基于分支定界算法的DS-CDMA UWB系统多用户检测技术研究

Study on multi-user detection techniques for DS-CDMA UWB system based on branch and bound algorithm

研究一种带预处理的检测器,利用预处理动态设定的门限值直接判决用户的比特数据信息,用以解决线性多用户检测器由于判决门限值固定而影响检测性能的问题;利用分支定界算法进行预处理可以得到全局最优解,将原有的多用户检测问题转变成较小规模的检测问题,以达到减少多址干扰、增加正确判决的概率以及降低系统检测误码率的目的.仿真实验结果表明:预处理后,系统检测正确判决的概率增大,误码率降低.

A kind of pre-processing of multi-user detection has been researched. Through the pre-processing, dynam-ic threshold is set to direct decide the user＇s data bit information so as to solve the problem that the linear multi-user detector＇s decision threshold which is fixed impact the detection performance. The global optimal solution is ob- tained through pre-processing by using the branch and bound algorithm, and then the original problem changes into smaller multi user detection problem, in order to reduce multiple access interference （MAI）, increase the probability of correct decision and reduce the bit error rate. The simulation experiment results show that after pre-processing the probability of correct decision has been increased, and the bit error rate has been reduced.