基于ICI干扰消除的OFDM线性时变信道估计方法

Linearly time-varying channel estimation method with ICI mitigation for OFDM systems

多普勒频移破坏了OFDM子载波的正交性,导致系统产生子载波间干扰。针对此问题,文中提出了一种基于ICI干扰消除的时变信道估计方法。该方法利用前一符号的信道斜率,消除当前系统符号所受到的ICI干扰。在归一化多普勒频小于0.15时,所述算法的信道估计均方误差比传统算法更小,系统误码率性能更优秀。

The Doppler frequency offset destroys the orthogonality of the subcarriers,resulting in the inter-carrier interference（ ICI）. In this paper,a novel channel-estimation method with ICI mitigation was proposed. The ICI of current symbol was cancelled using the channel of the previous symbol. The theoretical analysis and simulation results show that the proposed method has a better performance than the conventional method when the normalized Doppler shift is less than 0. 15.