HFC上行通路的噪声类型与抑制方法

The Noise Sorts and the Suppression Methods on the Upstream Channel in HFC

HFC上行通路汇集了大量的各类噪声 ,严重影响着其双向业务的开通 ,如何对这些噪声进行抑制是个难题。文中在分析了 HFC回传通道中的各种噪声类型、抑制的方法以及几种多用户接入技术的基础上 ,提出了适合我国的 S— CDMA回传系统 ,并采用了一种非线性滤波方法对其进行改造 ,给出了滤波器结构及其简单性能分析 ,达到了一定的抗噪声性能和增加了系统的容量。

Alot of noises accumulate on the upstream channel in HFC (Hybrid Fiber-Coax)system ,which caused the difficulty in bi directional operations, Therefore,suppressing them is very difficult. The paper analyzed the sorts of noises ,the methods of suppressing and several mutil user access techniques on the upstream channel in HFC system, and put forward the asynchronous CDMA system which is practical in our country, Meanwhile,the paper the nolinear filter method to modify those techniques. The filter structure is presented and its performance is analyzed simply, which increased the ability of resistance the noise and the capacity of the upstream channel.