移动通信中的CMA阵列抗干扰性能分析

Performance Analysis of CMA Adaptive Array in Reducing Interference in Mobile Communications

移动通信中的CMA阵列具有抗多径干扰和抗共信道干扰能力。本文理论分析了实际信号环境下CMA阵列的抗多径干扰和抗共道干扰能力 ,并进行了计算机仿真。仿真结果表明 ,CMA阵列的抗多径干扰性能受随机相移、信号幅度、信号空间分布等因素的影响。当所需信号与多径干扰信号空间隔离度越大 ,CMA阵列的抗多径干扰性能越好。CMA阵列的抗共信道干扰性能较抗多径干扰性能要好 ,只要所需用户信号和共信道干扰信号不在同一入射方向 ,CMA阵列就可以将干扰信号抑制掉。

CMA adaptive array has the capability to reduce multipath interference and cochannel interference (CCI). In this paper,the performance of CMA array in reduing multipath interference and CCI is analyzed,and computer simulations are also been carried out.The results of simulations show that the random phase shift,the amplitude and DOA(Direction of Arrival) of signals can influence performance of CMA array in reducing multipath interference.However,CMA array has a better performance in reducing CCI than that in reducing multipath interference.If the CCI signals are not in the same direction of desired signal,they can be reduced by CMA array.