CDMA系统中基于阵列波束设计的干扰抑制技术  

Interference Suppressing Technology Based on Beam Designing at CDMA

作　　者：赵建平[1] 吴伟陵[1] 

机构地区：[1]北京邮电大学信息工程系

出　　处：《北京邮电大学学报》1998年第A00期51-57,共7页Journal of Beijing University of Posts and Telecommunications

基　　金：国家自然科学基金

摘　　要：首先给出了适合于ＣＤＭＡ系统阵列天线的信号模型，然后分析了在最小均方误差准则下的波束模式，并得出用固定的低旁瓣波束逼近的合理性和局限性，基于上述考虑，将完全自动寻优的实现方法用波束设计加信号来向判断的部分自适应方法来代替，这样就降低了实现的复杂性．为了对信号来向进行判断，可考虑采用固定波束切换和利用Ｒａｋｅ接收机的输出进行相邻波束比较的方法进行用户跟踪．这样做的好处是由于有用户来向的信息，在ＦＤＤ方式下也可以做到下行链路进行方向性发射，改善了下行链路的性能．Firstly the signal model for W CDMA is presented, and then the beam mode at MMSE criteria and the rationality and limit when fixed low lobe beams are used as approximation of Winer results. The partial adaptive algorithm used beam designing and DOA finding are put forward. The beam switching and comparing between the neighbor beams are applied to find the Direction Of Arriving(DOA) of waves. The benefit of this algorithm is the transmitting directionally at base stations can be reached, and the capability of forward link can be greatly improved.

关 键 词：阵列天线 波束设计 波达方向 CDMA 蜂窝移动通信 

分 类 号：TN929.5[电子电信—通信与信息系统] TN821[电子电信—信息与通信工程]