DS-CDMA卫星通信系统线性多用户检测算法性能比较

Performance Comparison of Multiuser Detection in DS-CDMA Satellite Mobile Communication System

CDMA是新一代移动通信系统的关键技术,现代卫星移动通信也采用CDMA技术。多址干扰(MAI)的存在严重影响了CDMA系统的性能,需要采用多用户检测技术进行抑制。本文分析了卫星移动通信系统的模型,将线性多用户检测算法用于卫星移动通信系统,并对传统检测器、解相关检测器、MMSE检测器等线性检测器进行了性能比较。计算机仿真结果表明采用线性多用户检测技术使卫星移动通信系统的性能得到了明显的改善。

CDMA is one of the key technologies in the next generation mobile communication system,as same as the modern satellite mobile communication system. The Multi - user Detection （MUD） is the most important anti - interference technology for CDMA system, for in the practical CDMA system most of the interference comes from Multi - access Interference （MAD. Several representative linear multiuser detectors are analyzed in this paper. The simulation and the performance comparison of the decorrelating detector, MMSE Detecter and conventional detector are also presented under the Gaussian channel. Simulation experiments show that the performance of satellite mobile communication system has improved evidently.