MIMO-OFDM-CDM系统低复杂度Turbo检测  

A Low Complexity Turbo Detection Algorithm for MIMO-OFDM-CDM System

作　　者：张元涛[1] 杨大成[1] 

机构地区：[1]北京邮电大学电信工程学院,北京100876

出　　处：《无线电工程》2007年第7期20-22,57,共4页Radio Engineering

摘　　要：提出了将码分复用(CDM)模块看作系统等效信道的一部分,从而在MIMO-OFDM-CDM系统中引入Turbo迭代检测的措施。使用Turbo迭代检测可以通过解码器和解调器之间软信息的多次迭代提高译码的性能。根据CDM模块的特点,提出了将等效多天线之间的干扰视为高斯噪声,从而降低Turbo迭代检测算法复杂度的措施。仿真结果表明,在系统中使用Turbo迭代检测可以在有限次迭代后达到比传统算法更低的误码率。The method of using Turbo iterative detection in MIMO - OFDM - CDM system is proposed with CDM module considered as a part of equivalent channel, Turbo iterative detection can improve the decoder performance through iteratively exchanging soft values between the decoder and the demodulator, Meanwhile, according to the characteristic of CDM module, some methods are proposed for decreasing the complexity of Turbo iterative detection in the system by taking equivalent multi-stream interference as Gaussian noise,The simulation results show that Turbo iterative detection, compared with conventional detection algorithm, has lower bit error rate after several times of iteration.

关 键 词：正交频分复用 多天线 码分复用 TURBO检测 

分 类 号：TN911.22[电子电信—通信与信息系统]