Ground digital television system with wired transmission and wireless coverage

Abstract

The invention discloses a ground digital television system with wired transmission and wireless coverage. In the invention, by utilizing largely constructed HFC network transmission, concentration code and well modulated broadband ground digital television signal, in an area which needs wireless coverage, a low power broadband transmitter and directional aerial are employed to carry out covering directly. By employing a co-frequency multi-point wireless coverage mode and inhibiting co-frequency interference through controlling coverage area field intensity and field type, large scope coverage is realized. Thus problems of co-frequency interference and lack of frequency resource are solved with the above simple method, and problems of large scope and low cost wired transmission and wireless coverage in rural area are also solved. The ground digital television system provided in the invention has good effect on extending cable television coverage, enlarging service scope and saving investment.

Description

technical field [0001] The invention relates to the field of cable TV transmission and wireless transmission, in particular to a system that combines the existing cable TV HFC network with terrestrial digital TV wireless transmission to cover a large area of ​​digital TV signals through wired transmission and wireless coverage. Background technique [0002] The existing terrestrial digital TV coverage adopts dual national standard technical standards, that is, the AVS coding standard and the national standard for terrestrial digital TV transmission for wireless coverage. There are two national standards for terrestrial digital TV transmission: ADTB-T is suitable for high-power coverage, and DMB-T is suitable for low-power cellular coverage. [0003] In order to achieve seamless coverage, no matter what scheme is adopted, it is necessary to establish multiple transmission points, and in order to solve the problems of co-channel interference and full utilization of frequency r...

AI Technical Summary

Problems solved by technology

[0003] In order to achieve seamless coverage, no matter what scheme is adopted, it is necessary to establish multiple transmission points, and in order to solve the problems of co-channel interference and full utilization of frequency resources, the single frequency network (SFN) method is used for networking, which is technically complicated and the transmission and launch equipment and systems are relatively complex

The multi-frequency network MFN networking method is a traditional networking method, and the utilization rate of frequency resources is low.

Images