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低轨卫星CDMA突发通信的信号检测与捕获分析以及基于FPGA的实现
引用本文:管云峰,张朝阳,仇佩亮.低轨卫星CDMA突发通信的信号检测与捕获分析以及基于FPGA的实现[J].电路与系统学报,2003,8(1):21-26.
作者姓名:管云峰  张朝阳  仇佩亮
作者单位:浙江大学,信息与通信工程研究所,浙江,杭州310027
基金项目:国家自然科学基金资助项目(60002003),教育部青年骨干教师资助计划项目
摘    要:CDMA作为一种抗噪声强、带宽分配灵活,保密性强的传输接入方式被广泛的应用于民用、军用低轨卫星通信系统中,而信号的捕获和同步分析对于设计一个可实现的低轨卫星CDMA接收机是至关重要的,在低轨卫星信道上的CDMA传输必须着重考虑以下两点;低轨卫星信道上的衰落以及相对较大的多普勒频移。本文针对低轨卫星信道特征,着重分析了在此信道上的信号检测(Signal Detection),初始的码捕获(Code Acquisition),载波捕获(Carrier Acquistion)方法以及性能,并给出了基于FPGA实现的方案。

关 键 词:CDMA  码分多址  低轨卫星系统  信号检测  FPGA  移动通信  信号捕获策略
文章编号:1007-0249(2003)01-0021-06
修稿时间:2002年3月13日

Signal Detection and Acquisition in CDMA LEO Satellite Communication System with its FPGA Implementation
GUAN Yun-feng,ZHANG Zhao-yang,QIU Pei-liang.Signal Detection and Acquisition in CDMA LEO Satellite Communication System with its FPGA Implementation[J].Journal of Circuits and Systems,2003,8(1):21-26.
Authors:GUAN Yun-feng  ZHANG Zhao-yang  QIU Pei-liang
Abstract:CDMA technology is widely used in LEO satellites communication because of many merits offered by CDMA system such as suppression of ingress noise, flexibility of bandwidth assignment and the security. The key issue of the practical burst mode DS-CDMA-QPSK receiver is signal detection and acquisition. There are two key problems, fast fading and the large Doppler frequency offset, in satellite channel have to be considered. In this paper, emphasis is put on the schemes and the performance of the initial signal recognition, code acquisition and Doppler frequency acquisition based on the characteristics of satellite channel. The FPGA implementation of the proposed method is also provided.
Keywords:CDMA  LED System  Signal Acquisition  FPGA
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