一种新的盲空时多用户检测器

A Novel Blind Space-Time Multiuser Detector

多用户检测是DS CDMA系统中的一项关键技术 ,而阵列天线也是一项减轻多用户干扰的方法 .许多现存的多用户检测器需要知道很多系统参数 ,并且其自适应实现需要发送训练序列 .在多径衰落信道下 ,这些参数是很难获得的 .本文提出了一种新的基于Kalman滤波的盲空时多用户检测器 (BSTKAL) ,这种多用户检测器不需要发送训练序列 .研究结果表明 ,检测器具有较强的抑制多址干扰和克服“远 近”效应的能力 ,并且能快速收敛 .

Multiple access interference(MAI) is a key problem in DS-CDMA.Both multiuser detection method and array antenna have been introduced to reduce the effect of MAI respectively.Many proposed multiuser detectors require system parameters and their adaptive versions require training sequences.These parameters are difficult to obtain in multipath fading channels.In this paper,a novel blind space-time multiuser detector based on the Kalman filter is proposed.With numerical simulations and performance analysis,it is shown that the detector precedes the conventional space-time 2-dimensional RAKE receiver and the space-time multiuser detector based on LMS in eliminating MAI and near-far resistance.Furthermore,it can converge rapidly.