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Method for adapting single frequency net in digital broadcasting satellite system

A broadcasting system, digital satellite technology, applied in the field of digital information transmission, can solve the problem of the same free oscillation frequency

Inactive Publication Date: 2009-03-11
TIMI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the free oscillation frequency of each transmitter is difficult to achieve exactly the same, it is necessary to design a method to adjust the carrier frequency of each transmitter to the same frequency point

Method used

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  • Method for adapting single frequency net in digital broadcasting satellite system
  • Method for adapting single frequency net in digital broadcasting satellite system
  • Method for adapting single frequency net in digital broadcasting satellite system

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Embodiment Construction

[0014] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0015] FIG. 1 is a flowchart of a method for adapting a single frequency network of a digital satellite broadcasting system according to a first embodiment of the present invention. The digital satellite broadcasting system that realizes this method includes a satellite and a ground transmitter, and the carrier signal transmission frequency of the ground transmitter is locked on the reference frequency 2647.5 MHz. This method also locks the frequency of the satellite downlink signal at 2647.5 MHz through the closed-loop control described below. 2647.5MHz.

[0016] In this embodiment, the atomic clock is used as the clock source, and the frequency of the clock signal generated by it is 10MHz. After the clock signal is multiplied by 264.75 times of the reference frequency generator, the frequency is generated as a referenc...

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Abstract

The method regulates the carrier frequency (CF) of all emitters in the satellite broadcast system (SBS) to the same frequency point. Emitters send the broadcast signal on the same CF. this realizes a large range seamless cover in SBS, i.e. the single frequency net cover. The steps to realize are: according to the hi-precision clock signal generated by the clock source, producing a standard frequency signal; mixing the satellite down-going signal with this standard signal to obtain the baseband signal carrying the frequent difference (FD); the FD estimator estimates FD residing in the baseband signal; according to this estimation, producing the mid-frequency signal (MFS) on suitable frequencies; carrying out RF up-conversion for MFS so as to produce the satellite up-going signal (SUS); The satellite carries out frequency conversion and amplification for SUS to produce the satellite down-going signal. Cycling above steps realizes synchronization of satellite broadcast net frequency.

Description

technical field [0001] The invention relates to digital information transmission technology, in particular to a method for adjusting the carrier frequency of each transmitter to the same frequency point in a digital satellite broadcasting single frequency network. Background technique [0002] Digital broadcasting has the characteristics of wide coverage and large signal capacity. Its biggest feature is that it is broadcast, point-to-multipoint, point-to-face, and the cost of broadcasting information has nothing to do with the number of users. Therefore, as an important part of the information communication industry, digital broadcasting plays an important role in the construction of national information infrastructure, the realization of universal service and the national information security strategy. [0003] For the digital broadcasting system, due to its strong anti-jamming capability and digital processing capability, SFN is a very favorable way to expand coverage. Si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/185H04L25/02H04L27/26H04L7/00H04B1/10
Inventor 葛启宏陶涛刘辉杨庆华
Owner TIMI TECH
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