Multi-antenna cooperative spectrum sensing method based on information geometry and differential evolution clustering algorithm
A technology of cooperative spectrum sensing and information geometry, applied in the field of multi-antenna cooperative spectrum sensing based on information geometry and differential evolution clustering algorithm, can solve the problems of information loss, complex and imprecise threshold derivation, etc., to reduce the impact and improve the perception. performance, the effect of good perceived performance
Active Publication Date: 2021-08-24
GUANGDONG UNIV OF TECH
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[0005] In order to solve the problem that the spectrum sensing algorithm of the random matrix theory will cause partial information loss when calculating the eigenvalues of the covariance matrix, and at the same time, the threshold derivation of the traditional spectrum sensing is complex and inaccurate, a method based on information geometry and differential evolution is provided. The multi-antenna cooperative spectrum sensing method based on the clustering algorithm does not need to calculate the threshold, and at the same time analyzes the spectrum sensing problem from the perspective of information geometry, retains the information of the original matrix to the greatest extent, and helps to improve the sensing performance
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Embodiment 1
[0078] In actual wireless communication, problems such as multipath attenuation and shadow attenuation usually exist, and it is difficult for a single secondary user to make an accurate judgment on whether the primary user is using the licensed spectrum. Therefore, in order to combat and reduce the impact of channel attenuation on spectrum sensing performance, this embodiment is based on a multi-antenna cooperative spectrum sensing system model, such as figure 1 As shown, multiple users and multiple antennas are used for cooperative spectrum sensing technology. Specifically, this embodiment provides a multi-antenna cooperative spectrum sensing method (PIDMSS) based on information geometry and differential evolution clustering algorithm, such as figure 2 As shown, it includes the following steps:
[0079] S1: According to figure 1 , assuming that there is only one primary user, M cognitive users and one fusion center in the cognitive radio network, and each secondary user pa...
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The invention discloses a multi-antenna cooperative spectrum sensing method based on information geometry and differential evolution clustering algorithm, which includes the following steps: receiving signal X j According to the clustering method, it is divided into two clusters, respectively, and are respectively processed by principal component analysis, and the corresponding covariance matrix R is obtained and constructed. 1 and R 2 ; According to the information geometry extraction signal feature, in the noise environment, carry out cluster processing and principal component analysis processing to P noise signal matrices and obtain and calculate the corresponding Riemann mean value and the covariance matrix R that step S2 obtains 1 and R 2 Mapped to the statistical manifold, and the Riemann mean and the reference point are used to analyze the distance d between points and points respectively 1 and d 2 , get the signal feature T. The technical scheme adopted in the present invention does not need to calculate the threshold, and judges whether the primary user exists through a differential evolution clustering algorithm, thereby having higher judgment accuracy.
Description
technical field [0001] The present invention relates to the field of cognitive radio technology, and more specifically, to a multi-antenna cooperative spectrum sensing method based on information geometry and differential evolution clustering algorithm. Background technique [0002] In recent years, the number of various wireless devices and smart mobile terminals has increased rapidly, people's demand for wireless spectrum is increasing, and the scale of wireless communication networks has continued to expand, which undoubtedly makes spectrum resources increasingly tight. Cognitive radio technology aims to alleviate the current problem of spectrum scarcity. The main idea of cognitive radio technology is to enable radio communication devices to discover free spectrum and make reasonable use of spectrum resources. Spectrum sensing technology is not only one of the important technologies of cognitive radio, but also the basis of other applications such as spectrum sharing a...
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IPC IPC(8): H04B17/382G06K9/62
CPCH04B17/382G06F18/23G06F18/214
Inventor 庄家卫王永华万频罗旗良
Owner GUANGDONG UNIV OF TECH