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Transient polarization spectrum sensing method based on time-frequency analysis

A transient polarization and spectrum sensing technology, applied in transmission monitoring, electrical components, transmission systems, etc., can solve the problem of ignoring the polarization characteristics of broadband signals, failing to meet the spectrum sensing requirements of cognitive radio networks, and having no polarization sensing of broadband signals Mining and utilizing problems to achieve the effect of improving perception performance

Inactive Publication Date: 2020-12-29
BEIJING INFORMATION SCI & TECH UNIV
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Problems solved by technology

The above studies are based on the polarization information of narrowband signals and have achieved good detection performance in narrowband spectrum sensing. However, the polarization characteristics of wideband signals have been ignored, and the polarization sensing of wideband signals has not been mined and utilized, which cannot meet the requirements of cognitive radio. Spectrum Sensing Requirements for Networks

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  • Transient polarization spectrum sensing method based on time-frequency analysis
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  • Transient polarization spectrum sensing method based on time-frequency analysis

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Embodiment Construction

[0022] In order to enable those skilled in the art to understand and implement the present invention more clearly, the technical solutions of the embodiments of the present invention will be described in detail below in the form of specific embodiments in conjunction with the accompanying drawings.

[0023] refer to figure 1 , shows the cognitive radio network model of the present invention, the network includes:

[0024] A cognitive communication link, including a cognitive user transmitter and a cognitive user receiver, and an authorized communication link, including an authorized user transmitter and an authorized user receiver;

[0025] The authorized user transmitter sends the authorized signal in a fixed polarization state on the given authorized spectrum, and both the authorized user receiving end and the cognitive user receiving end can receive the authorized signal;

[0026] Cognitive users use the difference in the statistical characteristics of the received license...

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Abstract

The invention discloses a transient polarization spectrum sensing method based on time-frequency analysis, which utilizes transient polarization short-time Fourier transform to obtain time-frequency domain transient polarization information, enables a cognitive user to access an authorized spectrum on the premise of avoiding interference to the authorized user, and is applied to a cognitive radionetwork. According to the method, an instantaneous polarization short-time Fourier transform method is adopted, a two-dimensional polarization vector signal is converted into a four-dimensional time-frequency domain transient Stokes vector, whether an authorized user signal exists or not is judged according to the difference of statistical correlation between the authorized user signal and noise,interference to the authorized user is reduced, normal work of the authorized user is guaranteed, the cognitive user is supported to access the authorized spectrum, and the spectrum efficiency is high.

Description

technical field [0001] The invention belongs to the field of wireless communication, relates to a cognitive radio network system, and in particular to a cognitive radio spectrum sensing method. Background technique [0002] Cognitive radio technology is a technology to improve spectrum efficiency in the background of low spectrum utilization due to fixed spectrum allocation mechanism. In a cognitive radio network, cognitive users detect the surrounding communication environment, perceive the usage status of the licensed spectrum of the licensed user, use the idle licensed spectrum for data transmission, or communicate in a transmission mode that is lower than the interference threshold of the licensed user . Spectrum sensing is the basis of cognitive radio. Spectrum sensing means that the cognitive user judges whether the licensed spectrum is occupied based on the difference between the licensed signal and the noise, accesses the licensed spectrum if the licensed spectrum ...

Claims

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Application Information

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IPC IPC(8): H04B17/382
CPCH04B17/382
Inventor 陈硕
Owner BEIJING INFORMATION SCI & TECH UNIV
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