System and method for synchronizing broadcast frequency and system time of digital single-frequency broadcasting network

Abstract

The invention discloses a system and method of digital single frequency network broadcast frequency and system time synchronization. Said ground supplement transponder adds synchronization module which can resume system clock, system time, carrier wave frequency. Main station adds picking up and packaging module of secondary planet frequency-difference information. Said method includes steps as following: main station modulates the information source data and frequency expanding data according to system clock, and modulates the system time to the frequency expanding information; ground supplement transponder sends the same digital broadcast signal according to the system clock which is resumed from the information source data, system time and secondary planet frequency-difference information which are get from the frequency expanding information and the same carrier wave and time as the secondary planet transmit digital broadcast signal. The invention resolves the problems of frequency synchronization and time synchronization which are the most pivotal in single frequency net system synchronization, and it possesses very important utility value.

Description

technical field [0001] The invention relates to a communication technology, in particular to a system and method for synchronizing the broadcasting frequency and system time of a digital single-frequency broadcasting network. Background technique [0002] Wireless digital broadcasting technology is the inevitable result of the development of communication technology. The application of this technology can improve the coverage quality of the broadcasting network and expand the coverage of the broadcasting network. [0003] In practical applications, if ground coverage is used directly, the network construction cost and maintenance cost are very high; if direct satellite coverage is used, rural areas and remote mountainous areas can be directly received, and unobstructed areas in cities can also be directly received, but for cities In places where there are a lot of building blocks, the coverage effect is very unsatisfactory. Therefore, for these areas with poor coverage quali...

AI Technical Summary

Problems solved by technology

[0009] It can be seen that in the prior art, both carrier synchronization and time synchronization rely on independent GPS devices, but in practical applications, once the information of GPS devices is missing, the entire system will be paralyzed due to lack of synchronization

At this time, even manual intervention is useless

Moreover, the use of GPS equipment for synchronization also leads to an increase in system cost and makes the networking and joint debugging between supplementary transponders on the ground more complicated.

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