多径CDMA信道下基于指数加权最小二乘盲空时多用户检测

Blind space-time multiuser detection based on exponential weighting least-square in multipath CDMA channels

本文首先在码片匹配滤波的基础上为多径CDMA信道下的接收机提出四种数据选择方案,分析了各种数据方案对多址干扰与码间干扰的影响;接着提出了基于Rosen梯度投影实现的指数加权最小二乘盲空时多用户检测方法并分析了四种数据选择方案对其运算复杂度的影响;最后通过仿真实验结果表明:本文所提出盲空时多用户检测方法在运算量、收敛速度以及接收性能上具有一定的优势。

In this paper, We first present four data-selected schemes that are based on chip-matched filter for the multiuser receiver in multipath CDMA channels, and study the impact of these schemes on multiple-access interference (MAI) and inter-symbol interference (ISI). Then, we present the exponential weighting least-square (EWLS) blind space-time multiuser detection methods based on the Rosen抯 gradient projection, and analyze the effect of these schemes on the computational complexity of the presented detection method. Finally, the results of the simulations illustrate that the presented method has the advantages of lowering the computational complexity, accelerating the speed of convergence and improving the detection performance.