Study and analysis of MMSE Multi-user Detection technology

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.