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Spectrum sensing and distributing method and system based on ground digital video broadcasting frequency band

A technology of terrestrial digital TV and radio frequency bands, applied in the field of communication, can solve problems such as wasting transmission time of cognitive users, achieve the effect of solving image interference problems, prolonging communication time, and improving system integration

Inactive Publication Date: 2014-10-15
ZHEJIANG UNIVIEW TECH CO LTD
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AI Technical Summary

Problems solved by technology

Such frequent spectrum detection will waste the transmission time of cognitive users
And when the licensed user returns to the occupied frequency band, the cognitive user will cause interference to the licensed user

Method used

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  • Spectrum sensing and distributing method and system based on ground digital video broadcasting frequency band
  • Spectrum sensing and distributing method and system based on ground digital video broadcasting frequency band
  • Spectrum sensing and distributing method and system based on ground digital video broadcasting frequency band

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Embodiment Construction

[0028] A method for frequency spectrum detection and allocation based on terrestrial digital television broadcasting frequency bands, such as figure 1 shown, including the following steps:

[0029] (1) The cognitive central processor sends a communication request to the base station communicator through the cognitive communicator, the base station communicator transmits the request information to the base station central processor, the base station central processor records the number of cognitive users, and spectrum detection starts.

[0030] (2) The radio frequency antenna receives the DVB-T frequency band signal, and the radio frequency front-end divides the whole frequency band into several sub-bands according to the preset sub-band bandwidth, and the base station central processor moves each sub-band to zero by changing the output frequency of the radio frequency front-end local oscillator frequency, and divide it into I and Q two channels and send it to the baseband proc...

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Abstract

The invention discloses a spectrum sensing and distributing method and system based on the ground digital video broadcasting frequency band. An energy detection algorithm and a cyclic prefix algorithm are loaded in a base band processing module. The frequency band can be detected by setting the energy threshold value according to the energy detection algorithm. The energy detection algorithm is used for detecting the frequency band which is not occupied by cognitive users. The cyclic prefix algorithm is specially used for detecting a DVB-T signal. In the frequency band occupied by the cognitive users, whether the frequency band is reoccupied by an authorized user or not can be detected according to the cyclic premix algorithm, and if the authorized user is detected, the cognitive users stop occupying the frequency band at once, and interference with the authorized user is avoided. By means of the spectrum sensing and distributing method and system, full-band detection can be conducted on the DVB-T frequency band, self-adaptive frequency band switching can be achieved, and the idle frequency band can be accurately found in real time and can be distributed to all the cognitive users for use. On this basis, the authorized user can be detected, and the cognitive users can exit in time and switch to other idle frequency bands.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method and system for frequency spectrum detection and allocation based on terrestrial digital television broadcasting frequency bands. Background technique [0002] At present, wireless communication devices are increasing rapidly, but spectrum resources available for wireless communication are becoming increasingly scarce, and spectrum resources are becoming more and more precious. However, there are a large number of "spectrum holes" in the licensed frequency band. These "spectrum holes" are not used by authorized users most of the time. How to use these "spectrum holes" has become a research hotspot. Cognitive radio spectrum detection technology emerged as the times require, which allows unlicensed users (cognitive users) to use licensed user frequency bands for communication when licensed users do not use "spectrum holes". How to detect idle frequency bands that ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/00H04W16/10
Inventor 肖海林王成旭刘彩丽贺栋梁闫坤胡立坤
Owner ZHEJIANG UNIVIEW TECH CO LTD
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