衰落信道下的新型MMSE接收机

提出了一种适用于衰落信道的新型MMSE接收机,每个用户只需要一个MMSE多用户检测器,结构简单.分析了下行CDMA链路中MMSE多用户检测(MMUD)的稳态性能,在Wiener解的基础上,证明了MMUD输出的信号干扰比和抗远近效应能力主要由合成扩频码的相关阵决定.仿真结果表明,在一般多径信道下,MMUD比Rake接收机能更好地抑制多址干扰和多径干扰,并能有效地克服远近效应,大大提高用户容量.

A Novel MMSE Receiver for Fading Channel

A novel MMSE receiver suitable for fading channel is proposed,which needs only one MMSE multiuser for each user.Thus,its structure is simply.We analyze the steady state performance of the novel MMSE multiuser detection(MMUD) for downlink CDMA. On the basis of wiener solution,we prove that the output SIR and near far resistance of MMUD are mainly affected by the correlation matrix of combined spreading signatures.Simulations indicate that in general multipath channel,MMUD can suppress multipleaccess interference and multipath interference more effectively than the Rake receiver,and achieve good near far resistance,which brings great capacity achievement.