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48results about How to "Guaranteed estimated performance" patented technology
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Multi-target positioning method of bistatic multi-input multi-output radar
InactiveCN102135617AAvoid decompositionFast convergenceRadio wave reradiation/reflectionMulti inputComputation complexity
The invention provides a multi-target positioning method of a bistatic multi-input multi-output radar, comprising the following steps of: (1) transmitting mutually orthogonal phase-coded signals by M transmitting array elements, and receiving the phase-coded signals by N receiving array elements, wherein the distances of the M transmitting array elements and the N receiving array elements are all of half wavelengths; (2) carrying out matched filtering on the received phase-coded signals by a matched filter of a receiver of each receiving array element; (3) carrying out multistage Wiener filtering on a matched signal data covariance matrix space, and carrying out forward recursion to obtain a signal subspace; (4) carrying out high-resolution DOA (Direction of Arrival) estimation by using an ESPRIT algorithm, wherein a pairing algorithm is used for carrying out the automatic pairing on two-dimensional parameters; and (5) realizing multi-target positioning according to cross points at two angles so as to obtain the positions of space targets. The multi-target positioning method provided by the invention has the advantages of low computation complexity, high computation speed, high estimation accuracy and can be used for positioning the sea-surface or low-altitude targets during tracking and guidance.
Owner:HARBIN ENG UNIV
Method and apparatus for transmitting a reference signal in a multi-antenna system
ActiveUS20120250656A1Channel estimation performance can be guaranteedGuaranteed performanceModulated-carrier systemsSignal allocationControl channelComputer science
Provided are a method and apparatus for transmitting a reference signal in a multi-antenna system. A terminal generates a plurality of reference signal sequences in which cyclic shift values that are different from each other are allocated to the respective plurality of layers, and generates an orthogonal frequency division multiplexing (SC-FDMA) symbol to which the plurality of reference signal sequences are mapped. The SC-FDMA symbol is transmitted to a base station via a plurality of antennas. Each of the reference signal sequences is multiplied by either +1 or −1 in accordance with an orthogonal covering code (OCC) index corresponding to the cyclic shift field in a DCI format transmitted via a physical downlink control channel (PDCCH) for each layer.
Owner:LG ELECTRONICS INC
Method and device of particle filtering and target tracking
InactiveCN103902812AIncrease diversityImprove accuracySpecial data processing applicationsNormal densityComputer science
The invention discloses a method and device of particle filtering and target tracking. The method of particle filtering comprises the following steps that a probability density function of multiple integral points at the observation time of the last target is built by the adoption of the Gauss-Hermite integral point, an approximate particle set of the integral points is acquired according to the probability density function of the integral points, a predicted particle set is acquired by amending the approximate particle set according to relative features of the target, a predicted probability density function of a target state at the observation time of the current target is acquired according to the predicted particle set, and a posterior probability density function of the target state at the observation time of the current target is acquired according to the predicted probability density function of the target state at the observation time of the current target. According to the method, diversity and accuracy of particles are enhanced, and filtering accuracy and target state estimation performance are improved greatly.
Owner:SHENZHEN UNIV
METHOD AND APPARATUS FOR TRANSMITTING A REFERENCE SIGNAL IN A MULTl-ANTENNA SYSTEM
ActiveUS20150139165A1Guaranteed performanceGuaranteed estimated performanceSignal allocationRadio transmissionCommunications systemControl channel
Owner:LG ELECTRONICS INC
Method for using insertion pilot to inhibit phase noise in orthogonal frequency division multiplexing system
InactiveCN101257470AAccurate estimateGood estimateMulti-frequency code systemsTransmitter/receiver shaping networksPhase noiseLinear correlation
The invention relates to a method using pilot frequency inserting to restrain the phase noise in the orthogonal frequency division multiplexing system, belonging to the transmission of digital information technical field. The method includes carrying the symbol mapping process at the transmitting terminal after the input signals are processed with scrambling code, channel encoding to generate the data symbols; obtaining the frame head; making up of the continuous pilot frequency composed of a pseudorandom sequence and guard gap, inserting the continuous pilot frequency into the data symbols, then processing disperse inverse Fourier transform to get the frame; multiple connecting the frame head and the frame to transmit after back end processing; processing frequency domain equilibrium using the estimated channel response at the receiving end, then carrying linear correlation on the poised signals and the pseudo random sequence to obtain the frequency domain estimated value of the phase noise; carrying disperse inverse Fourier transform on the frequency domain estimated value of the phase noise, than processing the phase correction on the received signals in the time domain to get the compensated signals. The computer simulation shows that the invention can effectively eliminate the phase noise interference with low arithmetic complexity and simple implement.
Owner:TSINGHUA UNIV
Subcarrier clustering and power joint distribution method for radar communication integrated system
ActiveCN111132335AMinimize total radiated powerReduce transmit powerPower managementWave based measurement systemsTransmitted powerRadar
The invention discloses a subcarrier clustering and power joint distribution method for a radar communication integrated system. The method comprises the following steps: determining a target detection and wireless communication model and environment priori knowledge of the radar communication integrated system; respectively constructing a mutual information expression representing target parameter estimation performance and a data transmission rate expression representing communication performance; estimating a performance mutual information threshold [xi]rad and a data transmission rate threshold [xi]com according to preset target parameters, and establishing a subcarrier clustering and power joint distribution model of the radar communication integrated system; solving the subcarrier clustering and power joint distribution model of the radar communication integrated system. The total transmitting power of the radar communication integrated system can be effectively reduced, and theradio frequency stealth performance of the system is effectively improved.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Passive radar time difference and frequency difference coordinated positioning method under errors of motion observation station
ActiveCN109633592AImprove target positioning accuracyReduce complexityWave based measurement systemsPassive radarFDOA
The invention discloses a passive radar time difference and frequency difference coordinated positioning method under errors of a motion observation station. In view of an external illuminator positioning problem under errors of a position and a speed of the motion observation station, according to acquired TDOA and FDOA measurement, a range and a range rate are introduced as intermediate variables to enable a strong nonlinear equation to be subjected to pseudolinearization, and a target position and speed estimation model is built. According to a measurement error variance, and the observation station position and speed errors, an optimal weight is designed, and estimation is carried out by adopting an iterative weighted least square method. A correlation least square estimation model isbuilt by using the correlation between the intermediate variables and the target position and the speed, and the above target position estimation result is improved. By introducing the intermediate variables, a nonlinear measurement model is reasonably transformed to pseudolinearization, the external illuminator positioning complexity is reduced on the premise of ensuring the estimation performance, and influences on target positioning performance by errors of the observation station are reduced.
Owner:HANGZHOU DIANZI UNIV
FPGA (field programmable gate array) based DOA (direction of arrival) estimation fast-implementing method
InactiveCN104793176ASimple thinkingSmall amount of calculationRadio wave direction/deviation determination systemsUnitary transformationDecomposition
The invention discloses an FPGA (field programmable gate array) based DOA (direction of arrival) estimation fast-implementing method. The FPGA based DOA estimation fast-implementing method includes building a central symmetrical array on the basis of virtual array expansion, mapping the algorithm processing from the complex field to the real number field on the basis of preprocessed unitary transformation, calculating covariance matrix on the basis of the FPGA, implementing eigenvalue decomposition on the basis of the FPGA, and performing one-dimensional spatial spectrum search under constraint of threshold on the basis of the FPGA. The FPGA based DOA estimation fast-implementing method with simple conception and low calculation amount has stable performance and high portability, has no limit to antenna type and has wide application range, and helps to implement rapid response function of the DOA on the premise of keeping DOA estimation performance constant; the signal processing is completed within the real number field and only needs add and subtract and shifting of the FPGA.
Owner:周林
OFDM channel estimation method based on depth feature fusion network
ActiveCN109218233AGuaranteed estimated performanceResume transmission signalBaseband system detailsData streamOfdm channel estimation
The invention provides an OFDM channel estimation method based on a depth feature fusion network, which comprises the following steps: S1, inserting a pilot into an original transmission signal; S2, the serial data stream of the transmission signal obtained in the step S1 is changed into a parallel data stream, and the transmission signal is OFDM modulated by the IDFT; 3, chan a transmission signal from a parallel data stream to a serial data stream; Transmitting to a receiving end via an OFDM channel; 4, aft receiving that transmission signal, the receive end changes the transmission signal from the serial data stream to the parallel data stream, and then demodulates the transmission signal by using the DFT; 5, chan a transmission signal from a parallel data stream to a serial data stream, inputting that transmission signal into a channel estimation model of a depth characteristic fusion network, and output the transmission signal fused by the channel estimation model; The invention can effectively recover the transmission signal in the OFDM channel under the condition of limited pilot frequency, CP removal and non-linear noise while ensuring the performance of channel estimation,thereby reducing the influence of data distortion and channel noise.
Owner:STATE GRID CORP OF CHINA +2
Method for using system information to inhibit phase noise in orthogonal frequency division multiplexing system
InactiveCN101257469AFollow up in timeSimple calculationMulti-frequency code systemsPhase noiseCarrier signal
The invention relates to a method using the system information to restrain the phase noise in the orthogonal frequency division multiplexing system, belonging to the transmission of digital information technical field. The method includes carrying the symbol mapping process at the transmitting terminal after the input signals are processed with scrambling code, channel encoding to generate the data symbols; obtaining the frame head; inserting the system information sub carrier into the data symbols to obtain the frame; multiple connecting the frame head and the frame to obtain the signal frame through forming filter, digital analog conversion, radio frequency up conversion, then the signal frame is transmitted to the receiving end; receiving the signal frame at the receiving end to obtain the system information sub carrier in the signal frame and fetch several sub carrier between the system information sub carrier for phase noise estimation, solve the LS equation to get the frequency domain estimation of the phase noise, finally carry the phase correction in the time domain to get the signal frame after being compensated. The signal frame is carried with de-mapping after being compensated, and output after coding process.
Owner:TSINGHUA UNIV
Radar-communication combined system optimum waveform design method based on radio frequency invisibility
ActiveCN109459727AGuaranteed estimated performanceWarranty requirementsWave based measurement systemsHigh level techniquesPrior informationMathematical model
The invention discloses a radar-communication combined system optimum waveform design method based on radio frequency invisibility. The method includes the following steps that S1, prior information of a target relative to a radar-communication combined system is acquired; S2, the mutual information threshold theta MI and the communication rate threshold Cmin of the performance are estimated according to given target parameters, a mathematical model of waveform A[n] optimization design on an n sub-carrier is established, and an expression of a modulus square of an optimum transmitted waveform on the n sub-carrier of the radar-communication combined system is acquired according to the model. By means of the method, the requirements of target parameter estimation performance and communication rates are met, and the radio frequency invisibility performance of the system is improved.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Multi-station multi-external-radiation-source radar moving target positioning method based on error correction
ActiveCN110940976AGuaranteed estimated performanceReduce complexityRadio wave reradiation/reflectionAlgorithmRadar
The invention discloses a multi-station multi-external-radiation-source radar moving target positioning method based on error correction. The method comprises the following steps: firstly, pseudo-linearizing a double-base-distance nonlinear measurement equation and a double-base-distance change rate nonlinear measurement equation of the multi-station multi-external-radiation-source radar to obtainjoint estimation of the position and the speed of a moving target and system deviation; considering the correlation between the auxiliary variable and the target position and speed, constructing a multi-step correlation least square estimation model, and carrying out the optimization solving, so as to reduce the estimation error of the target position and speed; and finally, correcting by using the system deviation estimation value, and performing posteriori iteration to further improve the estimation performance of the target position and speed. The influence of system deviation on the positioning precision is considered, the target state and the system deviation are jointly estimated, and the positioning precision of the moving target is improved through error correction. And meanwhile,multi-step correlation least square estimation and a posteriori iterative algorithm are adopted, so that the estimation error of the target state is further reduced.
Owner:HANGZHOU DIANZI UNIV
Method and apparatus for transmitting a reference signal in a multi-antenna system
ActiveUS8982834B2Guaranteed performanceGuaranteed estimated performanceSpatial transmit diversitySignal allocationControl channelComputer science
Provided are a method and apparatus for transmitting a reference signal in a multi-antenna system. A terminal generates a plurality of reference signal sequences in which cyclic shift values that are different from each other are allocated to the respective plurality of layers, and generates an orthogonal frequency division multiplexing (SC-FDMA) symbol to which the plurality of reference signal sequences are mapped. The SC-FDMA symbol is transmitted to a base station via a plurality of antennas. Each of the reference signal sequences is multiplied by either +1 or −1 in accordance with an orthogonal covering code (OCC) index corresponding to the cyclic shift field in a DCI format transmitted via a physical downlink control channel (PDCCH) for each layer.
Owner:LG ELECTRONICS INC
Demodulation reference signal sending method, demodulation reference signal receiving method, base station and user equipment
ActiveCN109818722AGuaranteed real-timeGuaranteed estimated performanceBaseband system detailsTransmission path multiple useUser equipmentDemodulation
The embodiment of the invention discloses a demodulation reference signal sending and receiving method, a base station and user equipment. The sending method comprises the following steps: determiningthe configuration type of a demodulation reference signal DMRS corresponding to a micro time slot according to the number of symbols occupied by the micro time slot; wherein the configuration parameters corresponding to the configuration types comprise at least one of comb teeth, cyclic shift of the DMRS and symbols occupied by the DMRS, and the number of at least one configuration parameter in different configuration types is different; determining at least one user equipment scheduled in the micro time slot and the value of the configuration parameter corresponding to the at least one userequipment according to the configuration type; And sending the configuration type and the value of the configuration parameter to the at least one user equipment. In the embodiment of the invention, the configuration type of the corresponding DMRS is determined according to the number of symbols occupied by the micro time slot, so that the real-time performance of performing channel estimation through the DMRS is ensured, and the channel estimation performance is ensured.
Owner:SHENZHEN TRANSSION HLDG CO LTD
Distributed particle filter method based on information consistency
InactiveCN104485921AImprove estimation accuracyImprove robustnessAdaptive networkInformation consistencyDistributed computing
The invention provides a sensor network distributed particle filter method based on information consistency in a nonlinear and non-Gaussian system. According to the method, based on centralized particle filter, network reliability is introduced to represent a global likelihood function, the interaction and the fusion of local reliability are performed through consistency iteration, the consistency of particle samples and weight value among nodes is realized, the precision is estimated to approach an centralized method. The distributed particle filter method based on information consistency is used for realizing consistency state estimation throughout of the network through a distributed mode, and has relatively excellent estimation performances in nonlinear and non-Gaussian environments of flicker noises and the like.
Owner:NAVAL AERONAUTICAL & ASTRONAUTICAL UNIV PLA
Self-adaptive forward output consistent safety controller for multi-single-arm manipulator
PendingCN114179115AFast approximation performanceAvoid complexityManipulatorTotal factory controlController designSelf adaptive
The invention relates to a self-adaptive forward output consistent safety controller for a multi-single-arm manipulator, which is characterized in that self-adaptive Iamp is adopted for N follower single-arm manipulators with unknown dynamics based on a leader single-arm manipulator with an expected trajectory; according to the technology I, an uncertain equivalent estimator is designed, a failure fault caused by an actuator fault is processed, and the negative influence of the failure fault is overcome; meanwhile, a distributed output consistent controller is designed for each follower single-arm manipulator by utilizing a self-adaptive forward technology, so that the design difficulty of the controllers is reduced, and a self-adaptive Iamp is introduced; the technology I improves the radial basis function neural network, and improves the approximation performance of the neural network to unknown dynamics. Besides, a dynamic trigger mechanism is adopted to design a leader information estimator, continuous monitoring of neighbor information is avoided, the communication frequency between the single-arm manipulators is reduced, unknown dynamic states in the system can be effectively processed through the whole design, faults of an actuator can be resisted, and the reliability of the system is improved. And the design difficulty of the controller is reduced, and the communication frequency and precision control among the single-arm manipulators are reduced.
Owner:NANJING UNIV OF POSTS & TELECOMM
MIMO spatial non-stationary channel estimation method based on image contour extraction
ActiveCN113141202AAchieve estimatesRealize TrackingRadio transmissionChannel estimationPattern recognitionImage contour
A spatial non-stationary channel estimation method based on image contour extraction is characterized in that in a large-scale MIMO spatial non-stationary channel moving scene, sparse received signals in an angle time delay domain are represented in an image form, and then the number of estimated paths, the angle of each path and the time delay are obtained by using an estimation algorithm of image contour extraction; after a sparse receiving signal in a space time delay domain is represented in an image form, effective visual region estimation corresponding to each channel path is obtained by utilizing an estimation algorithm of image contour extraction, so that path gain and channel reconstruction are realized; according to the method, an image contour extraction technology and the sparsity of the channel in an angle time delay domain and a space time delay domain are utilized to estimate the angle and time delay of each path of the channel and a visual region which does not depend on sub-array division, and a traditional iterative optimization method is replaced to solve the problem of spatial non-stationary channel estimation.
Owner:SHANGHAI UNIV
Continuous wave interference detection and identification method based on phase-amplitude locking loop
ActiveCN110554413ASmall amount of calculationGuaranteed estimated performanceSatellite radio beaconingContinuous wave interferenceTime domain
The invention discloses a continuous wave interference detection and identification method based on a phase-amplitude locking loop. According to the method, a time domain front-end interference detection and identification technology is adopted to carry out detection and feature identification on common continuous wave interference. The method comprises the following steps: firstly, improving a traditional phase locked loop (PLL), and improving the tolerance of the PLL to dynamic stress by adopting a differential-auxiliary (DA) PLL; secondly, estimating the frequency of continuous wave interference through PLL assisted by a differentiator; on the basis of estimation parameters of PLL assisted by a differentiator, the amplitude of continuous wave interference is estimated through an amplitude locked loop (ALL), detection and identification of the continuous wave interference are achieved according to the estimated frequency and amplitude, and a basis is provided for research of a continuous wave interference suppression method.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Embedded attitude estimation method based on unmanned aerial vehicle reconnaissance image
PendingCN112966546AImprove operational efficiencyReal-time processingCharacter and pattern recognitionNeural architecturesData setImaging processing
The invention discloses an embedded attitude estimation method based on an unmanned aerial vehicle reconnaissance image, and belongs to the field of image processing and machine vision. The method specifically comprises the following steps: acquiring an original unmanned aerial vehicle reconnaissance image data set, and performing data enhancement processing on the original unmanned aerial vehicle reconnaissance image data set; performing labeling processing on the obtained original unmanned aerial vehicle reconnaissance image data set to obtain a training data set with labels; constructing a lightweight multi-stage hourglass network, and training the lightweight multi-stage hourglass network by using the training data set; and inputting a to-be-processed unmanned aerial vehicle reconnaissance image, preprocessing the unmanned aerial vehicle reconnaissance image, inputting the preprocessed unmanned aerial vehicle reconnaissance image into the trained lightweight attitude estimation network to obtain a portrait feature map, and estimating a portrait attitude according to the portrait feature map. According to the technical scheme of the invention, algorithm performance and deployment adaptability are planned as a whole, and many problems of attitude estimation of the unmanned aerial vehicle video processing system are solved.
Owner:AEROSPACE TIMES FEIHONG TECH CO LTD +1
A processing method, base station, and user equipment for a sounding reference signal
ActiveCN109644445BEasy to detectGuaranteed estimated performanceWireless communicationSounding reference signalGuard interval
A method for processing a sounding reference signal, a base station and a user equipment. The method for processing a sounding reference signal comprises: configuring indication information used for indicating N symbols in a uplink pilot time slot (UpPTS) in a special subframe, wherein the N symbols are used for carrying an SRS repeatedly sent by a first user equipment (UE), the special subframe comprises: a downlink pilot time slot (DwPTS), a guard period (GP) and the UpPTS, and N is a natural number greater than 2; sending the indication information, the configuration thereof being complete, to the first UE; and receiving, on the N symbols in the UpPTS in the special subframe, the SRS sent by the first UE.
Owner:HUAWEI TECH CO LTD
Linear frequency modulation continuous wave radar pre-detection parameter estimation method based on FFT
PendingCN113759316AReduced solution complexityEffective Target Range and Doppler Shift EstimationWave based measurement systemsComplex mathematical operationsContinuous-wave radarEngineering
The invention provides a linear frequency modulation continuous wave radar pre-detection parameter estimation method based on FFT. The method comprises the following steps: carrying out grid point division of a fast time domain and a slow time domain, building an observation model of a received signal, and carrying out distance and Doppler parameter estimation of all grid points based on the model; removing coupling among the grid points based on a weighting matrix, and converting a joint estimation problem of target parameters corresponding to all the grid points into individual estimation of each grid point target; establishing a cost function of a parameter estimation problem, and obtaining an analytic solution of parameter estimation based on first-order Taylor approximation; calculating a first-order derivative and a second-order derivative in a parameter estimation analytic solution based on FFT, and obtaining a parameter estimation result on the basis of the first-order derivative and the second-order derivative. According to the method, target parameters can be quickly estimated before target detection, so that accurate matching signal processing based on known parameters becomes possible.
Owner:江苏云禾峰智能科技有限公司
Particle filtering method and device, and target tracking method and device
InactiveCN103902812BIncrease diversityImprove accuracySpecial data processing applicationsNormal densityComputer science
The invention discloses a method and device of particle filtering and target tracking. The method of particle filtering comprises the following steps that a probability density function of multiple integral points at the observation time of the last target is built by the adoption of the Gauss-Hermite integral point, an approximate particle set of the integral points is acquired according to the probability density function of the integral points, a predicted particle set is acquired by amending the approximate particle set according to relative features of the target, a predicted probability density function of a target state at the observation time of the current target is acquired according to the predicted particle set, and a posterior probability density function of the target state at the observation time of the current target is acquired according to the predicted probability density function of the target state at the observation time of the current target. According to the method, diversity and accuracy of particles are enhanced, and filtering accuracy and target state estimation performance are improved greatly.
Owner:SHENZHEN UNIV
Information configuration method and device, channel estimation method and device and decoding device
ActiveCN109831284AIncrease overheadImprove estimation performanceError preventionTransmitter/receiver shaping networksTime domainEstimation methods
The invention provides information configuration, channel estimation method and device, the information configuration method comprises the steps that a demodulation reference signal pilot frequency isconfigured in a time-frequency resource, the signal is used for transmitting a signal or used for a receiving end to conduct channel estimation or detection demodulation, the demodulation reference signal pilot frequency accounts for n symbols in m symbols in a time domain, m is an integer larger than 1, and n is equal to 0. By adopting the technical scheme, the problems that in the related art,the pilot frequency overhead is increased, and although the channel estimation performance can be improved, the system spectral efficiency is low due to the fact that the pilot frequency overhead is increased are solved.
Owner:ZTE CORP
Method, system, device and storage medium for estimating transmitted signals
ActiveCN113541749BSolving problems with high estimation complexityReduce complexityQuantum computersSpatial transmit diversityFir systemEstimation methods
The present invention provides a transmission signal estimation method, system, equipment and storage medium, which are used in a MIMO system. The estimation method includes: receiving external received signals; establishing a quantum population; extracting the optimal probability from the initial probability range of the quantum chromosome Update the initial probability amplitude: get the mutation probability amplitude, mixing probability amplitude and rotation probability amplitude according to the initial probability amplitude; update the initial probability amplitude according to the mixing probability amplitude and rotation probability amplitude, and extract the latest optimal probability amplitude, and increase the number of iterations by one ; Determine whether the number of iterations reaches the iteration threshold: if yes, obtain the estimated signal of the transmitted signal according to the latest optimal probability amplitude; if not, continue to update the initial probability amplitude. The invention adopts the maximum likelihood detection function algorithm to update the probability range of the quantum chromosome so that it approaches the transmission signal and converges; it solves the problem of high signal estimation complexity, reduces the number of searches and reduces the Signal estimation complexity.
Owner:ANHUI UNIVERSITY
synchronous reference signal sending and frequency offset estimation of UFMC waveforms
ActiveCN109802910AGuaranteed estimated performanceReduce computational complexityMulti-frequency code systemsComputation complexityCommunications system
The invention provides a synchronous reference signal sending and frequency offset estimation method suitable for UFMC waveforms. A synchronous reference signal with a cyclic structure is designed tobe sent, integer frequency offset can be estimated at a receiving end through a simple correlation method, the calculation complexity is greatly reduced, and meanwhile it is guaranteed that the estimation performance is not changed. The method is suitable for the UFMC waveform technology which can be adopted in the next generation of communication system, and is also suitable for other multi-carrier systems, such as a filter bank multi-carrier (FBMC), generalized frequency division multiplexing (GDMC) and the like. The frequency offset estimation method provided by the invention can also be applied to the new waveform technologies with filters. In addition, the method is also suitable for traditional waveforms, such as OFDM and the like.
Owner:SOUTHEAST UNIV
Angle-Delay Domain Pilot Multiplexing Wideband Massive MIMO Communication Method
ActiveCN104219189BReduce overheadImprove spectral efficiencyBaseband system detailsMulti-frequency code systemsData segmentFrequency spectrum
The invention provides an angle-time delay domain pilot frequency multiplexing broadband mass MIMO (multiple input multiple output) communication method. The method includes that a base station wirelessly communicates with multiple subscribers on each subcarrier; a probe sequence of each subscriber is generated via a same constant modulus sequence by means of frequency domain modulation, the different subscribers send uplink probe signals on multiple subcarriers of one or more continuous OFDM (orthogonal frequency division multiplexing) symbols simultaneously, and the base station acquires angle-time delay domain two-dimensional statistics channel information according to the uplink probe signals and determines pilot frequency modulation factors of all the subscribers according to the angle-time delay domain two-dimensional statistics channel information; a pilot frequency sequence of each subscriber is generated via the same constant modulus sequence by means of frequency domain modulation, the different subscribers send uplink pilot frequency signals on the multiple subcarriers of the one or more continuous OFDM symbols simultaneously, and the base station acquires channel estimation values of a pilot frequency band and a data segment of each subscriber according to the uplink pilot frequency signals; on each subcarrier, the base station implements uplink and downlink robust transmission according to the channel estimation values and estimation error space correlation matrixes. By the method, system pilot frequency overhead can be lowered, and system frequency spectrum and power efficiency is improved.
Owner:SOUTHEAST UNIV
Coprime coherent signal source estimation method based on denoising nuclear norm minimization
PendingCN114019446AGuaranteed estimated performanceAchieving Super-Resolution DOA EstimationRadio wave finder detailsRadio wave direction/deviation determination systemsAlgorithmZ eigenvalue
The invention discloses a coprime coherent signal source estimation method based on denoising nuclear norm minimization, which comprises the following steps: a plurality of far-field coherent signal sources emitting the same electromagnetic wave signal to a co-prime array according to different DOA to obtain a receiving signal of the co-prime array; acquiring a receiving signal of the interpolated uniform linear array; calculating a sampling covariance matrix of the interpolation uniform linear array, and constructing a binary identification matrix; reconstructing a Toeplitz matrix with a complete element; performing eigenvalue decomposition on the Toeplitz matrix, and obtaining an estimated coherent signal source angle parameter through spectral peak search; and finally, obtaining an estimated DOA parameter of the coherent signal source. According to the method, on the basis of a co-prime array interpolation algorithm based on nuclear norm minimization, denoising operation is introduced, the nuclear norm minimization problem of a Toeplitz matrix formed by received signals is solved through convex optimization, and high-precision super-resolution DOA estimation of multiple coherent signal sources is achieved.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
An Eigenvector Phase Compensation Method Based on Arnoldi
ActiveCN108445465BEigen decomposition avoidanceGuaranteed estimated performanceWave based measurement systemsFeature vectorMaximum eigenvalue
An Arnoldi-based eigenvector phase compensation method, the invention relates to an Arnoldi-based eigenvector phase compensation method. The purpose of the present invention is to solve the problem of large amount of calculation in the existing eigenvector-based phase compensation method. 1. Take M target echoes, take the modulus of the complex range image to obtain the one-dimensional range image of the target echo, and use the cumulative cross-correlation method to perform envelope alignment to obtain the range-dimension compressed data after envelope alignment; 2. Calculate Obtain the sampling covariance matrix; 3. Use Arnoldi to iteratively solve the eigenvector corresponding to the maximum eigenvalue of the sampling covariance matrix, extract the phase information of each element in the eigenvector corresponding to the maximum eigenvalue, and align the distance of the envelope in one Phase compensation is performed on the three-dimensional compressed data to obtain the phase-compensated data; Fourth, the range-Doppler method is used to perform ISAR imaging on the phase-compensated data. The invention is used in the field of inverse synthetic aperture radar.
Owner:HARBIN INST OF TECH
Characteristic vector phase compensation method based on Arnoldi
ActiveCN108445465ASmall amount of calculationGuaranteed estimated performanceWave based measurement systemsArnoldi iterationPhase compensation
The invention relates to a characteristic vector phase compensation method based on Arnoldi. By using an existing phase compensation method based on a characteristic vector, a calculated amount is large. By using the method of the invention, the above problem is solved. The method is characterized by 1, taking M target echoes, acquiring the one-dimensional distance image of the target echoes by modeling a complex distance image, using an accumulation cross correlation method to carry out envelope alignment and acquiring distance dimension compression data after envelope alignment; 2, calculating a sampling covariance matrix; 3, using Arnoldi iteration to solve a characteristic vector corresponding to the maximum characteristic value of the sampling covariance matrix, extracting phase information of each element in the characteristic vector corresponding to the maximum characteristic value, carrying out phase compensation on the distance dimension compression data after the envelope alignment in the step1, and acquiring the data after phase compensation; and 4, using a range Doppler method to carry out ISAR imaging on the data after the phase compensation. The method is used for theinverse synthetic aperture radar field.
Owner:HARBIN INST OF TECH
Massive mimo wireless communication method based on pilot multiplexing
ActiveCN103546264BReduce overheadReduce pilot overheadTransmission path divisionChannel estimationMultiplexingCommunications system
Owner:SOUTHEAST UNIV
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