MC-CDMA中MMSE组合的研究

The 57th IEEE Semiannual Vehicular Technology Conference, 2003. VTC 2003-Spring. Pub Date : 2003-04-22 DOI:10.1109/VETECS.2003.1207567

I. Sato, T. Fujii

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引用次数: 6

摘要

在MC-CDMA系统中，基于MMSE准则的组合方法是减少多址干扰的方法之一。有两种情况的代码传播;在频域和时域。本文利用MMSE结合时域扩频技术对接收特性进行了分析。在慢衰落信道中，由于无法获得受码频扩展影响的时分集，在时域组合的MMSE不能有效地工作。为此，我们提出了一种码扩散方法，以最大限度地发挥MMSE的效果;该方法将扩频码的芯片在时域上进行空间分离，以减小接收电平波动的时间相关性，尽可能地获得时分集效果。结果表明，随着芯片之间的时间间隔变宽，该方法显著改善了慢速到快速衰落环境下的接收特性。

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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A study on MMSE combining for MC-CDMA

In MC-CDMA system, the combining method based on MMSE criterion is well known as one of the methods that reduce multiple access interference. There are two cases of code spreading; in frequency domain and in time domain. In this paper, we analyse the receiving characteristics using MMSE combining in time-domain code spreading. MMSE combining in time domain cannot work effectively in slow fading channels, because time diversity affected by code spreading cannot be obtained. So, we propose a code spreading method to maximally bring out the effect of MMSE; in this method chips of the spreading code are separated spatially in the time domain so as to reduce time correlation of received level fluctuation and obtain time diversity effect as much as possible. We clarified the proposed method dramatically improved receiving characteristics in slow-to-fast fading environments as time interval between chips is wider.

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来源期刊

The 57th IEEE Semiannual Vehicular Technology Conference, 2003. VTC 2003-Spring.

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