超宽带Rake接收机结构的研究  

The study of Rake receiver structure for ultra wideband

作　　者：姚尚绩[1] 郑飞[1] 

机构地区：[1]桂林电子科技大学通信与信息工程系,广西桂林541004

出　　处：《电子技术应用》2008年第8期122-125,共4页Application of Electronic Technique

基　　金：国家自然科学基金项目(60372037)

摘　　要：超宽带信号在室内密集多径环境下会产生严重的时间弥散,信号的传输性能将会下降,Rake 接收是提高超宽带接收机性能的重要手段。然而如何确定接收机的叉指数目成为接收机设计过程中的关键问题。基于 IEEE802.15.3a 室内超宽带多径信道模型,采用二进制相移键控(BPSK)调制方式时,选用最大比合并(MRC)方式对 Rake 接收机的超宽带通信系统的性能进行了仿真。仿真得出了最佳的合并叉指数目,结果表明在最佳的合并叉指数目情况下的系统性能较其他叉指数目情况下的系统性能更为优越,验讧了选取此叉指数目的有效性。此方法大大有利于 Rake 接收机的设计。In indoor environments, ultra-wide band signals suffer from dense multipath propagation and severe time dispersion, the transmission performanee of signals will be dropped. Rake reeeption is an important way to boost the performanee of ultra-wide band reeeivers. But how to make sure the fingers of reeeiver becomes the key in the proeess of reeeiver design, based on the in- door muhipath ehannel model of the IEEE 802. 15. 3a, performance of Rake reeeiver in UWB eommunieation system under BPSK modulation using MRC is simulated. The optimum finger is obtained by eomputer simulation, it shows that it ean get better performance of system using the optimum finger than the others , it validates the validity by ehoosing the optimum finger. This method is more beneficial to the device of Rake receiver.

关 键 词：超宽带 信道模型 RAKE接收机 误码率 

分 类 号：TN929.533[电子电信—通信与信息系统] TN95[电子电信—信息与通信工程]