通信学报2011，Vol.32Issue(1)：87-93,7.
改进的高效 MIMO-OFDM 系统 EM 信道估计算法
Improved and efficient EM channel estimation algorithm for MIMO-OFDM systems
摘要
Abstract
For multiple-input multiple-output with orthogonal frequency division multiplexing (MIMO-OFDM) systems,the error floor (EF) phenomenon at high signal noise rate (SNR) was induced by the expectation maximum (EM) channel estimation algorithm.In addition, the data transmission efficiency was declined obviously with the increasing number of transmit antennas.According to these problems, an improved and efficient EM channel estimation algorithm was proposed.Firstly, an accurate and equivalent signal model was introduced to derive a modified EM algorithm, which improved the estimation performance at high SNR.Next, to enhance the data transmission efficiency and further the estimate performance of the proposed algorithm, phase orthogonal pilots sequences and joint estimation were carded out over multiple OFDM symbols respectively.Simulation results show that the proposed algorithm has better estimation performance and higher data transmission efficiency.关键词
多输入输出/正交频分复用/信道估计/期望最大化/误差地板Key words
MIMO/ OFDM/ channel estimation/ EM/ error floor分类
信息技术与安全科学引用本文复制引用
许鹏,汪晋宽,祁峰..改进的高效 MIMO-OFDM 系统 EM 信道估计算法[J].通信学报,2011,32(1):87-93,7.基金项目
国家自然科学基金项目资助项目(60874108,60904035,61004052) （60874108,60904035,61004052）
河北省教育厅自然科学研究指导计划资助项目(Z2009105) （Z2009105）
辽宁省自然科学基金资助项目(20102064) （20102064）
中央高校基本科研业务费资助项目(N100604004) （N100604004）
