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MMSE relay precoding schemes based on quantization error compensation for multi-relay system

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science china(information sciences) 2010年第12期53卷 2548-2556页

作者： LI Ting 1,2 & YANG LuXi 2 1 College of Communication and information engineering,nanjing university of Posts and Telecommunications,nanjing 210003,china 2 school of information science and engineering,southeast university,nanjing 210096,china College of Communication and information engineering Nanjing University of Posts and Telecommunications Nanjing China school of information science and engineering Southeast University Nanjing China

In order to deal with the performance degradation resulting from the quantization error,this paper introduces the statistics of Grassmannian codebook's quantization error into relay precoding design for multirelay *** on the two-step MMSE optimization algorithm for relay precoding and receiver equalizing with full feedback under QoS requirements,we first propose a limited feedback two-step MMSE optimization scheme for relay precoding and receiver equalizing with quantization error compensation,and then we propose a limited feedback joint MMSE optimization scheme for relay precoding and receiver equalizing with quantization error compensation subject to a global power constraint at the output of *** results show that the proposed joint MMSE optimization scheme with quantization error compensation has a much lower bit-error rate than the two-step MMSE optimization scheme with quantization error compensation and the joint MMSE optimization scheme without quantization error compensation.

关键词： multi-relay precoding limited feedback minimum mean square error

Asymptotic SEP of MIMO beamforming in two-hop AF relaying systems

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science china(information sciences) 2012年第2期55卷 377-383页

作者： FU YouHua1,HAN YuJie2,YANG LvXi2,ZHU WeiPing3 & LIU Chen1 1school of Electronic science and engineering,nanjing university of Posts and Telecommunications,nanjing 210003,china 2school of information science and engineering,southeast university,nanjing 210096,china 3Department of Electrical and Computer engineering,Concordia university,Montreal H3G 1M8,Canada school of Electronic science and engineering Nanjing University of Posts and Telecommunications Nanjing China school of information science and engineering Southeast University Nanjing China Department of Electrical and Computer engineering Concordia University Montreal Canada

This paper derives an asymptotic average symbol error probability(SEP)expression for multiple-input multiple-output(MIMO)two-hop amplify-and-forward(AF)relay systems with optimal *** analysis at high signal-to-noise ratio(SNR)quantifies the diversity order and array gain,which are valid for any antenna numbers of the terminals and arbitrary channel fading *** is also proved that the system performance is dominated by the relatively degraded one of the two-hop *** results based on the simple expressions provide valuable insights into the performance and practical design considerations of MIMO AF networks.

关键词： MIMO relay networks optimal beamforming symbol error probability(SEP) diversity order

Mutual Coupling Calibration for Smart Antennas in CDMA Communication Systems

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Mutual Coupling Calibration for Smart Antennas in CDMA Commu...

IEEE 2007 International Symposium on Microwave,Antenna,Propagation and EMC Technologies for Wireless Communications(ISMAPE-2007)

作者： Lin Min~(1,2) Lu Ruimin~1 and Yang Luxi~2 (1.nanjing Institute of Telecommunication Technology,nanjing,210007,china 2.school of information science and engineering,southeast university,nanjing,210096,china)

A novel mutual coupling calibration method is presented for smart antennas in CDMA communication *** proposed method first uses the measured smaller mutual coupling coefficients as a prior knowledge and relies on processing the covariance matrix of the signal vector after pseudo noise(PN) despreading to estimate the other coupling coeffi- cients and direction-of-arrivals(DOAs) of the desired users *** mutual coupling effect can easily be eliminated with matrix compensation *** with previous blind calibration methods,the proposed method shows less computation time and higher calibration *** simulation results demonstrate that the new method is correct and effective.

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基于观测似然重要性采样的粒子滤波算法

系统仿真学报 2009年第12期21卷 3705-3709页

作者：高建坡韦志辉孟迎军吴镇扬南京理工大学电子工程与光电技术学院南京210094 东南大学信息科学与工程学院南京210096

针对粒子滤波中如何来设计重要性采样函数进行动态粒子传播这个重要问题,提出了一种新的基于观测似然重要性采样的粒子滤波算法,该算法打破了常规粒子滤波先按某一重要性采样函数进行采样,再用观测似然进行粒子权重更新的思路,而是直接... 详细信息

针对粒子滤波中如何来设计重要性采样函数进行动态粒子传播这个重要问题,提出了一种新的基于观测似然重要性采样的粒子滤波算法,该算法打破了常规粒子滤波先按某一重要性采样函数进行采样,再用观测似然进行粒子权重更新的思路,而是直接根据观测似然进行采样,然后再用先验转移概率进行粒子权重更新。由于算法在采样的过程中用到了观测似然函数,这样保证大多数粒子点都分布在高观测似然区域,极大提高了粒子的利用效率,实验证明基于观测似然重要性采样粒子滤波的性能明显优于当今流行的标准粒子滤波,扩展Kalman粒子滤波以及unscented粒子滤波。

关键词：粒子滤波重要性采样重要性采样函数动态估计

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Color image enhancement based on HVS and PCNN

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science china(information sciences) 2010年第10期53卷 1963-1976页

作者： ZHANG YuDong, WU LeNan , WANG ShuiHua & WEI Geng school of information science & engineering, southeast university, nanjing 210096, china school of information science & engineering Southeast University Nanjing China

To enhance color images more effectively, a novel strategy is presented in this paper. We firstly translate the image to be enhanced from RGB space into HIS space, secondly keep its H component unchanged, and thirdly stretch its S component exponentially, and at last process its I component in the following manner: couple both the gray value and the spatial information into an inner activity item of corresponding neuron, integrate the human visual system into a dynamic component of corresponding neuron, and compare the inner activity item with dynamic component to obtain the enhanced image. Experiments demonstrate the effectiveness and validity of our strategy.

关键词： image enhancement human visual system (HVS) pulse coupled neural network (PCNN) color image

Restrictive mechanism of flow control among non-cooperative Internet users

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science china(information sciences) 2011年第1期54卷 12-22页

作者： TAO Jun1,2,ZHONG Xiao1,2 & LU YiFei1,2 1Key Laboratory of Computer Network and information Integration,southeast university, Ministry of Education,nanjing 210096,china 2school of Computer science and engineering,southeast university,nanjing 210096,china Key Laboratory of Computer Network and information Integration Southeast University Ministry of Education Nanjing China school of Computer science and engineering Southeast University Nanjing China

The flow and congestion control methods based on one-shot game model with non-cooperative game theory can explain the non-cooperative behavior of Internet ***,the low effciency of equilibrium solutions affects their *** the behavior of flow and congestion control based on infinitely repeated game models is addressed;the repeated and infinitely repeated flow and congestion control game model is presented; the existence and optimization of the Nash equilibrium point are proved;the discount factor in repeated game is discussed;the punishment and threat strategy to users'misbehavior is studied in N-users infinitely flow control game;the punishment restrictive method of users'behavior is designed in infinitely and finitely games;finally,a flow control algorithm based on repeated game,FCAR,is provided based on the conclusions of repeated game *** results of experiment and simulation show that FCAR algorithm could regularize and restrict users' misbehavior *** algorithm can also make non-cooperative Internet users achieve cooperation in order to optimize the utility of the whole flow and congestion control system.

关键词： Nash equilibrium utility infinitely and finitely repeated game flow and congestion control

Spectral Estimation based on Filter Bank and Cepstrum Thresholding for Cognitive Radios

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china Communications 2009年第1期6卷 92-98页

作者： Cao Zhiping, Bi Guangguo, Zhang Zaichen National Mobile Communication Research Laboratory, school of information science and engineering, southeast university, nanjing 210096, china National Mobile Communication Research Laboratory School of Information Science and Engineering Southeast University Nanjing 210096 China

Spectrum sensing plays an important role in cognitive radio (CR). Nonparametric spectrum estimation is considered as a feasible candidate for CR. Some filter bank based periodogram algorithms, such as Thomson’s multitaper spectral estimator, can achieve fine spectral dynamic range1 but have large estimation variance. On the other hand, recently, Cepstrum Thresholding is proposed to reduce the variance of periodogram estimation. In this paper, we combine these two methods to achieve spectral dynamic range and variance request at the same time.

关键词： spectrum analysisfifilter bank cepstrum thresholding.

Selection of unitary operations in quantum secret sharing without entanglement

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science china(information sciences) 2011年第9期54卷 1837-1842页

作者： XU Juan 1,CHEN HanWu 1,LIU WenJie 1,2 & LIU ZhiHao 1 1 school of Computer science and engineering,southeast university,nanjing 210096,china 2 school of Computer and Software,nanjing university of information science and Technology,nanjing 210044,china school of Computer science and engineering Southeast University Nanjing China school of Computer and Software Nanjing University of Information Science and Technology Nanjing China

We propose a substitute-Bell-state attack strategy for quantum secret sharing schemes without entanglement,as well as a definition of the minimum failure probability of such attack strategy.A quantitative analysis of security degrees corresponding to different unitary operations is also provided,when the secret sharing schemes without entanglement are stricken by substitute-Bell-state *** a result,the relation between the selection of unitary operations and the effect of substitute-Bell-state attack is shown,which can serve as an important guidance for the selection of unitary operations in designing and implementing quantum secret sharing schemes.

关键词： quantum secret sharing substitute-Bell-state attack unitary operation minimum failure probability

Heuristic for no-wait flow shops with makespan minimization based on total idle-time increments

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science in china(Series F) 2008年第7期51卷 896-909页

作者： LI XiaoPing1,2 & WU Cheng3 1 school of Computer science & engineering, southeast university, nanjing 210096, china 2 Key Laboratory of Computer Network and information Integration (southeast university), Ministry of Education, nanjing 210096, china 3 Department of Automation, Tsinghua university, Beijing 100084, china school of Computer science & engineering Southeast University Nanjing China Key Laboratory of Computer Network and information Integration (southeast university) Ministry of Education Nanjing China Department of Automation Tsinghua University Beijing China

No-wait flow shops with makespan minimization are classified as NP-hard. In this paper, the optimization objective is equivalently transformed to total idle-time minimization. The independence relationship between tasks is analyzed, and objective increment properties are established for the fundamental operators of the heuristics. The quality of the new schedules generated during a heuristic is judged only by objective increments and not by the traditional method, which computes and compares the objective of a whole schedule. Based on objective increments, the time complexity of the heuristic can be decreased by one order. A seed phase is presented to generate an initial solution according to the transformed objective. Construction and improvement phases are introduced by experimental analysis. The FCH （fast composite heuristic） is proposed and compared with the most effective algorithms currently available for the considered problem. Experimental results show that the effectiveness of the FCH is similar to that of the best methods but requires far less computation time. The FCH can also be efficient in real time scheduling and rescheduling for no-wait flow shops.

关键词： no-wait flow shops heuristic makespan Tabu search

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