Spectrum detection method of cognitive radio system

A cognitive radio and spectrum detection technology, applied in transmission systems, electrical components, transmission monitoring, etc., can solve problems such as the failure of authorized user receivers to receive and demodulate normally, and achieve the effect of improving spectrum utilization

Inactive Publication Date: 2011-06-08
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that when the existing spectrum detection method detects the existence of the authorized user signal under the condition of very low signal-to-noise ratio, if the authorized us

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  • Spectrum detection method of cognitive radio system
  • Spectrum detection method of cognitive radio system
  • Spectrum detection method of cognitive radio system

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with specific examples.

[0026] In order to facilitate the understanding of the embodiments, the spectrum detection based on the absolute value method of the covariance matrix is ​​first explained: the received signal after the analog-to-digital conversion is a series of discrete data (digital signals), which are required by the signal detection algorithm The sample value of is represented by the symbol x(n), where n is a positive integer representing the nth data sample received. L consecutive data samples constitute the transpose of vector X(n), expressed as formula (1), where N s Represents the total number of data samples, and L is defined as a smoothing factor.

[0027] X(n)=[x(n) x(n-1)...x(n-L+1)] T , n=0,1,...N s -1 formula(1)

[0028] Use the obtained vector X(n) to construct the covariance matrix R x (N s ) is expressed as formula (2):

[0029] R x ...

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Abstract

The invention discloses a spectrum detection method of cognitive radio system, comprising the following steps: calculating the signal energy of each cognitive node; performing spectrum detection judgment on each cognitive node; and carrying out united judging on the spectrum detection of a centre node. By the method disclosed by the invention, the frequency spectrum detection is performed on the centre node via performing the spectrum detection on each cognitive node and using the signal energy value of each cognitive node; when an authorized user signal is detected under quite low signal to noise ratio, simultaneously, whether an authorized user receiver normally receives and demodulates or not also can be detected. Therefore, during practical application, the cognitive radio system can improve the frequency spectrum utilization better under the condition of ensuring the detection performance and without interfering the normal receiving of the authorized user.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a frequency spectrum detection method used in a cognitive radio system. Background technique [0002] With the rapid development of wireless communication technology, multiple wireless communication access methods coexist, and the number of wireless users increases sharply, which leads to increasingly tight radio spectrum resources. As a precious non-renewable resource, the radio frequency spectrum is currently authorized by the government department. Generally, a specific licensed frequency band (LFB, Licensed Frequency Band) is allocated for different communication services, which can provide good protection for the corresponding communication services. . However, once a specific frequency band is authorized and assigned to a user (authorized user), other unlicensed users (secondary users) can no longer use the frequency band, even if the licensed frequency b...

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Application Information

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IPC IPC(8): H04B17/00H04B17/382
Inventor 杨松陈亚丁李洪宇王军李少谦
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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