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Reception method and unit of radio frequency front end of cognitive spectrum sensing receiver

A technology for cognitive spectrum and radio frequency front-end, applied in the field of radio frequency front-end receiving methods and units, it can solve the problems of limited frequency adjustable range and bandwidth of tuning filter, and it is difficult to sweep frequency in the whole frequency band, etc. Selectivity and passband characteristics, effects with less distortion

Inactive Publication Date: 2015-04-08
GUILIN UNIV OF ELECTRONIC TECH
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AI Technical Summary

Problems solved by technology

However, due to the limited frequency adjustable range and bandwidth of the tuning filter, it is difficult to realize full-band frequency sweep in the DVB-T frequency band

Method used

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  • Reception method and unit of radio frequency front end of cognitive spectrum sensing receiver
  • Reception method and unit of radio frequency front end of cognitive spectrum sensing receiver
  • Reception method and unit of radio frequency front end of cognitive spectrum sensing receiver

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Experimental program
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Embodiment Construction

[0047] A radio frequency front-end unit of a cognitive spectrum sensing receiver, such as figure 1 As shown, it is mainly composed of low-pass filter, low-noise amplifier, first local oscillator generator, first mixer, high-frequency filter, high-frequency amplifier, second local oscillator generator, second mixer, automatic Gain controller, tuned filter network, first single-chip microcomputer, second single-chip microcomputer and host computer. The tuned filter network includes a boost impedance matching transmission line transformer group, an electrical tuning filter, a tuned filter amplifier, a falling impedance matching transmission line transformer group and a digitally controlled DC stabilized voltage power supply. The input end of the low-pass filter is connected with the receiving antenna. The output end of the low-pass filter is sent to one of the input ends of the first mixer after passing through the low-noise amplifier. The data input terminal of the oscillator,...

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Abstract

The invention discloses a reception method and a unit of a radio frequency front end of a cognitive spectrum sensing receiver. In the whole frequency band of DVB-T, every xMHz is configured to be a sub-frequency band unit. Through twice frequency mixings, a reception signal is converted to a first high intermediate frequency through up conversion, and then is converted to a second intermediate frequency terminal through down conversion, and thus the whole sub-frequency band spectrum is moved to the neighboring of the intermediate frequency of xMHz. Frequency sweep is conducted on the frequency band through an electrically tuned filer which is in a yMHz bandwidth, and slides in a certain range as the center frequency varies with the change of the voltage. As such, signals in the yMHz bandwidth and are covered in the DVB-T full frequency band range can be received. The reception method and the unit of the radio frequency front end of the cognitive spectrum sensing receiver is characterized by DVB-T full frequency band coverage, relatively small mirror image interference, simple circuit design, simple intelligent operation and easy realization.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a radio frequency front-end receiving method and unit of a cognitive spectrum sensing receiver based on terrestrial digital television broadcasting (DVB-T) frequency band. Background technique [0002] Wireless spectrum resource is an extremely limited resource, and it is necessary for the relevant state departments to designate relevant regulations for unified management and authorize spectrum resources within a certain frequency band for specific purposes. With the development of wireless communication technology, people's demands for wireless services are increasingly diversified, and spectrum resources will become increasingly scarce. In order to alleviate the problem of the shortage of spectrum resources, the current management of spectrum resources can be realized by improving the spectrum utilization rate. The common practice adopted internationally is to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/16
Inventor 肖海林韩霄濮锦胜王丽元闫坤
Owner GUILIN UNIV OF ELECTRONIC TECH
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