Performance analysis of an improved SDMA technique based on CDMA

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 downlink 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.