DS-CDMA系统的串行捕获技术
首发时间:2008-09-18
摘要:同步技术是任何通信系统的关键技术,在DS-CDMA(Direct Sequence Spread Spectrum- Code Division Multiple Access)这样的扩频通信系统中尤为重要。如果不能准确的同步,接收数据将是一片噪声。DS-CDMA系统的同步技术主要包括伪随机序列的捕获、跟踪、帧同步和载波同步等,其中的伪随机序列的捕获是进行其它同步的前提,也是有效接收信息数据处理的基础。本文首先描述了DS-CDMA系统的结构,然后概述了DS-CDMA系统的捕获技术,并着重分析了串行捕获技术中的单驻留串行相关捕获技术,多重驻留串行相关捕获技术,多径情况非连续搜索捕获技术。衡量捕获性能的三个指标是:平均捕获时间、检测概率和虚警概率。本文对上述几种串行捕获技术的这三个指标做了简要的分析。
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Serial Acquisition in DS-CDMA Systems
Abstract:Synchronization is a key technique of any communication system, especially in DS-CDMA(Direct Sequence Spread Spectrum-Code Division Multiple Access)system. The receive data will be totally noise if synchronization is lost. Synchronization technique in DS-CDMA system includes PN code acquisition, tracking, frame synchronization and carrier synchronization. PN code acquisition is the base of other synchronization processing. In this paper, we first describe DS-CDMA system, then summarize acquisition technique in DS-CDMA system, finally analyze several serial acquisition techniques in common use which are single-dwell serial acquisition, multi-dwell serial acquisition and non-continual acquisition in multi-path channel. There are 3 criterions to evaluate acquisition performance: average acquisition time, detection possibility and false possibility. This paper also analyzes the criterions for the acquisition techniques mentioned above.
Keywords: DS-CDMA serial acquisition realization
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No.2415530400512217****
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