Single frequency net front end center transmitting station for multi-channel of digital television ground broadcast

Abstract

A multi-channel single frequency network front-end center transmitting station of digital television terrestrial broadcasting includes a program signal input part, a source processing part, a channel processing part, a transmitting train-synthesis-transmitting antenna feed part, and a data-software management control part; adopts mature digital source coding and processing technology to perform channel coding and modulation processing meeting China national standard GB20600-2006 to the transmitted channels, and form a multi-channel DTTB transmission network center transmitting station according to the needs of system operations; and has main characteristic that it adopts adjacent channels or alternate channels same station transmitting, same station transmitting of multi-channel same power or different transmitting powers. The transmitting station can constitute a network separately, more importantly, provide front-end supports for the formation of digital television terrestrial broadcasting multi-channel single frequency network.

Description

technical field [0001] The present invention relates to a transmission system of a digital television terrestrial broadcasting (Digital Television Terrestrial Broadcasting, DTTB) transmission network system, in particular to a digital television terrestrial broadcasting multi-channel single frequency network (Digital Television Terrestrial Broadcasting--Multi-band Single Frequency Network) front-end center launch pad. Background technique [0002] In order to adapt to the complex terrestrial broadcast transmission environment, there are currently three DTTB standards in the world: the American Advanced Television Systems Committee (Advanced Television Systems Committee, ATSC), the European Terrestrial Digital Video Broadcasting (Digital Video Broadcasting-Terrestrial, DVB-T) and Japan ISDB-T (Integrated Services Digital Broadcasting-Terrestrial). China's DTTB standard is declaring the fourth international standard. There are three types of business service models of DTTB n...

AI Technical Summary

Problems solved by technology

In 1999, when the DVB-T / COFDM multi-carrier system competed with the ATSC / 8-VSB single-carrier system in the United States, the former emphasized that the latter had three deficiencies: a) poor ability to deal with "echo" (ghosting); b ) cannot realize mobile reception; c) cannot realize "Single Frequency Network" (Single Frequency Network, SFN)

In particular, if the fixed reception mode wants to achieve repeated coverage of the same frequency in a large area, it will be difficult to implement without solving the technical problems of adjacent frequency networking, and it will be impossible to get rid of the confusion presented by the shortage of frequency resources.

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