MMSE多用户检测技术研究与分析

Study and analysis of MMSE Multi-user Detection technology

在CDMA(Code Division Multiple Access,码分多址)通信系统中,由于多个用户的随机接入,所使用的扩频码集一般并非严格正交,码片之间的非零互相关系数将引起各用户间的干扰,这种干扰称为多址干扰.为了能够有效的抑制CDMA移动通信系统中的多址干扰,抗"远近效应",就引进了多用户检测(MUD).多用户检测技术在传统检测的基础上,能有效地消除MAI的影响,从而改善系统性能,增大系统容量.对系统中的多用户检测技术和与之密切相关的MMSE检测技术进行了研究.

In the CDMA （Code Division Multiple Access） mobile communication system, because of the multi-user＇s connection, the spread spectrum codes they use are normally not strictly orthogonal. The nonzero cross correlation coefficient between the codes will arouse the interference between the users, which is called Multi-access Interference （MAI）. In order to effectively curb the Multiple-access Interference and near-far resistance, the Multi-user Detection （MUD） technology is introduced. Based on the traditional detection technology, the Multi-User Detection technology can eliminate the influence of the MAI effectively, thus improves the system performance and increases its capacity. This article elaborates on the research done on the Multi-user Detection technology and the closely-related MMSE detection technology.