基于双稳阱内随机共振的OFDM信号检测方法研究

doi:10.16182/j.issn1004731x.joss.21-0368

系统仿真学报 ›› 2022, Vol. 34 ›› Issue (09): 2046-2055.doi: 10.16182/j.issn1004731x.joss.21-0368

基于双稳阱内随机共振的OFDM信号检测方法研究

刘高辉(), 梁颖

西安理工大学　自动化与信息工程学院，陕西　西安　710048

收稿日期:2021-05-10 修回日期:2021-06-28 出版日期:2022-09-18 发布日期:2022-09-23
作者简介:刘高辉（1968-），男，博士，教授，研究方向为通信信号处理。E-mail：liugh68@xaut.edu.cn
基金资助:
国家自然科学基金(61671375)

Research on OFDM Signal Detection Method Based on Intrawell Stochastic Resonance of Bistable System

Gaohui Liu(), Ying Liang

Faculty of Automation and Information Engineering, Xi'an University of Technology, xi’an 710048, China

Received:2021-05-10 Revised:2021-06-28 Online:2022-09-18 Published:2022-09-23

摘要/Abstract

摘要：

为了解决OFDM(orthogonal frequency division multiplexing)传输系统中接收端对微弱OFDM信号的检测问题，本文将双稳阱内随机共振系统与OFDM信号增强和解调过程相结合，推导了多载波信号激励下双稳阱内随机共振系统从零状态变化到势阱状态所需时间的解析表达式，分析了暂态响应导致的多载波信号在一个符号内的能量损失问题；推导了系统稳态输出方程，分析了稳态过程对子载波已调信号叠加直流偏置分量的问题；探讨了在不同系统参数和噪声强度下阱内随机共振对OFDM信号解调性能的影响。仿真结果表明：该方法可有效实现信号与噪声阱内协同作用，提高OFDM信号的检测性能。

关键词: 阱内随机共振, 非线性检测, 暂态响应, 微弱OFDM信号

Abstract:

In order to solve the problem of weak OFDM (orthogonal frequency division multiplexing)signal detection at the receiver in OFDM transmission system, the intrawell stochastic resonance of bistable system is combined with the OFDM signal enhancement and demodulation process. Analytical expression is derived for the time required to change from zero state to potential well state for the intrawell stochastic resonance system under the excitation of multicarrier signals, and the energy loss of multicarrier signals in one symbol caused by the transient response is analyzed. The steady-state output equation of system is derived, and the problem of superimposing the DC bias component to the modulated subcarrier signal in the steady-state process is analyzed. The influence of intrawell stochastic resonance on the demodulation performance of OFDM signal under different system parameters and noise intensity is discussed. Simulation results show that the proposed method can effectively realize the synergy between signal and noise, which improves detection performance of OFDM signal.

Key words: Intrawell stochastic resonance, nonlinear detection, transient response, weak OFDM(orthogonal frequency division multiplexing) signal

中图分类号:

TP391

刘高辉, 梁颖. 基于双稳阱内随机共振的OFDM信号检测方法研究[J]. 系统仿真学报, 2022, 34(09): 2046-2055.

Gaohui Liu, Ying Liang. Research on OFDM Signal Detection Method Based on Intrawell Stochastic Resonance of Bistable System[J]. Journal of System Simulation, 2022, 34(09): 2046-2055.

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基于双稳阱内随机共振的OFDM信号检测方法研究

Research on OFDM Signal Detection Method Based on Intrawell Stochastic Resonance of Bistable System

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