基于随机共振的大频率信号相干接收误码率研究  

Study on the Bit Error Rate of Coherent Reception of High Frequency Signal Based on Stochastic Resonance

作　　者：张福佳[1] 江虹[1] 张秋云[1] 

机构地区：[1]西南科技大学信息工程学院,四川绵阳621010

出　　处：《自动化仪表》2017年第7期50-53,共4页Process Automation Instrumentation

摘　　要：针对信道环境恶劣条件下的大频率数字信号相干接收问题,提出了一种基于调参随机共振系统降低数字信号相干接收误码率(BER)的方法。从时域、频域及误码率三个方面对大频率二进制相移键控(BPSK)信号的随机共振相干接收方法进行了研究。首先,通过调整系数R改变非线性随机共振系统的参数a、b,将其共振频率提高R倍,从而实现大频率信号的随机共振,提高信号的信噪比(SNR);然后,对通过随机共振系统后的信号进行相干解调,并计算误码率。试验结果表明,与传统解调方法相比,该方法的误码率在低信噪比情况下有明显降低,当SNR=-14 d B时,较传统解调系统误码率可降低25.28%。随机共振系统提高了信号相干接收性能。随机共振理论在信号接收解调及信号处理等方面存在优势。Focusing on the coherent receiving issue of high frequency digital signals in poor channel environment,a new method based on stochastic resonance system to reduce the bit error rate（ BER） of the received signal is proposed. The stochastic resonance coherent reception method for BPSK signals with large frequency is studied from three aspects： time domain,frequency domain and the bit error rate. Firstly,to realize the stochastic resonance of the large frequency signal and improve the signal noise ratio（ SNR） of received signals,the resonance frequency is enhanced by R times through adjusting the coefficient R to change the parameters a and b of the nonlinear stochastic resonance system. And then,through demodulating the signal after dealing with the stochastic resonance system,the SNR is calculated. The test results show that comparing with the traditional demodulation system,the bit error rate has significantly reduced in a low SNR environment,and it can reduce 25. 28% when the input SNR equals-14 d B. The coherent reception performance is improved through the stochastic resonance system,and it shows that the stochastic resonance theory has potential advantages in signal reception demodulation and signal processing,etc.

关 键 词：随机共振 非线性系统 信噪比 相干解调 二进制相移键控 误码率 信号处理 

分 类 号：TH-3[机械工程] TP311[自动化与计算机技术—计算机软件与理论]