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Double-stage blind spectrum sensing scheme

A spectrum sensing, two-stage technology, applied in the field of cognitive radio, can solve problems such as high sensing complexity, and achieve the effect of reducing the probability of false alarms, improving reliability, and improving throughput

Active Publication Date: 2018-08-14
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

Compared with energy detection, covariance matrix detection requires higher perceptual complexity

Method used

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Embodiment Construction

[0034] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0035] Because the traditional blind spectrum sensing scheme is only suitable for specific environments, such as energy detection is suitable for high signal-to-noise ratio environments and the complexity of the covariance matrix detection algorithm is relatively high. The present invention proposes a two-stage spectrum sensing scheme (abbreviated as ED-CMM). When the SNR is at a high level, the energy detection method is used to detect the spectral hole; when the SNR is at a low level, the spectrum sensing method based on the covariance matrix is ​​used to sense the target frequency band. In addition, the present invention provides an evaluation scheme of signal-to-noise ratio in a cognitive wireless environment, which i...

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Abstract

The invention discloses a double-stage blind spectrum sensing method by making full use of the advantages of a single spectrum sensor. The method comprises the following steps: detecting a spectrum hole by using an energy detection method in the case that the signal to noise ratio is high according to the signal to noise ratio in an evaluated radio environment; and determining the occupation condition of a target frequency band by using a covariance matrix detection method in the case that the signal to noise ratio is low. Therefore, the effectiveness and reliability of the spectrum sensing are greatly improved.

Description

technical field [0001] The present invention relates to the field of cognitive radio technology, in particular to a cognitive radio spectrum sensing method. Background technique [0002] With the rapid development of wireless communication technology and the low spectrum utilization of registered frequency bands, radio spectrum has become a scarce resource. To this end, Dr. Joseph Mitola proposed cognitive radio technology, which allows unauthorized users (secondary users) to use the frequency band for their own communication when authorized users (primary users) do not occupy the frequency band. The key technologies of cognitive radio mainly include spectrum sensing, spectrum allocation, spectrum decision-making, and spectrum sharing. Spectrum sensing is the core technology of Cognitive Radio (CR), and its main purpose is to detect whether the target frequency band is free. Perception accuracy and perception complexity determine the performance of a cognitive radio device...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W16/14
CPCH04W16/14
Inventor 景晓军穆俊生黄海
Owner BEIJING UNIV OF POSTS & TELECOMM
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