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76 results about "Zero-forcing precoding" patented technology
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Zero-forcing (or null-steering) precoding is a method of spatial signal processing by which the multiple antenna transmitter can null multiuser interference signals in wireless communications. Regularized zero-forcing precoding is enhanced processing to consider the impact on a background noise and unknown user interference, where the background noise and the unknown user interference can be emphasized in the result of (known) interference signal nulling.
Pre-encoded transmission method for MIMO system
InactiveCN101453259AReduce mistakesImprove spectrum utilizationSpatial transmit diversityMulti inputFrequency spectrum
The invention provides a precoding transmission method for a multi-input and multi-output system, which comprises: a mobile station supposes an emission matrix as a unitary matrix, an MMSE receiver is used for signal combination, an equative channel is calculated, CQI and CDI are obtained and are fed back a base station; according to a channel direction index and channel quality information fed by the mobile station, the base station obtains a zero-forcing precoding emission matrix or a regulated zero-forcing precoding emission matrix corresponding to partial or total possible user combination, carries out multiuser scheduling operation and determines the scheduled user combination; and the base station utilizes the zero-forcing precoding emission matrix or the regulated zero-forcing precoding emission matrix corresponding to the scheduled user combination to carry out precoding and emission; and a scheduled user carries out MMSE receiving. The method reduces error of channel feedback, therefore effectively promoting the utilization ratio of frequency spectrum of the system.
Owner:NTT DOCOMO INC
Method for designing multi-user signal and energy simultaneous transmission system low complexity transceivers
ActiveCN104320219AReduce transmit powerReduce complexityError preventionRadio transmissionSingular value decompositionTransceiver
The invention discloses a method for designing multi-user signal and energy simultaneous transmission system low complexity transceivers. The method comprises the following steps that a base station conducts channel estimation to obtain channel vectors between the base station and all users; an interference channel matrix of each user is defined, each interference channel matrix is composed of all channel vectors excerpt the channel vector of the corresponding user, singular value decomposition is conducted on each interference channel matrix to obtain a zero space orthogonal basis matrix, a zero-forcing precode and a maximum joint transmit precode of each user are calculated, and each transmit precode is fixed as the weighted combination of the corresponding zero-forcing precode and the corresponding maximum joint transmit precode; the joint design problem of transmit end precode weights based on transmit power minimizatio, and receiving end power splitting factors is solved through the positive semi-definite relaxation technology to obtain precode weight vectors and the receiving end power splitting factors; finally, the base station conducts precoding on emission signals and sends the power splitting factors to the corresponding users through control channels at the same time. The method reduces the transmit power and also lowers the calculation complexity.
Owner:ZHEJIANG SCI-TECH UNIV
Physical layer secure transmission method using spatial modulation technology
InactiveCN106850012AImprove securityAchieve securitySpatial transmit diversityCommunication jammingChannel state informationSignal-to-noise ratio (imaging)
The invention discloses a physical layer secure transmission method using the spatial modulation technology. It is assumed that a sender can obtain channel state information of a legal user and an illegal user, the sender obtains an index number and a to-be-sent symbol of a receiving antenna according to to-be-transmitted bit data by using the pre-encoding assisted generalized orthogonal spatial modulation technology, obtains a zero-forcing pre-encoding matrix by using the channel state information between the sender and the legal user, adds artificial noise to a zero space of a channel between the sender and the legal user, and finally figures out the optimal power allocation through the maximum secrecy capacity; and the legal user can smoothly decode the information sent by the sender through the channel state information between the sender and the legal user, and the eavesdropping user is interfered by the artificial noise and cannot correct decoding the information, thereby realizing the security of a physical layer. By adoption of the physical layer secure transmission method disclosed by the invention, higher security capacity can be stably obtained under the same signal-to-noise ratio.
Owner:XI AN JIAOTONG UNIV
Communication system transmission method based on intelligent reflection surface assistance
ActiveCN113746578AMaximize Spectral EfficiencyOptimizing Phase ShiftTransmission monitoringNetwork planningChannel state informationCommunications system
The invention discloses a communication system transmission method based on intelligent reflection surface assistance, which comprises the following steps: aiming at an intelligent reflection surface assistance single-user communication system based on instantaneous channel state information, transmitting a beam forming vector by adopting a maximum ratio transmission design, and optimizing intelligent reflection surface phase shift by utilizing a manifold alternating optimization method; for a single-user communication system assisted by an intelligent reflection surface based on statistical channel state information, carrying out joint optimization on a transmitted beam forming vector and intelligent reflection surface phase shift by utilizing an alternating iterative optimization method; for an intelligent reflection surface assisted multi-user communication system based on instantaneous channel state information, adopting a zero-forcing precoding design to transmit a beam forming vector, and utilizing a positive semidefinite relaxation method to optimize intelligent reflection surface phase shift. According to the method, a manifold alternating optimization method, an alternating iterative optimization method and a positive semidefinite relaxation method are adopted, so that the joint optimization problem of the base station transmitted beam forming vector and the IRS phase shift is solved.
Owner:NANJING UNIV OF POSTS & TELECOMM
Millimeter wave communication system hybrid precoding method based on zero forcing
ActiveCN107332596AReduce the numberSave power overheadRadio transmissionQR decompositionMillimeter wave communication systems
The invention discloses a millimeter wave communication system hybrid precoding method based on zero forcing. The method comprises the steps of establishing a zero forcing precoding matrix according to a channel matrix; decomposing the zero forcing precoding matrix into a product of a unitary matrix and an upper triangular matrix through QR decomposition; matching the unitary matrix in the step 2 through utilization of an array manifold vector and establishing an analog end precoding matrix, wherein elements in the matrix have constant modulus characteristics; obtaining a digital end precoding matrix through utilization of the analog end precoding matrix and the zero forcing precoding matrix, wherein a final hybrid precoding matrix represents the product of the analog end precoding matrix and the zero forcing precoding matrix. In a millimeter wave downlink system of which the number of transmitting antennas is greater than that of receiving antennas, the number of radio frequency links required by the method is the same to that of the receiving antennas. Compared with the traditional ZF precoding of which number of radio frequency links is the same to that of the transmitting antennas, the method has the advantage that the number of the radio frequency links is fewer, so the hardware cost and extra hardware device power cost of the system are reduced.
Owner:NANJING UNIV OF POSTS & TELECOMM
Multi-user generalized space modulation system linearity zero-forcing precoding method
ActiveCN105827293AAccurate detectionEliminate distractionsSpatial transmit diversityZero-forcing precodingLinearity
The invention discloses a multi-user generalized space modulation system linearity zero-forcing precoding method. The method comprises the following steps: establishing a multi-user generalized space modulation system, and grouping antennas at a link sending end, wherein each group of sending antennas serve one receiving end by use of generalized space modulation; performing dimension reduction on a channel gain matrix of a sending signal matrix in a system so as to obtain an equivalent channel gain matrix and an equivalent sending signal matrix; and by use of a dimension reduction matrix, performing zero-forcing precoding processing on the sending signal matrix at the sending end, and transmitting signals by use of the equivalent channel gain matrix so as to eliminate interference between users and interference between channels at the same time. The method provided by the invention can effectively improve error code performance of the system and the capacity of the system.
Owner:河南兰舟信息技术有限公司
Self-adaptive bit distributing method and self-adaptive bit distributing device in cooperative multi-aerial system
The invention provides a self-adaptive bit distributing method and a self-adaptive bit distributing device in a cooperative multi-aerial system. The self-adaptive bit distributing method includes: extracting the receiving power of a data signal and an interference signal and time delay information of every channel according to channel estimation; according to the signal receiving power and the time delay information of every channel, respectively calculating an optimal feedback bit number distributed to data channels and every interfering channel on the premise of fixing a total feedback bit number, minimizing rate loss caused by non-ideal state of channel information; determining the size of a codebook according to the optimal feedback bit number, selecting and transmitting corresponding code-quantified channel state information from the codebook according to a minimum chordal distance criterion by the aid of ideal channel information, and receiving the code-quantified channel state information and generating a zero-forcing pre-coding matrix according to the same. The zero-forcing pre-coding operation is performed by the aid of the obtained non-ideal channel information via a base station, and interferences among multiple users in a local cell and among neighbor cells are restrained.
Owner:BEIJING UNIV OF POSTS & TELECOMM
Joint distribution method of limited feedback number of bits in multi-point cooperation system
ActiveCN102811491AImprove throughputBaseband system detailsWireless communicationDistribution methodData rate
Owner:SHANGHAI JIAO TONG UNIV
Pilot pollution-eliminated double-layer pre-coding design method in massive MIMO system
ActiveCN105978612ASuppress interferenceSolve the problem of pilot pollutionSpatial transmit diversityBaseband system detailsZero-forcing precodingMinimum mean square error
The invention discloses a pilot pollution-eliminated double-layer pre-coding design method in a massive MIMO (Multiple Input Multiple Output) system, and belongs to the technical field of wireless communication. The specific design process is as follows: when the system works in a TDD (Time Division Duplex) mode, sending a pilot sequence to a base station by a user for estimation of an uplink channel, and obtaining downlink channel estimation based on channel reciprocity by the base station; then designing an outer-layer pre-coding matrix based on a zero-forcing pre-coding idea at the base station end so as to suppress inter-user interference in a cell; and finally regarding a channel and the outer-layer pre-coding matrix as an integer to serve as an equivalent channel, and further designing an inner-layer pre-coding matrix based on a minimum mean square error criterion to suppress interference caused by pilot pollution in the system. According to the pilot pollution-eliminated double-layer pre-coding design method in the massive MIMO system, the pre-coding matrix is designed in combination with the pilot pollution elimination, and the problem of inherent pilot pollution existing in the massive MIMO system is solved.
Owner:CHONGQING UNIV OF POSTS & TELECOMM
Precoding technique in massive MIMO network based on time inversion
InactiveCN109120320AReduce distractionsImprove signal-to-interference ratioRadio transmissionTransmitter/receiver shaping networksZero-forcing precodingEngineering
The invention relates to a precoding technique in a massive MIMO network based on time inversion, specifically relates to the fusion and improvement of the time inversion technique and the precoding technique in the massive MIMO network, and achieves the purpose of interference inhibition. The channel optimization of the technique is performed on the basis of the time inversion technique, and thetechnique achieves the energy gathering through the spatiotemporal focusing of the time inversion technique. The improvement is achieved on the basis of the zero-forcing precoding technique, and the technique reduces the inter-user interference and co-channel interference in the massive MIMO network through the zero-forcing precoding technique in a multi-path environment, thereby achieving the interference inhibition. A receiving end antenna can obtain the channel state information of a multi-path channel at a base station antenna end through the channel detection, and the up-sampling is performed on the base station antenna so as to reduce the signal transmission rate. The inter-user interference and co-channel interference are reduced under the condition of the multi-path channel throughthe zero-forcing precoding technique, so the technique provided by the invention can enable the mean bit error rate to be reduced, and remarkably improves the SINR (Signal to Interference plus NoiseRatio) and the achievable rate of the massive MIMO system.
Owner:CHONGQING UNIV OF POSTS & TELECOMM
Large-scale MIMO (Multiple Input Multiple Output) optimal user scheduling number configuration method
ActiveCN107359917ALow costReduce computational complexityRadio transmissionWireless communicationSignal-to-noise ratio (imaging)Zero-forcing precoding
The invention discloses a large-scale MIMO (Multiple Input Multiple Output) optimal user scheduling number configuration method. In a large-scale MIMO system, a base station needs to be configured with tens of, even hundreds of antennas. Specific to the aim of lowering hardware cost and system power consumption, the antennas of the base station are configured with 1-bit-quantified DACs (Digital-to-Analog Converters), and single antenna users adopt finite-bit-quantified ADCs (Analog-to-Digital Converters). Oriented to downlink data transmission in a system, normalized zero-forcing precoding is adopted. Under the condition that the number of the base station antennas, user ADC accuracy, a signal-to-noise ratio, a pilot frequency length and a coherence interval are given, an optimal user scheduling number is calculated through maximization of an achievable rate provided by each antenna. Through adoption of the method, calculation is easy, and the optimal user number can be determined rapidly. The method has guiding significance to multi-user scheduling parameter configuration of the large-scale MIMO system.
Owner:SOUTHEAST UNIV
MU-MISO visible light communication system zero-forcing pre-coding matrix determining method
ActiveCN105429709AImprove performanceSignificant Bandwidth Utilization GainClose-range type systemsElectromagnetic transmittersCommunications systemOptical power
The present invention discloses a MU-MISO visible light communication system zero-forcing pre-coding matrix determining method. An error code parameter is determined according to the error code rate needed by an MU-MISO visible light communication system, then according to the error code parameter, the equivalent channel gain of the kth user of the MU-MISO visible light communication system, the standard difference of kth user receiver noise, a channel matrix, the maximum transmitting optical power of an LED, and a corresponding constraint condition, the optimization solution of a target function is carried out, an optimal zero-forcing pre-coding matrix W is obtained, and compared with a traditional zero-forcing pre-coding scheme based on channel pseudo inverse, a significant bandwidth utilization rate gain can be obtained in the scene that each emitting LED light power is limited.
Owner:SOUTHEAST UNIV
Millimeter wave wireless energy-carrying safety communication method and device
ActiveCN112073100AMaximize confidentialityRadio transmissionHigh level techniquesSecure communicationMultiuser system
The invention relates to a millimeter wave wireless energy-carrying safety communication method and device for maximizing the secrecy rate of a system. The method comprises the following steps: S1, adopting a B-bit quantization phase shifter to realize analog precoding in a full connection and sub-connection structure; S2, constructing a joint optimization problem of a digital precoding vector, apower splitting rate and an artificial noise covariance matrix; S3, proposing an alternating optimization algorithm based on semi-definite relaxation to solve a suboptimal solution; and S4, proposingan alternating optimization algorithm based on zero-forcing precoding to reduce the complexity. The invention provides the secrecy rate maximization method and device based on millimeter waves SWIPT by combining the millimeter waves and the SWIPT. Millimeter waves can be used for filling more antennas with smaller physical sizes; in a multi-user system, the SWIPT interference power is converted into the energy of a receiving end, so that the energy efficiency can be improved; and analog / digital hybrid precoding is adopted, and the number of needed RF chains is far smaller than the number of antennas.
Owner:ZHENGZHOU UNIV
Message encryption method by means of wireless physical layer information
ActiveCN106604270AEffective use does not lack certaintyIncrease uncertaintyForward error control useSecurity arrangementComputer hardwareCurrent channel
The invention provides a message authentication method by means of wireless physical layer information. In the communication process of a base station with a user, the base station sends the pilot frequency to the user, after determining the uncertainty of the channel between the base station and the user according to the pilot information, the user makes the transmitted corresponding bit message be the zero-forcing pre-code, the user side and the base station store the message as a secret key set after receiving the signal, and after the user side finds that the channel information is changed, the user takes the transmission length as the information length in the secret key set and the uncertainty of the current channel change as the message in the next secret key set and transmits the message to the base station, so that the effects of message encryption and secret key storage can be achieved.
Owner:TSINGHUA UNIV
Unmatched channel power distribution method based on zero-forcing precoding and system thereof
ActiveCN106603133AImprove rationalityCommunication System Resource ConservationPower managementRadio transmissionChannel powerDistribution method
An embodiment of the invention provides a unmatched channel power distribution method based on zero-forcing precoding and a system thereof. The method comprises the following steps of acquiring and according to a terminal of an multiple-input-multiple-output system of zero-forcing precoding and an amplitude and a phase of a radio frequency circuit gain of a base station, establishing an uplink channel model and a downlink channel model; according to the uplink channel model and the downlink channel model, determining an approximate sum rate; and according to the approximate sum rate, establishing an optimization function taking a maximized approximate sum rate as an object. When receiving and transmission circuits of a base station side match with each other, and receiving and transmission circuits of a terminal side do not match with each other, according to the optimization function, through a water filling theorem, an optimal solution of base station power distribution is determined. Or when the receiving and transmission circuits of the terminal side match with each other, and the receiving and transmission circuits of the base station side do not match with each other, according to the optimization function, through a formula which is used to convert the function from nonconvexity into convexity, the optimal solution which makes the approximate sum rate be a maximum is determined. According to the optimal solution, downlink power of the multiple-input-multiple-output system is configured.
Owner:BEIJING UNIV OF POSTS & TELECOMM
Hybrid precoding energy efficiency optimization method of millimeter wave MIMO-OFDM communication system
ActiveCN110212959AImprove energy efficiencySolving Joint Design ProblemsRadio transmissionMulti-frequency code systemsData streamCommunications system
The invention discloses a hybrid precoding energy efficiency optimization method of a millimeter wave MIMO-OFDM communication system. The hybrid precoding energy efficiency optimization method comprises the following steps: acquiring the maximum transmitting power of a millimeter wave MIMO-OFDM communication system base station and a channel matrix corresponding to each subcarrier; on the basis ofthe maximum transmitting power and each channel matrix, solving to obtain a power distribution value corresponding to each data stream under each subcarrier by taking the optimal energy efficiency ofthe base station as a target to form a subcarrier power distribution scheme; and obtaining a digital precoding matrix of each subcarrier and an analog precoding matrix suitable for all subcarriers based on the subcarrier power distribution scheme and the optimal energy efficiency target. According to the method, under the condition that the transmitting power of the base station is limited, a power distribution scheme and a hybrid precoding scheme which enable the energy efficiency to be optimal are provided. The combined design problem of hybrid precoding under broadband millimeter waves issolved, the energy efficiency is improved to the maximum extent, and compared with an existing all-digital zero-forcing precoding scheme, the energy efficiency of a millimeter wave MIMO-OFDM communication system is effectively improved while the network capacity performance is considered.
Owner:HUAZHONG UNIV OF SCI & TECH
Hybrid precoding method based on condition number of sub-band equivalent channel matrices
ActiveCN108712198AProper Bit Error Rate PerformanceReduce complexityRadio transmissionZero-forcing precodingEngineering
The invention belongs to the technical field of wireless communications, and in particular to a hybrid precoding method based on condition number of sub-band equivalent channel matrices. The inventionadopts hybrid precoding in the precoding of the base station, determines a suitable precoding scheme according to the condition number magnitude of the sub-band equivalent channels, uses mixed zero-forcing precoding when the sub-band condition number is small, and uses mixing vector perturbation precoding when the sub-band condition number is large, thereby improving the overall bit error rate performance of the system with lower complexity.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Phase noise suppression method for large-scale MIMO orthogonal frequency division multiplexing system
ActiveCN110166401APhase Noise SuppressionRadio transmissionMulti-frequency code systemsInformation transmissionPhase noise
The invention belongs to the technical field of wireless communication, and relates to a phase noise suppression method for a large-scale MIMO orthogonal frequency division multiplexing system. According to the invention, multi-user communication is realized based on zero-forcing precoding; firstly, a training OFDM symbol is used for roughly estimating a composite channel, combining a physical channel and a zero-forcing precoding weight influence, of each user; then, an iterative algorithm is provided for information transmission OFDM symbols to jointly estimate data sequences and phase noiseand refine estimation of a composite channel, so that adverse effects of the phase noise in a large-scale MIMO orthogonal frequency division multiplexing system are effectively inhibited.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Anti-interval-interference base station downlink pre-coding method for multi-cell MIMO (Multiple-Input Multiple-Output) system
InactiveCN102255706AReduce data transfer volumeOvercoming LatencyError prevention/detection by using return channelError prevention/detection by diversity receptionChannel state informationCell synchronization
The invention discloses an anti-interval-interference base station downlink pre-coding method for a multi-cell MIMO (Multiple-Input Multiple-Output) system. The method comprises the following implementation steps of: 1, positioning a cell user by using a GPS (Global Positioning System) and judging whether the cell user is a central user or an edge user; 2, if the cell user is a central user, estimating channel state information (CSI) and feeding the CSI back to a base station; 3, if the cell user is an edge user, estimating CSI relative to a local cell base station and an interference base station, and feeding back the CSI to the local cell base station; 4, transmitting the CSI of the edge user between the base stations; and 5, computing a pre-coding matrix of the user with a zero-forcingpre-coding method on the base station with cell interference. According to the method, the data exchange amount between the base stations can be reduced, the accuracy of the CSI can be ensured, and realization of cell synchronization is facilitated; and the method can be applied to a fourth generation mobile communication system.
Owner:CHONGQING UNIV
Multi-user precoding method in coordinated multi-point system
InactiveCN102833047ALower Average Feedback OverheadImprove throughputSpatial transmit diversityError preventionZero-forcing precodingPacket scheduling
The invention discloses a multi-user precoding method in a coordinated multi-point system and mainly solves the problems of large average feedback cost and average return cost in the prior art. The multi-user precoding method comprises the following implementing steps that: a random vector is utilized to carry out quantization and generate a codebook and the codebook is prestored at user sides and a base station side; each user obtains a downlink channel vector of the user by channel estimation and calculates a single-link channel direction; each user selects a codeword serial number of the single-link channel direction and a corresponding channel quality indication according to the minimum distance criterion; each user compares the channel quality indication of the user with a preset threshold value to obtain a downlink feedback index vector of the user; a base station carries out packet scheduling on the users according to the feedback index vectors to obtain a final set of the users to be served; and the base station reconstructs a downlink channel matrix of the set of the users to implement the zero-forcing precoding of a transmitting terminal. According to the invention, the selective limiting feedback and the packet scheduling are combined, the average feedback cost and the average return cost of the system are greatly reduced and the multi-user precoding method can be used for the coordinated multi-point system with low cost.
Owner:XIDIAN UNIV
Correlation rotation precoding method applied to GFDM communication system
ActiveCN106330277ARealize comprehensive utilizationImprove bit error rate performanceSpatial transmit diversityTransmitter/receiver shaping networksSelf interferenceZero-forcing precoding
The invention discloses a correlation rotation precoding method applied to a GFDM communication system. The problem of relatively low symbol error rate transmission performance of a generalized frequency division multiplexing GFDM communication system in the prior art is mainly solved. The related rotation precoding method comprises the following specific steps: (1) constructing an autocorrelation matrix; (2) constructing a zero forcing precoding matrix; (3) constructing a correlation rotation matrix; (4) eliminating a multiplicative channel fading factor; (5) constructing a correlation rotation precoding matrix; (6) precoding; and (7) transmitting a to-be-transmitted symbol. The correlation rotation precoding method disclosed by the invention has the advantages of high symbol error rate performance, adverse effects caused by self-interference and multi-path channel interference can be simultaneously eliminated, the interference is utilized to improve the symbol error rate transmission performance of the generalized frequency division multiplexing GFDM communication system, meanwhile the precoding processing method of signals is simple and feasible, and the signal transmission requirements of users in a real environment can be satisfied in a multi-path channel scene.
Owner:XIDIAN UNIV
Inter-cluster interference elimination method based on airspace fine intensity high fractional beams
ActiveCN107579763ALow transfer rateIncrease transfer rateSpatial transmit diversityQuality of serviceZero-forcing precoding
The invention discloses an inter-cluster interference elimination method based on airspace fine intensity high fractional beams for mainly solving the problem of poor quality of service of cell edge users resulting from the ARSs overlapping phenomenon and the path loss in the prior art. The inter-cluster interference elimination method comprises the following steps: 1) selecting a collaboration area, and calculating a space correlation matrix; 2) calculating a first stage pre-beam forming matrix according to the space correlation matrix so as to calculate an equivalent channel dimension; 3) calculating an optimal spatial degree of freedom; 4) comparing the total degree of freedom with the maximum equivalent channel dimension, judging whether user clusters are suitable for interference alignment, if so, calculating a second stage interference alignment encoding and decoding matrix, and otherwise, calculating a second stage zero-forcing pre-encoding matrix; and 5) calculating a two-stagepre-encoding matrix in conjunction with the first stage encoding and the second stage encoding. According to the inter-cluster interference elimination method, the interference in the edge clusters is eliminated by alignment interference, the interference in central clusters is eliminated by zero-forcing pre-encoding, so that the throughput of the system is effectively improved, and the inter-cluster interference elimination method can be used for large-scale MIMO cellular networks.
Owner:XIDIAN UNIV
Downlink rateless code degree distribution and pre-coding combined optimization method for cloud access network
ActiveCN109245800AImprove throughput performanceSite diversityError preventionAccess networkParallel computing
The invention discloses a downlink rateless code degree distribution and pre-coding combined optimization method for a cloud access network. For a downlink multi-user access scene of the cloud accessnetwork, we propose a pre-coding matrix and rateless code output degree distribution combined optimized method under the limit of the single-antenna peak power at an RRU (Remote Radio Unit) with the help of zero-forcing pre-coding idea in a baseband processing unit pool. Through the combined optimization of the rateless code degree distribution and pre-coding in a downlink multi-user scene of thecloud access network, the method can improve the total throughput capacity of a system.
Owner:ZHEJIANG UNIV OF TECH
A partial zero-forcing precoding method in a multi-cell MU-MISO system
ActiveCN109039963AReduce multiplexing gainVerify accuracyRadio transmissionTransmitter/receiver shaping networksZero-forcing precodingZero force
The invention discloses a partial zero-forcing precoding method in a multi-cell MISO system. The method comprises the following steps: each base station uses its own spatial DoFs to perform zero-forcing precoding on users to be dispatched on the same frequency in the corresponding cell of the base station, wherein the sum of the number of subscribers K and c to be scheduled on the same frequency in the cell i corresponding to the base station i is less than or equal to the number of spatial DoFs of the base station i; c is the number of neighboring area users selected by the base station i forICI cancellation; 0<c <N / 2; and N is the number of antennas of the base station i. c neighboring area users are selected according to the rule that c neighboring area users with the strongest averageICI caused by the base station i or closest to the base station I are selected. The invention can eliminate the IUI of each user to other users of the cell and the ICI of a part of users of the neighboring cell.
Owner:PEKING UNIV
Intensive small cellular network user grouping and self-adaptive interference suppression method
ActiveCN106506109AReduce overheadReduce pollutionOrthogonal multiplexNetwork planningFrequency spectrumSpectral efficiency
The invention discloses an intensive small cellular network user grouping and self-adaptive interference suppression method. The intensive small cellular network user grouping and self-adaptive interference suppression method comprises the steps that: firstly, a central processing unit groups users by utilizing large-scale fading channel information of each user, the users in the same group use the same pilot frequency, and the users of different groups use different orthogonal pilot frequencies; secondly, each small cellular base station determines adjacent intergroup interference users by utilizing the large-scale fading channel information of the users, and estimates channel vectors of the adjacent users by utilizing received uplink pilot frequency; if intergroup interference users do not exist, an uplink can adopt maximum ratio combination (MRC) reception and a downlink can adopt maximum ratio transmission (MRT) precoding; and if the intergroup interference users exist, the uplink can adopt zero-forcing reception and the downlink can adopt zero-forcing precoding transmission, so as to eliminate intergroup interference. The intensive small cellular network user grouping and self-adaptive interference suppression method can reduce pilot frequency pollution and reduce system pilot frequency overhead by adopting the simple user grouping method; moreover, the small cellular base stations eliminate the intergroup interference in a self-adaptive manner, and can effectively improve the spectral efficiency of the system.
Owner:NANTONG RES INST FOR ADVANCED COMM TECH CO LTD
MU-MISO hybrid precoding design method based on multi-agent deep reinforcement learning
ActiveCN112260733ASpeed up explorationRaise priorityRadio transmissionNeural architecturesChannel state informationComputational simulation
The invention discloses an MU-MISO hybrid precoding design method based on multi-agent deep reinforcement learning, and the method is suitable for a downlink system in communication. According to themethod, a base station constructs a plurality of deep reinforcement learning agents used for calculating an analog precoding matrix, each agent comprises an action prediction network and an experiencepool with priority, and the agents share a centralized reward value prediction network and a centralized evaluation network to cooperatively explore an analog precoding strategy. The method comprisesthe following steps: enabling a base station to acquire channel state information of a plurality of users, inputting the user channel information into a constructed intelligent agent, and outputtinga corresponding analog precoding matrix; and calculating a digital precoding matrix containing the digital precoding vector of each user through zero-forcing precoding and a water injection algorithm.According to the method, the problems of high hybrid precoding design complexity and poor reachable rate performance in a large-scale MIMO system can be effectively solved, and the method has relatively high robustness to a channel environment.
Owner:SOUTHEAST UNIV
Method and device for precoding in wireless communication system
InactiveUS20130208825A1Reduce complexityCalculation is slowSpatial transmit diversityModulated-carrier systemsCommunications systemZero-forcing precoding
Provided is a method and a device for precoding in a wireless communication system. The method for precoding comprises the following steps: generating a first precoding matrix, W1, for deciding the transmission power of one transmission antenna from a plurality of transmission antennas as the maximum power per antenna; generating a zero forcing (ZF) precoding matrix, Ti, which does not influence the transmission antenna having the power which is decided as the maximum power per antenna, based on the (i−1)th precoding matrix Wi−1 (i=2,3, . . . ); determining a constant which has the transmission power of one transmission antenna from the rest of the transmission antennas, which do not have the transmission power as the maximum power per antenna, based on the Ti; and generating the
Owner:LG ELECTRONICS INC +1
Movement velocity-based antenna scale selection method applied in FDD large-scale MIMO system
ActiveCN108494457AImprove spectral efficiencyReduce overheadSpatial transmit diversityBaseband system detailsFrequency spectrumZero-forcing precoding
The invention discloses a movement velocity-based antenna scale selection method applied in an FDD large-scale MIMO system. The method comprises the steps that a user side feeds back a pilot signal toa base station side by adopting an analog feedback scheme, and the base station side estimates out a downlink channel; and data is transmitted through zero-forcing precoding, then the opened antennanumber is derived according to the movement velocity of a user and the spectral efficiency of the MIMO system, the relation between the movement velocity and the optimal antenna scale is obtained, andthe opened antenna scale is selected. According to the method, the ratio of channel estimation and feedback in coherence time can be reasonably adjusted according to the difference of the movement velocities of users, an optimal compromise is made between the transmit diversity gain and the channel estimation and feedback overhead, and then the spectral efficiency of the system is effectively improved.
Owner:XI AN JIAOTONG UNIV
Precoding method based on CSM (Cholesky-Decompositionand Sherman-Morrison lemma)
InactiveCN106027434AReduce computational complexityImprove performanceSpatial transmit diversityTransmitter/receiver shaping networksComputation complexityCommunications system
The embodiment of this invention discloses a precoding method based on CSM (Cholesky-Decompositionand Sherman-Morrison lemma). The method is applicable when an inversion matrix satisfies the form of W=H.HH+omega.I or the character of positive definite hermitian in precoding. The method provided in this invention uses regularized zero-forcing precoding algorithm to illustrate, and comprises the following steps: complete procedure declaration and theoretical proof (method process and theoretical proof of Cholesky decomposition and Sherman-Morrison formula), performance analysis of improved regularized zero-forcing precoding algorithm, and applicable situation and performance optimization of the structure given in the form of the embodiment. The method provided in this invention uses regularized zero-forcing precoding algorithm to illustrate, but is not limited to the algorithm; for example, this method is further applicable to MMSE (Minimum Mean Square Error) algorithm, and the like. The method provided by this embodiment of this invention effectively reduces the computation complexity of precoding in Massive MIMO (Multiple Input Multiple Output) communication system, improves the resultant velocity, reduces the bit error rate, and improves and optimizes the performance of this type of technology.
Owner:BEIJING UNIV OF POSTS & TELECOMM
Zero-forcing precoding frame time slot anti-collision method for RFID system
InactiveCN108052849AImprove throughputImprove label recognition rateMemory record carrier reading problemsSensing by electromagnetic radiationFrame timeAloha
The invention provides a zero-forcing precoding frame time slot anti-collision method for an RFID system and proposes a parallel anti-collision algorithm based on combination of zero-forcing precodingand a frame time slot ALOHA algorithm. Through the precoding technology, encoding is performed in advance before label transmission, so that error codes or collisions in a transmission and receivingprocess can be reduced. A simulation result indicates that when the total label number is 1000, the throughput rate is around 0.7 and is increased by about 83% compared with that of an ISE-BS algorithm, by about 20% compared with that of a DGBT algorithm, and by about 300% compared with that of an FSA algorithm. According to the invention, the throughput rate and the stability are improved and good application values are achieved in fields requiring quick identification of a large amount of labels.
Owner:JIANGXI UNIV OF SCI & TECH
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