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| Research on the Application of Stochastic Resonance in Tri-stable Wells in Weak OFDM Signal Detection |
| LIU Gao-hui,PENG Lei |
| School of Automation and Information Engineering, Xi’an University of Technology, Xi’an, Shaanxi 710048, China |
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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.
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Received: 21 July 2022
Published: 27 December 2023
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2023, Vol. 44 
