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di xin zao bi xia gan ying tong xin kuo pin xin hao de zai bo tong bu fang fa
Author(s): 
Pages: 29-32
Year: Issue:  4
Journal: Railway Signalling & Communication Engineering

Keyword:  低信噪比感应通信扩频载波同步判决反馈锁相环;
Abstract: 对低信噪比下感应通信扩频信号的载波同步方法进行研究.介绍感应通信的背景和感应式扩频通信系统的组成.提出在判决反馈锁相环(DFPLL)的基础上利用扩频信号扩频码的特点来显著降低噪声对载波相位差估计的影响,以达到低信噪比条件下载波可正常同步的目的.通过感应式扩频通信系统的仿真,给出多种仿真信道、不同频偏及不同信噪比下的仿真结果.仿真结果表明,该方法可显著提高低信噪比下感应式扩频通信系统的性能,且算法复杂度适中,有利于工程实施.
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