论文部分内容阅读
1.前言以高斯噪声作调制信号的 FM 信号的频谱分布及其占有频率带宽的问题,早在20年前就有人论述过。最近,有动向表明,人们已开始将陆地移动通信的频率间隔进一步窄带化,关于 IDC(瞬间偏移控制电路)特性的频谱扩展也在讨论。本报告根据文献[1]的方法,计算了以二、三个频谱分布的高斯噪声调制的 FM 信号的99％带宽;关于 IDC 的效果,在求带宽时,只考虑了功率饱和,是与实测值相比较好。
1. Introduction The spectral distribution of FM signals modulated with Gaussian noise and the bandwidth of their occupied frequency were discussed some 20 years ago. Recent developments have shown that people have begun to further narrow the frequency separation of land mobile communications and that the spectral spread of IDC (Instantaneous Offset Control Circuit) features is also under discussion. This report calculates the 99% bandwidth of an FM signal modulated by two or three spectral distributions of Gaussian noise according to the method in [1]. For the effect of IDC, only the power saturation is taken into consideration when calculating the bandwidth. Value is better.