Low complexity recursive channel tracking algorithms for MIMO-OFDM

被引：0
作者：
Xiong C.-L. [1 ]
Wang D.-G. [1 ]
Wei J.-B. [1 ]
机构：
[1] School of Electronic Science and Engineering, National University of Defense Technology
来源：
Dianzi Yu Xinxi Xuebao/Journal of Electronics and Information Technology | 2010年 / 32卷 / 01期
关键词：
Bayesian iterative receiver; MIMO-OFDM system; Recursive channel tracking; Signal detection; Variational Bayes (VB);
D O I：
10.3724/SP.J.1146.2008.01667
中图分类号：
学科分类号：
摘要：
Based on the Variational Bayes (VB) method, a novel low complexity semi-blind Bayesian iterative receiver with joint signal detection and channel tracking is proposed for MIMO-OFDM systems over time-varying multi-path channel. Using the VB Expectation-Maximization (VBEM) algorithm, a Recursive VBEM (RVBEM) channel tracking algorithm is derived for the newly proposed receiver. Since the RVBEM algorithm requires computation of matrix inversion, a Time domain and Frequency domain combined Low Complexity RVBEM (TF-LCRVBEM) algorithm is further proposed to reduce complexity. It is demonstrated that the TF-LCRVBEM algorithm completely avoids matrix inversion and obtains linear complexity by making some reasonable approximations. The simulation results show that the proposed receiver not only outperforms the conventional receiver, but also can achieve near optimal performance.
引用
收藏
页码：123 / 128
页数：5
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