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Cramer-Rao界及其在DS-UWB同步问题中的应用

DOI: 10.13190/jbupt.200705.28.chenj, PP. 28-32

Keywords: 同步,直接序列扩频-超宽带,Cramer-Rao界,IEEE标准UWB信道模型

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Abstract:

在充分考虑了IEEE定义的UWB多径信道模型以及由此产生的多径干扰的基础上,推导出一种适用于DS-UWB通信系统中数据有助(DA)和数据无助(NDA)方式下同步捕获的理论界限--修正的Cramer-Rao界。通过与基于滑动相关捕获算法的DS-UWB捕获性能的比较,证明了该理论推导结果的有效性,并得出了系统的捕获性能会随着多径时延的增加而急剧下降的结论。

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