基于判别分析阈值滤波协作通信系统信道估计

在基于正交频分复用技术的放大转发协作通信系统中,针对传统信道估计算法估计精度差的问题,提出一种基于判别分析阈值滤波离散傅立叶变换信道估计算法。该算法首先通过设置改进的阈值门限初步获得信道有效抽头,然后利用马氏距离判别分析对已检测出的信道抽头修正。仿真结果表明:和传统方法相比,提出方法有效地滤除了信道估计中的噪声,改善了信道估计精度和误码率性能。

Channel Estimation Based on Decision Analysis and Threshold Filtering for Cooperative Communication Systems

In amplify and forward cooperative communication system based on orthogonal frequency division multiplexing,for the defect of poor estimation accuracy in the traditional channel estimation algorithm,an improved DFT channel estimation algorithm based on decision analysis and threshold filtering is proposed. The proposed algorithm first obtain preliminary effective channel tap by setting the improved threshold and then modify the detected channel tap by employing the Mahalanobis distance decision analysis. Simulation results show that compared with the traditional methods,the proposed method can improve the channel estimation accuracy and the BER performance by effectively filtering the noise in the channel estimation.