一种改进的单音干扰下OFDM系统盲信道估计算法

摘要

在相关检测的OFDM系统中，信道估计具有十分重要的意义。研究了一种在单音干扰环境下的OFDM系统中基于预编码的盲信道估计方案。利用接收的干扰信号的频域信息对单音干扰信号进行准确估计与重构，有效地消除了干扰信号的影响，提高了单音干扰下盲信道估计的准确性。与其他盲信道估计算法相比，基于预编码的盲信道估计算法具有较低的运算复杂度以及较快的收敛速度。仿真结果表明了该算法在干扰估计以及信道估计两方面都取得了较好的性能。%Channel estimation is very important in the coherent detection Orthogonal Frequency Division Multi-plexing(OFDM)systems. A precoded-based blind channel estimation method for OFDM systems in the presence of single tone interference is studied. By using the frequency domain information of received signals to accurately estimate and reconstruct the interference signals,the proposed method can eliminate the effects of interference signals and improve the accuracy of channel estimation. Compared with other blind channel estimation algo-rithms,the precoded-based blind channel estimation has low complexity and fast convergence speed. The simu-lation results show that the proposed method achieves good performances both in the estimation of interferences and channel.