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Multi-service adaptation method based on DTMB (Digital Television Terrestrial Multimedia Broadcasting) single-frequency network system and implementation device thereof

A single-frequency network and multi-service technology, applied in the field of digital information transmission, can solve the problem that the DTMB single-frequency network adapter cannot be compatible with multiple formats of service transmission, and achieve the effect of saving system resources and expanding the scope of application

Active Publication Date: 2012-10-10
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to solve the problem that the existing DTMB single frequency network adapter cannot be compatible with multi-format service transmission without changing the traditional digital television receiver at all

Method used

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  • Multi-service adaptation method based on DTMB (Digital Television Terrestrial Multimedia Broadcasting) single-frequency network system and implementation device thereof
  • Multi-service adaptation method based on DTMB (Digital Television Terrestrial Multimedia Broadcasting) single-frequency network system and implementation device thereof
  • Multi-service adaptation method based on DTMB (Digital Television Terrestrial Multimedia Broadcasting) single-frequency network system and implementation device thereof

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Experimental program
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Effect test

Embodiment 1

[0060] This embodiment proposes a multi-service adaptation method. In the present embodiment, the DTMB single frequency network system terrestrial digital TV service (hereinafter referred to as the TV service) adopts the encoding method in the DTMB system: FEC0.8 (7488, 6016), the modulation method: 16QAM; the newly added mobile service ( Hereinafter referred to as the mobile service) is preprocessed by randomization in the DTMB system, FEC0.4 (7488, 3008) encoding, bit interleaving, and 2 times bit extension from 4QAM to 16QAM; the insertion position of the second frame initialization TS packet is located in the mobile In the business frame. The service adaptation method in this embodiment specifically includes the following steps:

[0061] S101: Input 8 TV service TS packets;

[0062] S102: Input a data block with a length of 3008 bits for the mobile service, and after preprocessing such as randomization, FEC0.4 (7488, 3008) encoding, bit interleaving, and 2 times bit exte...

Embodiment 2

[0067] This embodiment proposes another multi-service adaptation method. In the present embodiment, the terrestrial digital television service of the DTMB single frequency network system (hereinafter referred to as the television service) adopts the encoding method in the DTMB system: FEC0.6 (7488, 4512), and the modulation method: 64QAM; Mobile service for short) is set to have undergone preprocessing such as randomization in the DTMB system, FEC0.8 (7488, 6016), bit interleaving, and 3 times bit expansion from 4QAM to 64QAM; the insertion position of the second frame initialization TS packet is located in the mobile service frame middle. The service adaptation method in this embodiment specifically includes the following steps:

[0068] S201: Input 9 TV service TS packets;

[0069] S202: Input a data block with a mobile service length of 6016 bits, and obtain 7488*3 bits of data after preprocessing such as randomization, FEC0.4 (7488, 3008) encoding, bit interleaving, and ...

Embodiment 3

[0074] This embodiment proposes a multi-service adaptation method according to an implementation manner of the present invention. In the present embodiment, the terrestrial digital television service of the DTMB single frequency network system (hereinafter referred to as the television service) adopts the encoding method in the DTMB system: FEC0.6 (7488, 4512), and the modulation method: 64QAM; Mobile service for short) is set to have undergone preprocessing such as randomization in the DTMB system, FEC0.8 (7488, 6016), bit interleaving, and 3 times bit expansion from 4QAM to 64QAM; the second frame initialization TS packet insertion position is located in the TV service frame . The service adaptation method in this embodiment specifically includes the following steps:

[0075] S301: Input 9 TV service TS packets;

[0076] S302: Input a data block with a mobile service length of 6016 bits, and after preprocessing such as randomization, FEC0.4 (7488, 3008) encoding, bit inter...

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Abstract

The invention discloses a multi-service adaptation method based on a DTMB (Digital Television Terrestrial Multimedia Broadcasting) single-frequency network system, comprising the following steps of: S1. generating a second frame initialization packet at the data stream initial position of a pulse per second by utilizing a GPS reference clock; S2. carrying out standard format matching on new service data in the DTMB single-frequency network system according to the model and the timing sequence mode of the DTMB single-frequency network system to obtain a newly increased equivalent service data packet; and S3. carrying out time division multiplex on the original service data packet, the second frame initialization packet, the newly increased equivalent service data packet and a single-frequency network adaption empty packet in the DTMB single-frequency network system according to the timing sequence mode to obtain single-frequency network multiplex data output. In the invention, the traditional DTMB single-frequency network system is expanded on the basis of not changing the original terrestrial digital television service receipt completely, thereby making the DTMB single-frequency network system compatibly transmit multiple services and broadening the application range of the system.

Description

technical field [0001] The invention relates to the technical field of digital information transmission, in particular to a multi-service adaptation method based on a DTMB single frequency network system in a wireless or wired broadcast communication system and a device for realizing it. Background technique [0002] In the past two decades, with the rapid development of modern communication technology, the proprietary communication system for transmitting various services has become the most basic communication system for existing single services because of its strong pertinence, and has been widely used in wireless local area networks, wireless Or communication systems such as cable digital audio and video broadcasting, for example, the European digital TV terrestrial broadcasting standard and the Chinese digital TV terrestrial broadcasting single frequency network system, etc. [0003] China's Digital Television Terrestrial Multimedia Broadcasting (DTMB) single-frequency ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/24H04N7/26H04J3/00H04N21/236
Inventor 杨知行王晓晴王劲涛阳辉张超李彦刚
Owner TSINGHUA UNIV