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upstream channel
    The Analysis of Noise Source of Upstream Channel in Broadband HFC Network
    宽带HFC网络回传通道噪声源的分析
    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.
    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。
    This article mainly introduces the methods of debugging and testing upstream channel when proceeding broadband connecting services.
    着重介绍在HFC双向网络中开展各种宽带接入服务时回传通道的调试、测试方法。
    It expounds new idea of transmission and debugging about HFC bilateral network upstream channel, to make the upstream channel work at the best state in a simple the effective way, so that the devices of the upstream channel can run stably and reliably.
    阐述了新的HFC双向网络回传通道的传输、调试理念 ,以简单而有效的方法使回传通道工作在最佳状态 ,从而使回传应用设备能稳定、可靠地工作
    The BER is main index in transmitting digital signal in upstream channel. To ensure BER value, the CNR value must be maintained. Gives the distributing features of noise source in upstream channel and introduces its computing method of C/N .
    回传通道的开发是实现双向对流业务的关键 ,回传通道传输数字信号 ,其主要指标是误码率BER ,欲保证BER值 ,就须保证一定的CNR ,论述回传通道主要噪声源的分布特点 ,介绍回传通道C/N的计算方法
    Introduced the designing aim,step and method of two-way HFC network upstream channel,elaborated the design and debugging idea of patterning two-way HFC network upstream channel,So that returning channel works in high point.
    介绍双向HFC网络上行通道的设计目标、步骤及方法 ,阐述模式化的双向HFC网上行通道的设计及调试理念 ,从而使回传通道工作在最佳状态。
 

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