中文摘要：

针对正交频分复用系统中Hadamard载波干扰矩阵估计方法估计效果差，提出了基于判决反馈的载波干扰矩阵估计方法。该方法根据载波干扰矩阵可用傅里叶变换矩阵对角化的特性，通过离散傅里叶变换的输出来估计载波干扰系数，再根据符号判决结果更新载波干扰矩阵，可较快地跟踪信道的快速衰落。实验仿真表明，该方法与Hadamard载波干扰矩阵估计方法相比，结合比特交织编码调制技术可进一步提高系统的载波干扰消除能力。

英文摘要：

Aiming at the drawbacks of larger estimation errors for Hadamard Inter-Carrier Interference（ICI） matrix estimation method, an decision feedback-based ICI cancellation method was proposed for Orthogonal Frequency Division Multiplexing （OFDM） communication systems. The ICI matrices for OFDM communication system could be diagonalized by Discrete Fourier Transform（DFT） matrices, and the output of DFT after decision could be used to estimate the ICI matrix. Using following decision symbols, ICI matrices could be updated instantly to trace the instantaneous changes of mobile recipient channels. Joined with Bit-Interleaved Coded Modulation（ BICM）, the method with comparison to Hadamard ICI estimation method can strengthen the resistibility of OFDM systems to ICI and this also is verified by simulation experiments.