HFC 网络上行信道噪声及其抑制分析

摘要

Because of the characteristics of HFC network structure,the tree structure can lead to the formation of noise funnel effect above the upstream channel.Therefore,how to control the noise of the HFC uplink chan-nel is very important for improving the quality of the uplink channel of HFC network.In this paper,the noise and the noise of the QPSK network are analyzed by the simulation of the Gauss noise and the narrowband con-tinuous wave noise in the HFC network.The characteristics of the noise and the noise suppression scheme of the HFC are analyzed.%根据 HFC 网络结构的特点，树状的网络结构会导致在上行信道上方形成噪声漏斗效应，因此控制 HFC 上行信道的噪声影响，对提高上行信道的质量有非常重要的作用。通过对 HFC 网络中 QPSK 系统受高斯噪声和窄带连续波噪声干扰的仿真，分析了 HFC 网络上行信道受噪声影响的特点和抑制噪声的方案。