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应用H_∞-范数进行多通道气动伺服弹性系统的频域稳定性分析 被引量:1
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作者 谷迎松 杨智春 +1 位作者 李斌 王巍 《西北工业大学学报》 EI CAS CSCD 北大核心 2012年第2期165-168,共4页
气动伺服弹性稳定性分析是现代飞机设计中必须考虑的课题。给出了多输入/多输出气动伺服弹性系统的频域运动方程,并由系统稳定性理论得出,在气动伺服弹性稳定临界点附近,系统的H∞-范数趋于无穷大。据此,发展了一种应用H∞-范数进行频... 气动伺服弹性稳定性分析是现代飞机设计中必须考虑的课题。给出了多输入/多输出气动伺服弹性系统的频域运动方程,并由系统稳定性理论得出,在气动伺服弹性稳定临界点附近,系统的H∞-范数趋于无穷大。据此,发展了一种应用H∞-范数进行频域气动伺服弹性稳定性分析的方法。针对某型飞机及其偏航/滚转增稳回路构成的多输入/多输出气动伺服弹性系统,采用该方法求得其闭环稳定临界点,与p-k法计算结果符合较好。分析结果还表明:考虑增稳系统的影响后,飞机气动伺服弹性稳定边界,相对于无控飞机的颤振速度有所降低;对临界稳定模态进行限幅滤波后,减小了不利耦合,使气动伺服弹性稳定性得到提高。 展开更多
关键词 气动伺服弹性 频域分析 限幅滤波器 H∞-范数 多输入/多输出系统
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Low complexity iterative differential decoding algorithm for multiband UWB communication systems
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作者 金秀峰 毕光国 肖海勇 《Journal of Southeast University(English Edition)》 EI CAS 2007年第1期7-11,共5页
Due to not requiring channel state information (CSI) at both the transmitter and the receiver, noncoherent ultra-wideband (UWB) incurs a performance penalty of approximately 3 dB in the required signal to noise ra... Due to not requiring channel state information (CSI) at both the transmitter and the receiver, noncoherent ultra-wideband (UWB) incurs a performance penalty of approximately 3 dB in the required signal to noise ratio (SNR) compared to the coherent case. To overcome the gap, an effective differential encoding and decoding scheme for multiband UWB systems is proposed. The proposed scheme employs the parallel concatenation of two recursive differential unitary space-frequency encoders at the transmitter. At the receiver, two component decoders iteratively decode information bits by interchanging soft metric values between each other. To reduce the computation complexity, a decoding algorithm which only uses transition probability to calculate the log likelihood ratios (LLRs) for the decoded bits is given. Simulation results show that the proposed scheme can dramatically outperform the conventional differential and even coherent detection at high SNR with a few iterations. 展开更多
关键词 multiband UWB multiple-input multiple-output (MIMO) system noncoherent detection group code iterative decoding
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Downlink cooperative beamforming for MIMO cellular systems
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作者 张源 《Journal of Southeast University(English Edition)》 EI CAS 2010年第3期379-383,共5页
In downlink cellular multiple users in multiple cells systems using beams, the should cooperate to generate beams to improve the spectrum efficiency. A mathematical model for the multi-cell multi-user downlink transm... In downlink cellular multiple users in multiple cells systems using beams, the should cooperate to generate beams to improve the spectrum efficiency. A mathematical model for the multi-cell multi-user downlink transmission is established, and the gradients of the variables including beamfonning filters, receiving filters and transmitting power are calculated. Then, a gradient-project-based cooperative beamforming scheme is proposed in which each user iteratively adjusts bearnforming variables in the direction of the gradients and projects onto feasible spaces. The information exchange protocol needed to support the scheme is also described. Simulation results show that the proposed scheme can achieve an average spectral efficiency of about 5 bit/( s · Hz · cell). The results show that cooperative beamforming can improve the spectrum efficiency of the cellular systems. 展开更多
关键词 cellular system mutiple-input mutiple-output (MIMO) cooperative beamforming spectral efficiency
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Modeling of Isomerization of C_8 Aromatics by Online Least Squares Support Vector Machine 被引量:7
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作者 李丽娟 苏宏业 褚建 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2009年第3期437-444,共8页
The least squares support vector regression (LS-SVR) is usually used for the modeling of single output system, but it is not well suitable for the actual multi-input-multi-output system. The paper aims at the modeling... The least squares support vector regression (LS-SVR) is usually used for the modeling of single output system, but it is not well suitable for the actual multi-input-multi-output system. The paper aims at the modeling of multi-output systems by LS-SVR. The multi-output LS-SVR is derived in detail. To avoid the inversion of large matrix, the recursive algorithm of the parameters is given, which makes the online algorithm of LS-SVR practical. Since the computing time increases with the number of training samples, the sparseness is studied based on the pro-jection of online LS-SVR. The residual of projection less than a threshold is omitted, so that a lot of samples are kept out of the training set and the sparseness is obtained. The standard LS-SVR, nonsparse online LS-SVR and sparse online LS-SVR with different threshold are used for modeling the isomerization of C8 aromatics. The root-mean-square-error (RMSE), number of support vectors and running time of three algorithms are compared and the result indicates that the performance of sparse online LS-SVR is more favorable. 展开更多
关键词 least squares support vector machine multi-variable ONLINE SPARSENESS ISOMERIZATION
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BROADCAST SCHEDULING WITH MIMO LINKS IN MULTI-HOP AD HOC NETWORKS 被引量:3
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作者 Zhang Guanghui Li Jiandong Zhao Min Li Changle 《Journal of Electronics(China)》 2007年第4期477-483,共7页
As the current medium access control protocols with Multiple Input Multiple Output (MIMO) links only bear point to point service, broadcast scheduling algorithm in ad hoc networks with MIMO links is proposed. The ke... As the current medium access control protocols with Multiple Input Multiple Output (MIMO) links only bear point to point service, broadcast scheduling algorithm in ad hoc networks with MIMO links is proposed. The key to the proposed broadcast scheduling algorithm is the time slot scheduling algorithm which guarantees collisi~)n-free transmissions for every node and the mini- mum frame length. The proposed algorithm increases the simultaneous transmissions of MIMO links efficiently. Due to the interference null capacity of MIMO links, the interference node set of each node can decrease from two-hop neighbors to one-hop neighbors possibly. Simulation results show that our algorithm can greatly improve network capacity and decrease average packet delay. 展开更多
关键词 Multiple Input Multiple Output (MIMO) Time Division Multiple Access (TDMA) BROADCAST Multihop ad hoc network
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ESTIMATION OF CARRIER FREQUENCY OFFSETS FOR MIMO SYSTEMS WITH DISTRIBUTED TRANSMIT ANTENNAS 被引量:2
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作者 Deng Kai Tang Youxi Lei Xia Li Shaoqian 《Journal of Electronics(China)》 2007年第4期455-461,共7页
The problem of estimating the carrier frequency offsets in Multiple-Input Multiple-Output (MIMO) systems with distributed transmit antennas is addressed. It is supposed that the transmit antennas are distributed while... The problem of estimating the carrier frequency offsets in Multiple-Input Multiple-Output (MIMO) systems with distributed transmit antennas is addressed. It is supposed that the transmit antennas are distributed while the receive antennas are still centralized, and the general case where both the time delays and the frequency offsets are possibly different for each transmit antenna is considered. The channel is supposed to be frequency flat, and the macroscopic fading is also taken into consideration. A carrier frequency offset estimator based on Maximum Likelihood (ML) is proposed, which can separately estimate the frequency offset for each transmit antenna and exploit the spatial diversity. The Cramer-Rao Bound (CRB) for synchronous MIMO (i.e., the time delays for each transmit antenna are all equal) is also derived. Simulation results are given to illustrate the per- formance of the estimator and compare it with the CRB. It is shown that the estimator can provide satisfactory frequency offset estimates and its performance is close to the CRB for the Signal-to-Noise Ratio (SNR) below 20dB. 展开更多
关键词 Multiple-Input Multiple-Output (MIMO) Distributed antenna Carrier frequency offset estimation Maximum Likelihood (ML) Cramer-Rao Bound (CRB)
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LINEAR-DISPERSION DIVISION MULTIPLE-ACCESS FOR MIMO SYSTEMS 被引量:1
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作者 Deng Dan Lv Xingzai Zhu Jinkang 《Journal of Electronics(China)》 2008年第4期433-438,共6页
Comprehensive study on novel Linear-Dispersion Division Multiple-Access(LDDMA) for multi-user uplink Multiple-Input Multiple-Output(MIMO)systems is proposed.In the new multi-plexing scheme,each user’s information sym... Comprehensive study on novel Linear-Dispersion Division Multiple-Access(LDDMA) for multi-user uplink Multiple-Input Multiple-Output(MIMO)systems is proposed.In the new multi-plexing scheme,each user’s information symbol is dispersed by a User-Specific Matrix(USM)both inspace and time domain and linearly combined at base-station side.And a simple random search al-gorithm,based on capacity maximization criteria,is developed to generate a bank of USMs.Simulationresults are presented to demonstrate the advantages of LDDMA.When the Bit Error Rate(BER)reaches 10–3,the performance gains are 3dB and 5dB,compared with Time-Division Linear DispersionCodes(TD-LDC)and BLAST,respectively. 展开更多
关键词 Multiple-Input Multiple-Output (MIMO) MULTIPLE-ACCESS Space-time codes Linear-dispersion codes
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AN IMPROVED AND EFFICIENT DETECTION SCHEME FOR V-BLAST SYSTEMS WITH QAM MODULATION 被引量:1
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作者 Lin Huajiong Tang Youxi Shao Shihai 《Journal of Electronics(China)》 2008年第5期588-594,共7页
The paper proposed an improved Ordered Successive Interference Cancellation(OSIC) detection scheme for V-BLAST systems with square/rectangular Quadrature Amplitude Modulation(QAM) modulation.It utilizes an equivalent ... The paper proposed an improved Ordered Successive Interference Cancellation(OSIC) detection scheme for V-BLAST systems with square/rectangular Quadrature Amplitude Modulation(QAM) modulation.It utilizes an equivalent real-valued vector expression of relationship between transmit signals and received signals,exploits the constellation's product-form structure and can eventually make the order,in which components of the transmit signals vector are extracted,more "optimal" in some sense.Thereby,it can offer an improved error probability as compared to the conventional OSIC detection scheme.In addition,the paper also proposes an efficient projection al-gorithm to calculate nulling vectors in a simple recursive fashion in order to avoid the vast increase of complexity,which is due to the fact that the original complex N -dimensional data vector and M×N channel matrix are transformed into a real 2N -dimensional data vector and a real 2M ×2N channel matrix respectively.A scrutinous complexity analysis shows that the complexity increases by only 33% as compared to the conventional scheme. 展开更多
关键词 Multiple-Input Multiple-Output (MIMO) Ordered Successive Interference Cancellation (OSIC) Quadrature Amplitude Modulation (QAM) Vertical Bell Labs Architecture of Layered Space-Time (V-BLAST)
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PERFORMANCE OF THE ZERO FORCING PRECODING MIMO BROADCAST SYSTEMS WITH CHANNEL ESTIMATION ERRORS 被引量:1
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作者 Wang Jing Liu Zhanli Wang Yan You Xiaohu 《Journal of Electronics(China)》 2007年第4期490-495,共6页
In this paper, the effect of channel estimation errors upon the Zero Forcing (ZF) precoding Multiple Input Multiple Output Broadcast (MIMO BC) systems was studied. Based on the two kinds of Gaussian estimation error m... In this paper, the effect of channel estimation errors upon the Zero Forcing (ZF) precoding Multiple Input Multiple Output Broadcast (MIMO BC) systems was studied. Based on the two kinds of Gaussian estimation error models, the performance analysis is conducted under different power allocation strategies. Analysis and simulation show that if the covariance of channel estimation errors is independent of the received Signal to Noise Ratio (SNR), imperfect channel knowledge deteriorates the sum capacity and the Bit Error Rate (BER) performance severely. However, under the situation of orthogonal training and the Minimum Mean Square Error (MMSE) channel estimation, the sum ca- pacity and BER performance are consistent with those of the perfect Channel State Information (CSI) with only a performance degradation. 展开更多
关键词 Zero Forcing (ZF) Multiple Input Multiple Output BroadCast (MIMO BC) system Channel estimation errors Sum capacity
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Nonlinear model predictive control based on support vector machine and genetic algorithm 被引量:5
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作者 冯凯 卢建刚 陈金水 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2015年第12期2048-2052,共5页
This paper presents a nonlinear model predictive control(NMPC) approach based on support vector machine(SVM) and genetic algorithm(GA) for multiple-input multiple-output(MIMO) nonlinear systems.Individual SVM is used ... This paper presents a nonlinear model predictive control(NMPC) approach based on support vector machine(SVM) and genetic algorithm(GA) for multiple-input multiple-output(MIMO) nonlinear systems.Individual SVM is used to approximate each output of the controlled plant Then the model is used in MPC control scheme to predict the outputs of the controlled plant.The optimal control sequence is calculated using GA with elite preserve strategy.Simulation results of a typical MIMO nonlinear system show that this method has a good ability of set points tracking and disturbance rejection. 展开更多
关键词 Support vector machine Genetic algorithm Nonlinear model predictive control Neural network Modeling
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Design and implementation of space-time precoded systems with full diversity and lossless capacity
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作者 郑武 张海滨 +2 位作者 何晓炜 刘陈 宋文涛 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2008年第6期846-850,共5页
A new space-time(ST)code design is proposed based on the design criteria of space-time codes,which is applied to the MIMO systems with fewer receive antennas than transmit antennas.The space-time codes,referred to as ... A new space-time(ST)code design is proposed based on the design criteria of space-time codes,which is applied to the MIMO systems with fewer receive antennas than transmit antennas.The space-time codes,referred to as full diversity lossless capacity(FDLLC)ST code,achieve full transmit diversity and lossless equivalent channel capacity for ST precoded systems.Combined FDLLC-ST codes with channel codes,ST bit interleaved coded modulation(ST-BICM)system is constructed and an iterative detector/decoder is employed at the receiver.Simulations are presented.It is proved that the proposed design has good performance compared with other ST precoded MIMO systems. 展开更多
关键词 MIMO systems space-time codes turbo codes iterative decoder
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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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Channel estimation for MIMO-OFDM systems in mobile wireless channels
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作者 吴赟 罗汉文 宋文涛 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2008年第6期841-845,共5页
A channel estimation method is proposed for nmltiple-input multiple-output orthogonal frequency division muhiplexing (MIMO-OFDM) systems in time-varying fading channels. In this method, a decision-directed space-alt... A channel estimation method is proposed for nmltiple-input multiple-output orthogonal frequency division muhiplexing (MIMO-OFDM) systems in time-varying fading channels. In this method, a decision-directed space-alternating generalized expectation-maximization (SAGE) algorithm is introduced to the tracking of time-varying fading. In order to improve the estimation performance of the SAGE algorithm, a low rank approximation method is presented by using the signal subspace of the channel frequency autocorrelation matrix. The study reveals that this method can be incorporated into the SAGE algorithm. Furthermore, a modified fast sub- space tracking algorithm is given to adaptively estimate the signal subspace by utilizing training OFDM blocks sent at regular interval. Simulation results demonstrate the considerable benefits of the proposed channel estimation method. 展开更多
关键词 MIMO-OFDM channel estimation SAGE subspace tracking
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POWER ALLOCATION AND ADAPTIVE MODULATION STRATEGY FOR MIMO-OFDM SYSTEMS WITH IMPERFECT CSI
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作者 Liu Yi Zhang Hailin 《Journal of Electronics(China)》 2007年第4期443-447,共5页
The presented scheme named M-CAP (Maximum CAPacity) uses the CSI (Channel State Information) and its statistics to deduce an equivalent channel according to which the transmit power is allocated to the subchannels. An... The presented scheme named M-CAP (Maximum CAPacity) uses the CSI (Channel State Information) and its statistics to deduce an equivalent channel according to which the transmit power is allocated to the subchannels. And then modulation scheme is determined adaptively according to the power allocated to each subchannel. The advantage of the M-CAP scheme is that it combines power allocation and adaptive modulation while maintaining a large capacity. We demonstrate by computer simulations that the proposed M-CAP scheme can significantly improve system performance compared with the traditional schemes. 展开更多
关键词 Power allocation Adaptive modulation Multi-Input Multi-Output (MIMO) Orthogonal Frequency Division Multiplexing (OFDM) Singular Value Decomposition (SVD) Channel State Information (CSI)
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AN ITERATIVE PARTICLE FILTER SIGNAL DETECTOR FOR MIMO FAST FADING CHANNELS
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作者 Yang Tao Hu Bo 《Journal of Electronics(China)》 2008年第2期157-165,共9页
For flat fast fading Multiple-Input Multiple-Output(MIMO) channels,this paper presents a sampling based channel estimation and an iterative Particle Filter(PF) signal detection scheme. The channel estimation is compri... For flat fast fading Multiple-Input Multiple-Output(MIMO) channels,this paper presents a sampling based channel estimation and an iterative Particle Filter(PF) signal detection scheme. The channel estimation is comprised of two parts:the adaptive iterative update on the channel distribution mean and a regular update on the "adaptability" via pilot. In the detection procedure,the PF is employed to produce the optimal decision given the known received signal and the sequence of the channel samples,where an asymptotic optimal importance density is constructed,and in terms of the asymptotic update order,the Parallel Importance Update(PIU) and the Serial Importance Update(SIU) scheme are performed respectively. The simulation results show that for the given fading channel,if an appropriate pilot mode is selected,the proposed scheme is more robust than the conventional Kalman filter based superimposed detection scheme. 展开更多
关键词 Multiple-Input Multiple-Output Update (PIU) Serial Importance Update (SIU) (MIMO) Particle Filter (PF) Parallel Importance
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Blind Channel Equalization Algorithm Based on Dual Unscented Kalman Filter for Chaotic Multi-Input Multi-Output Communication Systems 被引量:2
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作者 Hu Zhihui FENG Jiuchao 《Transactions of Tianjin University》 EI CAS 2012年第1期33-37,共5页
To reduce channel noise,fading,and inter-user interference effectively in the chaotic communication systems with multi-user,a blind channel equalization algorithm based on dual unscented Kalman filter algorithm is pro... To reduce channel noise,fading,and inter-user interference effectively in the chaotic communication systems with multi-user,a blind channel equalization algorithm based on dual unscented Kalman filter algorithm is proposed.Assuming that the coefficients of a multi-input multi-output (MIMO) channel can be described by an autoregressive model,two separate state-space representations are used for the signals and coefficients.Then two unscented Kalman filters are used to estimate chaotic signals and channel coefficients simultaneously.The simulation results indicate that the algorithm can effectively track the coefficients of the multi-path fading channel in chaotic MIMO communication systems at a fast convergence speed. 展开更多
关键词 chaotic MIMO system blind channel equalization unscented Kalman filter
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A rigorous proof of MIMO channel capacity's increase with antenna number
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作者 GONG Jian-min M. R. Soleymani J. F. Hayes 《Optoelectronics Letters》 EI 2008年第4期280-282,共3页
It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output(MIMO) communication systems.In this letter,a simple proof is pre... It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output(MIMO) communication systems.In this letter,a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas.The proof is based on the famous capacity formula of Foschini and Gans with matrix theory. 展开更多
关键词 ANTENNAS Communication systems Matrix algebra MIM devices MULTIPLEXING Receiving antennas
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ROBUST OPTIMIZATION OF TRANSMIT/RECEIVE BEAMFORMER FOR MIMO DOWNLINK WITH IMPERFECT CSI AT BASE STATION
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作者 Li Hao Xu Changqing 《Journal of Electronics(China)》 2008年第5期601-606,共6页
A robust scheme is proposed to jointly optimize transmit/receive beamformers for Mul-tiple Input Multiple Output(MIMO) downlinks where the available Channel State Information(CSI) at Base Station(BS)(CSIBS) is imperfe... A robust scheme is proposed to jointly optimize transmit/receive beamformers for Mul-tiple Input Multiple Output(MIMO) downlinks where the available Channel State Information(CSI) at Base Station(BS)(CSIBS) is imperfect.The criterion is to minimize the sum Mean Square Error(sum-MSE) over all users under a constraint on the total transmit power,which is a non-convex and non-linear problem.Observing from the first order optimization condition that the optimal trans-mit/receive beamformers are mutually dependent,the transmit/receive beamformers for each user are updated iteratively until the sum-MSE is minimized.Simulation results indicate that the proposed scheme can effectively mitigate the system performance loss induced by imperfect CSIBS. 展开更多
关键词 Multiple Input Multiple Output (MIMO) downlink Transmit/receive beamformer Imperfect Channel State Information (CSI)
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Iteration-stopping scheme of turbo receiver in turbo-MIMO systems
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作者 郑贱平 《High Technology Letters》 EI CAS 2008年第3期245-248,共4页
The iteration-stopping scheme of turbo receiver, consisting of an inner multiple-input multiple-output (MIMO) detector and an outer turbo decoder, was studied in this paper. In the inner MIMO detector, only the reli... The iteration-stopping scheme of turbo receiver, consisting of an inner multiple-input multiple-output (MIMO) detector and an outer turbo decoder, was studied in this paper. In the inner MIMO detector, only the reliabilities of bits in those channel slots which included unreliable information bits were updated when the outer turbo code was a systematical one. In conjunction with the trigger events for stopping the turbo decoding, an iteration-stopping scheme of turbo receiver was proposed. Simulation results show that the proposed scheme has lower complexity, but almost the same error performance compared to the scheme with predetermined maximum iterations. 展开更多
关键词 stopping scheme turbo receiver multiple-input multiple-output (MIMO) systems
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BLIND CHANNEL AND SYMBOL JOINT ESTIMATION IN COOPERATIVE MIMO FOR WIRELESS SENSOR NETWORK
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作者 Yan Zhenya Zheng Baoyu 《Journal of Electronics(China)》 2008年第4期439-444,共6页
In this paper,application of Sequential Quasi Monte Carlo(SQMC)to blind channel andsymbol joint estimation in cooperative Multiple-Input Multiple-Output(MIMO)system is proposed,which does not need to transmit training... In this paper,application of Sequential Quasi Monte Carlo(SQMC)to blind channel andsymbol joint estimation in cooperative Multiple-Input Multiple-Output(MIMO)system is proposed,which does not need to transmit training symbol and can save the power and channel bandwidth.Additionally,an improved version of SQMC algorithm by taking advantage of current received signal isdiscussed.Simulation results show that the SQMC method outperforms the Sequential Monte Carlo(SMC)methods,and the incorporation of current received signal improves the performance of theSQMC obviously. 展开更多
关键词 Cooperative Multiple-Input Multiple-Output (MIMO) Sensor network Sequential Quasi Monte Carlo (SQMC)
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