CDMA通信系统仿真及抑制多址干扰的技术研究

Study on Simulation of CDMA Communication System and Anti-Multiple Access Interference Technique

CDMA作为第三代无线通信系统,具有频谱利用率高、保密性强、可多址复用等优点。在移动通信领域,越来越受到人们的普遍关注和重视。文章阐述了多址干扰产生的原因及其对系统性能的影响。通过MATLAB/Simulink建立仿真平台,设计并实现了直接序列扩频通信中信号的收发,采用误码率这一指标,重点对比分析传统单用户检测器、解相关线性检测器和最小均方误差检测器对系统性能的影响。实验结果表明,解相关线性多用户检测器在抑制多址干扰方面占有明显的优势。

As one of the most important multiple access of the third generation mobile system,with merits of high bandwidth efficiency;strong security;multiplexed accessed,etc.In the field of mobile communications,the CDMA technology has gotten more and more attention.Focusing on the problem of MAI,this paper discusses and studies the related solutions of MAI.By MATLAB/Simulink simulation platform established,designs and implementes the direct sequence spread spectrum communications signal sending and receiving.Using bit error rate,focusing on comparative analysis of traditional single user detector,decorrelating linear detector and MMSE detector influence on system performance,results show that using decorrelating linear multi-user detection system can achieve good performance.