中文摘要：

针对时变信道OFDM系统中的子载波间干扰（ICI）抑制问题,基于时变信道频域响应矩阵（CFR）的带状近似,提出一种低复杂度双迭代均衡方案。通过调整CFR矩阵的带宽大小,有效实现了性能和复杂度之间的良好折中。在检测过程中,首先利用线性ICI抵消降低了由于CFR矩阵的带状近似造成的性能恶化,其次通过迭代软干扰抵消检测算法来获得由信道时变带来的多普勒分集增益。理论分析和仿真结果表明,同传统线性最小均方误差时变信道均衡算法相比,该算法同时具有性能和复杂度的优势。

英文摘要：

Aiming at mitigating intercarrier interference（ICI） caused by channel time variation in orthogonal frequency division multiplexing（OFDM） systems,a low-complexity doubly iterative equalization scheme is proposed by exploiting the approximately banded structure of channel frequency response（CFR） matrix.The scalability of band size of CFR matrix enables a good tradeoff between performance and complexity.In this scheme,a linear ICI canceller is used to reduce performance degradation caused by the band approximation of CFR matrix,and an iterative equalizer with soft interference cancellation is employed to gain the Doppler diversity induced by channel time variation.Theoretic analysis and simulation results indicate that the proposed technique has both performance and complexity advantages over the classic linear minimum mean square error（MMSE） equalizer in time varying channels.