OFDM移动接收中的迭代干扰消除

摘要

针对正交频分复用系统在高速移动接收中存在快变衰落信道难以估计、子载波间干扰(ICI)过大的问题,提出基于迭代结构的信道估计算法和ICI消除算法.利用信道解码器输出判决信息,通过离散傅里叶变换实现信道估计,并对时变信道进行线性近似,以较低的计算复杂度消除子载波间的干扰.仿真结果表明,该方法可以对抗10％～15％的归一化多普勒频移.%In order to overcome the fast fading channels which are difficult to be estimated and the considerable Inter Carrier Interference(lCI) in highly mobile Orthogonal Frequency Division Multiplexing(OFDM) system, an iterative channel estimation and ICI mitigation algorithm are proposed. It uses feedback information from the channel decoder. Discrete Fourier Transform(DFT) based channel estimation is employed and linear approximation is used to mintage the ICI with low complexity. Simulation results show that the method allows reliable reception with normalized Doppler frequency at 10%～15%.