一种根据扰码特性来提高多径搜索性能的算法

An algorithm improving multipath search performance based on scrambling codes characteristic

在CDMA系统中,为了对抗多径衰落,使用Rake接收机对接收信号进行处理。在发射端,通过扰码对信号进行加扰处理。Rake接收机对接收的信号进行解扰,相干积分处理,根据功率时延函数PDP值来计算多径的相位信息。在信噪比比较差的情况下,搜索出来的多径可能是噪声径,这对Rake接收机解调的性能有一定的影响。介绍一种根据扰码自相关特性,来判断搜索出多径是否为噪声径的方法,提高Rake接收机的性能。

In the CDMA system, Rake receiver is used to process the receiving signal for antimultipath fading. Channelized codes and scrambled cedes are added to the original singal before transmitting. The receiving data is descrambled and coherently integrated by the Rake receiver. Based on the power delay profile, the phase information is detemined. When signal to interference ratio is quite low, the process of path search may lead to noise fingers, which has bad effects on the demodulation performance of Rake receiver. In this paper, an improved method of path search based on the characteristic of scrambled codes is used to improve the performance of Rake receiver.