基于随机共振的2PSK信号相干接收误码率的研究
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摘要
针对信道环境恶劣情况下的数字信号接收,提出了一种基于随机共振理论降低二进制相移键控信号相干接收误码率的新方法。通过与常规解调方法的对比仿真,发现基于随机共振非线性双稳系统解调的2PSK信号的误码率在低信噪比情况下有明显降低。特别是信噪比在-14.4 d B到-5.2 d B范围内时,误码率曲线下降很快,在-7.4 d B时较传统线性解调系统误码率可降低20.1%。
For the digital signal received in a poor channel environment, a new method based on stochastic resonance was proposed, which is used to reduce the bit error rate of 2PSK signal by coherent demodulation receiving. By contrast with the conventional demodulation method, it is found that the bit error rate of 2PSK signal based on stochastic resonance of nonlinear bistable system has significantly reduced under low SNR circumstances. In particular, when the input SNR is in the range of-14.4 d B to-5.2 d B, the bit error rate curve decreased rapidly. It can reduce 20.1% when the input SNR equals-7.4 dB.
For the digital signal received in a poor channel environment, a new method based on stochastic resonance was proposed, which is used to reduce the bit error rate of 2PSK signal by coherent demodulation receiving. By contrast with the conventional demodulation method, it is found that the bit error rate of 2PSK signal based on stochastic resonance of nonlinear bistable system has significantly reduced under low SNR circumstances. In particular, when the input SNR is in the range of-14.4 d B to-5.2 d B, the bit error rate curve decreased rapidly. It can reduce 20.1% when the input SNR equals-7.4 dB.
引文
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[2]HARI V N,ANAND G V,PREMKUMAR A B,et al.Stochastic resonance phenomenon in an underdamped bitable system driven by weak asymmetric dichotomous noise[J].Signal Processing,2012,92:1745–1757.
[3]李晶,侯思祖.OFDM误码率性能分析与研究[J].微计算机信息,2006,22(3):261–264.LI Jing,HOU Sizu.Analysis and study of performance of OFDM ber[J].Microcomputer Information,2006,22(3):261–264.
[4]孙红霞.采用最小似然bit同步的2PSK系统的性能分析[J].郑州大学学报(自然科学版),1991,23(2):63–65.SUN Hongxia.Performance analysis of 2PSK system using the minmiun linkelihood bit synchronization[J].Journal of Zhengzhou University,1991,23(2):63–65.
[5]黄雄军,岳恒立,唐向宏.小波调制在AWGN信道中性能分析[J].杭州电子科技大学学报,2005,25(5):34–36.HUANG Xiongjun,YUE Hengli,TANG Xianghong.Performance analysis for wavelet modulation in AWGN channels[J].Journal of Hangzhou Dianzi University,2005,25(5):34–36.
[6]庞存锁,韩焱.基于NRZI编码的数字通信系统仿真研究[J].微计算机信息,2007,23(5):288–289.PANG Cunsuo,HAN Yan.Digital communication system simulation research about NRZI encoded[J].Control&Automation,2007,23(5):288–289.
[7]ZOU H L,ZHENG L Q,LIU C J.Detecting parameters of high frequency signals with frequency modulation stochastic resonance[C].Image and Signal Processing(CISP),2013 6th International Congress on,2013,2:1090–1095.
[8]夏均忠,刘远宏,马宗坡,等.基于调制随机共振的微弱信号检测研究[J].振动与冲击,2012,31(3):132–135.XIA Junzhong,LIU Yuanhong,MA Zongpo,et al.Weak signal detection basing on modulated stochastic resonance[J].Journal of Vibration and Shock,2012,31(3):132–135.
[9]ZHANG G L,WANG F Z.Research of stochastic resonance in cascaded bistable system[J].Journal of Computational and Theoretical Nanoscience,2009,6(3):676–681.
[10]GAO Y X,WANG F Z.Adaptive cascaded bistable stochastic resonance system research and design[J].Journal of Computational and Theoretical Nanoscience,2013,10(2):318–322.
[11]RISKEN H.The Fokker-Planck equation[M].New York:Springer,1983:63–65.
[12]XU B H,DUAN F B,BAO R H,et al.Stochastic resonance with tuning system parameters:the application of bistable systems in signal processing[J].Chaos,Solitons&Fractals,2002,13(4):633–644.
[13]樊昌信,曹丽娜.通信原理[M].第六版.北京:国防工业出版社,2009:51.