同步DS-CDMA系统中的最优时空线性多用户检测器

Optimal Linear Space-Time Multiuser Detector for Synchronal DS-CDMA Systems

本文给出了一种通用的时空二维线性多用户检测方法 ,它将所有线性多用户检测器归结到一个统一的数学模型之下 .基于此模型 ,本文将时空线性多用户检测问题转化为一个权矢量的优化问题 ,并在线性约束最小方差(LCMV)准则下给出了权矢量的优化解 .对现有的几种典型的线性多用户检测器的分析表明 ,这些方法都可以看作是本文提出的通用时空二维线性多用户检测方法的特例 ,且只能在某种限定条件下得到局部最优解 ,其抑制多址干扰和噪声的能力都低于文中的最优时空线性多用户检测器 .最后 。

A versatile signal model suitable for linear space-time multiuser detectors is proposed. Based on the model, a versatile linear space-time multiuser detector is presented and its optimal solution according to the linear constrained minimum variance (LCMV) criterion is deduced. The analyses of existent linear multiuser detectors demonstrate that these methods are just the special cases of the versatile detector in this paper and can only achieve the suboptimal solution. Hence their interference canceling performance is inferior to the optimal detector in this paper. Finally, numerical simulations are presented.