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Signal transmitting method and system used for digital multimedia broadcasting

A signal transmission system and multimedia broadcasting technology, which is applied in the field of wireless communication, can solve the problems of no mapping relationship between time slices, long channel switching time, and convergence errors, etc., to improve system synchronization capabilities and frequency offset correction capabilities, and complicate packaging processing The effect of low degree and shortened synchronization time

Inactive Publication Date: 2007-08-22
HUAWEI TECH CO LTD
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Problems solved by technology

Therefore, the iterative approximation algorithm needs to be used in the DVB-H standard, which causes the problems of convergence error and time consumption, so the use of DVB-H technology will cause longer synchronization time
Moreover, when the signal is sent in BURST mode, the shortcoming of DVB-H technology's long synchronization time is particularly obvious
[0006] In addition, DVB-H follows the physical layer frame structure in DVB-T, and the time-slice (time-slice) of different programs has no direct mapping relationship between physical layer frames and super frames
Moreover, the program search of DVB-H is determined by PSI / SI information. When performing channel search and switching, it is necessary to traverse all programs to determine the position of the desired program, so the channel switching time is longer
At the same time, if the channel is switched frequently, the power consumption of the terminal will be large

Method used

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  • Signal transmitting method and system used for digital multimedia broadcasting
  • Signal transmitting method and system used for digital multimedia broadcasting
  • Signal transmitting method and system used for digital multimedia broadcasting

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Embodiment

[0102] It can be set that the sampling frequency of the digital multimedia signal transmission system is 7.56MHz, the number of sampling points of OFDM data is 3780 points, and the length of the guard interval is 420 points. A superframe is composed of 3600 OFDM symbols, and the duration is 2 seconds. The superframe includes a superframe prefix, a superframe control information, and 8 program group frames. A superframe prefix occupies 1 OFDM symbol, and a superframe control information occupies 7 OFDM symbols.

[0103] Wherein, the duration and the number of programs contained in a program group frame can be determined according to the actual operation situation, and indicated to the receiving terminal in the superframe information. A program framing prefix occupies 1 OFDM symbol, and a program framing control information occupies 1 OFDM symbol.

[0104] The duration of a program and the number of OFDM symbols included can be determined according to the actual operation situa...

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Abstract

A signal transmission system used on digital multimedia broadcast comprises source adaptive buffer storage for buffer-storing data sent from source and for sending data to channel modulator, channel modulator for carrying out coding-modulation on received data and for sending coding-modulated data out, channel demodulator for carrying out decoding-modulation on received data and information sink buffer storage for buffer-storing received data.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, and more particularly, to a signal transmission method and system for digital multimedia broadcasting. Background technique [0002] Since entering the 21st century, wireless communication technology is developing at an unprecedented speed. With the increase of users' demand for various real-time multimedia services and the rapid development of Internet technology, the future wireless communication technology will have a higher information transmission rate to provide users with greater convenience. In order to support higher information transmission rate and higher mobile speed of users, wireless transmission technology with higher spectral efficiency and stronger anti-multipath interference capability is required in the next generation of wireless communication. Among various wireless schemes that provide high-speed transmission at present, multi-carrier modulation techn...

Claims

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Application Information

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IPC IPC(8): H04L5/00H04L29/06H04L27/26
Inventor 肖蛰水张毅
Owner HUAWEI TECH CO LTD
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