高速移动信道中的ICI消除算法

针对当前研究中的子载波干扰(ICI)消除算法不支持高速移动环境的缺点，提出一种基于线性时变模型的ICI迭代消除算法。使用相邻3个正交频分复用(OFDM)信号帧对信道进行近似处理，将时变的无线信道建模为基于每条信号径的线性时变信道，信道线性时变斜率可通过相邻的导频符号获得，这样就可以预先构造频域干扰矩阵，然后通过循环迭代的方法将接收符号中的干扰消除。仿真结果表明，本文提出的ICI迭代消除算法可有效消除高速移动信道中的ICI。在多普勒偏移小的条件下，此算法带来的性能提升更大。

ICI cancellation algorithm for high-speed mobile channel

Aiming at the current Inter-Carrier Interference(ICI) cancellation algorithm cannot be applied in high-speed mobile scenario, a linear time-varying model based ICI iterative cancellation algorithm is proposed. The proposed algorithm approximately processes the channel by using three adjacent Orthogonal Frequency Division Multiplexing(OFDM) signal frames. The time-varying wireless channel is modeled as a channel that every path of it is linear and time-varying, and the slope of each path can be derived from the adjacent pilot symbols. Thus the frequency-distracting matrix can be pre-constructed, and then the interference in received symbols is cancelled by loop iteration method. Simulation results show that the proposed ICI iteration algorithm can effectively eliminate the ICI in high-speed mobile channel and the performance outperforms especially under the condition of low Doppler shift.