基于独立分量分析的DS-CDMA系统接收机

DS-CDMA System Receiver Based on Independent Component Analysis

传统检测器 (单用户匹配滤波 )利用扩频码之间的互相关特性来区分各用户信号 .而在实际应用中 ,信道噪声和近距离用户对远距离用户的强多址干扰即远近效应 ,使得接收机的性能受到很大影响 .本文将独立分量分析法引入传统接收机 ,有效控制接收信号的能量 ,从而极大地提高了接收机的抗远近性能 ,同时噪声的影响被尽可能消除 .仿真结果表明了该方法的有效性和可行性 .

Conventional detector (single-user matched filter)distinguishes each user by the crosscorrelation of their spread-spectrum codes.In practice,however,its performance is much deteriorated due to the existence of noise in channel and strong multi-access interference,i.e.near for effect.A new method using Independent Component Analysis is proposed in this paper.The-received energy of signals is controlled effectively,thus the near-far effect is overcome as much as possible;moreover,the effect that noise imposed on the detector is mostly reduced.Simulations verify the effectiveness of this method.