BPSK系统对信号载波频率的敏感特性分析  

Susceptible Characteristics of Signal-carrier Frequency on BPSK System

作　　者：贾锐 焦斌 赵琳锋 

机构地区：[1]中国洛阳电子装备试验中心,河南洛阳471003

出　　处：《无线电工程》2018年第1期17-21,共5页Radio Engineering

基　　金：国家自然科学基金资助项目(51277180)

摘　　要：为研究标准BPSK系统对信号载波频率的敏感特性,讨论了当干扰信号的码速小于或等于期望信号的码速时的情况,以及当2个信号的中心频率相同或不同时,频率偏移对误码率的影响。采用数学建模的方法构建期望信号、干扰信号和噪声模型,得出误码条件概率函数,并基于此,研究信号频率偏移量对标准BPSK接收系统的敏感特性。结果表明,当干信比相同时,在相同的频率偏移下,干扰信号的码速越高,其干扰效果越好;在相同干信比下,接收系统的误码率随着频率偏移量的增大而呈现减小的趋势,且其减小的程度呈现周期性的震荡,震荡的周期仅与期望信号的码速有关;在连续波干扰信号频率偏移量周期变化处,不同码速干扰信号的干扰效果相同。In order to research the sensitive characteristic of BPSK system to interference signal. The interference signal with a code rate no more than the expected signal’s code rate,and the influence of frequency deviation on BER （Bit Error Rate） at the equal or different center frequency was investigated in this paper. The noise models of expected signal and interference signal were established to research the sensitive characteristics of interference signal. The results show that with higher code rate,more obvious interference effect can be observed at the same SIR （ Signal to Interference Ratio） and frequency deviation. And the BER of receive system would decrease along with the frequency deviation increased at the equal SIR. The decreased level showed cyclical oscillation which cycle was only related to code rate of expected signal. And different code rates have the same interference effect at a periodical frequency deviation.

关 键 词：二进制相移键控系统 敏感特性 误码率 码速 频率偏移量 干信比 

分 类 号：TN911.4[电子电信—通信与信息系统]