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47results about How to "Reduce the amount of feedback information" patented technology
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Hybrid automatic retransmitting method based on reliability, transmitting terminal and system thereof
InactiveCN101286825AReduce the number of retransmissionsImprove bit error rate performanceError prevention/detection by using return channelCorrect operation testingChannel encodingStart up
The invention relates to a method for realizing hybrid automatic retransmission based on reliability, which comprises that: channel coding codewords are divided into a plurality of groups and each group is a set comprising one or more coding bits; when a coding error exists at a receiving terminal, the receiving terminal chooses a group with minimum reliability from all groups of the present codewords; the receiving terminal feeds back the position information of the group with minimum reliability and negative acknowledgement NACK signals to a sending terminal and the sending terminal is notified of coding error existing at the receiving terminal so that to start up retransmission operation; the sending terminal retransmits all coding bits in groups corresponding to the position information and corresponding redundant versions according to the position information and NACK signals fed back from the receiving terminal.
Owner:PANASONIC CORP
Dynamic subcarrier associated limit bit feedback and dispatching method
InactiveCN101729457AReduce interactionHigh trafficError prevention/detection by using return channelMulti-frequency code systemsMultiplexingFrequency spectrum
The invention relates to a limit bit feedback and multiuser dispatching algorithm which comprises the following steps of: at the base station side, determining a loaded wave beam set for each subcarrier; at the user equipment side, obtaining the wave beam set information, forming an associated subcarrier on the basis of each subcarrier, calculating a channel quality estimation parameter of each wave beam, and determining the optimal wave beam and a key subcarrier; and if the channel quality corresponding to the optimal wave beam on the key subcarrier exceeds a scheduled threshold value, feeding a sequence number of the key subcarrier and the best wave beam number back to the base station side; and at the base station side, receiving the feedback information of the user equipment, expanding the feedback information of the key subcarrier to the associated subcarrier, determining a reference wave beam set adopted by the associated subcarrier on the basis of each subcarrier, and than carrying out the user dispatching on each wave beam, and finally carrying out the data transmission according to the selecting condition of the reference wave beam set and a user dispatching result. The invention has the advantages of less user feedback information amount, high feedback efficiency, large frequency spectrum multiplexing coefficient and high flexibility, simple realization, less signaling interaction between a user and a base station, and the like.
Owner:SHANGHAI JIAO TONG UNIV +1
MIMO telecommunication system and user sheduling method
InactiveCN1893308AIncrease system capacityReduce the amount of feedback informationSpatial transmit diversityMultiplex communicationSystem capacityComputer science
The MIMO communication system includes following parts: sending end in use for sending data frames including at least signal of channel estimation, and users' data; receiving end in use for receiving data frames sent from the sending end; using fading matrix of channel generates corresponding feedback signal of user, and restores users' data. The dispatching method for users includes following steps: (1) based on fading condition of channel between transmitting antenna and receiving antenna, the receiving end generates feedback signal, and sends the feedback signal to the sending end; (2) receiving the feedback signal, the sending end generates dispatching information based on the feedback signal, and uses the dispatching information to dispatch user. Based on change of channel condition, the invention can change information of dispatching user in real time so as to obtain higher system capacity.
Owner:DOCOMO BEIJING COMM LAB
Weighted broadcast retransmission method based on network coding
ActiveCN103580803AImprove transmission efficiencyReduce computational complexityError prevention/detection by using return channelWireless communicationDistribution matrixComputation complexity
The invention discloses a weighted broadcast retransmission method based on network coding. The weighted broadcast retransmission method based on network coding comprises the following steps of (1) building a weighted packet distribution matrix according to packet state information and link state information fed back by packets of receiving nodes, (2) selecting coded packets on a source node on the basis of the weighted packet distribution matrix, (3) sending the selected coded packets to the receiving nodes in a broadcast retransmission mode after the source node carries out XOR coding on the selected coded packets, (4) carrying out decoding on the coded packets through the receiving nodes after the receiving nodes receive the coded packets, feeding the state information of the decoded packets and the link state information of the decoded packets back to the source node, and (5) using the source node to judge whether transmission is accomplished or not according to the feedback information of the receiving nodes, and carrying out coding retransmission again when the transmission is not accomplished. According to the weighted broadcast retransmission method based on network coding, high transmission efficiency can be achieved through the low computation complexity in the network environment with an unbalanced link state, and the weighted broadcast retransmission method based on network coding can be widely applicable to various broadcast networks with the feedback function.
Owner:PLA UNIV OF SCI & TECH
Hybrid automatic request retransmission method, transmitter, receiver and communication system
InactiveCN101340271AImprove reliabilityImprove effectivenessError prevention/detection by using return channelCommunications systemDistribution characteristic
The invention provides a method, a system and a device for enhancing reliability and validity of HARQ and reducing bandwidth required by feedback information simultaneously. The method comprises the following steps: data which is sent from a transmitting end is demodulated and decoded by a receiving end; if an error is detected in the data sent from the transmitting end, the receiving end feeds back symbol position information that includes symbols with unreliable information bit to the transmitting end according to the distribution characteristics of the information bit in the symbols; the transmitting end obtains corresponding unreliable information bit in the data sent by the transmitting end according to the symbol position information which is fed back by the receiving end and the distribution characteristics of the information bit in the symbols, and retransmits the unreliable information bit.
Owner:NTT DOCOMO INC
Pre-coding method based on channel information covariance and cooperative communication method
InactiveCN104393964AEnhanced inhibitory effectIncrease data transfer rateSite diversitySpatial transmit diversityInterference (communication)Communications system
The invention discloses a pre-coding method based on a channel information covariance. The pre-coding method comprises the following steps that global channel information in a multi-cell multi-antenna interference communication system is measured to obtain a channel covariance matrix and system noise power, and the channel covariance matrix and the system noise power are transmitted to a first base station to process uniformly; the first base station carries out setting of a current iteration index and initializes the channel covariance matrixes of all users according to the number of the users of the system; the optimal transmitting power and maximum signal to interference and noise ratios of all users are computed one by one according to the covariance matrix corresponding to each user; and the covariance matrixes corresponding to all users and the current iteration index are updated until the SINR (Signal to Interference and Noise Ratio) converges, the first base station obtains an optimal covariance matrix set of the system and a corresponding optimal pre-coding matrix set, and transmits all pre-coding matrixes to other corresponding base stations. The invention also provides a cooperative communication method, which has the advantages of small amount of information and less system expenditure.
Owner:SHANTOU UNIV
Method and system for realizing antenna selection in MIMO relay system
InactiveCN102340340AReduce the amount of feedback informationReduce Design ComplexitySpatial transmit diversityTransmitter/receiver shaping networksSignal-to-noise ratio (imaging)Engineering
The invention discloses a method and a system for realizing antenna selection in an MIMO relay system. Antenna selection is respectively carried out on a relay node and a source node according to a signal to noise ratio; the corresponded relay node and the corresponded source node are respectively notified by the selected transmitting antennas; and then the relay node and the source node respectively use the notified transmitting antennas to carry out signal emission. According to the method and the system provided in the invention, it can be ensured that a relay node and a source node only select one antenna among a plurality of antennas for signal emission, wherein the relay node and the source node are utilized as emission nodes; and a feedback information contents, which is obviously less than that in a traditional technical scheme, can be generated, so that a design complexity can be effectively reduced.
Owner:ZTE CORP
Method for sensing interception node selected by radio system
InactiveCN101572722AReduce in quantityImprove the shortcomings of poor self-adaptationReceivers monitoringTime informationCustomer-premises equipment
The invention discloses a method for sensing an interception node selected by a radio system. The radio system comprises a plurality of base stations and a plurality of user station equipment, wherein the base stations are used as judgment nodes, and the user station equipment is used as interception nodes. The method comprises the following steps: the judgment notes count the N time interception information of the whole interception node and groups the interception nodes according to the relativity of the interception information; detection judgment is made according to the interception information of the whole interception node at the stage; at least one interception node is selected from each group of the interception nodes as a group header interception node to feed back P time information to the judgment notes; and the judgment notes carry out data fusion processing and make detection judgment according to the selected feedback interception information of the group header interception node. The invention provides an interception mechanism based on the relativity of CPEs historic interception information statistics so as to reduce the number of CPEs participated in feedback, thereby effectively reducing the feedback information amount when the detection probability is not reduced, and the error alarming probability is not improved.
Owner:SHANGHAI RES CENT FOR WIRELESS COMM
Wireless communication apparatus, and feedback information generating method
InactiveCN101167267AHigh precision reproductionReduce the amount of feedback informationSpatial transmit diversityMultiplex communicationPhase ratioEngineering
A wireless communication apparatus that allows propagation path information to be reproduced with high precision at a transmitting end without increasing feedback information amount. In this apparatus, a channel estimating part (103) uses a received pilot signal to perform channel estimation for each propagation path. A correlation detecting part (104) uses the result of the channel estimation to obtain correlation values between the channels, thereby detecting correlation values of all channels. An amplitude / phase ratio determining part (105) determines, based on the correlation values, the quantization bit ratio of the amplitude and phase of propagation path information to be used when those amplitude and phase are quantized. A feedback information generating part (106) quantizes the propagation path information in accordance with the determined ratio of the amplitude and phase.
Owner:PANASONIC CORP
Multi-cell mmWave large-scale MIMO beam selection method based on beam discovery signal
ActiveCN106972877ASuppress beam interferenceReduce the computational complexity of beam selectionSpatial transmit diversityInterference problemCell ID
The invention relates to the technical field of multi-cell mmWave large-scale MIMO beamforming, and discloses a multi-cell mmWave large-scale MIMO beam selection method based on a beam discovery signal. A user performs related operations on a BDS and user local ZC sequence set constructed by a ZC sequence in each beam selection period one by one so as to acquire a ZC sequence root index corresponding to a user optimal beam; and then a received signal is descrambled to acquire a service mmWave cell ID corresponding to the optimal beam; finally, the user feeds back a determined beam index to a service cell; and meanwhile, the invention designs a multi-cell partial beam interference inhibition algorithm aiming at a beam interference problem between mmWave cells, the user processes the received signal so as to acquire the optimal beam and a strong interference beam of the user, the complexity of a beam selection algorithm is greatly lowered, and the inter-cell beam interference is effectively lowered.
Owner:CHONGQING UNIV OF POSTS & TELECOMM
Network access point selection method of LWA (LTE WLAN Aggregation) system based on OWMAD (Optimal weighted multi-attribute decision)
ActiveCN109526042AReduce loadGuaranteed QoS requirementsAssess restrictionTransmission monitoringFrequency spectrumOptimal weight
The invention relates to a network access point selection method of an LWA (LTE WLAN Aggregation) system based on OWMAD (Optimal weighted multi-attribute decision), and belongs to the field of mobilecommunication. The method includes the following steps: S1, in a network access point selection period, firstly acquiring an eNBs set S<L><k> and an APs set S<W><k>, which can be used for selection inthe current network access point selection period, by a network end according to information fed back by UE; S2, respectively measuring attribute values of attribute sets of the network access pointcandidate subsets S<L><k> and S<W><k>, forming a decision matrix A<NxM> of the attribute values, and carrying out standardization thereon to obtain a decision standardization matrix R<NxM>; S3, calculating an attribute optimal weight vector omega<+> of a current network access point; S4, calculating a weighting value vector f<+> of each network access point; and S5, sorting weighting values, obtaining a network access point b<*> of a smallest weighting value by solving, and executing access point connection. The method can improve a frequency spectrum utilization rate of the LWA system, reduceloads of eNB, and ensure QoS requirements of UE (User Equipment), and simplifies an access point selection process.
Owner:CHONGQING UNIV OF POSTS & TELECOMM
Text sequence generation method and system
ActiveCN111046178AImprove build qualityFast convergenceNatural language data processingNeural architecturesFeature vectorAlgorithm
The embodiment of the invention provides a text sequence generation method and system. A adversarial network model comprises a generator and a discriminator; the generator comprises a feature feedbacknetwork module and is used for calling high-order features from the discriminator so as to generate a guidance feature vector; the generator generates a next word of the pre-output text sequence based on the guidance feature vector; the discriminator updates the high-order features according to the newly constructed pre-output text sequence and the initial text sequence; the above steps are iteratively executed until the total number of words of the newly constructed pre-generated text sequence reaches a set threshold, the total number of words is input into a discriminator for discrimination, and an update gradient is calculated according to a classification discrimination result; parameters of the generator are updated according to the updating gradient; and the above steps are iteratively executed until the generator and the discriminator converge, and a target text sequence is output. According to the embodiment of the invention, the feature conversion feedback module is added, and the feature vector extracted by the discriminator is transmitted to the generator as a guide signal, so that the generation quality of the generator is improved.
Owner:BEIJING UNIV OF POSTS & TELECOMM +2
Speed-free mode-based frame level encoding and decoding method
InactiveCN101741516AReduce bandwidth requirementsImprove transmission capacityError preventionDecoding methodsBandwidth requirement
The invention belongs to a speed-free mode-based frame level encoding and decoding method in the technical field of communications, which comprises the following steps: framing, frame processing, frame encoding and transmitting, addition of a frame identification number, and signal processing and transmitting at a transmitting end, and signal receiving and conventional signal processing, frame detecting, decoding and sending a system frame into a sink at a receiving end. Because main operation of the receiving end is performed on an error frame, the error frame can be recovered by a simple decoding method, and the transmission capacity of the system is effectively improved. However, due to the adoption of the speed-free code technology, the receiving end unnecessarily feeds back any otherinformation to the transmitting end except sending a termination signal when the receiving is finished; the encoding permits a lot of error frames to participate; the error frames are not required tobe continuous; and the error correcting capability is improved. Therefore, the speed-free mode-based frame level encoding and decoding method has the characteristics of low encoding and decoding complexity, strong error correcting capability, extremely less feedback information required, low requirement on the bandwidth of a feedback link, high transmission capacity of the system, high transmission efficiency and reliability, and the like.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Large-scale MIMO collaborative user scheduling method
ActiveCN106028462AReduce computational complexityReduce the number of usersSpatial transmit diversityBaseband system detailsCorrelation coefficientChannel state information
The invention discloses a large-scale MIMO collaborative user scheduling method for mainly solving the problem that in the prior art a spectrum efficiency of a system is reduced as state information of a channel is compressed or quantified. The implementation steps of the method are as follow: 1, a base station sends training sequences to users, and the users estimate channel information according to received signals and the sent training sequences; 2, the users in the system are grouped, and a timer is set for the users; 3, the user with the maximal channel norm is found by the timer, and the channel state information of the user is broadcasted to the other users in the same group; 4, correlation coefficients between the other users in the same group and the user with the maximal channel norm are computed, and the users of which the correlation coefficients are less than a given threshold of the system feeds back the channel state information of the users to the base station; and 5, the base station computes a set of users to send, and sending signals after being subjected to beam forming are sent to the users. According to the method, under the premise of small influence on the system and speed, the feedback quantity of the system is effectively reduced, and downlink resources of the system are effectively improved.
Owner:XIDIAN UNIV
Hybrid automatic retransmission request feedback method and device and data receiving device
ActiveCN109451800AInformation optimizationReduce the amount of feedback informationError prevention/detection by using return channelSignal allocationCarrier signalComputer engineering
The present disclosure relates to a HARQ feedback method and device, a method and device for determining data to be retransmitted, a data receiving device, a data transmitting device, and a computer readable storage medium. The HARQ feedback method includes: grouping a carrier unit CC according to a binding rule, wherein the binding rule includes the number of resource units included in a CC thatcan be bound into a group; calculating a parameter value in each CC group; generating a HARQ codebook with the same number as the CC groups, wherein the length of the HARQ codebook is determined by the parameter value in the corresponding CC group and the maximum resource unit number included in a single CC in the corresponding CC group; and feeding the HARQ codebook back to a data transmitting end. In the embodiment of the present disclosure, by grouping the carrier units CC according to the binding rule, calculating the parameter value in each CC group, and generating the HARQ codebook having the same number of CC groups, the amount of feedback information is optimized, and the amount of feedback information is reduced.
Owner:BEIJING XIAOMI MOBILE SOFTWARE CO LTD
Limited feedback method in multi-point coordinated transmission scenario and system
InactiveCN102624482AEnsure fairnessReduce the amount of feedback informationSpatial transmit diversityError preventionSignal-to-interference-plus-noise ratioInformation quantity
The invention discloses a limited feedback method in a multi-point coordinated transmission scenario and a system. The method includes dividing districts in a coordinated region of a multi-point coordinated [CoMP (coordinated multi-point)] system into two categories; selecting one district and defining the district as a main district, calling other districts as auxiliary districts, and determining the main district in a polling manner; adopting different feedback mechanisms for users in the districts divided into the two categories; and realizing information feedback only for the users with normalized signal to interference plus noise ratios (SINR) higher than a feedback threshold in the main district, and realizing information feedback only for the users with grades of interference, to the feedback users in the main district, lower than a given value in the auxiliary districts. By the aid of the limited feedback method and the system in the technical scheme, the quantity of the feedback information to the users can be effectively reduced on the premise of guaranteeing fairness among the users and suppressing same-frequency interference.
Owner:BEIJING UNIV OF POSTS & TELECOMM
Self-adaptation feedback method and system based on threshold judgment
InactiveCN103188057AReduce the amount of feedback informationReasonable and efficient feedback mechanismError prevention/detection by using return channelNetwork traffic/resource managementQuality of serviceFrequency spectrum
The invention discloses a self-adaptation feedback method. A base station sets initial values of a feedback threshold respectively for a coordinated multi-point (CoMP) terminal and a non-CoMP terminal and sends the initial values of the feedback threshold to all terminals. The station classifies the terminals into a high priority user and a low priority user and sends indication information to the terminals. In a preset adjustment period, the terminals feed information back according to the initial values of priority and the feedback threshold. After the adjustment period is due, the station adjusts the feedback threshold in a self-adaptation mode according to a response rate of the terminals and a signal to interference plus noise power ration curve and sends the feedback threshold to all terminals to continuously carry out information feedback. The invention further discloses a system. By means of the self-adaptation feedback method and the system, feedback information quantity of user terminals can be reduced under a premise that quality of service (QoS) demands of the terminals, fairness among the terminals and system frequency spectrum efficiency are achieved.
Owner:ZTE CORP
Channel information feedback method of beam shaping system with Mt*2MIMO (Multiple Input Multiple Output) characteristic
InactiveCN102013907ABig spaceImprove transmission efficiencySpatial transmit diversitySingular value decompositionSystem capacity
The invention relates to a channel information feedback method of a beam shaping system with a Mt*2MIMO (Multiple Input Multiple Output) characteristic, which only needs to feed back characteristic values lambda 1and lambda2 and a characteristic vector v1. The method particularly comprises the steps of: estimating a channel matrix H of a descending wireless channel by a user equipment terminal MS (Memory System); carrying out SVD (singular value decomposition) on the H by the user equipment terminal MS to obtain the lambda 1, the lambda 2 and the v1; quantizing and feeding back the lambda 1, the lambda2 and the v 1 by the user equipment terminal MS; solving a v 2 through v2=eigvec2[HHH] by using a formula HHH=lambda 1v1v1H+lambda2(E-v1v1H) by a base station BS on the basis of the feedback information quantity of the user equipment terminal MS; carrying out beam forming by adopting V=[v1H, v2H]H by the base station BS; and completing the channel information feedback method of the beam shaping system with the Mt*2MIMO characteristic. The invention ensures that the MIMO beam shaping system obtains greatest system capacity and space diversity gain and simultaneously reduces channel feedback information capacity, improves the transfer effectiveness of the MIMO beam shaping system, and enhances the practicability of the MIMO beam shaping system.
Owner:INST OF ACOUSTICS CHINESE ACAD OF SCI
Method for reducing link self-adaptation feedback information amount, wireless telecommunication equipment and wireless telecommunication system
InactiveCN103546206AReduce the amount of feedback informationSpatial transmit diversityError preventionCommunications systemSelf adaptive
The invention provides a method for the reducing link self-adaptation feedback information amount. According to the method, the total throughput amount under all situations is computed through the hypothesis on the number of orders and traversal of MCS combination; in all total throughput amount corresponding to selected pre-encoding matrix combination, a sending party tells the pre-encoding matrix combination corresponding to the largest total throughput amount and the MCS combination to a receiving party. The invention further provides corresponding wireless telecommunication equipment and a wireless telecommunication system. According to the technical scheme, the total information feedback amount in an MIMO system can be reduced greatly.
Owner:YULONG COMPUTER TELECOMM SCI (SHENZHEN) CO LTD
Interference alignment method and system
InactiveCN107769895AReduce the amount of feedback informationImprove performanceBaseband system detailsRadio transmissionChannel state informationUser equipment
The invention discloses an interference alignment method and system. The interference alignment method comprises that each base station determines an interference matrix according to the channel interference condition of each user equipment (UE) at present, and works out an emission precoding matrix correlated to strong interference according to the interference matrix, and emits a signal to the UE by means of the emission precoding matrix; after receiving the signal, each UE estimates a CSI and obtains a CSI estimation result of another UE; an emission precoding matrix in interference alignment is estimated by means of all channel state information estimation results obtained at present through a maximum SINR method; a codebook which is most strongly correlated to the estimated emission precoding matrix is determined, and an index of the codebook is reported to the base station; the base station reconstructs the precoding matrix according to the received index, and takes the reconstruction result as a new emission precoding matrix of the base station; the UE is triggered to estimate the CSI; and each UE works out a reception processing matrix of the UE through the maximum SINR method according to the CSIs estimated by the UE and the other UE. According to the invention, advantages of interference alignment can be effectively achieved, and the interference alignment method andsystem are easy to implement.
Owner:POTEVIO INFORMATION TECH
Multi-channel circulating oil supply valve
PendingCN113137497AStrong expandabilityAchieve the effect of one use and one preparationOperating means/releasing devices for valvesMultiple way valvesEngineeringMechanics
The invention discloses a multi-channel circulating oil supply valve. The oil supply valve comprises a rotating core and a stator arranged on the rotating core in a sleeved mode, the outer wall of the rotating core is in liquid sealing fit with the stator, a metering cavity is formed in the stator, a piston is arranged in the metering cavity and divides the metering cavity into a first cavity and a second cavity, 4N liquid passing openings are formed in the peripheral side of the inner wall of a rotating core cavity at equal intervals, 4N liquid outlets are formed in the peripheral side, corresponding to the section where the liquid outlets of a liquid-outlet pipe are located, of the inner wall of the rotating core cavity at equal intervals, 2N outlets are formed in the stator, every two opposite liquid outlets communicate with one outlet through a pipeline, and a rotating control device controls the rotating core to rotate 360 / 4N degrees each time. According to the oil supply valve, an oil-outlet annular groove in the outer diameter of an original rotating core is omitted, then multiple sets of oil-outlet pore channels are formed in the position of the original annular groove, namely the stator (a valve body) matched with the original annular groove, and one-valve multi-point quantitative oil supply can be achieved through the multiple sets of oil-outlet pore channels.
Owner:周一平 +1
Dynamic subcarrier associated limit bit feedback and dispatching method
InactiveCN101729457BReduce interactionHigh trafficError prevention/detection by using return channelMulti-frequency code systemsMultiplexingFrequency spectrum
Owner:SHANGHAI JIAOTONG UNIV +1
A network access point selection method for lwa system based on owmad
ActiveCN109526042BReduce loadGuaranteed QoS requirementsAssess restrictionTransmission monitoringComputer networkData mining
The invention relates to a method for selecting a network access point of an OWMAD-based LWA system, which belongs to the field of mobile communication. The method includes the following steps: S1: in the network access point selection period, the network side first obtains the eNBs set and the APs set that can be selected in the current network access point selection period according to the information fed back by the UE S2: measure the network access point respectively The attribute value of the input point candidate subset and the attribute set forms the decision matrix A of the attribute value N×M , and normalize it to get the decision normalization matrix R N×M ; S3: Calculate the attribute optimal weight vector ω of the current network access point + ; S4: Calculate the weighted value vector f of each network access point + ; S5: Sort the weighted values to find the network access point b with the smallest weighted value * , and perform an access point connection. The invention can improve the frequency spectrum utilization rate of the LWA system, reduce the load of the eNB, ensure the QoS requirement of the UE, and simplify the selection process of the access point.
Owner:CHONGQING UNIV OF POSTS & TELECOMM
Method, device, and system for mobile communication
InactiveCN104641571AReduce the amount of feedback informationImprove throughputError prevention/detection by using return channelSpatial transmit diversityData streamModulation coding
Provided in the present invention is a method for mobile communication. The method comprises: modulating and coding an M-number of primary data streams on the basis of a modulation and coding scheme to acquire an M-number of modulated data streams, where M is a positive integer greater than 1 and M is no greater than the number of antennae; symbol mapping respectively the M-number of modulated data streams to generate an M-number of mapped data streams; mixing the M-number of mapped data streams to generate an M-number of mixed data streams; and, transmitting the M-number of mixed data streams respectively on the different antennae to a terminal. The method allows for reduced signaling overhead and for reduced system feedback overhead.
Owner:HUAWEI TECH CO LTD
Method of orthogonal FDM for modulatng sub-carrier separation and sub-band cross arrangement
InactiveCN100512249CBoth needsReduce the amount of feedback informationMulti-frequency code systemsOrthogonal multiplexCarrier signalEngineering
The invention relates to a method for sub-carrier division and sub-band cross arrangement of orthogonal frequency division multiplexing modulation, which is used in the technical field of digital information transmission. The present invention utilizes the characteristics of periodic fading of frequency selective channels to divide OFDM subcarriers into two types of sub-bands arranged crosswise, and distribute them to two types of users. One type of users adopts adaptive allocation technology, and the other One type of user adopts OFDM modulation transmission technology, and the two types of sub-bands are arranged alternately to occupy all effective data sub-carriers, and the data of the two types of users are mapped to their corresponding sub-carriers at the transmitter. The method reduces the amount of system feedback information required for adaptive subcarrier allocation, and at the same time takes into account the needs of general voice users.
Owner:SHANGHAI JIAOTONG UNIV
Channel information feedback method of beam shaping system with Mt*2MIMO (Multiple Input Multiple Output) characteristic
InactiveCN102013907BBig spaceImprove transmission efficiencySpatial transmit diversitySingular value decompositionSystem capacity
The invention relates to a channel information feedback method of a beam shaping system with a Mt*2MIMO (Multiple Input Multiple Output) characteristic, which only needs to feed back characteristic values lambda 1and lambda2 and a characteristic vector v1. The method particularly comprises the steps of: estimating a channel matrix H of a descending wireless channel by a user equipment terminal MS (Memory System); carrying out SVD (singular value decomposition) on the H by the user equipment terminal MS to obtain the lambda 1, the lambda 2 and the v1; quantizing and feeding back the lambda 1, the lambda2 and the v 1 by the user equipment terminal MS; solving a v 2 through v2=eigvec2[HHH] by using a formula HHH=lambda 1v1v1H+lambda2(E-v1v1H) by a base station BS on the basis of the feedback information quantity of the user equipment terminal MS; carrying out beam forming by adopting V=[v1H, v2H]H by the base station BS; and completing the channel information feedback method of the beam shaping system with the Mt*2MIMO characteristic. The invention ensures that the MIMO beam shaping system obtains greatest system capacity and space diversity gain and simultaneously reduces channel feedback information capacity, improves the transfer effectiveness of the MIMO beam shaping system, and enhances the practicability of the MIMO beam shaping system.
Owner:INST OF ACOUSTICS CHINESE ACAD OF SCI
Beam arrival angle-based multiuser scheduling scheme
ActiveCN101969328BGet rid of scheduling thinkingIncrease channel capacitySpatial transmit diversityBaseband system detailsChannel state informationComputation complexity
The invention discloses a beam arrival angle-based multiuser scheduling scheme, which mainly comprises the following three steps of: 1) estimating the beam arrival angle; 2) dividing user subsets based on the beam arrival angle; and 3) selecting the optimal user in each subset. If a total user number is K, and a scheduling user number is M, an algorithm reduces the complexity to 2 K, ensures small loss of the performance, and is a low-computation suboptimal algorithm. Compared with the conventional user scheduling algorithm, the beam arrival angle-based multiuser scheduling scheme performs user scheduling according to long-term statistical information of a channel, has low computation complexity, low dependence on the instantaneous channel state information of a user, and higher robustness aiming at the time variability of a wireless channel, and can remarkably reduce the feedback information amount required by a system. Besides, a user channel scheduled by the scheme of the invention statistically has excellent orthogonality, and effectively improves the accessible channel capacity of the system.
Owner:SOUTHEAST UNIV
Channel measuring method for LTE (Long Term Evolution) system
InactiveCN102571284BReduce delivery volumeReduce the amount of feedback informationError preventionTransmission path multiple useResource utilizationReal-time computing
The invention discloses a channel measuring method for a LTE (Long Term Evolution) system. The method is suitable for a CoMP working mode and comprises the following steps that: a base station marks off a reference mark placement region in a PDSCH (Physical Downlink Shared Channel), sets a plurality of reference marks in the reference mark placement region and sets a resource configuration mode with an identifier for each signal launching point in the CoMP; a terminal carries out channel measurement on each signal launching point according to the resource configuration modes and position information of the reference mark placement region, which re sent by the base station; the terminal feeds back the identifiers of the selected resource configuration modes which meet preset conditions to the base station; and the base station searches the corresponding signal launching points according to the identifier of the resource configuration modes, which are fed back by the terminal, and carries out channel measurement on the signal launching points by using CSI-RS (Channel State Indication Reference Signal) resources. According to the method provided by the invention, the problem of CSI-RS resource tension in the existing CoMP mode can be solved and the resource utilization rate of the PDSCH is improved.
Owner:沈阳市联盛科技有限公司
An adaptive feedback method and system based on threshold judgment
InactiveCN103188057BReduce the amount of feedback informationReasonable and efficient feedback mechanismError prevention/detection by using return channelNetwork traffic/resource managementQuality of serviceFrequency spectrum
The invention discloses a self-adaptation feedback method. A base station sets initial values of a feedback threshold respectively for a coordinated multi-point (CoMP) terminal and a non-CoMP terminal and sends the initial values of the feedback threshold to all terminals. The station classifies the terminals into a high priority user and a low priority user and sends indication information to the terminals. In a preset adjustment period, the terminals feed information back according to the initial values of priority and the feedback threshold. After the adjustment period is due, the station adjusts the feedback threshold in a self-adaptation mode according to a response rate of the terminals and a signal to interference plus noise power ration curve and sends the feedback threshold to all terminals to continuously carry out information feedback. The invention further discloses a system. By means of the self-adaptation feedback method and the system, feedback information quantity of user terminals can be reduced under a premise that quality of service (QoS) demands of the terminals, fairness among the terminals and system frequency spectrum efficiency are achieved.
Owner:ZTE CORP
Scheduling method of coordinated multi-point (CoMP)
InactiveCN102480791BAvoid interferenceImprove performanceTransmissionWireless communicationComputer networkEngineering
Owner:POTEVIO INFORMATION TECH CO LTD
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