一种低复杂度的MIMO-OFDM信道估计新方法.pdfVIP

第30卷第4期 电 子 与 信 息 学 报 V_01．30No．4 2008年4月 Journal of Electronics＆Information Technology Apr．2008 一 种低复杂度的MIMO．OFDM信道估计新方法 许国平 张 欣 杨大成 (北京邮电大学无线理论与技术实验室 北京 100876) 摘 要：该文基于m序列设计了一种适合多天线收发一正交频分复用(MIMO—OFDM)系统的时域信道估计新方法。 在时域OFDM符号之间插入附加循环前缀(CP)的m序列作为训练序列，在接收端将去掉循环前缀的接收序列与 指定的循环移位m序列作相关运算，然后利用m序列的二值自相关特性获得信道的冲激响应估计，从而得到信道 的频率响应估计。理论分析和仿真结果都表明：在频率选择性信道中，新方法在系统开销小、计算复杂度低的情况 下可以取得比传统算法更好的性能。 关键词：多天线收发一正交频分复用(MIMO—OFDM)；信道估计；m序列 中图分类号：TN92 文献标识码：A 文章编号：1009-5896(2008)04-0797-04 New MIMO—OFDM Channel Estimation Algorithm with Low Complexity Xu Guo-ping Zhang Xin Yang Da-cheng (Wireless Theories and Technologies(WT ，Belting University of Posts and Telecommunications， Beijing 100876，China) Abstract：Based on the m-sequence，a time-domain channel estimation algorithm for Multi-Input Multi—Output Orthogonal Frequency Division Multiplexing(MIMO—OFDM)is designed．The m-sequence with Cyclic Prefix(CP) is inserted between OFDM symbols in time domain as training sequence．The cross-correlation is calculated between the received sequence with CP removed and the appointed circular shifted m-sequence，which takes reliability of the estimation of channel impulse response on account of the two-valued auto-correlation property of the m-sequence，thereby the channel frequency response call be advisably decided．The results of both theoretical analysis and simulation show that the proposed algorithm possesses all impressive performance with less system overhead and lower computation burden than conventional algorithms． Key words：Multi—Input Multi-Output Orthogonal Frequency Division Multiplexing(MIMO—OFDM)；