关于电视群信号对光纤副载波调频传输中的信噪比平衡问题的分析

The Balance Analysis of Signal-to-Noise Ratio for FM-SCM Fiber Transmission Using TV Group Modulation

本文对微波副载波用电视群信号调频的光纤传输中的信噪比平衡问题进行了分析,推导出VSB-AM信号在解调后的信噪比表达式,引入了信噪比恶化系数的概念.为了实现多路VSB-AM信号间的信噪比的平衡,相应的微波副载波频偏应有确定的比例关系.

In this paper the balance of signal -to-noise ratio(S/N)between the group signals in FM-SCM systems is analysed. The formula of S/N for VSB-AM signals are derived . The concept of degradation coefficient of S/N is introduced. In order to realize the balance of S/N between VSB-AM signals in FM-SCM systems, definite proportional relationships should exist between the subcarrier frequency deviations produced by corresponding VSB-AM signals.