DS-CDMA中基于Walsh-Hadamard变换的并行频率和码采集

G. Jeong
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引用次数: 3

摘要

提出了一种适用于直接扩展(DS)-CDMA的并行频率和伪噪声(PN)码搜索器,并分析了其在多径瑞利衰落信道中的性能。该方法采用两步获取过程:在第一步PN搜索中,根据阈值并行测试多个频率假设的能量。当一个或多个频率假设通过测试时,搜索器接受PN假设并进入下一个频率搜索步骤,在该步骤中搜索器寻找最强的频率假设。该方法利用预先计算的相关矩阵从接收信号的沃尔什-阿达玛变换中提取频率信息。该方法的一个优点是利用了许多DS-CDMA接收机用于正交信道解码的快速WHT。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Parallel frequency and code acquisition based on Walsh-Hadamard transform in DS-CDMA
A parallel frequency and pseudo-noise (PN) code searcher for direct-spread (DS)-CDMA is proposed and its performance in multipath Rayleigh fading channels is analyzed. The proposed method uses a two-step acquisition procedure: in the first PN search step, energies in multiple frequency hypotheses are tested in parallel against a threshold. When one or more frequency hypotheses pass the test, the searcher accepts the PN hypothesis and enters the next frequency search step where the searcher looks for the strongest frequency hypothesis. The proposed method uses a pre-calculated correlation matrix to extract frequency information from the Walsh-Hadamard transform of a received signal. One advantage of this method is that it utilizes the fast WHT that is already used in many DS-CDMA receivers for decoding orthogonal channels.
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