利用CATV网络进行数字信息传送所面临的最主要问题是CATV网络信源多、频道密,特别是在同轴网络中存在严重的上行噪声漏斗效应,使上行频段集有大量脉冲噪声、窄带干扰、宽带高斯噪声、失调和非线性损伤,从而导致数据信号传输非常困难。国内外对有线电视网络的降噪基本都是采用HFC(光纤与同轴电缆混合网络)方案,通过增加光节点数,减少同轴电缆 CATV network for digital information transmission is the most important issue facing the CATV network source more dense channels, especially in the coaxial network there is a serious uplink noise funnel effect, so that the uplink band set a lot of impulse noise, narrowband interference, Wideband Gaussian noise, offset and non-linear impairments, resulting in very difficult data signal transmission. At home and abroad, the noise reduction of CATV network is based on the HFC (hybrid optical fiber and coaxial cable) scheme. By reducing the number of optical nodes and reducing the number of coaxial cables