一种基于码分多址的改进性空分多址性能分析

Performance analysis of an improved SDMA technique based on CDMA

为解决SDMA中下行波束交叠引入的不同波束覆盖下用户群间相互干扰,研究一种结合CDMA的改进性SDMA多址技术。基站对下行链路的赋形波束进行实时的相关性检测,为高相关性的SDMA波束动态分配正交的PN码,以CDMA方式来识别不同波束,实现码分和空分的有效结合。仿真结果表明改进的SDMA多址技术在波束高度相关,也即是用户群之间干扰较强的情况下仍能获得较好性能。

The overlap between beams often introduces interference among different user groups in the downlink of SDMA system. To resolve this problem, an improved SDMA technique combined with CDMA was studied. Base station made a real-time detection for the correlation of downliuk shaped beams, and dynamically allocated orthogonal PN code for higher correlated beams. This improved SDMA identified the different beams with CDMA method, and it implemented the combination of SDMA and CDMA availably. Simulation results show that the improved SDMA technique can achieve better performance in the case of high correlation between beams as well as strong interference among user groups.