【摘要】 本文提出一种多用户条件下直序列扩频CDMA(DSSS/CDMA)系统用户特征码的快速盲分离算法,该算法利用DSSS/CDMA系统独有的多用户信息混合后相位重复特性,在已估计出其他参数前提下,采用基带接收,利用分段后用户相位信息不断重复的特性,采取同相相加反相相减,无关项舍弃的简单操作,实现多用户特征序列的快速分离。该方法较ICA算法有更少的计算量,保留了信道内多用户的幅值特征,且不存在收敛问题。最后,给出了完整实验系统的计算机仿真结果。更多还原

【Abstract】 A blind separation algorithm of direct sequence code division multiple access(DSSS/CDMA) signal with unknown spreading codes is discussed in this paper.The reappearance of mixing users’phase information is utilized to separate the users’PN sequence by the simply plus and subtract operation in low SNR.The proposed method is different from ICA that not only save the users’s amplitude information but also calculation complication be independent of chip lenth L.The implement condition of the algorithm is analyzed and the performance of parameter estimation is measured by computer simulation.更多还原