Method and system for secondary user detection of cognitive radio spectrum

A cognitive radio and secondary user technology, applied in transmission systems, electrical components, transmission monitoring, etc., can solve problems such as detection failure and no solution strategy

Active Publication Date: 2016-11-30
INNER MONGOLIA UNIVERSITY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] In the prior art, when the primary user uses frequency hopping to communicate, the secondary user of cognitive radio usually uses the time-domain autocorrelation detection method for spectrum detection. At this time, if the frequency hopping signal of the primary user is serially inserted into a burst of fixed-frequency interference, it will cause Failed to detect
At present, there is no relevant solution strategy for this technical problem.

Method used

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  • Method and system for secondary user detection of cognitive radio spectrum
  • Method and system for secondary user detection of cognitive radio spectrum
  • Method and system for secondary user detection of cognitive radio spectrum

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Embodiment

[0092] Assume that the detection frequency band is mainly composed of frequency hopping signal, noise and fixed frequency interference, because the frequency hopping signal is a non-stationary signal.

[0093] First, a segment of non-stationary signal is divided into several segments of stationary signal.

[0094] Assuming that the non-stationary signal is a discrete sequence of length N, expressed as:

[0095] x N ( n ) = Σ i = 1 a S Fi ( n ) + Σ j = 1 b S Hj ( n ) + n ( n ...

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Abstract

The present invention provides a method and system for secondary users to detect cognitive radio spectrum, the method includes: Step 101) According to the difference of frequency hopping signal power spectrum over time, calculate The difference between the actual power spectrum and the average power spectrum of the data, thereby offsetting the fixed-frequency interference power spectrum and retaining the frequency-hopping signal power spectrum; step 102) performing inverse Fourier transform on the retained frequency-hopping signal power spectrum to obtain the autocorrelation function , and then use the time-domain autocorrelation algorithm to detect the frequency band containing burst fixed-frequency interference. Since the time-domain autocorrelation algorithm in the prior art does not consider the case of sudden fixed-frequency interference, that is, only considers a single signal superimposed with Gaussian white noise, the detection accuracy is very low. However, the improved time-domain autocorrelation detection method in the present invention takes into account the impact of sudden fixed-frequency interference on the detection result, thus making the detection accuracy higher.

Description

technical field [0001] The present invention relates to the field of cognitive radio spectrum sensing, in particular to a method and system for secondary users to detect cognitive radio spectrum. Background technique [0002] With the rapid development of wireless communication technology, spectrum resources are becoming increasingly tight. Especially with the development of wireless local area network (WLAN) technology and wireless personal area network (WPAN) technology, more and more people access the Internet wirelessly through these technologies. Most of these network technologies work in the unlicensed frequency band (UFB). Due to the rapid development of WLAN and WPAN wireless communication services, the unlicensed frequency bands used by these networks have gradually become saturated. And other communication services (such as TV broadcasting services, etc.) require the communication network to provide certain protection, so that they are free from interference from...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B17/345H04B17/382H04B1/715
Inventor 王树彬刘萨日娜王洪月刘慧琴
Owner INNER MONGOLIA UNIVERSITY
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