WCDMA系统多径搜索中径间干扰的消除

Inter-path interference cancellation for multipath searching in WCDMA system

给出了一种新的适合WCDMA乃至扩频通信系统多径搜索时径间干扰的消除方案实际环境中,很可能出现两条径间距离较近的情况,而传统的多径搜索算法没有考虑由于成型滤波所造成的径与径之间的干扰,而这种干扰往往会导致搜索出来的多径位置与实际的多径位置有着不小的偏移,甚至会出现大的径掩盖掉小的径的情况。采用原有的径搜索算法不能获得满意的性能,会带来较高的虚警和较低的检测概率。针对此问题给出了一种径间干扰的抵消方法,在两径间隔很小时,它甚至可以还原出一个码片内的径通过分析及仿真可知,该方法具有很好的实用性。

A new scheme of muhipath interference cancellation is introduced for(WCDMA) DS/SS communications.The distance between two paths may very close in real environment.Since the old method doesnt considering IPI(Inter-path Interference) caused by pulse shape filter,this will cause offset with the real path location,even resuh in a phenomenon that a larger SIR path cover up a smaller one.As a result,the old algorithm can not provide satisfactory performance.It may give rise to too many false alarms or result in low detection probability.A multipath searching method based on inter-path interference cancellation is introduced.Analysis shows that this method has excellent practicability.