作者：Linlin; Liang; Nina; Zhang; Haiyan; Hu...pulseamplitudemodulatedsignaldetectionlowsnrsymbolerrorbistablestochastic
摘要：To boost the performance of 4-ary pulse amplitude modulated(PAM)at low signal-to-noise ratio(SNR),bistable stochastic resonance(BSR)system is introduced into digital communications system and get a reliable signal detection scheme.In this paper,we first analyse BSR system for different amplitudes of 4-ary PAM signals.The steadystate of the bistable system will be statistically distinct,and the feasibility of the proposed detection scheme is confirmed.On this basis,we present a detailed study on steady-state transitions of the BSR system,and an explicit expression of the bistable system parameters is derived.By setting the bistable system parameters,bistable system,4-ary PAM signal,and noise reach the resonance state,and the BSR-based detection scheme is implemented.Moreover,we derive an analytical expression to calculate the symbol error rate(SER)of 4-ary PAM signals with the BSR-based detection under additive white Gaussian noise(AWGN).Finally,the simulation results validate that BSR-based detection scheme can improve the detection performance while efficiently reducing the symbol error rate.
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