Performance improvement in DS-spread spectrum CDMA systems using a pre- and a post-RAKE

A. Barreto, G. Fettweis
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引用次数: 36

Abstract

Mobile communications systems based on code division multiple access (CDMA) and direct sequence spread spectrum techniques have been gaining a lot of ground lately. The RAKE receiver is a well known technique in spread spectrum systems, which is used to obtain signal diversity in multipath environments. In TDD systems, a technique known as pre-RAKE has been proposed recently, in which the signal processing is transferred to the transmitter, and it has been shown that this technique provides a capacity increase in the downlink. In this paper we propose a combination of both methods and show that a substantial performance improvement can be reached this way.
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利用前耙和后耙改进ds扩频CDMA系统的性能
基于码分多址(CDMA)和直接序列扩频技术的移动通信系统近年来获得了很大的发展。RAKE接收机是扩频系统中一种众所周知的技术,用于在多径环境中获得信号分集。在TDD系统中,最近提出了一种称为预rake的技术,其中信号处理被转移到发射机,并且已经证明该技术提供了下行链路的容量增加。在本文中,我们提出了两种方法的结合,并表明可以通过这种方式实现实质性的性能改进。
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