一种改善Turbo乘积编码OFDM系统性能的新方法  

A Novel Method for Improving Performance of Turbo Product Coded OFDM

作　　者：刘伟[1] 张海林[1] 刘增基[1] 

机构地区：[1]西安电子科技大学ISN重点实验室

出　　处：《电路与系统学报》2004年第2期14-17,68,共5页Journal of Circuits and Systems

基　　金：国家自然科学基金重大研究计划项目(90104019);武器装备预研基金(51421040101DZ0157)

摘　　要：本文提出一种利用对译码器软信息限幅来改善多径衰落信道中Turbo乘积编码OFDM(TPC-OFDM)系统性能的新方法。通过对不同多径衰落信道中QPSK映射和16QAM映射的TPC-OFDM系统性能的数值仿真,结果表明在10-5误比特率下,这种新方法比传统的迭代译码大约有6-10dB的改进,对严重多径环境下TPC-OFDM系统的错误平底也有明显的改进。A novel method by clipping the input soft information of decoder to improve the performance of turbo product coded OFDM (TPC-OFDM) system in multipath fading channels is proposed. Numerical simulation on TPC-OFDM mapped QPSK and 16QAM signals in different multipath fading channels show that using the proposed method, the performance of TPC-OFDM can be improved from 6dB to 10dB at error bit rate of 10-5 over the conventional iterative decoding. The error floor of TPC-OFDM in severe multipath fading channels can also be reduced efficiently.

关 键 词：多径衰落信道 正交频分复用 TURBO乘积码 限幅器 迭代译码 

分 类 号：TN911.22[电子电信—通信与信息系统]