The Research And Application Of Stochastic Resonance System Based On Optimum Matched Array

In the research of modern communication system and related equipment,various noises make a deviation between received signal and transmitted signal.However,in some nonlinear systems,the input signal and noise show a cooperative effect in the output,which is called as "stochastic resonance(SR)".The noise which interferes with signal transmission become the catalyst of signal in stochastic resonance.Making full use of the characteristics that unordered noise energy transfer to orderly signal energy can effectively improve the reliability of modern communication systems.Based on the classical bistable stochastic resonance system,combined with the best matching theory and array method,this paper studies the stochastic resonance phenomenon and its application on weak periodic signal and aperiodic signal transmission.The main contents are as follows:Firstly,based on the single bistable system of periodic signal,the optimal matching array bistable system is obtained by introducing best matching theory and parallel array method.The influences of array number signal frequency and noise intensity on the stochastic resonance are analyzed by using the optimal signal-to-noise ratio(SNR)gain.It is found that the optimal SNR gain of array system has a numerical upper bound.Secondly,the optimal matching array bistable system is introduced into aperiodic digital signal,and the bistable normalized scale change method is used to realize enhancement detection of large parameter aperiodic digital signal.Moreover,array bistable system can effectively reduce the bit error rate(BER)of communication system,the optimal BER can be obtained by using the best matching theory.The influences of array number,symbol rate and noise intensity on the stochastic resonance are analyzed.Without considering intersymbol interference(ISI),it is found that the symbol rate has no effect on the optimal BER.And the optimal BER can be made zero by increasing the number of arrays.Finally,the application of optimal matching array bistable system in ASCII code transmission is studied.By constructing the coding,transmission and decoding of English text,this chapter analyse the impact of number of arrays and noise intensity on the errors of ASCII decoding results.It is found that the BER can be reduced by increasing the number of arrays,and the quality of text can be improved.