FAST CONVERGENT MONTE CARLO RECEIVER FOR OFDM SYSTEMS  

作　　者：WuLili LiaoGuisheng BaoZheng ShangYong 

机构地区：[1]KeyLabforRadarSignalProcessing,XidianUniversity,Xi＇an710071,China [2]DepartmentofElectronics,PekingUniversity,Beijing100871,China [5]KeyLabforRadarSignalProcessing,XidianUniversity,Xi＇an710071,China

出　　处：《Journal of Electronics(China)》2005年第3期209-219,共11页电子科学学刊（英文版）

基　　金：Partially supported by the National Natural Science Foundation of China (No.60172028).

摘　　要：The paper investigates the problem of the design of an optimal Orthogonal Fre- quency Division Multiplexing (OFDM) receiver against unknown frequency selective fading. A fast convergent Monte Carlo receiver is proposed. In the proposed method, the Markov Chain Monte Carlo (MCMC) methods are employed for the blind Bayesian detection without channel es- timation. Meanwhile, with the exploitation of the characteristics of OFDM systems, two methods are employed to improve the convergence rate and enhance the efficiency of MCMC algorithms. One is the integration of the posterior distribution function with respect to the associated channel parameters, which is involved in the derivation of the objective distribution function; the other is the intra-symbol differential coding for the elimination of the bimodality problem resulting from the presence of unknown fading channels. Moreover, no matrix inversion is needed with the use of the orthogonality property of OFDM modulation and hence the computational load is significantly reduced. Computer simulation results show the effectiveness of the fast convergent Monte Carlo receiver.The paper investigates the problem of the design of an optimal Orthogonal Fre- quency Division Multiplexing (OFDM) receiver against unknown frequency selective fading. A fast convergent Monte Carlo receiver is proposed. In the proposed method, the Markov Chain Monte Carlo (MCMC) methods are employed for the blind Bayesian detection without channel es- timation. Meanwhile, with the exploitation of the characteristics of OFDM systems, two methods are employed to improve the convergence rate and enhance the efficiency of MCMC algorithms. One is the integration of the posterior distribution function with respect to the associated channel parameters, which is involved in the derivation of the objective distribution function; the other is the intra-symbol differential coding for the elimination of the bimodality problem resulting from the presence of unknown fading channels. Moreover, no matrix inversion is needed with the use of the orthogonality property of OFDM modulation and hence the computational load is significantly reduced. Computer simulation results show the effectiveness of the fast convergent Monte Carlo receiver.

关 键 词：Frequency selective fading Orthogonal Frequency Division Multiplexing (OFDM) Markov Chain Monte Carlo (MCMC) methods Blind Bayesian detection BIMODALITY 

分 类 号：TN929.5[电子电信—通信与信息系统]