摘要
为了提高输出输入信噪比增益,本文通过增加并联静态系统的数目研究了并联静态系统的输出输入信噪比增益问题,推导了并联静态系统输出输入信噪比增益的理论公式。研究结果表明,信噪比增益公式与输入弱信号无关,它取决于内外部噪声的强度及其概率密度函数。同时,对并联静态系统输出输入信噪比增益进行了实验研究,实验结果表明,在高斯白噪声和均匀分布白噪声的方差和均值都保持不变时,输出输入信噪比增益随着并联系统数目的增加而增大。该方法在强噪声背景下的弱信号处理领域有着广泛的应用前景。
In order to improve the output-input signal-to-noise ratio(SNR) gain, in this paper, we study the output-input SNR gain of a parallel array of static systems, and present a new formula of the output-in- put SNR gain for transmitting a weak signal. This formula is precisely determined by the noise probability density and also by the noise level, while the roles of internal and external noises are clearly elicited, respectively. Based on this formula, the simulation results show that the larger number of static systems are paralleling connected, the higher output-input SNR gain can be achieved. The present method has extensive application on detecting weak signals in heavy background noise.
出处
《青岛大学学报(工程技术版)》
CAS
2013年第3期37-41,共5页
Journal of Qingdao University(Engineering & Technology Edition)
基金
山东省自然科学基金项目资助(ZR2010FM006)
关键词
弱信号
信噪比增益
局部最优处理器
并联静态系统
signal-to-noise ratio gain
locally optimum processor
parallel array of static systems
weak signal