Ground digital TV overlay transmission cellular single-frequency network overlay system

A terrestrial digital TV and single-frequency network technology, applied in the field of cellular single-frequency network coverage systems, can solve problems such as low cost performance, achieve high cost performance, solve the coverage area, and expand the coverage effect.

Inactive Publication Date: 2007-08-22
SHANGHAI HIGH DEFINITION DIGITAL TECH IND
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of single frequency network based on digital baseband requires corresponding modulators and dedicated data transmission equipment at each transmission point, which is low in cost performance

Method used

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  • Ground digital TV overlay transmission cellular single-frequency network overlay system

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Embodiment Construction

[0011] The drawing depicts an embodiment of the invention. The drawings include: cable TV signal 1, up-converter 2, terrestrial digital TV modulator 3, radio frequency combiner 4, laser transmitter 5, optical transmission network 6, laser receiver 7, distributor 8, power amplifier 9 , 10, M channel radio frequency adapter 11, N channel radio frequency adapter 12, multiplexer 13, transmitting antenna 14. A set of laser receiver 7 , distributor 8 , power amplifiers 9 and 10 , M channel radio frequency adapter 11 , N channel radio frequency adapter 12 , multiplexer 13 and transmitting antenna 14 together form a set of cellular adaptation transmitting equipment. Another group or groups form another set or sets of cellular adaptation transmitting equipment.

[0012] This embodiment utilizes the cable TV optical transmission network, and the radio frequency signal modulated by terrestrial digital television and the cable TV signal carry out radio frequency combination, and transmit...

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Abstract

A cellular single frequency network of ground digital TV transmission is prepared as inputting radio frequency signal outputted from radio frequency signal optical transmission network to single frequency network adapter, carrying out time delay treatment on relevant channel radio frequency signal by said adapter then sending treated signal to emission unit, making power control on treated signal by amplifier and emitting large power radio frequency signal by multiplexer through antenna.

Description

technical field [0001] The invention relates to television broadcasting technology, and is a television signal transmission system, specifically, a cellular single frequency network coverage system for terrestrial digital television coverage transmission. Background technique [0002] Due to the complex topography and wide area in the vast rural areas, mountainous areas, and suburban areas, the coaxial cable has restricted the construction and development of cable TV in rural areas due to the large investment in transmission coverage. In rural areas, it is necessary to realize the transmission coverage of terrestrial wireless digital TV. At present, the domestic ground transmission technology mainly adopts the multi-channel microwave distribution system (MMDS Multichannel Microwave Distribution System) and the multi-channel decimeter wave distribution system (MUDS Multichannel UHF Distribution System). Order high-power SFN coverage. The working carrier frequency of the MMD...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/22H04N7/24H04N7/015H04N7/04H04L7/00
Inventor 杨亮马文峰
Owner SHANGHAI HIGH DEFINITION DIGITAL TECH IND
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