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34results about How to "Increase reachable speed" patented technology
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Beam forming method and system for multi-user millimetre-wave communication system
InactiveCN105721033AIncrease reachable speedReduce complexitySpatial transmit diversityCommunications systemMillimetre wave
The invention belongs to the technical field of digital information, and provides a beam forming method and system for a multi-user millimetre-wave communication system. The beam forming method comprises the following steps of: performing beam forming training of a user side according to a preset beam forming training algorithm so as to obtain a beam forming training result; according to the beam forming training result, judging whether a conflict user side exists or not, wherein the conflict user side is a user side for downlink sending of a beam forming vector by adopting the same base station side; if so, selecting a beam forming vector pair to be subjected to downlink sending / receiving for the conflict user side so as to obtain a beam forming vector index to be subjected to downlink receiving of the conflict user side; and sending the beam forming vector index to be subjected to downlink receiving of the conflict user side to the conflict user side, such that the conflict user side searches the corresponding beam forming vector to be subjected to downlink receiving according to the received index. A conflict judging process is added into the traditional beam forming mechanism; therefore, the beam forming vector is re-selected for the conflict user side; and thus, the achievable rate of the conflict user side in the traditional beam forming training method is increased.
Owner:TSINGHUA UNIV
Direct-current offset optimization method of multi-carrier visible light communication system
ActiveCN103281273ASmall amount of calculationEasy to implementDc level restoring means or bias distort correctionClose-range type systemsOptimal designIntermediate variable
The invention discloses a direct-current offset optimization method of a multi-carrier visible light communication system. The optimization method aims at finding the direct-current offset Bdc which enables bit error probability of the system to be the lowest, and each subcarrier power sigma 2. The optimization method comprises the following steps: firstly confirming systematic parameters according to required indicators, hardware restrictions and the working environment, then setting intermediate variable a= Bdc / sigma, using an iterative algorithm for solving the lowest bit error probability aopt of the system, finally, considering a light power restriction condition and an electric power restriction condition, confirming the Bdc and the sigma 2 according to the aopt, and completing the optimal design of the system. The optimized method can rapidly and precisely obtain the optimal parameter design scheme, enables the visible light communication system based on DCO-OFDM to obtain the lowest bit error probability, achieves the biggest reachable speed rate, and meanwhile is small in calculated amount, easy to achieve and high in precision.
Owner:SOUTHEAST UNIV
Information energy cooperative beam forming method based on cognitive two-way relay network
InactiveCN107769823AIncrease reachable speedImprove service qualitySite diversitySpatial transmit diversityChannel state informationFrequency spectrum
The invention discloses an information energy cooperative beam forming method based on a cognitive two-way relay network. According to the invention, the secondary user sending ends of multiple antennas collect energy from the signals of a primary user according to a power allocation scheme so as to forward the signals of the primary user and send their own signals. The purpose of the invention isto design beam forming matrixes, vectors and power allocation factors suitable for secondary user sending ends, so that the achievable rate at each secondary user is enabled to be maximal. Herein, the ideal channel state information for all known links of the secondary user sending ends is considered, and an optimization scheme based on Charnes-Cooper translation and one-dimensional search is provided. Through introducing the semi-definite relaxation method, an original optimization problem is converted into a convex semi-definite optimization problem. After that, the interior point method isadopted to solve and obtain an optimal beam forming matrix and a vector. According to the invention, through the cooperation of the information and the energy, the spectrum and energy insufficient problem can be alleviated to a certain degree, so that the system performance is improved.
Owner:SUN YAT SEN UNIV
Downlink beam forming method and device of VLC (Visible Light Communication) MU-MISO (Multiple Users-Multiple Input-Single Output) system and VLC (Visible Light Communication) MU-MISO (Multiple Users-Multiple Input-Single Output) system
ActiveCN105721028AReduce resource requirementsReduce computational complexitySpatial transmit diversityClose-range type systemsMatrix optimizationOptoelectronics
The invention discloses a downlink beam forming method of a VLC (Visible Light Communication) MU-MISO (Multiple Users-Multiple Input-Single Output) system, and belongs to the technical field of visible light communication. According to the method, firstly, the optimization solution is carried out on a beam shaping matrix optimization model by a bi-level iterative method, thus obtaining an optimized beam shaping matrix; and then carrying out downlink beam forming according to the beam shaping matrix. The invention also provides a beam shaping matrix optimization model taking a maximum reachable rate as an optimization target. The invention also discloses a downlink beam forming device of the VLC (Visible Light Communication) MU-MISO (Multiple Users-Multiple Input-Single Output) system and the VLC (Visible Light Communication) MU-MISO (Multiple Users-Multiple Input-Single Output) system. Compared with the prior art, the method, the device and the system have the advantages of low hardware demand and the reachable rate of the system can be further improved.
Owner:SOUTHEAST UNIV
Full-duplex relay cooperative communication system performance optimization method based on NOMA
ActiveCN110212967AImprove SNRIncrease speedRadio transmissionDuplex signal operationSuperposition codingCommunications system
The invention belongs to the technical field of wireless mobile communication, and discloses a full-duplex relay cooperative communication system performance optimization method based on NOMA. The method comprises: a base station sending a superposition code to the relay node and the near-end user in a broadcast form; the relay node decoding the received signal and recoding and forwarding the received signal, and the relay node decoding signals of the near-end user and the far-end user from the received signal; the relay node recoding the decoded signal and broadcasting the coded mixed signalto a far-end user and a near-end user; the base station and the relay node pre-coding the signal in a maximum ratio transmission mode and sending the pre-coded signal to a near-end user; the near-enduser and the far-end user decoding the received signal; the near-end user decoding the received signal by adopting an SIC method; the far-end user directly decoding own signal; and minimizing the interruption probability of the system is minimized, and the minimum reachable rate of the system. According to the method, the rate of near-end users is improved, and the total reachable rate of the system is improved.
Owner:XIDIAN UNIV
IRS-assisted MISO system performance optimization method for hardware distortion
ActiveCN113364494AGood statistical propertiesReduce reachable rateTransmission monitoringRadio transmissionGaussian signalBroadcasting
The invention discloses an IRS-assisted MISO system performance optimization method for hardware distortion, and the method comprises the steps that a multi-antenna base station wide linear precodes messages of M information users, generates a baseband transmission signal, processes the baseband transmission signal into an asymmetric Gaussian signal, and generates an output signal through a high-power amplifier; with the assistance of an intelligent reflecting surface, the multi-antenna base station transmits the output signal generated by the high-power amplifier in a broadcasting manner, and controls the phase shift of a reflecting element in real time through a controller on the intelligent reflecting surface; the rates of M information users are decoded; and by taking the rates of the M information users as performance evaluation, a base station beam forming vector and a phase shift vector at an intelligent reflecting surface are optimized under the condition of satisfying the total power constraint of the base station, and the minimum reachable rates of the information users are maximized to complete performance optimization. According to the invention, the IGS is used for transmission, so that the reachable rate of the information user is further improved.
Owner:XI AN JIAOTONG UNIV
Multi-antenna base station transmission method and device independent of pilot frequency
ActiveCN107453797AHigh gainReduce huge overheadSpatial transmit diversityDuplex signal operationPrecodingChannel state information
The invention provides a multi-antenna base station transmission method and device independent of pilot frequency for solving a problem in the prior art that an increase in channel capacity is suppressed seriously because a required pilot and feedback overhead become unacceptable due to a substantial increase in the number of base station antennas. The pilot-independent multi-antenna base station transmission method comprises the following steps of: pre-defining a pre-coding vector set V = [v1, v2, ... vN] consisting of N pre-coding vectors; broadcasting all the pre-coding vectors in the pre-coding vector set V to all users one by one; and S103: calculating S scheduled users k1, k2 ... ks according to bits {a11, ... akn, ... aKN} fed back by all the users, enabling the system to allocate the pre-coding vectors vk1, vk2,..., Vks to the S scheduled users respectively, and enabling the system to use the pre-coding vectors vk1, vk2,... Vks to serve the S users simultaneously and respectively. The method and device do not depend on pilot, can be used as a transmission scheme of a large-scale multi-antenna system in a frequency division duplex mode, and significantly reduce the huge overhead required by the estimation and feedback of channel state information at a transmitting end in a traditional scheme.
Owner:TSINGHUA UNIV
A DC bias optimization method for multi-carrier visible light communication system
ActiveCN103281273BReduce bit error rateIncrease reachable speedDc level restoring means or bias distort correctionClose-range type systemsCarrier signalMulti carrier
The invention discloses a direct-current offset optimization method of a multi-carrier visible light communication system. The optimization method aims at finding the direct-current offset Bdc which enables bit error probability of the system to be the lowest, and each subcarrier power sigma 2. The optimization method comprises the following steps: firstly confirming systematic parameters according to required indicators, hardware restrictions and the working environment, then setting intermediate variable a= Bdc / sigma, using an iterative algorithm for solving the lowest bit error probability aopt of the system, finally, considering a light power restriction condition and an electric power restriction condition, confirming the Bdc and the sigma 2 according to the aopt, and completing the optimal design of the system. The optimized method can rapidly and precisely obtain the optimal parameter design scheme, enables the visible light communication system based on DCO-OFDM to obtain the lowest bit error probability, achieves the biggest reachable speed rate, and meanwhile is small in calculated amount, easy to achieve and high in precision.
Owner:SOUTHEAST UNIV
SWIPT system performance optimization method and system based on intelligent reflecting surface assistance
PendingCN114466390ACompensation DistortionCompensate for interferenceNetwork traffic/resource managementHigh level techniquesQuality of servicePathPing
The invention discloses a SWIPT system performance optimization method and system based on intelligent reflecting surface assistance, and the method comprises the steps: decoding information and collecting energy through a power divider at the same time, introducing RIS to compensate the serious path loss and shadow fading, and employing IGS to compensate the loss caused by unavoidable asymmetric hardware distortion; the objective is to maximize the minimum achievable rate of a user and a rate energy domain with weight by jointly optimizing active and passive beamforming vectors and a power distribution coefficient under the constraint of AP power budget and energy service quality requirements of the user. According to the method disclosed by the invention, the influence of the HWI and the interference among the users are compensated by adopting an asymmetric Gaussian signal scheme, the maximum rate and the minimum rate are remarkably improved, and the performance optimization problem of the SWIPT system assisted by the RIS with the HWI is solved.
Owner:XI AN JIAOTONG UNIV
Pilot scheme self-adaptive selection method of full-duplex bidirectional massive multiple input multiple output relay network
ActiveCN106027215AEasy to calculateQuick calculationCriteria allocationPilot signal allocationCoherence timeSelf adaptive
The invention provides a pilot scheme self-adaptive selection method of a full-duplex bidirectional massive multiple input multiple output relay network. The method comprises the steps of 1, establishing a symmetrical full-duplex bidirectional massive multiple input multiple output relay network; 2, sending state information to a relay by all user terminals; 3, collecting statistic information of large-scale fading between all users and the relay by the relay; and 4, self-adaptively selecting a first pilot scheme or a second pilot scheme by the relay through a calculation judgment system. According to the method provided by the invention, the prior statistic information of large-scale fading is applied; the calculation is convenient and rapid; the channel coherence time is utilized fully; and the reachable speed of the system is clearly improved.
Owner:SHANGHAI JIAO TONG UNIV
Approximate minimum bit error rate (BER) power distribution method for hybrid carrier system
InactiveCN107070623AImprove BER performanceAchieving joint optimizationCriteria allocationHigh level techniquesTime domainDistribution method
The invention discloses an approximate minimum bit error rate (BER) power distribution method for a hybrid carrier system, relating to an approximate minimum BER power distribution technology for the hybrid carrier system, and aiming to improve the BER performance of the hybrid carrier system and increasing the achievable rate of the system. The method comprises the following steps: at a transmitting terminal, performing alpha-order weighted fractional Fourier transform for data on each band to obtain the data in a frequency domain; in the frequency domain, performing power distribution operations for the data obtained in step 1, performing IFFT for the distributed data, transforming the data to a time domain, and sending the data to a channel; at a receiving terminal, performing FFT for the received data, and transforming the data back to the frequency domain; performing channel equalization in the frequency domain; after equalization, performing inverse operations of power distribution in the frequency domain; and performing -alpha-order fractional Fourier transform demodulation, and outputting the data. The approximate minimum BER power distribution method disclosed by the invention is suitable for powder distribution occasions in wireless communication.
Owner:HARBIN INST OF TECH +1
Frequency-mode-null state multi-dimensional hybrid modulation wireless communication signal method
ActiveCN108234380BIncrease reachable speedOvercome the number-limited problemMultiple carrier systemsMomentumMulti dimensional
The invention discloses a frequency-modal-empty state multi-dimensional hybrid wireless communication signal modulation method for further improving communication achievable rate. The method comprisesthe specific steps as follows: (1) binary bit stream blocking; (2) constellation modulating and mapping; (3) subcarrier, orbit angle momentum modal modulating; and (4) signal transmitting after spacemodulation. By using a three-dimensional modulation space formed by a transmitting antenna, the orbit angle momentum modal and the sub-carrier, three additional modulation dimensions are provided forthe traditional modulation method, the advantages of being low in system computing complexity and high in communication achievable rate are provided; and the communication achievable rate can be greatly improved even if the antenna number at the transmitting end is small.
Owner:XIDIAN UNIV
Communication system, method, device and storage medium
ActiveCN112994869AReduce transmission delayIncrease reachable speedCriteria allocationTransmission monitoringData packChannel state information
Provided in an embodiment of the present invention are a communication system, method, device and storage medium, the system comprising: a base station, a reflecting surface and a plurality of user terminals, each user terminal broadcasting a pilot signal; the base station receiving the first receiving signal, analyzing the first receiving signal, calculating to obtain corresponding channel state information, and further determining a target configuration parameter of the reflecting surface; the reflection surface adjusting self configuration according to the target configuration parameters to obtain an adjusted reflection surface; the base station encoding a plurality of pieces of data information to be sent into a data packet, and broadcasting a base station signal carrying the data packet; the adjusted reflecting surface receiving a second receiving signal, and reflection phase shift and reflection amplitude being applied to the second receiving signal to obtain a reflection signal; and each user terminal receiving the third receiving signal and decoding the third receiving signal to obtain the to-be-sent data information corresponding to the user terminal. Therefore, the transmission delay of the communication system is reduced under the condition that the bit error rate is controlled as much as possible.
Owner:THE CHINESE UNIV OF HONG KONG SHENZHEN
Average energy efficiency maximization power distribution method in delay insensitive D2D communication system
ActiveCN110278546AImprove energy efficiencyGuaranteed Average QoSHigh level techniquesMachine-to-machine/machine-type communication serviceChannel state informationComplete data
The invention discloses an average energy efficiency maximization power distribution method in a delay insensitive D2D communication system. The average energy efficiency maximization power distribution method comprises the following steps: firstly, a base station selecting cellular users through a scheduling algorithm and sharing frequency resources of the cellular users to a selected D2D link for use; then the dispatched and activated cellular users and D2D users feeding channel state information back to the base station; then, the base station calculating a power distribution scheme which enables the average energy efficiency of the D2D link insensitive to delay to be optimal according to the channel state information uploaded by the cellular users and the D2D users; and finally, the D2D link sending end completing data transmission according to the power distribution scheme. The method can be effectively applied to an actual scene, the average energy efficiency of cell edge users insensitive to delay is effectively improved according to the optimal power distribution scheme calculated by the base station, the D2D terminal power consumption is reduced, meanwhile, the interference of the D2D terminal power consumption to cellular users is restrained, and then the average spectrum utilization rate is improved.
Owner:SOUTHEAST UNIV
Resource management semi-parallel method in RIS-assisted user centralization cellular removal system based on DRL
PendingCN114364034AFast convergenceImprove stabilityArtificial lifeWireless communicationInteger non linear programmingParallel algorithm
The invention provides a deep reinforcement learning (DRL)-based semi-parallel method used in a reconfigurable intelligent surface (RIS)-assisted user centralized cellular removal (UCCF) system. According to the method, an optimization problem is decomposed into two iterative sub-tasks, namely an access point (AP) and user equipment (UE) association (AUA) sub-task and a transmit power and RIS reflection coefficient management (PRCM) sub-task. The method specifically comprises the following steps: adopting a binary particle swarm optimization (BPSO) algorithm for integer nonlinear programming AUA; for a PRCM of multi-continuous variable joint optimization, a parallel algorithm based on a DRL is provided, a double-delay depth deterministic strategy gradient (TD3) algorithm is adopted to improve convergence, and a new state preprocessing mechanism is provided. According to the method, a plurality of variables are optimized by adopting a DRL-based semi-parallel method, the limitation of solving an NP-hard problem by a traditional algorithm is overcome, the accuracy is improved, and meanwhile, the intelligent method can be quickly adjusted when facing environment change without a large amount of priori knowledge.
Owner:BEIJING UNIV OF POSTS & TELECOMM
Method for generating physical layer cooperation key when channels in wireless relay network have correlation
ActiveCN111787536AIncrease reachable speedEnsure safetySecurity arrangementHigh level techniquesPhysical layerTrunking
The invention discloses a method for generating a physical layer cooperation key when channels in a wireless relay network have correlation. The method is applied to a quasi-static channel multi-relaydouble-hop system model, and aims at the condition that an eavesdropping channel and a legal channel have correlation, a new cooperative key generation method is constructed, the method comprises twoparts of channel estimation and key negotiation, and the reachable rate of the finally generated key is improved on the premise of ensuring the security by extracting related information between a channel estimation value of an eavesdropping channel and a channel estimation value of a legal channel.
Owner:CHONGQING UNIV OF POSTS & TELECOMM
Aggregated VLC-RF system
ActiveCN110855314AImprove energy efficiencyIncrease reachable speedClose-range type systemsEngineeringPhotodiode
The invention provides an aggregation type VLC-RF system. The aggregation type VLC-RF system comprises a transmitter and a receiver, the transmitter comprises N light emitting diodes (LEDs) and M radio frequency (RF) transmitting antennas. The receiver comprises a photodiode PD and an RF receiving antenna. The system transmits information simultaneously through the VLC link and the RF link. According to the invention, a reachable rate expression is established under the constraints of peak optical power, average optical power and electric power. On the basis, an optimal power distribution scheme simultaneously meeting dimming control and power constraints is provided. And the optimal solutions of the single LED and the multiple LEDs under the inactive dimming control are given. When dimming control is in an active state, the SDR technology is further adopted to loosen the design problem of the optimal beam forming vector into convex SDP, and the problem can be effectively solved by using an interior point method.
Owner:CHINA UNIV OF MINING & TECH
Mode switching method for reducing training overhead in intelligent reflector-assisted communication system
ActiveCN113709070AReduce training overheadTake advantage ofChannel estimationRadio transmissionChannel state informationCommunications system
The invention discloses a mode switching method for reducing training overhead in an intelligent reflecting surface auxiliary communication system, the system comprises a single-antenna base station, a single-antenna user terminal and an intelligent reflecting surface consisting of N reflecting elements, and the single-antenna user terminal sends data to the single-antenna base station, a user-base station direct link is blocked by an obstacle, and data can only be sent to the single-antenna base station through the intelligent reflecting surface; a proper reflection scheme of the intelligent reflecting surface is determined by a controller, and the phase shift of the intelligent reflecting surface is dynamically adjusted so as to improve the achievable data rate of the system; and necessary information for phase shift adjustment can be obtained at the base station through uplink training and transmitted to a controller of the intelligent reflecting surface through a control link. According to the method, statistical and instantaneous channel state information is comprehensively utilized, an intelligent reflecting surface reflection scheme is properly selected, the training overhead can be effectively reduced, and the system performance is improved.
Owner:NANTONG RES INST FOR ADVANCED COMM TECH CO LTD +1
A Non-Orthogonal Multiple Access Communication System Based on Wireless Power Transmission
ActiveCN107017923BImprove performanceIncrease reachable speedNear-field transmissionCircuit arrangementsCommunications systemEnergy based
The invention discloses a non-orthogonal multiple access communication system based on wireless energy transmission. The communication system includes a multi-antenna energy base station, multiple sensor nodes and an information receiver, wherein: the energy base station is used for Energy beamforming technology transmits energy to each sensor node; any sensor node is used to use the received energy to send the collected information to the information receiver in a non-orthogonal multiple access mode; the information receiver is used to receive And decode the information collected by each sensor node. By applying the communication system provided by the embodiments of the present invention, the energy allocated by the energy base station to each sensor node is optimized, the energy can be distributed reasonably, the reachability rate from the sensor node to the information receiver is improved, and the complexity of the problem is reduced. Improves the performance of the entire communication system.
Owner:GUANGDONG UNIV OF TECH
A beamforming method and system for a multi-user millimeter wave communication system
InactiveCN105721033BIncrease reachable speedReduce complexitySpatial transmit diversityMillimeter wave communication systemsEngineering
The invention belongs to the technical field of digital information, and provides a beam forming method and system for a multi-user millimetre-wave communication system. The beam forming method comprises the following steps of: performing beam forming training of a user side according to a preset beam forming training algorithm so as to obtain a beam forming training result; according to the beam forming training result, judging whether a conflict user side exists or not, wherein the conflict user side is a user side for downlink sending of a beam forming vector by adopting the same base station side; if so, selecting a beam forming vector pair to be subjected to downlink sending / receiving for the conflict user side so as to obtain a beam forming vector index to be subjected to downlink receiving of the conflict user side; and sending the beam forming vector index to be subjected to downlink receiving of the conflict user side to the conflict user side, such that the conflict user side searches the corresponding beam forming vector to be subjected to downlink receiving according to the received index. A conflict judging process is added into the traditional beam forming mechanism; therefore, the beam forming vector is re-selected for the conflict user side; and thus, the achievable rate of the conflict user side in the traditional beam forming training method is increased.
Owner:TSINGHUA UNIV
Multi-antenna base station transmission method and device independent of pilot
ActiveCN107453797BHigh gainReduce huge overheadSpatial transmit diversityDuplex signal operationChannel state informationPrecoding
Owner:TSINGHUA UNIV
Mode switching method for reducing training overhead in intelligent reflective surface-assisted communication system
ActiveCN113709070BReduce training overheadTake advantage ofRadio transmissionChannel estimationChannel state informationCommunications system
The invention discloses a mode switching method for reducing training overhead in an intelligent reflective surface assisted communication system. The system includes a single-antenna base station, a single-antenna user terminal and an intelligent reflective surface composed of N reflective elements, wherein the single-antenna user terminal is directed to The single-antenna base station transmits data, but the user-base station direct link is blocked by obstacles, and the data can only be sent to the single-antenna base station through the smart reflector; the controller determines the appropriate reflection scheme for the smart reflector and dynamically adjusts its phase To increase the achievable data rate of the system; and the necessary information for phase shift adjustment can be obtained through uplink training at the base station and transmitted to the controller of the smart reflector through the control link. The method comprehensively utilizes statistics and instantaneous channel state information, and properly selects an intelligent reflection surface reflection scheme, which can effectively reduce training overhead and improve system performance.
Owner:NANTONG RES INST FOR ADVANCED COMM TECH CO LTD +1
Approximate Minimum Bit Error Rate Power Allocation Method for Mixed Carrier Systems
InactiveCN107070623BImprove BER performanceAchieving joint optimizationCriteria allocationHigh level techniquesTime domainDistribution method
The invention discloses an approximate minimum bit error rate (BER) power distribution method for a hybrid carrier system, relating to an approximate minimum BER power distribution technology for the hybrid carrier system, and aiming to improve the BER performance of the hybrid carrier system and increasing the achievable rate of the system. The method comprises the following steps: at a transmitting terminal, performing alpha-order weighted fractional Fourier transform for data on each band to obtain the data in a frequency domain; in the frequency domain, performing power distribution operations for the data obtained in step 1, performing IFFT for the distributed data, transforming the data to a time domain, and sending the data to a channel; at a receiving terminal, performing FFT for the received data, and transforming the data back to the frequency domain; performing channel equalization in the frequency domain; after equalization, performing inverse operations of power distribution in the frequency domain; and performing -alpha-order fractional Fourier transform demodulation, and outputting the data. The approximate minimum BER power distribution method disclosed by the invention is suitable for powder distribution occasions in wireless communication.
Owner:HARBIN INST OF TECH +1
VLC MU-MISO system downlink beamforming method and device and VLC MU-MISO system
ActiveCN105721028BReduce resource requirementsReduce computational complexitySpatial transmit diversityClose-range type systemsDownlink beamformingMatrix optimization
Owner:SOUTHEAST UNIV
A communication system, method, device and storage medium
ActiveCN112994869BReduce transmission delayIncrease reachable speedCriteria allocationTransmission monitoringData packChannel state information
Embodiments of the present invention provide a communication system, method, device, and storage medium. The system includes: a base station, a reflecting surface, and multiple user terminals, wherein each user terminal broadcasts a pilot signal; the base station receives the first received signal, By analyzing it, calculate its corresponding channel state information, and then determine the target configuration parameters of the reflective surface; the reflective surface adjusts its own configuration according to the target configuration parameters, and obtains the adjusted reflective surface; the base station sends multiple pieces of data to be sent The information is encoded into a data packet, and the base station signal carrying the data packet is broadcast; the adjusted reflector receives the second received signal, and the reflected signal is obtained by applying reflection phase shift and reflection amplitude to it; each user terminal is connected to the third The signal is received, and by decoding it, the data information to be sent corresponding to the user terminal is obtained. In this way, the transmission delay of the communication system can be reduced while controlling the bit error rate as much as possible.
Owner:THE CHINESE UNIV OF HONG KONG SHENZHEN
Adaptive Selection Method of Pilot Scheme in Full-duplex Bidirectional Large-Scale Antenna Relay Network
ActiveCN106027215BEasy to calculateQuick calculationCriteria allocationPilot signal allocationComputer terminalCoherence time
Owner:SHANGHAI JIAOTONG UNIV
Multi-relay opportunity beam forming method
ActiveCN113395099AAvoid situations where data cannot be receivedImprove performance saturation pointSpatial transmit diversityHigh level techniquesInformation transmissionTrunking
The invention discloses a multi-relay opportunity beam forming method. A signal sent by a transmitting end is amplified through relays and forwarded to a user of a receiving end; before data transmission, the system selects an optimal relay and an optimal user according to information fed back by the user, and then information transmission is carried out; in the transmission process, in order to maximize the reachable rate of the system, the system reasonably dispatches the power allocated to the relay and the power allocated to the user. According to the method, the performance saturation point of the system is improved, the situation that a user at a receiving end cannot receive data can be better avoided, the communication performance of the system is improved, the reachable rate in the system reaches the maximum, and high-speed communication is achieved.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
A method for maximizing average energy efficiency power allocation in a delay-insensitive d2d communication system
ActiveCN110278546BImprove energy efficiencyGuaranteed Average QoSHigh level techniquesMachine-to-machine/machine-type communication serviceChannel state informationCommunications system
Owner:SOUTHEAST UNIV
Hybrid precoding design method using single-bit analog-to-digital converter mimo system
ActiveCN108494455BReduce precisionReduce energy consumptionRadio transmissionHigh level techniquesPrecodingA d converter
The invention discloses a hybrid precoding design method using a single-bit analog-to-digital converter MIMO system. The scheme can combine a hybrid precoding structure and a low-precision analog-to-digital converter in the MIMO system to effectively reduce energy consumption of the MIMO system and implementation costs. The invention fully considers the hybrid precoding structure and the single-bit analog-to-digital converter structure, and performs mathematical modeling on them. In the application, the proposed iterative algorithm can be used to optimize the design of the analog precoder and the digital precoder to maximize the system's overall attainable rate. The present invention has the advantages of reducing system implementation cost and energy consumption, and maximizing the attainable rate of the whole system through the design of the digital precoder and the analog precoder. This advantage makes the proposed hybrid precoding design scheme have a wider range of application scenarios, thus making the MIMO system more feasible in practice.
Owner:TONGJI UNIV
Moving target tracking method based on adaptive beam
PendingCN114222312AIncrease reachable speedAvoid the impact of tracking accuracySpatial transmit diversityNetwork planningEngineeringComputer vision
The invention provides a moving target tracking method based on an adaptive beam, and aims to improve the tracking precision of a base station on a high-speed moving target and reduce the system overhead and time delay, and the method comprises the following implementation steps: constructing a moving target tracking scene, predicting the movement track of the moving target by the base station, and determining the optimal beam orientation; the base station calculates the optimal beam width, the base station calculates the number of code words in the codebook according to the optimal beam width and generates the codebook, the base station conducts self-adaptive adjustment on the beam, and the base station obtains the tracking result of the moving target. According to the invention, tracking is carried out by using the adaptive wave beam, so that the problem that the tracking precision is reduced due to sharp increase of the training frequency under the condition that the speed of the moving target is relatively high is avoided, the problems of high system overhead and long time delay in the prior art are solved, and the real-time performance of wave beam tracking is further improved.
Owner:XIDIAN UNIV
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