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Single-frequency network system of ground digital TV broadcast and its realizing method

A terrestrial digital TV and single frequency network technology, applied in the field of digital information transmission, can solve the problems of low transmission power and less stringent synchronization requirements.

Inactive Publication Date: 2005-10-05
TSINGHUA UNIV
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  • Claims
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Problems solved by technology

For economic considerations, the synchronization requirements of these dot fillers are not as strict as those of ordinary transmitters, so the transmission power is often much lower than that of ordinary SFN transmitters

Method used

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  • Single-frequency network system of ground digital TV broadcast and its realizing method
  • Single-frequency network system of ground digital TV broadcast and its realizing method
  • Single-frequency network system of ground digital TV broadcast and its realizing method

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Embodiment Construction

[0136] The theoretical analysis and specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0137] Fig. 7 shows the basic structure of the terrestrial digital television broadcasting single frequency network system proposed by the present invention. This system is mainly composed of three parts: SFN adapter, GPS receiver, and terrestrial digital TV broadcasting modulator supporting SFN. At the central transmitter, the SFN adapter inserts MIP packets at regular intervals in the MPEG-2 TS stream, and the MIP packets carry the synchronization time stamp (STS) related to the GPS receiver and the system maximum delay (MD) to each relay station and other information. At each relay station, the synchronization system detects the MIP packet, reads the time tag and the maximum delay from it, measures the received signal delay (MeasuredDelay), calculates the additional delay (Additional Delay), and appropriately d...

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Abstract

The system comprises three parts: adapter in single frequency network, GPS receiver, and modulator of supporting ground digital TV broadcasting in single frequency network. At central transmitting terminal, the adapter inserts MIP packets in transmission code stream. MIP packet carries synchronizing time label relevant to GPS receiver and system maximal time delay to each relay station etc. In each relay station, synchronization system detects M1P packets, reading out time label and maximal time delay, measuring time delay of received signal, calculating out additional time delay. According to the additional time delay, TS flow is delayed properly in order to make signal synchronization again among relay stations. The disclosed scheme is realized through FPGA, and is applied to ground digital multiple media broadcasting transmission system forwaded by Tsinghua Univ. Favorable effect is obtained through actual try.

Description

technical field [0001] The invention belongs to the technical field of digital information transmission, in particular to a Single Frequency Network (SFN) system of Digital TV terrestrial broadcasting (DTTB). Background technique [0002] In traditional analog TV broadcasting, in order to cover a certain area, adjacent transmitting stations need to use different frequencies to avoid mutual interference, and the same frequency must be reused at a certain distance, which is the multi-frequency network (Multi-Frequnecy Network , MFN) mode, as shown in Figure 1. In the multi-frequency network mode, multiple differential turntables must be used to reliably cover an area. Due to frequency reuse, multiple frequencies must be occupied to cover an area. In this way, one signal needs to occupy several times the bandwidth, consuming a large amount of spectrum resources. [0003] With the rapid development of television broadcasting technology, television has now entered a new era: th...

Claims

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Application Information

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IPC IPC(8): H04J11/00H04L7/00H04N7/015H04N7/04H04N7/24H04N21/2383H04N21/242
CPCH04N21/2383H04N21/242
Inventor 杨知行王劲涛房海东潘长勇王军韩猛
Owner TSINGHUA UNIV
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