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A method, center transmitter and remote transmitter for realizing single-frequency network synchronization

A technology of transmitter and single frequency network, which is applied in communication between multiple stations, radio transmission system, electrical components, etc. It can solve the problems of increasing transmission cost, complex structure of synchronization system, and affecting system safety and reliability. , to achieve the effect of eliminating potential safety hazards, simplifying the structure, and enhancing safety

Inactive Publication Date: 2008-03-26
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, although SFN synchronization technology and supporting equipment are relatively mature, due to the use of special adapters and an independent GPS system in addition to the digital TV transmission system, the overall structure of the synchronization system is complicated, and the additional equipment is not only It increases the cost of launching, and makes the joint debugging between the launching points more complicated; in addition, it is found in practice that once the GPS information is missing, the single frequency network system will be in a paralyzed state, and manual intervention cannot be rescued, seriously affecting System Security and Reliability

Method used

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  • A method, center transmitter and remote transmitter for realizing single-frequency network synchronization
  • A method, center transmitter and remote transmitter for realizing single-frequency network synchronization

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Embodiment 1

[0042] The method and related equipment involved in the present invention generally constitute a system for realizing SFN synchronization, as shown in Figure 1, including a central transmitter 1, a remote transmitter 2, a remote transmitter 3, and a receiving terminal 4, In the system, the central transmitter 1 includes a central transmission control module 11, the remote transmitter 2 includes a remote transmission control module 21, and the remote transmitter 3 includes a remote transmission control module 31;

[0043] With reference to Fig. 2, promptly the synchronous work process of the system described in the embodiment of the method of the present invention, comprises the following steps:

[0044] 1) Delay acquisition

[0045] The central transmission control module 11 pre-sets the reference transmission time, and obtains the time delay t of the remote transmitters 2 and 3 respectively. 2 , t 3 ,Specifically:

[0046] 11) The central transmission control module 11 of ...

Embodiment 2

[0066] The second embodiment of the present invention is to adjust the time delay of each remote transmitter only before the first data transmission starts, so as to meet the system synchronization requirement, and does not need to perform synchronization processing during the data transmission process. The main difference between this embodiment and Embodiment 1 is that instead of periodically sending a time stamp signal and acquiring the time delay, the time stamp signal is sent to the remote transmitter once before transmitting data for the first time to acquire the time delay at one time. The specific steps of delay acquisition are as follows:

[0067] 21) Before the first data transmission starts, the central transmission control module 11 sends a time stamp signal T to each remote transmitter 2, 3 respectively;

[0068] 22) The remote transmission control modules 21, 31 of the remote transmitters 2, 3 receive the time stamp signal T, and directly send the time stamp sign...

Embodiment 3

[0075] Introduce embodiment three in detail below, apply a kind of central transmitter that realizes single frequency network synchronization of the method of the present invention, this central transmitter comprises central transmission control module, with reference to Fig. 3, described central transmission control module comprises at least:

[0076] Delay acquisition unit, used to respectively acquire the delay t of each remote transmitter n ,as well as,

[0077] A transmission time adjustment unit, configured to adjust the time delay t forward from the reference transmission time for the time when the central transmitter transmits a signal to the remote transmitter respectively n .

[0078] Specifically, referring to Fig. 4, the delay acquisition unit includes:

[0079] The first timestamp sending module is configured to regularly send a timestamp signal to each remote transmitter; and,

[0080] The first timestamp receiving module is configured to receive the timestamp...

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Abstract

This invention discloses a method for realizing synchronization of single-frequency networks and a central transmitter and a far distance transmitter characterizing in including the following steps: 1, setting primary emitting time and getting time delay of a remote transmitter, 2, regulating the time for emitting singals to the remote transmitter to tn forward then emitting the signals, which simplifies a method for single-frequency networking and a structure of central transmitter and a remote transmitter since it does not synchronize with GPS.

Description

technical field [0001] The invention relates to communication transmission synchronization technology, in particular to a single-frequency network synchronization method, a central transmitter, and a remote transmitter. Background technique [0002] Single frequency network (single frequency network, SFN) is a single frequency network, the so-called single frequency network, that is, several transmitters in a certain geographical area transmit the same signal on the same frequency band at the same time, in order to achieve reliable transmission of the area. cover. Compared with traditional analog TV broadcasting, single frequency network does not need to reuse specific frequencies, and only one frequency band is needed to transmit one signal, which saves spectrum resources and brings transmit diversity gain at the same time. For the digital TV system, because it has strong anti-jamming ability and digital processing ability, SFN is a very favorable way to expand the coverag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/26H04B7/185
Inventor 张毅
Owner HUAWEI TECH CO LTD
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