高技术通讯2011，Vol.21Issue(7)：701-706,6.DOI:10.3772/j.iasn.1002-0470.2011.07.006
基于修正EM的高效MIMO-OFDM系统MAP信道估计算法
An efficient MAP channel estimation algorithm based on modified EM for MIMO-OFDM Systems
摘要
Abstract
Aiming at the problem that the maximum a posteriori(MAP)channel estimation algorithm based on the expectation maximum(EM)for MIMO-OFDM systems generally suffers from the error floor(EF)phenomenon and the low efficiency in data transmission, the paper proposes an improved MAP channel estimation algorithm based on the modified EM, which is more efficient in data transmission. The new algorithm introduces a more accurate system model so as to improve the EF phenomenon caused by the EM-based MAP estimation algorithm in high signal-to-noise ratio(SNR)systems, and uses multiple OFDM symbols to implement the joint channel estimation to enhance the data transmission efficiency and improve the mean square error(MSE)performance. The simulation results show that the proposed algorithm can weaken the EF phenomenon, lower the estimation MSE, and raise the data transmission efficiency.关键词
多输入输出(MIMO)/正交频分复用(OFDM)/信道估计/期望最大化(EM)/最大后验(MAP)/误差地板(EF)Key words
multiple-input multiple-output(MIMO)/orthogonal frequency division multiplexing(OFDM)/channel estimation/expectation maximum(EM)/maximum a posteriori(MAP)/error floor(EF)引用本文复制引用
许鹏,汪晋宽,祁峰..基于修正EM的高效MIMO-OFDM系统MAP信道估计算法[J].高技术通讯,2011,21(7):701-706,6.基金项目
国家自然科学基金(60874108,60904035)资助项目. （60874108,60904035）
