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Power-line-based digital terrestrial multimedia broadcasting (DTMB) transmission method and device

A broadcast transmission and power line technology, which is applied in broadcast transmission systems, electrical components, selective content distribution, etc., can solve problems such as increased overhead, poor WiFi signal coverage, poor security, etc., and achieve good application prospects

Active Publication Date: 2015-05-20
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

DTMB-based multimedia broadcast transmission technology has the advantages of good transmission performance, wide range of equipment applications, and low coverage cost. However, due to the huge attenuation of wireless signals through walls, its indoor coverage has certain technical difficulties.
In addition, a DTMB set-top box usually can only provide multimedia services for a TV, which increases the cost of indoor multimedia broadcasting coverage in homes, hotels, entertainment industries, etc., and brings a lot of inconvenience
[0003] In order to reduce the cost of indoor multimedia broadcast transmission, WiFi-based indoor multimedia sharing technology was proposed, which has become the most widely used solution for indoor multimedia broadcast transmission and sharing, but it still has some shortcomings that cannot be ignored, such as WiFi signals in complex The coverage in the building environment is not good, the safety is not good, and there may be more electromagnetic radiation to the human body, etc.

Method used

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  • Power-line-based digital terrestrial multimedia broadcasting (DTMB) transmission method and device
  • Power-line-based digital terrestrial multimedia broadcasting (DTMB) transmission method and device
  • Power-line-based digital terrestrial multimedia broadcasting (DTMB) transmission method and device

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Experimental program
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Effect test

Embodiment 1

[0065] Embodiment 1 provides a specific implementation of a power line-based DTMB broadcast transmission method proposed by the present invention.

[0066] In this embodiment, the transmitter generates a DTMB broadcast TV program signal for indoor multimedia broadcast transmission, and the working mode of the DTMB broadcast program signal is Mode 1: the number of subcarriers is 3780, 16QAM modulation, the LDPC code rate is 0.4, and the PN length is 945 , the interleaving depth is 720, and the net code rate of the system is 9.626Mbps.

[0067] S1. The transmitter generates or forwards DTMB radio and TV program signals, performs analog processing on the signal at the transmitter and couples it to the power line for transmission;

[0068] In this embodiment, the transmitter generates the DTMB broadcast program signal, first carries out source coding on the existing program signal, and then performs LDPC coding, interleaving, constellation mapping, framing, etc. on the signal afte...

Embodiment 2

[0074] Embodiment 2 provides a specific implementation of a power line-based DTMB broadcast transmission proposed by the present invention.

[0075] In this embodiment, the transmitter forwards the DTMB broadcast TV program signal for indoor multimedia broadcast transmission. The working mode of the DTMB broadcast program signal is mode three: the number of subcarriers is 3780, 16QAM modulation, the LDPC code rate is 0.6, and the PN length is 945 , the interleaving depth is 720, and the net code rate of the system is 14.438Mbps.

[0076] S1. The transmitter generates or forwards DTMB radio and TV program signals, performs analog processing on the signal at the transmitter and couples it to the power line for transmission;

[0077] In this embodiment, the transmitter forwards the DTMB broadcast program signal, receives the DTMB broadcast program signal through the antenna, and down-converts the signal to the power line communication frequency band of 12MHz to 20MHz. The signal...

Embodiment 3

[0083] Embodiment 3 provides a specific implementation manner of a power line-based DTMB broadcast transmission proposed by the present invention.

[0084] In this embodiment, the transmitter forwards the DTMB broadcast TV program signal for indoor multimedia broadcast transmission. The working mode of the DTMB broadcast program signal is mode five: the number of subcarriers is 3780, 16QAM modulation, the LDPC code rate is 0.8, and the PN length is 420 , the interleaving depth is 720, and the net code rate of the system is 21.658Mbps.

[0085] S1. The transmitter generates or forwards DTMB radio and TV program signals, performs analog processing on the signal at the transmitter and couples it to the power line for transmission;

[0086] In this embodiment, the transmitter forwards the DTMB broadcast program signal, receives the DTMB broadcast program signal through the antenna, and converts the signal to the power line communication frequency band of 22MHz to 30MHz. The signa...

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Abstract

The invention discloses a power-line-based digital terrestrial multimedia broadcasting (DTMB) transmission method and a power-line-based DTMB transmission device. The method comprises the following steps of: 1, generating or forwarding a DTMB broadcasting and television program signal, performing transmitter simulation processing on the signal, and coupling the signal to a power line for transmission by using a transmitter; 2, coupling and receiving the signal transmitted through the power line, performing receiver simulation processing on the signal, and performing channel decoding by using a receiver; and 3, performing signal source decoding on the signal subjected to the channel decoding, and playing or sharing the signal subjected to the signal source decoding in a multimedia terminal. A power line communication technology is used for finishing indoor multimedia broadcasting transmission and sharing, the conventional indoor multimedia transmission technology is effectively supplemented, the method is an effective method for the indoor coverage of a DTMB signal, and the method and the device have broad application prospect.

Description

technical field [0001] The present invention relates to the technical field of home multimedia broadcasting, in particular to a power line-based DTMB (Digital Terrestrial Multimedia Broadcasting) broadcast transmission method and device. Background technique [0002] With the overall promotion and implementation of digital TV, and the popularization of information-based multimedia terminals, indoor multimedia broadcasting transmission technology and applications have also received more and more attention from the industry. DTMB-based multimedia broadcast transmission technology has the advantages of good transmission performance, wide application of equipment, and low coverage cost. However, due to the huge attenuation of wireless signals through walls, its indoor coverage has certain technical difficulties. In addition, a DTMB set-top box usually can only provide multimedia services for a TV set, which increases expenses and brings a lot of inconvenience to the coverage of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04H20/84H04N21/2383
Inventor 宋健丁文伯杨昉阳辉
Owner TSINGHUA UNIV
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