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Comparison of Two Neural Networks in MC-CDMA Multiuser Detection
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作者 王勇 尤肖虎 +1 位作者 陈明 卜志勇 《Journal of Southeast University(English Edition)》 EI CAS 1999年第1期17-21,共5页
MC CDMA is a thriving topic in recent years. Multiuser interference is also very severe as in DS CDMA. ML method is the best multiuser detection, but it has a computational complexity exponentially increased with th... MC CDMA is a thriving topic in recent years. Multiuser interference is also very severe as in DS CDMA. ML method is the best multiuser detection, but it has a computational complexity exponentially increased with the number of users. Mean field annealing and chaotic neural network are two promising optimum techniques. This paper applies them into the ML detection, comparison of the two methods is made. 展开更多
关键词 multiuser detection MC CDMA ML chaotic neural network MFA
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NOVEL ADAPTIVE MULTIUSER DETECTIONALGORITHM BASED ON WAVELET TRANSFORM 被引量:1
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作者 ZHANGXiao-fei XUDa-zhuan YANGBei 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2004年第2期141-146,共6页
The wavelet transform-based adaptive multiuser detection algorithm is presented. The novel adaptive multiuser detection algorithm uses the wavelet transform for the preprocessing, and wavelet-transformed signal uses L... The wavelet transform-based adaptive multiuser detection algorithm is presented. The novel adaptive multiuser detection algorithm uses the wavelet transform for the preprocessing, and wavelet-transformed signal uses LMS algorithm to implement the adaptive multiuser detection. The algorithm makes use of wavelet transform to divide the wavelet space, which shows that the wavelet transform has a better decorrelation ability and leads to better convergence. White noise can be wiped off under the wavelet transform according to different characteristics of signal and white noise under the wavelet transform. Theoretical analyses and simulations demonstrate that the algorithm converges faster than the conventional adaptive multiuser detection algorithm, and has the better performance. Simulation results reveal that the algorithm convergence relates to the wavelet base, and show that the algorithm convergence gets better with the increasing of regularity for the same series of the wavelet base. Finally the algorithm shows that it can be easily implemented. 展开更多
关键词 multiuser detection wavelet transform multi-resolution analyses multi-access interference (MAI) adaptive multiuser detection
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ANALYSIS OF GROUP MULTIUSER DETECTION BASED ON COALITION GAME THEORY 被引量:1
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作者 Li Cuilian Yang Zhen 《Journal of Electronics(China)》 2009年第6期804-811,共8页
Coalition game theory is introduced to investigate the performance,fairness and stability of decorrelating group multiuser detection receiver,not only from the perspective of individual nodes,but also various coalitio... Coalition game theory is introduced to investigate the performance,fairness and stability of decorrelating group multiuser detection receiver,not only from the perspective of individual nodes,but also various coalitions and the whole system as well. Firstly,to derive how the system scale with coalition size,a stochastic model with transferable payoffs (stochastic TU-model) is provided. Secondly,to find the most preferred coalition structures from the view point of individual nodes,a model with Non-Transferable payoffs (NTU-model) is presented. Theoretical analysis and simulation results suggest that stochasticaly the grand coalition is payoff maximizing for the system as a whole,while individual nodes with good-conditioned channels may prefer local "win-win coalitions". 展开更多
关键词 Coalition game CORE multiuser detection RATIONALITY
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Low Complexity Multiuser Detection with Recursively Successive Zero-Forcing and SIC Based on Nullspace for Multiuser MIMO-OFDM System 被引量:3
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作者 Zhang Chengwen Wang Bin +1 位作者 Li Danli Tan Xuezhi 《China Communications》 SCIE CSCD 2015年第9期53-63,共11页
To improve the spectrum efficiency, this paper considers the multiuser detection with the MU-MIMO technology for multiuser MIMO-OFDM system uplink with the same subcarrier shared by multiple users. A low complexity mu... To improve the spectrum efficiency, this paper considers the multiuser detection with the MU-MIMO technology for multiuser MIMO-OFDM system uplink with the same subcarrier shared by multiple users. A low complexity multiuser detection algorithm with recursively successive zero-forcing and successive interference cancellation(RSZF-SIC) based on nullspace is proposed. The RSZF process based on the block diagonalization(BD) technique eliminates the co-channel interference(CCI) by a recursive method based on the nullspace orthogonal theorem. The SIC process detects the user signals respectively with the reasonable user detection sequence based on the results of the RSZF process. The computational complexity of the proposed algorithm is effectively reduced by reducing the total number of singular value decomposition(SVD) operations and the dimension of the SVD matrix in the recursive procedure. The performance of the proposed algorithm is improved in terms of bit error rate and sum capacity of the system, especially in the highSNR regime. 展开更多
关键词 MIMO-OFDM MU-MIMO multiuser detection co-channel interference cancellation block diagonalization successive interference cancellation
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Low Complexity Multiuser Detection Algorithm for Multi-Beam Satellite Systems
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作者 Yang Wang Danfeng Zhao Xi Liao 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2015年第5期105-109,共5页
The minimum mean square error-successive interference cancellation( MMSE-SIC) multiuser detection algorithm has high complexity and long processing latency. A multiuser detection algorithm is proposed for multi-beam s... The minimum mean square error-successive interference cancellation( MMSE-SIC) multiuser detection algorithm has high complexity and long processing latency. A multiuser detection algorithm is proposed for multi-beam satellite systems in order to decrease the complexity and latency. The spot beams are grouped base on the distance between them in the proposed algorithm. Some groups are detected in parallel after a crucial group-wise interference cancellation. Furthermore, the multi-stage structure is introduced to improve the performance. Simulation results show that the proposed algorithm can achieve better performance with less complexity compared with the existing group detection algorithm. Moreover,the proposed algorithm using one stage can reduce the complexity over the fast MMSE-SIC and existing group detection algorithm by 9% and20. 9%. The processing latency is reduced significantly compared with the MMSE-SIC. 展开更多
关键词 satellite COMMUNICATIONS MULTI-BEAM SATELLITES multiuser detection COMPLEXITY
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MULTIUSER DETECTION AND DIVERSITY RECEPTION FOR ASYNCHRONOUS CDMA MOBILE COMMUNICATION
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作者 Wang Yan Cheng Shixin (National Communication Research Lab, Southeast University, Nanjing 210096) 《Journal of Electronics(China)》 1999年第2期117-122,共6页
In CDMA mobile communication systems, multiple access interference can be canceled by multiuser detection technique. The Degradation by channel fading can be reduced by diversity reception. This paper investigates a f... In CDMA mobile communication systems, multiple access interference can be canceled by multiuser detection technique. The Degradation by channel fading can be reduced by diversity reception. This paper investigates a family of multiuser receivers that combined decor-relating detection, antenna diversity and RAKE multipath diversity. The performance of the multiuser receivers is analyzed. The results demonstrate a significant increase in the performance of the receivers by using multiuser detection and diversity reception. 展开更多
关键词 multiuser detection DIVERSITY RECEPTION ASYNCHRONOUS CDMA channel
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BLIND DIFFERENTIAL ADAPTIVE MULTIUSER DETECTION
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作者 潘且鲁 席裕庚 《Journal of Shanghai Jiaotong university(Science)》 EI 2000年第2期52-56,共5页
In this paper, a new blind equalization cost function, termed differential mean output energy (DMOE), was presented, and a new multiuser detection algorithm with variable step size was designed. It is shown through si... In this paper, a new blind equalization cost function, termed differential mean output energy (DMOE), was presented, and a new multiuser detection algorithm with variable step size was designed. It is shown through simulation results for a co channel system involving severe MAI that the DMOE algorithm gives significantly enhanced signal to interference ratio (SIR) performance and converges rapidly to the optimum MMSE detector, together with a low computational complexity requirement relative to the recursive least squares (RLS) algorithm. Thus, it is not necessary to switch to the decision directed mode. Moreover, it also exhibits global convergence, and can be used in different interference environment without the requirement of estimating and restricting the surplus energy. 展开更多
关键词 multiuser detection CDMA systems multi access INTERFERENCE BLIND EQUALIZATION INTERFERENCE CANCELLATION Document code:A
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PERFORMANCE OF MULTIUSER DETECTION FOR CDMA SYSTEM IN A FLAT RAYLEIGH FADING ENVIRONMENT
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作者 Nie Jingnan Cheng Shixin You Xiaohu(National Mobile Communications Research Lab, Southeast University, Nanjing 210096) 《Journal of Electronics(China)》 1997年第3期285-288,共4页
In a CDMA communication network using conventional signal detection, system capacity is limited and its performance is degraded by the multi-access interference (MAI). Multiuser detection, which makes use of cross-cor... In a CDMA communication network using conventional signal detection, system capacity is limited and its performance is degraded by the multi-access interference (MAI). Multiuser detection, which makes use of cross-correlation information between spread spectrum codes, can reduce or eliminate the MAI in a Gaussian channel so as to mitigate the near-far effects and increase the system capacity. This paper extends the multiuser detector to a flat Rayleigh fading CDMA environment, and discusses the bit error rate of typical multiuser detection algorithms in such a environment by combining theoretical analysis and computer simulation. It is shown that multiuser detection is superior to conventional detections in the flat Rayleigh fading channels. 展开更多
关键词 CDMA RAYLEIGH FADING multiuser detection
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Novel space-time multiuser detection algorithm of WCDMA system
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作者 ZhangXiaofei XuDazhuan YangBei 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2005年第1期42-46,共5页
The structure and performance of space-time multiuser detection receiver at base stations of WCDMA system is analyzed, in which smart antenna is employed. WCDMA uplink signal model is established in this paper. Space-... The structure and performance of space-time multiuser detection receiver at base stations of WCDMA system is analyzed, in which smart antenna is employed. WCDMA uplink signal model is established in this paper. Space-time multiuser receiver presented in this paper combines 2D-RAKE with parallel interference cancellation (PIC), and the improved parallel interference cancellation methods are given. A novel space-time multiuser detection scheme, 2DRAKE-GPPIC is proposed. This scheme employs smart antenna to suppress unexpected DOA (Direction Of Arrival) signal, uses RAKE receiver to combine different delays of expected signal, and utilizes grouped partial parallel interference cancellation (GPPIC) algorithm to suppress further the interference signal in the main lobe of array antennas. The simulation results reveal that the scheme of space-time multiuser detection presented in this paper has better performance for WCDMA system. 展开更多
关键词 WCDMA multiuser detection Multiple access interference Bite error rate Space-time processing.
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Iterative Multiuser Receiver Based on Decorrelating Decision-Feedback Detection
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作者 张爱萍 罗汉文 王好星 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2003年第1期86-91,共6页
Iterative multiuser receiver for joint multiuser detection and channel decoding improves the receiver' s performance by passing soft information between multiuser detection and channel decoding. In this paper, an ... Iterative multiuser receiver for joint multiuser detection and channel decoding improves the receiver' s performance by passing soft information between multiuser detection and channel decoding. In this paper, an iterative multiuser receiver based on decorrelating decision-feedback detection is proposed, which is effective to implement multiuser detection, channel decoding and parameter estimation. The data decoding and the parameter estimation are reinforced each other. The bit error rate decreases along with the increase of the iteration, and the parameter estimation approaches the optimum at the same time. 展开更多
关键词 multiuser detection Parameter estimation Turbo principle.
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Algorithm and application of multiuser detection for CDMA-based MANET
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作者 钱小聪 郑宝玉 +1 位作者 颜振亚 余根坚 《Journal of Shanghai University(English Edition)》 CAS 2007年第2期148-152,共5页
Throughput of mobile ad hoc network (MANET) is limited by collision avoidance. In CDMA-based MANET, this limitation can be overcome by multiuser detection (MUD) because conventional colliding packets can be detach... Throughput of mobile ad hoc network (MANET) is limited by collision avoidance. In CDMA-based MANET, this limitation can be overcome by multiuser detection (MUD) because conventional colliding packets can be detached and detected by MUD so that multi-packet reception (MPR) is possible. This paper introduces the principles of MUD algorithm for MANET, and proposes an adaptive blind MUD algorithm. A special medium access control (MAC) protocol is designed to make MANET more efficient. This is achieved by sending more packets to a destination simultaneously. The proposed MUD algorithm and MAC protocol allow CDMA-based MANET to support MPR. Simulations show a remarkable improvement in the throughput performance of MANET. 展开更多
关键词 ad hoc mobile ad hoc network (MANET) multiuser detection CDMA
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LOW-COMPLEXITY BLIND MULTIUSER DETECTION OF DS-CDMA SIGNAL IN DISPERSIVE CHANNELS
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作者 Lin Zhiqiang You Xiaohu Wang Yong(National Mobile Communications Research Laboratory, Southeast University, Nanjing 210096) 《Journal of Electronics(China)》 2001年第4期330-336,共7页
The problem of blind multiuser detection in dispersive channels of Code-Division Multiple-Access (CDMA) in the presence of both Multiple-Access Interference (MAI) and InterSymbol Interference (ISI) is considered. In p... The problem of blind multiuser detection in dispersive channels of Code-Division Multiple-Access (CDMA) in the presence of both Multiple-Access Interference (MAI) and InterSymbol Interference (ISI) is considered. In practice, it is showed that by incorporating the desired user's signature waveform and the auxiliary vector, the information of the user can be identified using the suboptimal subspace method. The major contribution of this paper is to propose a minimum-mean-square-error detector with the suboptimal subspace-based blind technique for joint suppression of MAI and ISI in the dispersive CDMA channels. 展开更多
关键词 CODE-DIVISION MULTIPLE-ACCESS multiuser detection MULTIPLE-ACCESS INTERFERENCE Intersymbol INTERFERENCE
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Space-Time Multiuser Detection for DS-CDMA Communication in MIMO Systems
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作者 单红梅 胡光锐 《Journal of Shanghai University(English Edition)》 CAS 2005年第4期344-348,共5页
Space-time signal processing based on multiple-input multiple-output(MIMO) systems is an active research field in which interfering signals are cancelled and multiuser detection is achieved using space diversity. In... Space-time signal processing based on multiple-input multiple-output(MIMO) systems is an active research field in which interfering signals are cancelled and multiuser detection is achieved using space diversity. In a Rayleigh fading channel, space-time block cedes using multiple transmitting antennas can improve system performance and reduce bit-error-rate for multiuser detection. In this paper, several antenna configurations are designed for DS-CDMA communication in MIMO systems. Space-time linear multinser detection and space-time serial interference cancellation multiuser detection are simulated. Bit-error-rate and computation complexities of the two methods are compared. Conclusions are given in the end. 展开更多
关键词 DS-CDMA multiple-input multiple-output(MIMO) space-time block codes space-time multiuser detection.
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FIXED-POINT BLIND ADAPTIVE MULTIUSER DETECTION ALGORITHM FOR IR UWB SYSTEMS IN MULTIPATH CHANNEL
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作者 Wang Feng Xu Chengqi 《Journal of Electronics(China)》 2010年第2期157-165,共9页
Using the hypothesis that data transmitted by different users are statistically independent of each other,this paper proposes a fixed-point blind adaptive multiuser detection algorithm for Time-Hopping (TH) Impulse Ra... Using the hypothesis that data transmitted by different users are statistically independent of each other,this paper proposes a fixed-point blind adaptive multiuser detection algorithm for Time-Hopping (TH) Impulse Radio (IR) Ultra Wide Band (UWB) systems in multipath channel,which is based on Independent Component Analysis (ICA) idea. The proposed algorithm employs maximizing negentropy criterion to separate the data packets of different users. Then the user characteristic se-quences are utilized to identify the data packet order of the desired user. This algorithm only needs the desired user’s characteristic sequence instead of channel information,power information and time-hoping code of any user. Due to using hypothesis of statistical independence among users,the proposed algorithm has the outstanding Bit Error Rate (BER) performance and the excellent ability of near-far resistance. Simulation results demonstrate that this algorithm has the performance close to that of Maximum-Likelihood (ML) algorithm and is a suboptimum blind adaptive multiuser detection algorithm of excellent near-far resistance and low complexity. 展开更多
关键词 Ultra Wide Band (UWB) multiuser detection (MUD) Bind adaptive FIXED-POINT Multipath channel
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A novel constant modulus array for multiuser detection
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作者 张继东 郑宝玉 傅洪亮 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2005年第1期38-42,共5页
This paper proposes a new multitarget constant modulus array structure for code division multiple access (CDMA) systems. The new algorithm for the structure is called pre-despreading and wavelet denoising constant mod... This paper proposes a new multitarget constant modulus array structure for code division multiple access (CDMA) systems. The new algorithm for the structure is called pre-despreading and wavelet denoising constant modulus algorithm (D-WD-CMA). In the new algorithm, the pre-despreading is applied to multitarget arrays to remove some multiple access inter- ferences. After that the received signal is subjected to wavelet de-noising to reduce some noise, and used in CMA adaptive iteration for signal separation. Simulation results showed that the proposed algorithm performed better than the traditional CMA algorithm. 展开更多
关键词 Constant modulus algorithm Adaptive array Wavelet de-noising multiuser detection CDMA
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One-User/One-Group Soft-Decision Aided Multiuser Detection for 2D Spread MC DS-CDMAs
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作者 Hoang-Yang Lu I-Hsuan Lai 《Communications and Network》 2013年第3期119-126,共8页
We consider the uplink of a multiuser, multiple-input multiple-output (MIMO), frequency-time-domain spread, multi- carrier (MC), direct sequence code division multiple access (DS-CDMA) system. As other CDMA-like syste... We consider the uplink of a multiuser, multiple-input multiple-output (MIMO), frequency-time-domain spread, multi- carrier (MC), direct sequence code division multiple access (DS-CDMA) system. As other CDMA-like systems, the multiple access interference (MAI) effect still exists in such an MC DS-CDMA system. To mitigate the MAI effect, we propose user-based and group-based layered detection schemes. Specifically, to enable a trade-off between the performance and the computational complexity, the schemes only use one user's/group's soft decisions for user-based/ group-based layered detection. The results of simulations demonstrate that the proposed schemes outperform existing approaches, and their computational complexity is modest. 展开更多
关键词 multiuser detection MC DS-CDMA VBLAST MIMO
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The Behaviour of Vertical Bell Laboratories Layered Space-Time Algorithm Combined with Multiuser Detection Schemes in Wireless Communication System
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作者 Ayodeji James Bamisaye Olugbenga Kayode Ogidan Babatope Osalope 《Communications and Network》 2011年第2期51-56,共6页
This paper provides the performance analysis of multiuser Vertical Bell Laboratories Layered Space-Time (V-BLAST) system receiver structures for Multiple-input Multiple-Output (MIMO) channel at a base station with ass... This paper provides the performance analysis of multiuser Vertical Bell Laboratories Layered Space-Time (V-BLAST) system receiver structures for Multiple-input Multiple-Output (MIMO) channel at a base station with assumption of perfect channel estimation and perfect timing delay estimation. In MIMO channels the receivers such as decorrelator, Minimum Mean Square Error (MMSE) and Multistage Parallel Interference Cancellation (MPIC) receiver outperform the conventional receiver. Withal, since the multiple antenna interference led to a strong impact on the performance degradation of a multistage interference cancellation receiver, the performance of MPIC receiver was highly degraded based on system loading. 展开更多
关键词 Cdma MULTIPLE-INPUT Multiple-Output (Mimo) Channel multiuser detection VERTICAL BELL LABORATORIES Layered Space-Time (V-Blast)
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NOVEL DECODING OF SQUARE QAM MODULATED MIMO SYSTEMS BASED ON TURBO MULTIUSER DETECTION
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作者 Zheng Jianping Bai Baoming Wang Xinmei 《Journal of Electronics(China)》 2008年第2期174-178,共5页
By introducing the bit-level multi-stream coded Layered Space-Time (LST) transmitter along with a novel iterative MultiStage Decoding (MSD) at the receiver, the paper shows how to achieve the near-capacity perform... By introducing the bit-level multi-stream coded Layered Space-Time (LST) transmitter along with a novel iterative MultiStage Decoding (MSD) at the receiver, the paper shows how to achieve the near-capacity performance of the Multiple-Input Multiple-Output (MIMO) systems with square Quadrature Amplitude Modulation (QAM). In the proposed iterative MSD scheme, the detection at each stage is equivalent to multiuser detection of synchronous Code Division Multiple Access (CDMA) multiuser systems with the aid of the binary representation of the transmitted symbols. Therefore, the optimal Soft-Input Soft-Output (SISO) multiuser detection and low-complexity SISO multiuser detection can be utilized herein. And the proposed scheme with low-complexity SISO multiuser detection has polynomial complexity in the number of transmit antennas M, the number of receive antennas N, and the number of bits per constellation point Me. Simulation results demonstrate that the proposed scheme has similar Bit Error Rate (BER) performance to that of the known Iterative Tree Search (ITS) detection. 展开更多
关键词 Multiple-Input Multiple-Output (MIMO) MultiStage Decoding (MSD) Iterative detection/decoding multiuser detection Polynomial complexity
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A new support vector machine based multiuser detection scheme
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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5期620-623,共4页
In order to suppress the multiple access interference (MAI) in 3G, which limits the capacity of a CDMA communication system, a fast relevance vector machine (FRVM) is employed in the multiuser detection (MUD) scheme. ... In order to suppress the multiple access interference (MAI) in 3G, which limits the capacity of a CDMA communication system, a fast relevance vector machine (FRVM) is employed in the multiuser detection (MUD) scheme. This method aims to overcome the shortcomings of many ordinary support vector machine (SVM) based MUD schemes, such as the long training time and the inaccuracy of the decision data, and enhance the performance of a CDMA communication system. Computer simulation results demonstrate that the proposed FRVM based multiuser detection has lower bit error rate, costs short training time, needs fewer kernel functions and possesses better near-far resistance. 展开更多
关键词 multiuser detection support vector machine relevance vector machine bit error rate
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Soft-PIC multiuser detection in MC-CDMA uplink system
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作者 Guo Li-li Yuan Bing-bing 《Journal of Marine Science and Application》 2005年第2期65-69,共5页
It is necessary for an MC-CDMA uplink receiver to employ MUD (multiuser detection) in a frequency selective fading channel. After analyzing the algorithm of PIC(parallel interference cancellation) MUD, a novel MUD sch... It is necessary for an MC-CDMA uplink receiver to employ MUD (multiuser detection) in a frequency selective fading channel. After analyzing the algorithm of PIC(parallel interference cancellation) MUD, a novel MUD scheme, Soft-PIC (soft parallel interference cancellation) is proposed. Based on the reliability of each detected user signal in the former stage, this Soft-PIC detection scheme substitutes a soft decision of the variable for the hard decision in PIC scheme. Compared with the PIC scheme, it can reconstruct the interference signals more accurately and eliminate MAI(multiple access interference) in a more efficient way.PIC is one of the most practical schemes in numerous multiuser detection technologies. However, Soft-PIC as an improved PIC scheme deserves further study. 展开更多
关键词 muhi-carrier code division muhiple access multiuser detection soft parallel interference cancellation
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