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

作　　者：刘高辉[1] 彭磊 LIU Gao-hui;PENG Lei(School of Automation and Information Engineering,Xi'an University of Technology,Xi'an,Shaanxi 710048,China)

机构地区：[1]西安理工大学自动化与信息工程学院,陕西西安710048

出　　处：《计量学报》2023年第12期1872-1881,共10页Acta Metrologica Sinica

基　　金：国家自然科学基金(61671375)。

摘　　要：提出了一种基于三稳阱内随机共振的微弱OFDM信号增强与解调方法,对OFDM基带复信号驱动下的三稳阱内随机共振系统的动力学特性和系统性能进行了深入分析。首先,分别给出了三稳阱内随机共振系统动态方程和OFDM基带复信号数学模型;然后,分析了三稳阱内随机共振的暂态响应过程和稳态响应过程,推导了系统从零状态到共振平衡状态所需暂态时间的表达式,推导了阱内随机共振系统处于稳定状态时的系统输出信号表达式;最后,给出了基于双三稳阱内随机共振系统的OFDM基带复信号增强和解调处理过程,先将接收到的OFDM基带复信号按符号周期进行分段,对同相分量和正交分量两路信号同时进行阱内随机共振处理,并进行了仿真。仿真结果表明:三稳随机共振方法有效解决了低信噪比下微弱OFDM信号接收性能恶化的问题,提高了OFDM系统的抗噪性能。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 

分 类 号：TB973[一般工业技术—计量学]