitter-analog components (120). A direct-digital-downconversion section (300) generates a complex digital return-data stream (254) from the analog components (120) without introducing quadrature imbalance. A relatively low resolution exhibited by the return-data stream (254) is effectively increased through arithmetic processing. Linear distortion is first compensated using adaptive techniques with an equalizer (246) positioned in the forward-data stream (112). Nonlinear distortion is then compensated using adaptive techniques with a plurality of equalizers (226) that filter a plurality of orthogonal, higher-ordered-basis functions (214) generated from the forward-data stream (112). The filtered-basis functions are combined together and subtracted from the forward-data stream (112).
Owner:CRESTCOM INC
Predistortion circuit and method for compensating A/D and other distortion in a digital RF communications transmitter
InactiveUS20050163251A1Compensation DistortionReduce errorsPower amplifiersCombined modulated pulse demodulationNonlinear distortionData stream
A digital communications transmitter (100) includes a digital linear-and-nonlinear predistortion section (200, 1800) to compensate for linear and nonlinear distortion introduced by transmitter-analog components (120). A direct-digital-downconversion section (300) generates a complex digital return-data stream (254) from the analog components (120) without introducing quadrature imbalance. A relatively low resolution exhibited by the return-data stream (254) is effectively increased through arithmetic processing. Distortion introduced by an analog-to-digital converter (304) may be compensated using a variety of adaptive techniques. Linear distortion is compensated using adaptive techniques with an equalizer (246) positioned in the forward-data stream (112). Nonlinear distortion is then compensated using adaptive techniques with a plurality of equalizers (226) that filter a plurality of orthogonal, higher-ordered-basis functions (214) generated from the forward-data stream (112). The filtered-basis functions are combined together and subtracted from the forward-data stream (112).
Owner:CRESTCOM INC
OQPSK phase and timing detection
InactiveUS6075408ACombined modulated pulse demodulationCarrier regulationPhase shiftedComputer science
A method and an apparatus for generating an error estimate as input for an error recovery loop of a demodulator which receives an offset quadrature phase shift keyed (OQPSK) signal having a symbol interval. The method comprises the following operations: (a) receiving at least four consecutive complex samples z-+E,fra 1 / 2+EE , z0, z+E,fra 1 / 2+EE and z1 obtained by sampling the OQPSK signal at half the symbol interval; and (b) computing the error estimate based on the complex samples z-+E,fra 1 / 2+EE , z0, z+E,fra 1 / 2+EE and z1.
Owner:IBM CORP
Methods and apparatus for encoding information in a signal by spectral notch modulation
ActiveUS20070025456A1Increasing signal bandwidth and transmit power and data rateEasy to useCombined modulated pulse demodulationAngle modulationTime domainFrequency spectrum
A spectral notch modulation technique for encoding information in a signal involves transforming the signal into the frequency domain via a fast Fourier transform (FFT) of length N, such that the signal is represented by N frequency bins, selectively nulling M of the N frequency bins, where nulled combinations of M frequency bins respectively correspond to encoded information bits, transforming the selectively nulled signal to the time domain via an inverse FFT, and transmitting the selectively nulled signal. At the receiving end, the signal is demodulated to recover the encoded information by transforming the signal into the frequency domain via a fast Fourier transform (FFT) of length N, identifying the set of M nulled frequency bins among the N frequency bins, and converting the set of M nulled frequency bins to corresponding information bits.
Owner:HARRIS GLOBAL COMM INC
Coarse phase estimation for highly-spectrally-efficient communications
Owner:AVAGO TECH INT SALES PTE LTD
Coded digital modulation method for communication system
InactiveUS20060209982A1Increases transmission spectral efficiencyImprove power efficiencySimultaneous amplitude and angle modulationSimultaneous amplitude and angle demodulationHigh power amplifierDigital signal
A new class of 16-ary Amplitude and Phase Shift Keying (APSK) coded modulations, called double-ring APSK modulation, based on an amplitude and phase shift keying constellation in which the locations of the digital signals to be encoded are placed on two concentric rings of equally spaced signal points. The APSK constellation parameters are optimised so as to pre-compensate the impact of non-linearities. The new modulation scheme is suited for being used with different coding schemes. It is shown that, for the same coding scheme, pre-distorted double-ring APSK modulation significantly outperforms classical 16-QAM and 16-PSK over a typical satellite channel, due to its intrinsic robustness against the high power amplifier non-linear characteristics. The proposed coded modulation scheme is shown to provide a considerable performance advantage for future satellite multi-media and broadcasting systems.
Owner:EUROPEAN SPACE AGENCY
Distortion-managed digital RF communications transmitter and method therefor
ActiveUS7099399B2Improved distortion-managedImprove accuracySimultaneous amplitude and angle modulationAmplifier modifications to reduce non-linear distortionNonlinear distortionData stream
Owner:CRESTCOM INC
Method and apparatus for distributed space-time coding in wireless radio networks
ActiveUS20070281633A1Simultaneous amplitude and angle modulationSite diversityRadio networksWireless sensor network
A method and apparatus is diclosed herein for performing distributed space-time coding. In one embodiment, the distributed space-time coding is used for downlink communications in wireless radio networks. In one embodiment, the method comprises storing information-bearing sequence at two or more base stations in a group of base stations; and transmitting data coprresponding to the information-bearing sequence from a number of base stations for receipt by a reciever of a user, where the number of base stations is not globally known a priori and indicates a diversity of order, such that the diversity of order M is obtained if a total of M number of antennas spread over multiple base stations transmit the information-bearing sequence, where M is an integer.
Owner:NTT DOCOMO INC
Method and System for Cooperative Communications with Minimal Coordination
ActiveUS20090313528A1Verify correctnessHigh data reliabilitySite diversityRandom number generatorsTemporal diversityCommunications system
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.
Owner:TRELLIS WARE TECH
Meathod and apparatus for encryption of over-the-air communications in a wireless communication system
ActiveUS20060062320A1Simultaneous amplitude and angle modulationSimultaneous amplitude and angle demodulationComputer hardwareCommunications system
A communication device converts a bit stream to multiple symbols and provides encryption at a physical layer by shifting a phase of each symbol of the multiple symbols to produce multiple encrypted symbols. Each encrypted symbol of the multiple encrypted symbols is modulated with an orthogonal subcarrier to produce at least one modulated subcarrier and the at least one modulated subcarrier is then transmitted via a wireless link. On a receive side, a receiving communication device receives the transmitted, encrypted symbols and provides decryption at a physical layer by shifting a phase of each encrypted symbol in correspondence with the phase used to encrypt the symbol at the transmit side.
Owner:GOOGLE TECH HLDG LLC
Transpositional modulation systems and methods
ActiveUS9014293B2Simultaneous amplitude and angle modulationSimultaneous amplitude and angle demodulationComputer scienceDemodulation
Systems and methods for transpositional modulation and demodulation are provided. One such method for generating a signal includes the steps of providing a look-up table having a plurality of quarter-cycle waveforms, each of said quarter-cycle waveforms associated with a respective input level; receiving an input signal; and outputting quarter-cycle waveforms associated with levels of the received input signal. Systems for transpositional modulation are also provided. One such system for generating a signal includes a look-up table having a plurality of quarter-cycle waveforms. Each of the quarter-cycle waveforms are associated with a respective input level, and the look-up table is configured to receive an input signal, and output quarter-cycle waveforms associated with levels of the received input signal.
Owner:TM IP HLDG LLC
Predistortion circuit and method for compensating A/D and other distortion in a digital RF communications transmitter
InactiveUS7342976B2Compensation DistortionReduce errorsPower amplifiersCombined modulated pulse demodulationNonlinear distortionData stream
Owner:CRESTCOM INC
Method of and apparatus for recording/reading information, circuit for recording/reading signal
InactiveUS7035029B2Solve problemsDisc-shaped record carriersModulated-carrier systemsByteFrequency offset
An information recording / reading apparatus employs a preamble to reproduce a clock used when recording information in a recording medium and reads the information out of the recording medium at a timing synchronized with a read signal. The preamble is split and recorded by replacing a middle portion of the preamble with data and a sync byte. While a first buffer is employed to delay signal data read out of the recording medium, a frequency offset detector detects a frequency offset using the split preamble.
Owner:TOSHIBA STORAGE DEVICE CORP
CDMA multi-user detection with a real symbol constellation
InactiveUS7035354B2Simple and efficientDoubling numberCombined modulated pulse demodulationFrequency/rate-modulated pulse demodulationMulti user detectionSymbol of a differential operator
A method for multi-user detection includes receiving a complex input signal due to a superposition of waveforms encoding symbols in a real-valued constellation, which are transmitted respectively by a plurality of transmitters in a common frequency band. The complex input signal is sampled at sampling intervals over the duration of an observation period to provide a sequence of complex samples. The sequence of complex samples is processed to determine soft decision values corresponding to the symbols transmitted by the plurality of the transmitters in the observation period, while constraining the soft decision values to be real values. The soft decision values are then projected onto the constellation to estimate the transmitted symbols.
Owner:IBM CORP
Apparatus and method for coding/decoding pseudo orthogonal space-time block code in a mobile communication system using multiple input multiple output scheme
ActiveUS20050281322A1Maximize coding gainMaximize data rateSimultaneous amplitude and angle modulationSimultaneous amplitude and angle demodulationMulti inputBlock code
An apparatus for coding a pseudo orthogonal space-time block code in a transmitter using 4 transmission antennas of first to fourth transmission antennas. Upon receiving information symbol streams x1x2x3x4 to be transmitted, a serial-to-parallel converter parallel-converts the received information symbol streams x1x2x3x4 into x1,x2,x3,x4. A pseudo orthogonal space-time block coding (PO-STBC) encoder codes the parallel-converted information symbol streams x1,x2,x3,x4 using a pseudo orthogonal space-time block coding scheme such that the information symbol streams x1,x2,x3,x4 are transmitted via corresponding transmission antennas for first to fourth time periods.
Owner:SAMSUNG ELECTRONICS CO LTD +1
Apparatus and method for coding/decoding pseudo orthogonal space-time block code in a mobile communication system using multiple input multiple output scheme
ActiveUS7564915B2Maximize coding gain and data rateMinimize decoding calculation and complexitySimultaneous amplitude and angle modulationSimultaneous amplitude and angle demodulationMobile communication systemsComputer science
An apparatus for coding a pseudo orthogonal space-time block code in a transmitter using 4 transmission antennas of first to fourth transmission antennas. Upon receiving information symbol streams x1x2x3x4 to be transmitted, a serial-to-parallel converter parallel-converts the received information symbol streams x1x2x3x4 into x1,x2,x3,x4. A pseudo orthogonal space-time block coding (PO-STBC) encoder codes the parallel-converted information symbol streams x1,x2,x3,x4 using a pseudo orthogonal space-time block coding scheme such that the information symbol streams x1,x2,x3,x4 are transmitted via corresponding transmission antennas for first to fourth time periods.
Owner:SAMSUNG ELECTRONICS CO LTD +1
Method and Apparatus for Channel Estimation and Detection in MIMO System
ActiveUS20110170562A1Improve Channel Estimation AccuracyIncrease overheadSimultaneous amplitude and angle modulationSimultaneous amplitude and angle demodulationCyclic prefixMultiple input
The prevent invention provides a method for performing channel estimation and detection in a Multiple-Input-Multiple-Output (MIMO) system, including: generating a demodulation reference signal, DM-RS, pattern for an extended cyclic prefix (CP); and estimating and detecting channel performance based on the generated DM-RS signal pattern. The DM-RS pattern supports from rank 1 to rank 8 patterns for 8 layer transmission. A transmitter, a receiver and a system thereof are also provided. The solution of the present invention improves channel estimation accuracy, saves channel estimation implementation and implementation complexity at terminals.
Owner:TELEFON AB LM ERICSSON (PUBL)
Tree position adaptive soft output m-algorithm receiver structures
ActiveUS20090213954A1Combined modulated pulse demodulationLine-faulsts/interference reductionChannel state informationCommunications system
A method and apparatus for tree position adaptive SOMA receiver structures are disclosed herein. In one embodiment, a device for use in a wireless communication system comprises a receiver to receive information-bearing signals from the transmitter wirelessly transmitted using OFDM and bit interleaved coded modulation, where the receiver includes an inner decoder structure having a soft output M-algorithm (SOMA) based multiple-in multiple-out (MIMO) joint demapper that uses a SOMA-based MIMO detection process to perform joint inner demapping over each tone, and wherein the SOMA-based MIMO joint demapper is operable to search a detection tree for each tone using a tree-search symbol order that is adapted for each tone based on channel state information and extrinsic information from the outer decoder, where only a number of best alternatives from every level of the tree are expanded.
Owner:NTT DOCOMO INC
Automatic frequency control communication system
InactiveUS6456672B1Simultaneous amplitude and angle modulationSpatial transmit diversityCommunications systemIntegrator
In a communication system using the time diversity transmission scheme, the communication system provided with the stable automatic frequency control circuit with the wide frequency pull-in range and under low CN ratio transmission is achieved by removing the modulation phase from the received data through the application of the data correlation of the time diversity. The frequency offset in the received signal is compensated as the phase rotator rotates the phase of the received signal, the phase converter converts the phase rotator output into a phase, the serial-to-parallel converter converts the phase converter outputs into serial-to-parallel sequence, the delay units gives a delay to the serial-to-parallel converter output, the phase adder adds the serial-to-parallel converter output to the delay unit output, the multiplier multiplies the phase adder output by a certain value, the integrator integrates the multiplier output, another integrator integrates the integrator output, and the phase rotator controls the phase of the received signal based on the other integrator output.
Owner:MITSUBISHI ELECTRIC CORP
Satellite receiver system
ActiveUS20060194562A1Increased styling flexibilityReduce the impactSatellite broadcast receivingPolarisation/directional diversityRepeaterSatellite
An SDARS receiver for use with at least two antennae, each of which receives bitstreams from a first satellite, bitstreams from a second satellite, and bitstreams from a terrestrial repeater, including demodulators configured to switch between demodulating bitstreams from the satellites and to switch between demodulating bitstreams from the terrestrial repeater, and a processor coupled to the demodulators, the processor being configured to switch the demodulators according to a variety of algorithms.
Owner:APTIV TECH LTD
Cooperative code-enhanced multi-user communications system
ActiveUS20030026357A1High data rateComputational complexity is reducedError preventionCombined modulated pulse demodulationDigital dataData stream
A cooperative code-enhanced multiuser communications system having a receiver for resolving user ambiguity in a received composite signal by using convolutional encoder state machine properties to analyze strings of bit sums and separate out individual user data. The receiver comprises a signal sampler which converts a received composite signal to a digital data. A single point cluster mapper determines a closest pseudo-constellation point, and the pseudo-constellation point is formed with the aid of power and timing control in the transmitters. A bit sum look-up table maps symbol points to bit sums. A deterministic loop tests for bit sum cases where symbols can be determined immediately. A guess loop tests the bit sum after the deterministic loop test and performs guesses until all bits are decided. The bit sum is provided to a multiuser convolutional decoder to decide all user data streams.
Owner:COLLISION COMM
Frame-based carrier frequency and phase recovery system and method
ActiveUS20060067432A1Increase capacityQuality improvementSimultaneous amplitude and angle modulationTelevision system detailsFrame basedEngineering
Owner:VIASAT INC
Transpositional modulation systems and methods
ActiveUS20140269969A1Simultaneous amplitude and angle modulationSimultaneous amplitude and angle demodulationComputer scienceDemodulation
Systems and methods for transpositional modulation and demodulation are provided. One such method for generating a signal includes the steps of providing a look-up table having a plurality of quarter-cycle waveforms, each of said quarter-cycle waveforms associated with a respective input level; receiving an input signal; and outputting quarter-cycle waveforms associated with levels of the received input signal. Systems for transpositional modulation are also provided. One such system for generating a signal includes a look-up table having a plurality of quarter-cycle waveforms. Each of the quarter-cycle waveforms are associated with a respective input level, and the look-up table is configured to receive an input signal, and output to quarter-cycle waveforms associated with levels of the received input signal.
Owner:TM IP HLDG LLC
Cyclic delay diversity based transmission with delay hopping
ActiveUS20090275352A1Reduce probabilityIncrease probabilitySimultaneous amplitude and angle modulationModulated-carrier systemsCyclic delay diversityDeterministic method
A method of providing delay information in a multi-antenna transmission system is provided. A time delay value is selected from a set of time delay values. A mobile station is informed of information related to the selected time delay value. The same data is transmitted from a first antenna and from a second antenna. The data is transmitted from the second antenna after the data is transmitted from the first antenna according to the selected time delay value. The time delay value is selected based on a deterministic method or a random method.
Owner:ROSEDALE DYNAMICS LLC
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