摘要
基于互信息讨论了四种典型噪声下多阈值系统中的随机谐振现象。当输入信号在阈上时,互信息随着噪声的增强而单调递减,噪声总是恶化系统的性能;而当输入信号在阈下时,互信息随着噪声的增强先递增然后再递减,适量噪声能改善多阈值系统的性能,随机谐振现象存在。随着阈值系统阈值的增大,随机谐振功效降低,最佳噪声强度逐渐增大。文中结果说明了多阈值系统中基于互信息的随机谐振现象存在,且随机谐振对噪声具有一定的鲁棒性,拓广了随机谐振在多元信号与信息处理中的应用。
Based on mutual information,a study is made on stochastic resonance of the multi-dimensional signal in multi-threshold systems,under four representative noises.When the input signal is supra-threshold,mutual information monotonically decrease as the noise intensity increases,the performance of multi-threshold systems is always deteriorated by noise.However,when the input signal is sub-threshold,mutual information first increase and then decline as the noise intensity increases,appropriate amount of noise can improve the performance,resulting in stochastic resonance.The efficacy of SR decreases and the optimal noise becomes large as the threshold increases.These results indicate that stochastic resonance may exist in multi-threshold systems and are of certain robustness for noises.The application of stochastic resonance will be extended in multidimensional signal and information processing.
出处
《计算机技术与发展》
2010年第6期89-92,共4页
Computer Technology and Development
基金
江苏省自然科学基金(08KJB510012)
江苏省青蓝工程项目(TJ207010)
关键词
多阈值系统
随机谐振
互信息
multi-threshold system
stochastic resonance
mutual information
