计量学报2023，Vol.44Issue(12)：1872-1881,10.DOI:10.3969/j.issn.1000-1158.2023.12.13
三稳阱内随机共振在微弱OFDM信号检测中的应用研究
Research on the Application of Stochastic Resonance in Tri-stable Wells in Weak OFDM Signal Detection
摘要
Abstract
A weak OFDM signal enhancement and demodulation method based on stochastic resonance in tri-stable wells is proposed,and the dynamic characteristics and system performance of stochastic resonance systems in tri-stable wells driven by OFDM baseband complex signals are deeply analyzed.Firstly,the dynamic equation of the stochastic resonance system in the tri-stable well and the mathematical model of the OFDM baseband complex signal are given respectively.Then,the transient response process and the steady-state response process of the stochastic resonance in the tri-stable well are analyzed,and the system from the zero state is deduced.The expression of the transient time required to reach the resonance equilibrium state,the expression of the system output signal when the stochastic resonance system in the trap is in a stable state is derived.In the process of signal enhancement and demodulation,the received OFDM baseband complex signal is firstly segmented according to the symbol period,and the in-phase component and quadrature component signals are simultaneously processed by in-well stochastic resonance,and the simulation is carried out.The simulation results show that the tri-stable stochastic resonance method effectively solves the problem of weak OFDM signal reception performance deterioration under low signal-to-noise ratio,and improves the anti-noise performance of the OFDM system.关键词
无线电计量/OFDM信号/阱内随机共振/三稳系统Key words
radio metrology/OFDM signal/intrawell stochastic resonance/tri-stable system分类
通用工业技术引用本文复制引用
刘高辉,彭磊..三稳阱内随机共振在微弱OFDM信号检测中的应用研究[J].计量学报,2023,44(12):1872-1881,10.基金项目
国家自然科学基金(61671375) （61671375）
