频率选择性信道下空间相关MIMO的迭代检测技术

Iterative Detection of MIMO System over Frequency Selective and Spatial Correlative Channel

给出了一种频率选择性信道下空间相关M IMO的系统模型,其发送端采用准循环系统RA码,接收端采用一种对空间相关和非相关信道均适用的软干扰消除迭代检测算法。该算法首先采用基于最小均方误差检测(MMSE)的滑动窗口模型进行干扰消除,然后采用多天线联合最大似然检测(ML)以得到软信息,再将得到的软信息传递到译码器译码并输出发送比特的软信息作为下一次迭代的先验信息,即完成一次迭代。此模型能够取得比较好的误码率性能(BER),其改进方案既增加了发送端的调制域分集,性能又有提升。作为比较,基于软干扰消除的逐天线MMSE迭代检测的方案(ABA SC/MMSE)性能很差。仿真结果也证明了以上观点。

A model of MIMO system over spatial correlative and frequency selective channel is constructed. The non - binary RA codes are adapted as channel codes at the transmitter, and a correlative and uncorre- lated channel adaptive iterative detection method using soft interference cancellation is adapted at the re- ceiver. In this method, the sliding window based on MMSE method is used to cancel inter - symbol interfer- ence（ISI） , then joint antenn as maximum likelihood detection is performed, finally soft information is pas- sed from detector to decoder, thus one iteration process （called JAD SC/MMSE） is completed. This model brings very low bit error rate（ BER）, and its advanced scheme, where diversity in modulation field is added at the transmitter, can achieve better performance. For contrast, BER of the common scheme, based on an- tenna by antenna detection which uses MMSE only （ ABA SC/MMSE） is very poor. The simulation result also proves the opinion above.