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Multi-diversity launching and receiving equipment of mobile digital multimedia broadcasting system

A multimedia broadcasting, mobile digital technology, applied in digital transmission systems, error prevention/detection through diversity reception, diversity/multi-antenna systems, etc. Diversity and other issues to achieve the effect of enhancing system coverage, improving system availability, and improving listening and viewing effects

Active Publication Date: 2009-01-14
CHENGDU JIUZHOU ELECTRONIC INFORMATION SYSTEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, the transmitting and receiving ends of this kind of multimedia broadcasting system are unified at the same frequency and time, and the multiple diversity of frequency and time has not been realized. The mobile receiving terminal is affected by multipath fading and Doppler frequency shift. When passing through obstacles such as tunnels and bridges and culverts, signal interruptions are likely to occur, which affects mobile terminals receiving wireless digital multimedia broadcasting networks

Method used

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  • Multi-diversity launching and receiving equipment of mobile digital multimedia broadcasting system

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Embodiment Construction

[0022] The present invention will be further elaborated below in conjunction with the accompanying drawings.

[0023] As shown in Figure 1, the multiple diversity transmitting and receiving device of the mobile digital multimedia broadcasting system consists of two satellites 1, a ground station 2 and a receiving terminal 3. There is one S-band on each satellite 1, the frequency of the two S-bands is different, there is an interval of 1M, and the bandwidth is at least 8M. There is a 1 second delay between the signals transmitted on the S-band of the two satellites 1. Ground station 1 is in the UHF band, with a bandwidth of at least 8M. Ground station 1 is delayed by 1 second longer than the longest delay of two satellites 1. The receiving terminal 3 uses a broadband antenna and three independent signal receiving devices that can simultaneously receive the S-band transponder and the UHF-band ground station 2 to simultaneously receive the data of the S-band of the two satellite...

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Abstract

The invention discloses a multi-diversity transmission and receiving device for mobile digital multimedia broadcasting system comprising at least two different S wavebands positioned on satellite (1) and at least a UHF wave band earth station. Signal between S wavebands delays T seconds and earth station signal delays T seconds again. Receiving terminal installed with cache and multiple independent signal receiving device simultaneously receives signals of S waveband and earth station and aligned them using the most delayed signal as standard, outputs them through diversity and convergence device. The invention overcomes deficiency of signal interruption arising from multipath fading, Doppler shift and barrier of existing technology, provides a mobile digital multimedia broadcasting system for solving short time shadow, which can be widely used in digital broadcasting, TV field.

Description

technical field [0001] The invention relates to a diversity device, in particular to a multiple diversity transmitting and receiving device for mobile digital multimedia. Background technique [0002] Mobile multimedia broadcasting is a newly emerging multimedia playback technology in recent years. Generally, it is a wireless digital multimedia broadcasting network that uses satellites and ground repeating stations to carry out "satellite integration" coverage. Through the mobile terminal, the user can watch multimedia broadcasting programs such as TV while moving at a high speed. The current method of using satellite-ground integrated wireless broadcasting is: use S-band dual-satellite signals on the same track to cover a large area, use ground transponders to forward satellite signals at the same frequency and content at the same time to supplement satellite signal blind areas, and establish a satellite-ground integrated S-band single frequency network. However, the tra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/02H04L27/00H04L1/02
Inventor 祁权生
Owner CHENGDU JIUZHOU ELECTRONIC INFORMATION SYSTEM CO LTD
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