基于失配序列的OFDM信道估计

本文提出了一种利用失配序列进行OFDM信道估计的新方法.在发端将失配序列加入到OFDM信号中作为训练序列,接收端将收到的去掉循环前缀的失配序列与失配滤波器系数的循环移位序列做相关运算,利用失配序列的优良自相关特性,估计出信道的冲击响应,进而得到子载波处信道的频率响应.理论分析和仿真结果表明,该方法计算复杂度低,估计速度快、精度高,系统的BER性能好.

Channel Estimation in OFDM Systems Based on Mismatched-Sequence

A new approach which using mismatched-sequence to channel estimation in OFDM systems is proposed. In the scheme, mismatched-sequence is added to OFDM signal as a training sequence at sender, the receiver calculates the cross-correlation between the received mismatched sequence with CP removed and the circular shifted mismatched filter coefficient. By making use of the auto-correlation property of the mismatched-sequence the channel impulse response can be estimated and then the channel frequency response can be acquired. Theoretical analysis and simulation results show that the new algorithm has good property of low-complexity, accurate estimation and better BER performance.