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利用随机共振在强噪声下提取信息信号
引用本文:祝恒江,李蓉,温孝东.利用随机共振在强噪声下提取信息信号[J].物理学报,2003,52(10):2404-2408.
作者姓名:祝恒江  李蓉  温孝东
作者单位:(1)北京师范大学物理系,北京 100875; (2)新疆师范大学数理信息学院,乌鲁木齐 830054
基金项目:国家自然科学基金(批准号:10175010)资助的课题.
摘    要:已有利用随机共振在强噪声下提取单一频率信号的若干报道,但单一频率信号所携带的信息量为零.本实验研究表明:在调幅波和白噪声的协同作用下,非线性双稳系统的输出不仅可以呈现随机共振现象,而且经检波、滤波后能提取出调制信号(信息信号);与直接经电子学系统检波、线性滤波后所提取的调制信号相比,前者所获调制信号的信噪比更高.给出了绝热近似条件下,调制信号信噪比的解析表达式. 关键词: 随机共振 信噪比 调制信号 噪声

关 键 词:随机共振  信噪比  调制信号  噪声
文章编号:1000-3290/2003/52(10)/2404-05
收稿时间:2003-03-19
修稿时间:2003年3月19日

Extracting information signal under noise by stochastic resonance
Zhu Heng-Jiang,Li Rong and Wen Xiao-Dong.Extracting information signal under noise by stochastic resonance[J].Acta Physica Sinica,2003,52(10):2404-2408.
Authors:Zhu Heng-Jiang  Li Rong and Wen Xiao-Dong
Abstract:There are many reports on extracting the single frequency signal under noise by the stochastic resonance, but in which the information that the signal carries is zero. The experimental investigation in this paper manifests, when it is driven by an amplitude modulation wave and white noise, not only that the output of nonlinear bistable system exhibits the stochastic resonance phenomenon, but also that the modulation signal (information signal) can be extracted from the output by detecting and filtering. As compared with that from the electronics system by detecting and filtering direct the signal-to-noise(SNR) of modulation signal f rom the nonlinear bistable system is higher. Under the condition of adiabatic ap proximation the analytical formulation of the SNR of modulation signal is provid ed.
Keywords:stochastic  signal-to-noise  modulated signal  noise
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