STBC MIMO CDMA系统CMVDR接收机研究

Research of CMVDR receiver for STBC MIMO CDMA system

提出了 STBC MIMOCDMA 系统中一种新的基于多用户 ML 估计的带制约的最小方差无失真响应(CMVDR)接收机,能有效抑制多址干扰(MAI)和符号间干扰(ISI)。给出了多用户、多径的 STBC MIMO CDMA 系统信道模型及 ML 参数估计,并给出了分部加权和整体加权两种 CMVDR 接收机,本接收机也适用于 SIMO CDMA系统。进行了系统模拟,并对分部加权和整体加权两种 CMVDR 接收机的性能以及自适应 CMMSE 接收机的性能进行了比较分析。

A new constrained minimum variance distortionless response (CMVDR) receiver based on maximum likelihood (ML) estimation of multiuser for STBC MIMO CDMA system with high performance, which was used to suppress multiple access interference (MAI) and intersymbol interference (ISI) well, was proposed. The STBC MIMO CDMA system model and channel model were given. Using the channel parameters estimated by ML method, two CMVDR receivers, separately weighted and unitarily weighted, were proposed. These receivers could also be applied to SIMO CDMA system. The simulation results of STBC MIMO CDMA system and SIMO CDMA system using the proposed CMVDR receiver are presented. The comparison of performance between the separately weighted CMVDR receiver and unitarily weighted CMVDR receiver, and the comparison of systems using the proposed CMVDR receiver with adaptive CMMSE (constrained minimum mean square error) systems are given.