Effects of imperfect power control on a CDMA system operating over a low Earth orbiting satellite link

Proceedings of MILCOM '93 - IEEE Military Communications Conference Pub Date : 1993-10-11 DOI:10.1109/MILCOM.1993.408676

B. Vojcic, R. Pickholtz, L. Milstein

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引用次数: 1

Abstract

The analysis of both performance and capacity of direct sequence CDMA in terrestrial cellular systems has been addressed in the technical literature. It has been suggested that CDMA be used as a multiple access method for satellite systems as well, in particular for multi-spot beam Low Earth Orbit Satellites (LEOS). One is tempted to argue that since CDMA works well on terrestrial links, it will nominally work as well on satellite links. However, because there are fundamental differences in the characteristics of the two channels, such as larger time delays from the mobile to the base station and smaller multipath delay spreads on the satellite channels, the performance of CDMA on satellite links cannot always be predicted accurately from its performance on terrestrial channels. In this paper, the authors analytically derive the performance of a CDMA system which operates over a low Earth orbiting satellite channel. They incorporate such effects as imperfect power control and dual order diversity to obtain the average probability of error of a single user.<>

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低地球轨道卫星链路上运行的CDMA系统不完全功率控制的影响

技术文献对地面蜂窝系统中直接序列CDMA的性能和容量进行了分析。有人建议将CDMA作为卫星系统的多址接入方式，特别是用于多点波束低地球轨道卫星(LEOS)。有人可能会争辩说，既然CDMA在地面链路上工作得很好，它在名义上也会在卫星链路上工作得很好。然而，由于两种信道的特性存在根本的差异，例如从移动到基站的时间延迟较大，而卫星信道上的多径延迟传播较小，因此卫星链路上CDMA的性能并不能总是通过其在地面信道上的性能来准确预测。本文分析了在近地轨道卫星信道上运行的CDMA系统的性能。他们结合了不完全功率控制和双阶分集等效应来获得单个用户的平均误差概率。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Proceedings of MILCOM '93 - IEEE Military Communications Conference

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