一种使用MUML-CMVDR接收机的SIMO CDMA系统

A New SIMO CDMA System UsingMUML-CMVDR Receiver

提出了一种使用基于多用户ML估计,可以抑制多址干扰(MAI)、符号间干扰(ISI)和噪声的带限制条件的MVDR接收机(MUML CMVDRReceiver)的SIMOCDMA系统.给出了SIMOCDMA系统模型和CDMA多用户、多径的信道模型,用ML方法进行信道参数估计,然后利用估计到的信道参数给出了分部加权和整体加权2种CMVDR接收机.进行了系统模拟,并对分部加权和整体加权2种MUML CMVDR接收机的性能、SIMOCDMA系统和其它系统的性能分别进行了比较.

A simple SIMO(single input multiple output)CDMA system with high performance,which uses constrained minimum variance distortionless response (CMVDR)receiver based on maximum likelihood (ML) estimation of multiuser (MUML-CMVDR receiver)to suppress multiple access interference(MAI), intersymbol interference(ISI)and noise,is proposed.The SIMO CDMA system model and CDMA multiuser's multipath channel model are presented.The parameters of channels are estimeted by ML method.With these estimated parameters, two CMVDR receivers,i.e., separately weighted and unitarily weighted,are proposed.The simulations of the proposed SIMO CDMA system are also presented.The performances of the separately weighted and unitarily weighted MUML-CMVDR receiver,and also the performances of the proposed SIMO CDMA system and other systems are compared and discussed.