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为抑制多符号差分检测(MSDD)OFDM系统中的载波间干扰(ICI),分析了载波间干扰的统计性影响,并在最大似然序列估计过程中考虑了这些影响。提出了通过在最大似然序列估计过程中利用全部子载波信号的信息估计并抑制载波间干扰的方法。为降低计算复杂度,进一步提出了几种利用部分子载波信号信息的次优载波间干扰抑制法。仿真结果表明:所提出的次优方法在平坦及频率选择性瑞利信道中均可显著提高误码率性能。
To suppress the inter-carrier interference (ICI) in a multi-symbol differential detection (MSDD) OFDM system, the statistical impact of intercarrier interference is analyzed and these effects are taken into account in the maximum likelihood sequence estimation. A method of estimating and suppressing inter-carrier interference by using information of all subcarrier signals in the process of maximum likelihood sequence estimation is proposed. In order to reduce the computational complexity, several sub-optimal inter-carrier interference suppression methods using partial subcarrier signal information are further proposed. The simulation results show that the proposed suboptimal method can significantly improve the bit error rate performance in both flat and frequency selective Rayleigh channels.