在HFC网络中上行信道传输方式的探讨

HFC网络中上行信道的漏斗噪声是制约上行信道提高传输速率的主要原因，论文首先探讨了宽带业务对上行信道的要求，以此作为比较上行信道的传输方式优劣的标准，然后，对DOCSIS标准采用的抗噪声措施进行了分析，并用具体实例说明其效果；论文指出CDMA（码分多趾）方式 通过降低传输速率来提高抗干扰能力，虽然抗干扰能力稍微好一点，但传统速率低，不适应宽带业务的需要，作者提出的新型网络结构，用户之间采用串行方式，能消防上行信道噪声的漏斗效应，传输速度高，可适应宽带业务的需要，但技术上尚须进一步完善。

Upstream Transmission Way in a HFC Network

In the HFC network, the funnelling effect of noise is the main restrict matter of raising the rate in the up stream channel. The requirements for the wide band services in a up stream channel are fist studied, and used as the criteria to compare the transfer ways each other used in up stream channel. Then, the ways in DOCSIS are analyzed, which were used to resist the noise, and the effect is showed by an example. The raised ability of resisting noise in the CDMA is obtained by reducing the transfer rate. Although it has a little better performance in resisting noise, but the rate is low and can not meet the requirements of wide band services. A kind of network structure is given, in which the users are connected in serial way, the noise funnelling is eliminated and have a high rate in the up stream channel. It is suitable for the wide band services, but the technology realizing the network structure needs perfecting.