一种新的基于PN码导频的OFDM信道估计方法  

A New Channel Estimation Methd Based on Pseudo Random Code Pilots in OFDM Systems

作　　者：尹庆奇[1] 江铭炎 

机构地区：[1]山东大学信息科学与工程学院，济南250100 [2]不详

出　　处：《信息技术与信息化》2005年第1期61-64,共4页Information Technology and Informatization

摘　　要：根据PN码的性质 ,针对OFDM通信系统提出了一种新的信道估计方法 ,不仅适用于慢变信道 ,也适用于快变信道。理论上分析了新方法的计算复杂度和估计性能。仿真表明 ,在多径信道下新估计方法的误比特性能优于最小二乘估计大约 2dB ,与线性最小均方误差估计性能相似 ,但是计算量远小于线性最小均方误差估计。According to the qualities of pseudo random code sequence, this paperprovides a new algorithm of channel estimation in orthogonal frequency division multiplexing (OFDM) systems which is not only suitable to slow time varying channel but to fast one. We analyze the complexity and the performance of the new estimation algorithm theoretically. Simulations show that the bit error rate and mean square error of this new algorithm are approximate to linear minimum mean square error (LMMSE) algorithm, better than least square (LS) algorithm by 2 dB, but its complexity is less than that of LMMSE algorithm.

关 键 词：正交频分复用 信道估计 PN码 最小二乘 线性最小均方误差 伪随机码序列 移动通信 

分 类 号：TN925[电子电信—通信与信息系统]