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A Cognitive Radio Cooperative Spectrum Sensing Method Based on User Aggregate Potential Estimation

A technology of user set and covariance matrix, applied in the field of cognitive radio, can solve the problem of insufficient spectrum sensing performance, and achieve the effect of improving the sensing performance and benefiting the sensing performance

Active Publication Date: 2019-04-30
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0006] Aiming at the problem that the traditional cooperative spectrum sensing method needs prior information and the spectrum sensing performance is insufficient in the case of low signal-to-noise ratio, the present invention proposes a cooperative spectrum sensing scheme based on user aggregate potential estimation

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  • A Cognitive Radio Cooperative Spectrum Sensing Method Based on User Aggregate Potential Estimation
  • A Cognitive Radio Cooperative Spectrum Sensing Method Based on User Aggregate Potential Estimation
  • A Cognitive Radio Cooperative Spectrum Sensing Method Based on User Aggregate Potential Estimation

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Embodiment Construction

[0018] In the actual sensing environment, the channel conditions of each SU participating in cooperative sensing are different. Generally, the received signal covariance matrix R s The first K eigenvalues ​​of , may be much larger than the last (M-K) eigenvalues ​​(the received signal covariance matrix has M eigenvalues), that is, λ 1 ≥λ 2 ≥…≥λ K >>λ K+1 ≥…≥λ M , where a larger eigenvalue indicates that the corresponding SU users have better channel conditions and can receive stronger PU signals. Therefore, in this sense, the M SUs participating in cooperative sensing can be divided into users with better channel conditions A set and a set of users with poor channel conditions. Consider using AIC (Akaike Information Criterion), MDL (Minimum Description Length), GAIC (Gerschgorin Akaike Information Criterion), GMDL (Gerschgorin Minimum Description Length), BIC (Bayesian Information Criterion), GBIC (Generalized Bayesian Information Criterion), EEF (Exponentially Embedded F...

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Abstract

The invention relates to the field of cognitive radio spectrum sensing technology, and discloses a cognitive radio cooperative spectrum sensing method, namely provides an effective and feasible cooperative spectrum sensing method based on user set potential estimation and a weighted gain combining mechanism. The method comprises the following steps: firstly, estimating a user set potential by employing an estimation algorithm, and determining the number of optimal users participating in the generation of GTS at last; and secondly, improving the sensing performance of weighted gain combining and cooperative spectrum sensing based on a user selection mechanism. The cognitive radio cooperative spectrum sensing method based on the user set potential estimation can be used for reducing the dependence of the cooperative sensing on prior information, as well as effectively solving the problem that whether an authorized frequency band is occupied is difficult to distinguish under the condition of a low signal to noise ratio and greatly improving the cooperative spectrum sensing performance.

Description

technical field [0001] The invention belongs to the field of cognitive radio (Cognitive Radio, CR), and in particular relates to cognitive radio cooperative spectrum sensing technology. Background technique [0002] Cognitive radio is committed to solving the problems of spectrum resource shortage and spectrum waste caused by the traditional fixed spectrum authorization allocation method, and can realize the secondary user SU (secondary user) in the licensed frequency band LFB (licensed frequency bands) with low priority opportunities dynamic access. As the basic premise of cognitive radio, spectrum sensing technology has been extensively studied. Its purpose is to accurately and quickly make a judgment on the real-time occupancy status of LFB, so that SU can interfere and affect PU (primary user) as little as possible. Under the circumstances, wait for an opportunity to access the licensed frequency band. [0003] Early classic single-user spectrum sensing schemes include...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B17/382
CPCH04B17/382
Inventor 申滨高凯黄晓舸陈前斌
Owner CHONGQING UNIV OF POSTS & TELECOMM
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