Stochastic Resonance Technology In MSK/DS Wireless Communication System With Low SNR

In the wireless communication system,Super Low Frequency(SLF)electromagnetic wave has many advantages,such as far propagation length,good invisibility,good stability and strong penetration.It plays an important role in resource exploration and earthquake monitoring.The symbol rate is relatively low and the influence of noise on electromagnetic wave is serious.Communication performance decreased significantly.When the noise is processed by the traditional filter,the useful signal is distorted.While the Stochastic Resonance(SR)technique is used to deal with the mixed signal,it can suppress the noise and enhance the useful signals.In this way,the quality of information transmission can be improved to a great extent,which lays the foundation for the data recovery process.Based on the background of Minimum Frequency Shift Keying / Direct Sequence Spread Spectrum(MSK/DS)communication system,improving the quality of communication system the information transfer is as a target,and the influence of stochastic resonance on the quality of information transmission in communication system is studied.MSK/DS wireless communication system with low signal to noise ratio based on stochastic resonance technology is designed.The quality of information transmission can been improved by stochastic resonance.Firstly,mathematical model of MSK/DS communication system is constructed,based on basic theory of wireless communication system and actual system requirements.System communication performance is simulated bySecondly,based on the basic theory of classical stochastic resonance,the effects of parameters of periodic signal and noise intensity on outputs of stochastic resonance are studied.The realization methods of stochastic resonance on large parameters is discussesed.The mathematical model of large parameteres stochastic resonance is established,and the Runge-Kutte numerical analysis method is used to solve the system outputs.Finally,the design of the receiver is redesigned by large parameteres stochastic resonances.Under the conditions of Gauss white noise,the quality of information transmission is improved by stochastic resonance technique of twice-sampling and structural parameteres optimization,and of the two the latter is better than the former.Under the conditions of Super Low Frequency noise,stochastic resonance technique is introduced on the basis of nonlinear filter.The quality of information transmission is improved by stochastic resonance technique of twice-sampling and structural parameteres optimization,and of the two the latter is better than the former.