HFC网回传通道中的调制技术

Modulation in Return Path for HFC

由于ＨＦＣ（光缆同轴电缆混合）网采用了树形分支型结构，使来自用户端和电缆网的噪声汇聚，形成了回传（反向）通道中的噪声漏斗效应，需采用多址复用的调制方式。讨论了几种用于ＨＦＣ回传通道中的多址接入技术，比较了它们在各种干扰下的性能及容量。

The major problem afflicting return path spectrum in HFC network is the effect of noise funneling due to a tree and branch architecture, so particular modulation formats and multiple access techniques must be used. This paper discusses the capacities and performance of several modulation formats and multiple access techniques under the various of disturbances presented in the HFC return path.