多用户CDMA系统中Turbo-BLAST迭代检测算法

摘要

将V-BLAST结构和CDMA技术相结合,构造了多用户CDMA系统模型,提出了一种联合多用户检测和Turbo迭代思想的多用户检测算法.该方案首先利用解相关算法对接收信号进行空时多用户检测.以去除用户间干扰.然后再对期望用户的接收信号进行软干扰抵消迭代检测,以去除天线间干扰.解相关后数据检测仅和单个用户的天线数目有关,算法复杂度较低.仿真结果表明,构造的空时多用户模型可使各用户检测相对独立,有利于已有单用户Turbo-BLAST方案的应用.%A multi-user CDMA system is constructed based on V-BLAST structure and CDMA technique,and a space-time multi-user detection algorithm for multi-user Turbo-BLAST system is proposed based on the multi-user detection algorithm and Turbo-BLAST scheme.The proposed de-correlation algorithm is used to remove the interference among multi-users,and then the modified iterative interference cancellation scheme is used for the expectation user to remove the interference among antennas.The complexity of the detection algorithm after decorrelation only correlated with antennas numbers of the expectation user.Simulation results show that the proposed space-time multi-user model is effective and makes the detection of every user be comparatively independent.Thus it is beneficial to the application of the single-user Turbo-BLAST scheme.