随着数字电视业务和HFC双向业务的开展,对HFC网络中的数字信号的测量与分析就变得十分重要了,本文结合作者的体会针对数字信号测试中的几个参数进行了必要的理论分析,同时也结合实践针对各种星座图的图形,对产生这些现象的原因,进行了一定深度的实践探讨。 With the development of digital television service and HFC bidirectional service, the measurement and analysis of digital signals in HFC network become very important. This article combines the author’s experience to conduct the necessary theoretical analysis for several parameters in digital signal testing , But also with practice for the various constellation graphics, the reasons for the occurrence of these phenomena, a certain depth of practical discussion.