Research of the Noise Characteristic on the Upstream Channel for HFC Network
Currently there is a growing demand towards interactive multi-media services using high capacity Hybrid Fiber Coaxial (HFC) networks. With regards to the realization of upstream traffic, many problems occur with the accumulation of noise due to the tree and branch architecture of the coaxial access network We have figured out the typical network topology for the two-way HFC network and pointed out where the DS16lOs were set. From this figure, we can clear know the reason of noise accumulation and know where and how weve got the characteristic of the damage signaL Several types of typical noise and interference for the upstream channel in actual HFC network are given in tbis paper, with the help of a special equipment called DS1610. Several parameters of the noise, such as the types, causes, effect to the upstream, and the frequency of appearance and so on , which are given in form of spectrum or constellation, can be easily found in this paper. And it also gives the main characteristics of some typicat noise and interference, which can be very useful for further study of the noise and interference for the upstream channel in HFC network.
Upstream channeL noise accumulation noise analysis spectrum constellation
Li Zhang Yong-tao Ma Kai-hua Liu Yuan Zeng
School of Electronic Information Engineering, Tianjin University,Tianjin, China
国际会议
2010 2nd International Conference on Signal Processing System(2010年信号处理系统国际会议 ICSPS 2010)
大连
英文
1266-1270
2010-07-05（万方平台首次上网日期，不代表论文的发表时间）