Bound on mutual information for DS-CDMA spreading over independent fading channels

Conference Record of the Thirty-First Asilomar Conference on Signals, Systems and Computers (Cat. No.97CB36136) Pub Date : 1997-11-02 DOI:10.1109/ACSSC.1997.680053

M. Médard

引用次数: 8

Abstract

We consider using DS-CDMA over channels which decorrelate in frequency. We allow the bandwidth to increase while maintaining a fixed total average power. The bandwidth over which we transmit is divided into several slices, each of which has its own spreading sequence. We show that for a large bandwidth DS-CDMA spreading is not advantageous when the channel truly decorrelates in frequency or when the channel bandwidth slices are correlated but not jointly estimated.

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DS-CDMA在独立衰落信道上传播的互信息绑定

我们考虑在频率不相关的信道上使用DS-CDMA。我们允许带宽增加，同时保持固定的总平均功率。我们传输的带宽被分成几个片段，每个片段都有自己的扩展序列。我们表明，对于大带宽的DS-CDMA，当信道在频率上真正去相关或信道带宽片相关但没有共同估计时，扩频是不利的。

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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Conference Record of the Thirty-First Asilomar Conference on Signals, Systems and Computers (Cat. No.97CB36136)

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