Low Complexity Semi-blind Bayesian Iterative Receiver for MIMO-OFDM Systems over Time-varying Multi-path Channels  

作　　者：XIONG Chunlin WANG Degang WEI Jibo 

机构地区：[1]School of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China

出　　处：《Chinese Journal of Electronics》2010年第1期97-102,共6页电子学报（英文版）

摘　　要：Based the Variational Bayes expectation-maximization （VBEM） algorithm, a low complexity semi-blind Bayesian iterative receiver with joint signal detection and channel tracking is proposed for MIMO-OFDM systems over time-varylng multi-path channels. Since the VBEM algorithm provides the distribution estimation of all parameters, the proposed signal detection algorithm is different from the conventional ones in that the evaluation of extrinsic information is improved by considering channel estimation error in signal detection. In additions with the aid of the soft information provided by the signal detector, the Recursive VBEM （RVBEM） algorithm is derived to track the time-varying channels. Due to the high complexity of the RVBEM algorithm, a Time-frequency combined low complexity recursive VBEM （TF-LCRVBEM） algorithm is further proposed to reduce complexity. The analysis results demonstrate that the TF-LCRVBEM algorithm totally avoids computation of matrix inversion and obtains linear complexity. Moreover, the simuIation results show that the proposed receiver outperforms the conventional receiver, and suffer small performance loss at relatively high Signal-to-noise-ratios （SNRs）, compared with the optimal receiver with perfect Channel state information （CSI）.

关 键 词：MIMO-OFDM systems Bayesian itera-tire receiver Variational bayes Signal detection Recursivechannel tracking. 

分 类 号：TN929.5[电子电信—通信与信息系统] TN929.533[电子电信—信息与通信工程]