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针对限幅正交频分复用(OFDM)系统中非线性失真导致信道估计性能瓶颈的问题,提出一种利用时间相关性的迭代信道估计算法.获取信道响应时,该算法综合运用了导频信息和历史信道信息,首先对硬判决后的OFDM符号进行限幅滤波,然后估计导频及数据子载波的非线性失真,最后进行信道再估计及符号再判决.理论分析及仿真结果表明:算法提高了信道估计和符号检测的准确度,而且算法只需1次再估计即可达到传统算法的均方误差理论极限,误码率性能提升了0.8dB.
Aiming at the bottleneck of channel estimation caused by nonlinear distortion in limiting orthogonal frequency division multiplexing (OFDM) system, an iterative channel estimation algorithm using time correlation is proposed. When obtaining channel response, the algorithm uses pilot Information and historical channel information, firstly, the hard-decision OFDM symbol is limited and then the nonlinear distortion of the pilot and data subcarriers is estimated, and finally the channel re-estimation and symbol re-judgment are carried out.Theoretical analysis and simulation results show that the algorithm Improve the accuracy of channel estimation and symbol detection, and the algorithm can reach the theoretical limit of the mean square error of the conventional algorithm with only one re-estimation, and the bit error rate performance is improved by 0.8 dB.