一种适用于正交频分复用系统的ICI抑制改进算法

An Improved Inter-carrier Interference Mitigation Algorithm for OFDM Systems

针对高速移动环境下多普勒频偏造成移动信道的快衰落和正交频分复用(OFDM)系统中子载波间干扰(ICI)问题,基于排序串行干扰抵消(OSIC)思想和空间交替广义期望最大化算法(SAGE),提出了一种改进SAGE算法,用于ICI抑制.仿真结果表明,该算法提高了在ICI环境下信道估计的准确性,从而获得带宽效率和复杂度的均衡,对系统性能改善尤为明显,在不增加复杂度的情况下,性能优于现有的SAGE算法.

Based on the space alternating generalized expectation-maximization（SAGE） algorithm,and the ordered serial interference cancellation（OSIC） approach,an ICI mitigation algorithm is proposed for OFDM systems over multipath fading and rapidly time-varying channels.Computational complexity investigation and simulation results indicate that the proposed algorithm significantly outperforms the existing methods based on SAGE,with almost the same complexity,especially for the large Doppler shift.Therefore,the proposed algorithm is particularly well suited for highly mobile environments.