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Spectrum sensing method and device

A spectrum sensing and frequency band technology, used in transmission monitoring, electrical components, transmission systems, etc., can solve the problems of low spectrum sensing efficiency, high algorithm complexity, and increase algorithm complexity, and achieve the goal of reducing algorithm complexity and improving efficiency. Effect

Inactive Publication Date: 2016-06-29
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

Although cyclic spectrum detection and energy detection do not need to obtain prior information of the signal, the complexity of the algorithm is high, and the efficiency of spectrum sensing is low
For example, taking energy detection as an example, energy detection requires noise estimation in advance, which will increase the complexity of the algorithm

Method used

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Embodiment Construction

[0041] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0042] Embodiments of the present invention provide a spectrum sensing method and device. Specifically, firstly, according to preset rules, samples in a target frequency band are sampled to obtain N sampled signals; and then according to the obtained N sampled signals, the The variance of the phase differences of the N sampled signals; according to the obtained variance and the preset decision threshold, it is determined whether the ta...

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Abstract

The embodiments of the invention disclose a spectrum sensing method and device. The method comprises the steps of sampling signals in a target band according to a preset rule to obtain N sampled signals; according to the obtained N sampled signals, acquiring the variance of phase differences of the N sampled signals; and determining whether the target band is occupied or not according to the acquired variance and a preset judgment threshold. By adopting the method and the device, prior information of the signals does not need to be acquired, noise also does not need to be previously estimated, and the band can be sensed only by using the variance of phase differences in the band, so that the algorithm complexity is effectively reduced, and the spectrum sensing efficiency is improved.

Description

technical field [0001] The present invention relates to the field of wireless communication technologies, and in particular, to a spectrum sensing method and device. Background technique [0002] Spectrum sensing means that cognitive users obtain spectrum usage information in wireless networks through various signal detection and processing methods. Spectrum sensing, as one of the key technologies of cognitive radio, allows unlicensed users to opportunistically access unused licensed frequency band resources, thereby greatly improving spectrum utilization, with lower deployment costs and better compatibility. [0003] At present, there are three main methods of spectrum sensing, namely energy detection, cyclic spectrum detection and matched filter detection. Matched filter detection needs to obtain a priori information of the signal (for example, modulation mode, pulse waveform, etc.), which is unlikely to be implemented in practical applications. Although the cyclic spect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/382
CPCH04B17/382
Inventor 冯志勇张轶凡鲍大志付璇王雪安刘少杰
Owner BEIJING UNIV OF POSTS & TELECOMM
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