正交频分复用系统中的判决反馈干扰消除方法  

Decision Feedback-based Intercarrier Interference Cancellation Method in OFDM Communication System

作　　者：卢照敢[1] 张青苗[2] 张太镒[1] 

机构地区：[1]西安交通大学电子与信息工程学院,陕西西安710049 [2]华东交通大学信息工程学院,江西南昌330013

出　　处：《计算机应用研究》2007年第4期68-70,共3页Application Research of Computers

基　　金：国家自然科学基金资助项目(40274019)

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。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.

关 键 词：正交频分复用 载波干扰 干扰消除 判决反馈 

分 类 号：TN911.72[电子电信—通信与信息系统]