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Joint power allocation and residual U-Net channel estimation in active IRS-assisted near-field multi-user uplink systems 认领 引用
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作者 Wei Gao Xinji Guo +3 位作者 Yan Wang Jingdie Xin Jinbing Jiang Feng Shu 《Intelligent and Converged Networks》 EI 2026年第2期166-182,共17页
In this paper,the channel estimation(CE)problem in multi-user hybrid-field communication systems enhanced by an active intelligent reflecting surface(IRS)is investigated.To effectively characterize the spatially non-s... In this paper,the channel estimation(CE)problem in multi-user hybrid-field communication systems enhanced by an active intelligent reflecting surface(IRS)is investigated.To effectively characterize the spatially non-stationary characteristics of large-scale active IRS under hybrid-field propagation,the uniform linear array of the active IRS is partitioned into multiple sub-blocks.Each user is assumed to be in the far-field region of each sub-block while remaining in the near-field region of the entire IRS,which enables dimensionality reduction in channel modeling and alleviates computational complexity.Moreover,under the total power constraint between the users and the active IRS,a closed-form solution for the optimal power allocation factor is rigorously derived.Furthermore,a novel multi-user pilot transmission strategy is designed,based on which efficient least squares(LS)estimators are developed for both the direct and cascaded links.To further enhance estimation performance,a deep learning based CE framework is proposed by integrating residual blocks into a U-Net architecture.The proposed network leverages the encoder–decoder pathway and skip connections for hierarchical feature extraction,while the residual modules strengthen representational capability and facilitate gradient propagation.Simulation results demonstrate that the proposed deep learning based estimator significantly outperforms conventional LS and minimum mean square error(MMSE)methods in terms of estimation accuracy,while reducing pilot overhead by seven-eighths. 展开更多
关键词 channel state information(CSI)sensing active intelligent reflecting surface(IRS) near-field(NF) power allocation multi-user
Chasing in virtual environment:Dynamic alignment for multi-user collaborative redirected walking 认领 引用
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作者 Tianyang DONG Shuqian LV +1 位作者 Hubin KONG Huanbo ZHANG 《虚拟现实与智能硬件（中英文）》 EI CSCD 2025年第1期26-46,共21页
Background The redirected walking(RDW)method for multi-user collaboration requires maintaining the relative position between users in a virtual environment(VE)and physical environment(PE).A chasing game in a VE is a t... Background The redirected walking(RDW)method for multi-user collaboration requires maintaining the relative position between users in a virtual environment(VE)and physical environment(PE).A chasing game in a VE is a typical virtual reality game that entails multi-user collaboration.When a user approaches and interacts with a target user in the VE,the user is expected to approach and interact with the target user in the corresponding PE as well.Existing methods of multi-user RDW mainly focus on obstacle avoidance,which does not account for the relative positional relationship between the users in both VE and PE.Methods To enhance the user experience and facilitate potential interaction,this paper presents a novel dynamic alignment algorithm for multi-user collaborative redirected walking(DA-RDW)in a shared PE where the target user and other users are moving.This algorithm adopts improved artificial potential fields,where the repulsive force is a function of the relative position and velocity of the user with respect to dynamic obstacles.For the best alignment,this algorithm sets the alignment-guidance force in several cases and then converts it into a constrained optimization problem to obtain the optimal direction.Moreover,this algorithm introduces a potential interaction object selection strategy for a dynamically uncertain environment to speed up the subsequent alignment.To balance obstacle avoidance and alignment,this algorithm uses the dynamic weightings of the virtual and physical distances between users and the target to determine the resultant force vector.Results The efficacy of the proposed method was evaluated using a series of simulations and live-user experiments.The experimental results demonstrate that our novel dynamic alignment method for multi-user collaborative redirected walking can reduce the distance error in both VE and PE to improve alignment with fewer collisions. 展开更多
关键词 Virtual reality Multi-user redirected walking User collisions Dynamic alignment
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Multi-User Cooperative Receive Scheme for Air-to-Ground Vortex Wave Communications 认领 引用
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作者 Zhang Beibei Chen Ruirui +3 位作者 Lin Jinyang Li Qi Liang Liping Sun Yanjing 《China Communications》 SCIE EI CSCD 2025年第3期76-85,共10页
Orbital angular momentum(OAM)can achieve multifold increase of spectrum efficiency,but the hollow divergence characteristic and Line-of-Sight(LoS)path requirement impose the crucial challenges for vortex wave communic... Orbital angular momentum(OAM)can achieve multifold increase of spectrum efficiency,but the hollow divergence characteristic and Line-of-Sight(LoS)path requirement impose the crucial challenges for vortex wave communications.For air-to-ground vortex wave communications,where there exists the LoS path,this paper proposes a multi-user cooperative receive(MUCR)scheme to break through the communication distance limitation caused by the characteristic of vortex wave hollow divergence.In particular,we derive the optimal radial position corresponding to the maximum intensity,which is used to adjust the waist radius.Based on the waist radius and energy ring,the cooperative ground users having the minimum angular square difference are selected.Also,the signal compensation scheme is proposed to decompose OAM signals in air-to-ground vortex wave communications.Simulation results are presented to verify the superiority of our proposed MUCR scheme. 展开更多
关键词 air-to-ground capacity cooperative receive multi-user vortex wave communications
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Cryptanalysis and Improvement of the Multi-User QPCE Protocol with Semi-Honest Third Party 认领 引用 被引量：2
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作者 昌燕 许春香 +5 位作者 张仕斌 王海春 闫丽丽 韩贵华 黄源源 盛志伟 《Chinese Physics Letters》 SCIE EI CAS CSCD 2016年第1期1-5,共5页
In a recent work [Quantum Inf. Process 12 （2013） 1077], a multi-user protocol of quantum private comparison of equality （QPCE） is presented. Here we point out that if we relax the constraint of a semi-honest third... In a recent work [Quantum Inf. Process 12 （2013） 1077], a multi-user protocol of quantum private comparison of equality （QPCE） is presented. Here we point out that if we relax the constraint of a semi-honest third party, the private information of the users will be totally leaked out to the third party. A special attack is demonstrated in detail. Furthermore, a possible improvement is proposed, which makes the protocol secure against this kind of attack. 展开更多
关键词 of in it or is on Cryptanalysis and Improvement of the Multi-User QPCE Protocol with Semi-Honest Third Party TP with
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Multi-User Detection for Spatial Modulation toward 5G Wireless Communications 认领 引用 被引量：2
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作者 Shiwen Fan, Yue Xiao +3 位作者 Xia Lei Rong Shi Ke Deng Shaoqian Li 《China Communications》 SCIE CSCD 2017年第12期100-110,共11页
Spatial modulation(SM) is a class of novel multiple-input multiple-output(MIMO) techniques toward future wireless communications,which activates only one transmit antenna in each time slot,so as to reduce the number o... Spatial modulation(SM) is a class of novel multiple-input multiple-output(MIMO) techniques toward future wireless communications,which activates only one transmit antenna in each time slot,so as to reduce the number of RF chains for saving the implement cost.Meanwhile,considering its application in 5G systems with multiple users,the detection of multi-user spatial modulation has drawn greater attention.In this paper,a pair of efficient detectors are proposed for multi-user spatial modulation.Specially,a threshold-aided approximate message passing(T-AMP) detector is proposed with the purpose of reducing the computational complexity of traditional structured approximate message passing(Str-AMP) detector.In addition,a novel probability sorting aided approximate message passing detector,called probability-ranking-aided AMP detector(P-AMP),is also proposed with the purpose of improving the performance.Simulation results show that the proposed T-AMP detector is able to achieve similar performance as traditional StrAMP with lower complexity,while the proposed P-AMP detector exhibits a better symbol error rate(SER) performance with similar complexity. 展开更多
关键词 multi-user spatial modulation probability sorting message passing.
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Closed BER expression of multi-user DS UWB systemsin indoor fading channel 认领 引用 被引量：3
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作者 樊祥宁 黄勇富 毕光国 《Journal of Southeast University(English Edition)》 EI CAS 2006年第1期16-20,共5页
The bit error rate （BER） performance of multi-user direct spreading bi-phase shift keying （DSBPSK） direct impulse ultra wideband （UWB） systems is analyzed and simulated based on a statistical indoor multi-path f... The bit error rate （BER） performance of multi-user direct spreading bi-phase shift keying （DSBPSK） direct impulse ultra wideband （UWB） systems is analyzed and simulated based on a statistical indoor multi-path fading channel model. The BER of the system is theoretically derived and given in closed form, which is expressed in terms of channel parameters and system parameters such as pulse width parameter, pulse repeat period, user number and pulse waveform. With this BER expression, the effect of these parameters on the system performance can be evaluated in a uniform way. Simulation results well match the theory numerical results, and prove that the multi-access interference （MAI） of DS-BPSK UWB is a normal distribution. 展开更多
关键词 ultra wideband （UWB） direct spreading （DS） bi-phase shift keying （BPSK） multi-user fading channel performance analysis
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Optimal subcarrier allocation for cognitive radio with multi-user OFDM and distributed antenna 认领 引用 被引量：2
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作者 葛文栋 纪红 +1 位作者 司鹏搏 李曦 《Journal of Southeast University(English Edition)》 EI CAS 2010年第4期513-517,共5页
The subcarrier allocation problem in cognitive radio（CR）networks with multi-user orthogonal frequency-division multiplexing（OFDM）and distributed antenna is analyzed and modeled for the flat fading channel and the ... The subcarrier allocation problem in cognitive radio（CR）networks with multi-user orthogonal frequency-division multiplexing（OFDM）and distributed antenna is analyzed and modeled for the flat fading channel and the frequency selective channel,where the constraint on the secondary user（SU）to protect the primary user（PU）is that the total throughput of each PU must be above the given threshold instead of the ＂interference temperature＂.According to the features of different types of channels,the optimal subcarrier allocation schemes are proposed to pursue efficiency（or maximal throughput）,using the branch and bound algorithm and the 0-1 implicit enumeration algorithm.Furthermore,considering the tradeoff between efficiency and fairness,the optimal subcarrier allocation schemes with fairness are proposed in different fading channels,using the pegging algorithm.Extensive simulation results illustrate the significant performance improvement of the proposed subcarrier allocation schemes compared with the existing ones in different scenarios. 展开更多
关键词 cognitive radio subcarrier allocation multi-user OFDM distributed antenna branch and bound algorithm implicit enumeration algorithm pegging algorithm
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Joint Channel and Multi-User Detection Empowered with Machine Learning 认领 引用 被引量：1
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作者 Mohammad Sh.Daoud Areej Fatima +6 位作者 Waseem Ahmad Khan Muhammad Adnan Khan Sagheer Abbas Baha Ihnaini Munir Ahmad Muhammad Sheraz Javeid Shabib Aftab 《Computers, Materials & Continua》 SCIE EI 2022年第1期109-121,共13页
The numbers of multimedia applications and their users increase with each passing day.Different multi-carrier systems have been developed along with varying techniques of space-time coding to address the demand of the... The numbers of multimedia applications and their users increase with each passing day.Different multi-carrier systems have been developed along with varying techniques of space-time coding to address the demand of the future generation of network systems.In this article,a fuzzy logic empowered adaptive backpropagation neural network(FLeABPNN)algorithm is proposed for joint channel and multi-user detection(CMD).FLeABPNN has two stages.The first stage estimates the channel parameters,and the second performsmulti-user detection.The proposed approach capitalizes on a neuro-fuzzy hybrid systemthat combines the competencies of both fuzzy logic and neural networks.This study analyzes the results of using FLeABPNN based on a multiple-input andmultiple-output(MIMO)receiver with conventional partial oppositemutant particle swarmoptimization(POMPSO),total-OMPSO(TOMPSO),fuzzy logic empowered POMPSO(FL-POMPSO),and FL-TOMPSO-based MIMO receivers.The FLeABPNN-based receiver renders better results than other techniques in terms of minimum mean square error,minimum mean channel error,and bit error rate. 展开更多
关键词 Channel and multi-user detection minimum mean square error multiple-input and multiple-output minimum mean channel error bit error rate
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Sparse array of sub-surface aided blockage-free multi-user mmWave communication systems 认领 引用 被引量：1
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作者 Weicong Chen Xi Yang +1 位作者 Shi Jin Pingping Xu 《Digital Communications and Networks》 SCIE EI 2020年第3期292-303,共12页
Recently,Reconfigurable Intelligent Surfaces(RISs)have drawn intensive attention in the realization of the smart radio environment.However,existing works mainly consider the RIS as a whole uniform plane,which may be u... Recently,Reconfigurable Intelligent Surfaces(RISs)have drawn intensive attention in the realization of the smart radio environment.However,existing works mainly consider the RIS as a whole uniform plane,which may be unrealistic to be installed on the facade of buildings when the RIS is extremely large.In contrast,this paper investigates a practical Sparse Array of Sub-surface(SAoS)deployment of the RIS for uplink multi-user millimeter Wave(mmWave)communication systems,in which the Mobile Stations(MSs)are distributed in the blind coverage area due to the blockage.In order to exploit the benefits of the sparse deployment,the correlation of the effective channel is firstly investigated.Then the approximation and lower bounds of the ergodic spectral efficiency are derived under frequency and spatial multiplexing scenarios,respectively.Based on the autocorrelation of the effective channel,we obtain an optimal reflect coefficient design as well as the deployment guidelines of RIS tiles.Moreover,the RIS tile scheduling algorithms are also proposed.Numerical results show that the ergodic spectral efficiency approximation matches well with the Monte Carlo result under frequency multiplexing scenarios,and the lower bound is tight under spatial multiplexing scenarios only when the effective channel is strongly correlated.On the basis of the RIS tile scheduling algorithm and the reflect coefficient design,the system performance can be significantly improved under frequency multiplexing scenarios.On the other hand,by deploying more sparse RIS tiles,we can increase the multiplexing gain under spatial multiplexing scenarios. 展开更多
关键词 Sparse array Reconfigurable intelligent surface Multi-user Blockage-free mmWave
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Joint Source and Relay Precoding/Beamforming Algorithm for OFDM Multi-user Cooperative Relay Systems 认领 引用 被引量：1
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作者 ZHOU Dong-yue HU Bin-jie 《Journal of Donghua University(English Edition)》 EI CAS 2014年第5期723-726,共4页
In order to reduce the feedback load of multi-user orthogonal frequency division multiplexing （ OFDM ） -based wireless systems, a practiral limited bits feedback precoding algorithm is proposed with direct source-de... In order to reduce the feedback load of multi-user orthogonal frequency division multiplexing （ OFDM ） -based wireless systems, a practiral limited bits feedback precoding algorithm is proposed with direct source-destination link based on amplify-and- forward cooperative relay network under frequency selective fading channels. Using joint minimum mean square error（MMSE） filter, the receiving decoding matrix is designed for each user in the paper. Source precoding （beamforming） matrix is optimized with convex function of weight mean square error （MSE）. Relay precoding matrix is obtained under MSE decomposition and convex optimization. The precoding matrix index is fed back for clustered subcarrier of OFDM with limited feedback. Then using interpolation algorithm, all precoding matrices are achieved at base station （BS） and relay nodes. Simulations indicate the effectiveness of the proposed limited feedback joint precoding and beam_formlng design. The proposed method can improve bit error rate （BER） performance and obtain better sum-rate performance in contrast to existing algorithms. It displays the BER performance is close to that of the unquantified precoding feedback method. 展开更多
关键词 relay multi-user precoding mean square error (MSE) feedback bits dual hop
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Wavelet Packet Domain LMS Based Multi-User Detection 认领 引用 被引量：1
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作者 刘鹏 安建平 《Journal of Beijing Institute of Technology》 EI CAS 2008年第4期484-488,共5页
An improved wavelet packet domain least mean square （IWPD-LMS） based adaptive muhiuser detection algorithm is proposed. The algorithm employs the wavelet packet transform to rewhiten the input data, and chooses the ... An improved wavelet packet domain least mean square （IWPD-LMS） based adaptive muhiuser detection algorithm is proposed. The algorithm employs the wavelet packet transform to rewhiten the input data, and chooses the best wavelet packet basis according to a novel convergence contribution function rather than the conventional Shannon entropy. The theoretic analyses show that the inadequacy of the eigenvalue spread of the tap-input correlation matrix is ameliorated, thus the convergence performance is improved greatly. The simulation result of convergence performance and bit error rate（BER） performance as a function of the signal power to noise power ratio（SNR） are presented finally to prove the validity of the proposed algorithm. 展开更多
关键词 multi-user detection least mean square （LMS） wavelet packet wavelet packet basis
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RLS and LMS blind adaptive multi-user detection method and comparison in acoustic communication 认领 引用 被引量：7
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作者 WANG Zhongqiu WANG Hongru MENG Qingming 《Instrumentation》 2015年第2期47-54,共8页
RLS and LMS blind adaptive multi-user detection algorithm and multi-user detector was proposed to solve the problem of multi-user signal detection problem encountered in underwater acoustic communication networks.In s... RLS and LMS blind adaptive multi-user detection algorithm and multi-user detector was proposed to solve the problem of multi-user signal detection problem encountered in underwater acoustic communication networks.In simulation analysis,RLS and the LMS blind adaptive multi-user detector were designed and tested for synchronous and asynchronous multi-user communication process.The results of SIR comparison and MMSE comparison show that,both of the two methods can realize blind adaptive detection when any user change in multi-user communication,during this process,the training communication sequences are not needed.The RLS algorithm has about 5 dB higher in SIR compared with LMS algorithm,and the convergence velocity of RLS algorithm is also higher than LMS algorithm when the communication users change.RLS algorithm has better ability in multi-user detection than that of LMS algorithm,and it has great attraction and guiding significance for solving the problem of multiple access interference(MAI) in multi-user communication. 展开更多
关键词 recursive least squares least mean square method multi-user detection blind adaptive acoustic communication
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Multi-user performance analysis of differential frequency hopping system over Rayleigh-fading channel 认领 引用 被引量：2
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作者 陈智 《High Technology Letters》 EI CAS 2008年第2期147-153,共7页
A novel non-coherent detection scheme for differential frequency hopping(DFH)system is proposedin asynchronous multi-user environments over Rayleigh-fading channels.The synchronous and asyn-chronous multi-user perform... A novel non-coherent detection scheme for differential frequency hopping(DFH)system is proposedin asynchronous multi-user environments over Rayleigh-fading channels.The synchronous and asyn-chronous multi-user performances of DFH with the conventional detection scheme and this novel detectionscheme are analyzed,respectively.The performance results are validated with simulation.The results ofanalyses and simulations prove two conclusions.Firstly,the performance of asynchronous multi-user DFHsystem overcomes that of synchronous multi-user DFH system over Rayleigh-fading channel.Secondly,the novel detection scheme can achieve better performance than the conventional non-coherent detectionscheme in asynchronous multi-user environments. 展开更多
关键词 differential frequency hopping（DFH） multi-user performance multi-access interfer-ence（MAI） Rayleigh-fading
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Joint multi-user space time block coding and beamforming via convolutional weighting 认领 引用 被引量：1
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作者 邢志强 Zhou Tingxian Meng Weixiao 《High Technology Letters》 EI CAS 2006年第2期119-123,共5页
A convolutional weighting （CW） scheme applied to a half-wavelength spacing array was proposed for multi-user system to joint STBC （space time block ceding） and beam forming （BF）. The transmitting beam is equival... A convolutional weighting （CW） scheme applied to a half-wavelength spacing array was proposed for multi-user system to joint STBC （space time block ceding） and beam forming （BF）. The transmitting beam is equivalent to the product of two sub-beams. One is used to realize interference suppression, while the other is employed to form a couple of uncorrelated channels from base station （BS） to the desited user （to meet the requirement of STBC） and to maximize SINR （signal-to-interference-plus noise ratio） at the desired receiver. As an optimum combination of STBC and beam forming, the proposed scheme can achieve both full diversity order of STBC and array gain of BF. Meanwhile, it can also effec- tively restrain multi-user interference by nulling. Simulation results show that the proposed scheme can significantly improve the BER （Bit Error Rate） performance and enhance system capacity as compared with the conventional eigen-beamforming （EBF） technique applied to a half-wavelength spacing array. 展开更多
关键词 space time block ceding beam forming convolutional weighting multi-user interference
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Dynamic multi-user detection scheme based on CVA-SSAOMP algorithm in uplink grant-free NOMA 认领 引用
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作者 Xu Lei Tao Shangjin +3 位作者 Bai Shichao Zhang Jian Fang Hongyu Li Xiaohui 《High Technology Letters》 EI CAS 2021年第1期10-16,共7页
In the uplink grant-free non-orthogonal multiple access(NOMA)scenario,since the active user at the sender has a structured sparsity transmission characteristic,the compressive sensing recovery algorithm is initially a... In the uplink grant-free non-orthogonal multiple access(NOMA)scenario,since the active user at the sender has a structured sparsity transmission characteristic,the compressive sensing recovery algorithm is initially applied to the joint detection of the active user and the transmitted data.However,the existing compressed sensing recovery algorithms with unknown sparsity often require noise power or signal-to-noise ratio(SNR)as the priori conditions,which greatly reduces the algorithm adaptability in multi-user detection.Therefore,an algorithm based on cross validation aided structured sparsity adaptive orthogonal matching pursuit(CVA-SSAOMP)is proposed to realize multi-user detection in dynamic change communication scenario of channel state information(CSI).The proposed algorithm transforms the structured sparsity model into a block sparse model,and without the priori conditions above,the cross validation method in the field of statistics and machine learning is used to adaptively estimate the sparsity of active user through the residual update of cross validation.The simulation results show that,compared with the traditional orthogonal matching pursuit(OMP)algorithm,subspace pursuit(SP)algorithm and cross validation aided block sparsity adaptive subspace pursuit(CVA-BSASP)algorithm,the proposed algorithm can effectively improve the accurate estimation of the sparsity of active user and the performance of system bit error ratio(BER),and has the advantage of low-complexity. 展开更多
关键词 non-orthogonal multiple access(NOMA) multi-user detection cross validation structured sparsity(SP) orthogonal matching pursuit(OMP)
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Adaptive resource allocation in downlink multi-user MC-CDMA systems 认领 引用
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作者 王俊波 陈明 王江舟 《Journal of Southeast University(English Edition)》 EI CAS 2008年第4期402-406,共5页
The joint channel and power allocation in the downlink transmission of multi-user multi-carrier code division multiple access（MC-CDMA） systems are investigated and the throughput maximization problem is considered a... The joint channel and power allocation in the downlink transmission of multi-user multi-carrier code division multiple access（MC-CDMA） systems are investigated and the throughput maximization problem is considered as a mixed integer optimization problem. For simplicity of analysis, the problem is divided into two less complex sub-problems： power allocation and channel allocation, which can be solved by a suboptimal adaptive power allocation （APA）algorithm and an optimal adaptive channel allocation （ACA） algorithm, respectively. By combining APA and ACA algorithms, an adaptive channel and power allocation scheme is proposed. The numerical results show that the proposed APA algorithm is more suitable for MC-CDMA systems than the conventional equal power allocation algorithm, and that the proposed channel and power allocation scheme can significantly improve the system throughout performance. 展开更多
关键词 code division multiple access （CDMA） multi-carriertransmission multi-user channel allocation power allocation
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Zero-forcing beamforming with receiver antenna selection in downlink multi-antenna multi-user system 认领 引用
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作者 Huang Senhua Qiu Ling Shi Lin 《Journal of Systems Engineering and Electronics》 SCIE EI 2008年第6期1258-1263,共6页
A study on the zero-forcing beamforming(ZFBF)scheme with antenna selection at user terminals in downlink multi-antenna multi-user systems is presented.Simulation results show that the proposed ZFBF scheme with receive... A study on the zero-forcing beamforming(ZFBF)scheme with antenna selection at user terminals in downlink multi-antenna multi-user systems is presented.Simulation results show that the proposed ZFBF scheme with receiver antenna selection(ZFBF-AS)achieves considerable throughput improvement over the ZFBF scheme with single receiver antenna.The results also show that,with multi-user diversity,the ZFBF-AS scheme approaches the throughput performance of the ZFBF scheme using all receiver antennas(ZFBF-WO-AS)when the base station adopts semi-orthogonal user selection(SUS)algorithm,and achieves larger throughput when the base station adopts the Round-robin scheduling algorithm.Compared with ZFBF-WO-AS,the proposed ZFBF-AS scheme can reduce the cost of user equipments and the channel state information requirement at the transmitter(CSIT)as well as the multiuser scheduling complexity at the transmitter. 展开更多
关键词 downlink multi-antenna multi-user system zero-forcing beamforming antenna selection throughput performance
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ROLS-AWS algorithm used in RBF neural network for multi-user detection 认领 引用
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作者 王永建 赵洪林 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2008年第4期553-557,共5页
To improve the computational speed, the ROLS-AWS algorithm was employed in the RBF based MUD receiver. The radial basis function was introduced into the multi-user detection （MUD） firstly. Then a three-layer neural ... To improve the computational speed, the ROLS-AWS algorithm was employed in the RBF based MUD receiver. The radial basis function was introduced into the multi-user detection （MUD） firstly. Then a three-layer neural network demodulation spread-spectrum signal model in the synchronous Gauss channel was given and the multi-user detection receiver was analyzed intensively. Simulations by computer illustrate that the proposed RBF based MUD receiver employing the ROKS-AWS algorithm is better than conventional detectors and common BP neural network based MUD receivers on suppressing multiple access interference and near-far resistance. 展开更多
关键词 multi-user detection （MUD） RBF neural network ROLS-AWS algorithm
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Multi-User Connection Performance Assessment of NOMA Schemes for Beyond 5G 认领 引用 被引量：4
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作者 Baoxi Wang Chunlin Yan +1 位作者 Wei Liu Hailin Zhang 《China Communications》 SCIE CSCD 2020年第12期206-216,共11页
Non-orthogonal multiple access(NOMA)is proved to be useful to satisfy the requirements of beyond 5th generation such as massive multi-user connection.Here we compare the performances of two NOMA schemes:low code rate ... Non-orthogonal multiple access(NOMA)is proved to be useful to satisfy the requirements of beyond 5th generation such as massive multi-user connection.Here we compare the performances of two NOMA schemes:low code rate spreading(LCRS)scheme and interleaver division multiple access(IDMA)scheme.It is found that LCRS is superior to IDMA when number of users is small due to coding gain achieved.While IDMA is preferred when number of users is high because repetition applied in IDMA can suppress multi-user interference effectively.And interleaver is important in IDMA for randomizing the interference.Also,this paper evaluates the impact of channel decoder.It is observed that Log-MAP decoder has much better performance than that of Max-Log-MAP when number of users is large.Thus,it is recommended to use Log-MAP decoder in NOMA in high user overloading case.We also compared the performance of NOMA by using different type of channel codes.We find that NOMA using specific convolutional code has a better performance than that of using specific LDPC code when number of users is high. 展开更多
关键词 NOMA multi-user connection LCRS IDMA iterative receiver channel coding
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Resource Allocation in Multi-User Cellular Networks:A Transformer-Based Deep Reinforcement Learning Approach 认领 引用 被引量：4
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作者 Zhao Di Zheng Zhong +2 位作者 Qin Pengfei Qin Hao Song Bin 《China Communications》 SCIE CSCD 2024年第5期77-96,共20页
To meet the communication services with diverse requirements,dynamic resource allocation has shown increasing importance.In this paper,we consider the multi-slot and multi-user resource allocation(MSMU-RA)in a downlin... To meet the communication services with diverse requirements,dynamic resource allocation has shown increasing importance.In this paper,we consider the multi-slot and multi-user resource allocation(MSMU-RA)in a downlink cellular scenario with the aim of maximizing system spectral efficiency while guaranteeing user fairness.We first model the MSMURA problem as a dual-sequence decision-making process,and then solve it by a novel Transformerbased deep reinforcement learning(TDRL)approach.Specifically,the proposed TDRL approach can be achieved based on two aspects:1)To adapt to the dynamic wireless environment,the proximal policy optimization(PPO)algorithm is used to optimize the multi-slot RA strategy.2)To avoid co-channel interference,the Transformer-based PPO algorithm is presented to obtain the optimal multi-user RA scheme by exploring the mapping between user sequence and resource sequence.Experimental results show that:i)the proposed approach outperforms both the traditional and DRL methods in spectral efficiency and user fairness,ii)the proposed algorithm is superior to DRL approaches in terms of convergence speed and generalization performance. 展开更多
关键词 dynamic resource allocation multi-user cellular network spectrum efficiency user fairness
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