论文部分内容阅读
本文将讨论副载波调制AM/FM系统的噪声特性,并分别讨论输入信噪比高于以及低于门限值两种情况。最后与一般调频的噪声作一比较。引言:AM/FM系统为副载波调制的一种类型,副载波调制在无线控制及通讯中均得到一定的应用。副载波调制可以有FM/FM,PA/FM等形式,本文将只讨论AM/FM的情况。为讨论方便,分析将从一般宽带调频入手。
This article will discuss the noise characteristics of a subcarrier modulated AM / FM system and discuss two cases where the input signal to noise ratio is above and below the threshold, respectively. Finally, compared with the general FM noise. Introduction: The AM / FM system is a type of subcarrier modulation. Subcarrier modulation is used in wireless control and communication. Subcarrier modulation can be FM / FM, PA / FM and other forms, this article will only discuss the case of AM / FM. To facilitate the discussion, the analysis will start with the general broadband FM.