双阈值二元阵列信道中的随机共振特性研究

Study on stochastic resonance characteristic in double threshold binary array channel

构建了双阈值2进制阵列信道,以输入输出互信息为指标,研究了不同噪声背景下,阵列信道中的随机共振现象。理论推导和数字仿真表明,在高斯噪声、瑞利噪声、单指数噪声、卡方噪声4种分布下,调节合适的输入噪声强度,则输入信号、阵列信道、噪声三者之间达到匹配,产生随机共振,并且随着阵列信道数目的增加,共振效果更加明显。最后分析了不同噪声背景下信道的误码率,通过调节噪声强度,误码率可达到最小值。

A dual threshold binary array channel is constructed, and stochastic resonance phenomenon in array chan- nel under different noise background is studied with the input output mutual information as an index. Theoretical deri- vation and numerical simulation show that under the four distributions of Gauss noise, Rayleigh noise, exponential noise and chi-square noise, through adjusting adequate input noise intensity, the input signal, array channel and noise reach matching and stochastic resonance is generated. And as the number of array channels increases, the resonance effect is more obvious. Finally the bit error rate under different noise background is analyzed. The bit error rate can reach the minimum value by adjusting the noise intensity.