窄带信号加噪声的参数概率分布的物理意义与工程估算

The Physical Description and Engineering Evaluation of probability—Distribution of Parameters of Narrowband Signals with Noise

噪声是限制信息传输能力和高灵敏度检测性能的基本因素。实际信息传输系统通常都是窄带系统。本文从窄带信号加噪声的统计特性入手,对该类信号的包络分布给出了简明的物理解释;当信噪功率比 S^2》1,随机相位|θ|<7°时,其信号的相位分布可近似为正态分布,由此可得出计算相位分布的概率 P(|θ|<θ_0)的近似公式。经推算可知,计算误差<1%。

This paper briefly discusses the physical description of envelope probability- distribution of the narrowband signals with noise based on the statistical characteristics of the narrowband siguals with noise.The scope of application and relative accuracy for the for- mula of it's phase probability—distribution is described as well in the paper.