OFDM系统中迭代信道估计和解码研究  

THE JOINT ITERATIVE CHANNEL ESTIMATION AND DECODER ALGORITHM FOR THE OFDM SYSTEM

作　　者：马章勇[1] 刘雅然[1] 赵春明[1] 尤肖虎[1] 

机构地区：[1]东南大学移动通信国家重点实验室,南京210096

出　　处：《电子与信息学报》2003年第11期1441-1446,共6页Journal of Electronics & Information Technology

基　　金：863-317-03-01-02-04-20/MⅡ-C3G-02-04-002 项目;东大通信技术有限公司资助

摘　　要：该文针对 QPSK调制的 OFDM系统,根据 Turbo码的迭代解码原理,利用其软信息对信道估计的精度进行改进。同时为了防止由于解码器判决不准确造成误差的传播,提出了一种加权迭代估计算法,仿真结果表明,该方法与传统方法相比,能较显著地提高系统的性能。For the QPSK-modulated OFDM system, the channel estimation accuracy can be improved using of the soft information which is based on the iterative decoder principle of Turbo. Meanwhile, in order to avoid serious error propagation due to the error decision of the decoder, the weighted iterative estimation algorithm is proposed. The simulation results show that the proposed algorithm improves the system performance dramatically compared with the conventional scheme.

关 键 词：正交频分复用 TURBO码 软输入 软输出 SISO 迭代信道估计 信道解码 OFDM系统 

分 类 号：TN911.22[电子电信—通信与信息系统]