Performance Of Multiple Quadrature Amplitude Modulations On The Bi-Directional Network Of Cable TV

With the rapid development of the communication network, single business network can’t meet customers’ requirements any more, then the multi-business network integration is drawing customers’ attention. Especially, triple network integration point out the direction for the business integration. Triple network integration, is that the telecommunicate, computer network and cable television are integrated to a single information communication network through technology innovation and mutual fusion, which provide multimedia communication business, such as voice, data and images to customers.With the rapid development of the communication network, single business network can’t meet customers’ requirements any more, then the multi-business network integration is drawing customers’ attention. Triple network integration point out the direction for the business integration. Triple network integration, is that the telecommunicate, computer network and cable television are integrated to a single information communication network through technology innovation and mutual fusion, it is a unified information communication network which provide multimedia communication business, such as voice, data and images to customers.There are opportunities and challenges exist in the development of triple network integration. The traditional cable TV network have been researched for30years, this technology have its own complete system, but with the coaxial cable during the construction, it can’t provide a two-way transform for our customers, then the reform of the two-way cable TV network is imminent. The reform of the two-way cable TV network can make the basic network provide two-way business, it also build an efficient network platform for the constructing of NGB and provide a strong foundation for the broadcast TV.In this thesis, we research the architecture of the broadcast TV in our country based on the current situation of the tow-way reform of the cable TV in Yunnan province, make a classification standard based on the level and contents during the transform. We make an analysis for the head, subhead and access terminate in the broadcast TV network combined the common used six access terminal network layout, describe the standards of each access network. With the guidance of advisor, we research the DVB-C based television modulation principles of the cable television, we focus on the MQAM (Multiple Quadrature Amplitude Modulation), MQAM is widely used technology in the cable modulation based on its higher utilization of frequency band. We make a description of the specification for the MQAM technology which widely used in the cable TV network, Matlab based simulation experiment verify the results of the technology in this thesis.