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Transferring ssytem of signal communication in digital multimedia broadcast system and mode

A technology of multimedia broadcasting and transmission mode, applied in the transmission system and transmission mode of control and data communication, audio and video fields, can solve the problem of no data channel, etc.

Inactive Publication Date: 2004-07-28
TIMI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the current DVB standard, video and audio communications are transmitted together, and there is no dedicated data channel

Method used

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  • Transferring ssytem of signal communication in digital multimedia broadcast system and mode
  • Transferring ssytem of signal communication in digital multimedia broadcast system and mode
  • Transferring ssytem of signal communication in digital multimedia broadcast system and mode

Examples

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Embodiment Construction

[0044] Fig. 1 uses the system composition and functional block diagram of the transmission mode of video, audio frequency, control and data communication in the digital multimedia broadcasting system of the present invention; As shown in Fig. 1, before broadcasting, video, audio frequency and data communication are first cut Splitter separation. Different channel coding and modulation can be applied to these traffic streams to provide different levels of protection. The outputs of the constellation mappers are loaded into separate communication channels. Together with the control channels, all communication channels are multiplexed to form OFDM symbols, which are passed to the headend for transmission.

[0045] Fig. 2 is the allocation of communication channels based on clustered OFDM used in the transmission mode of video, audio frequency, control signal and data communication in the digital multimedia broadcasting system of the present invention; a key innovation of the mod...

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Abstract

The invention provides a system and mode of new signal multi-path multiplexing in OFDM broadcast network. In the invention, the mixed signals are modulated into different OFDM communication channels, each channel data includes a fixed quantity OFDM sub-carriers. Different Golay code, modulation and frequency expansion are used in communication of different service quality demand. The data is transmitted with data package of circular redundancy checking bit.

Description

technical field [0001] The present invention relates to the transmission system and transmission mode of signal communication in digital multimedia broadcasting system, especially relates to the transmission system and transmission mode of video, audio, control and data communication in digital multimedia broadcasting system. Background technique [0002] A major challenge for next generation wireless broadcast networks is to support integrated multimedia type communications on a unified network platform. An efficient transport mode that can support various types of traffic with various data rates is very important to achieve the above requirements. [0003] The current European digital video broadcasting system (DVB-T) chooses Orthogonal Frequency Division Multiplexing (OFDM) as the modulation mode because of its robustness against multipath fading, high spectral Efficiency and other advantages. Combined with preamble error detection, OFDM (Orthogonal Frequency Division M...

Claims

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Application Information

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IPC IPC(8): H03M7/30H03M13/03H03M13/37H04J11/00H04L27/32H04N7/015
Inventor 刘辉王联邢观斌沈漫源杨庆华
Owner TIMI TECH
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