Broadband spectrum sensing method based on spectrum characteristics

A spectrum feature, broadband spectrum technology, applied in the field of spectrum sensing of cognitive radio, to achieve the effect of good detection performance, accurate signal characteristics, strong anti-interference ability

Active Publication Date: 2017-12-26
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, in actual CS applications, the influence of fading channels makes the interference irregular and cannot be taken into account

Method used

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  • Broadband spectrum sensing method based on spectrum characteristics
  • Broadband spectrum sensing method based on spectrum characteristics
  • Broadband spectrum sensing method based on spectrum characteristics

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Embodiment Construction

[0031] The invention will be described in further detail below in conjunction with the accompanying drawings.

[0032] Such as figure 1 As shown, the present invention provides a method based on spectrum feature detection in wideband spectrum sensing, the method includes as follows:

[0033] 1) System model

[0034] After the wireless signal passes through the single-path Rayleigh fading channel, the signal after adding additive Gaussian white noise and interference is x(t).

[0035] y(t)=α(t)x(t)+i(t)+n(t) formula (1)

[0036] x(t) is the transmitted signal; n(t) is additive Gaussian white noise; i(t) is interference; α(t) is the fading factor of the wireless channel, which can be expressed by formula (2):

[0037]

[0038] In formula (2) Indicates the transmission loss, and ζ(t) is the random process of Rayleigh fading.

[0039] Assume that the actual occupancy location of the main user is in the grid on, set Represents the set of possible frequency positions of t...

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Abstract

The invention discloses a broadband spectrum sensing method based on spectrum characteristics, and belongs to the field of spectrum sensing of cognitive radios. According to the method, by signal spectrum characteristic detection the frequency band occupied by a master user is detected, and power level is estimated. According to the characteristic of low practical use ratio of spectrum resources, possible frequency positions and corresponding power value level are estimated, a Rayleigh fading channel model is added to an original model without a fading channel to solve the Rayleigh fading channel, a WOMP (weighted orthogonal matching pursuit) algorithm serves as a signal reconstruction algorithm for estimating the signal power value level and frequency occupation by the aid of technology based on the spectrum characteristics.

Description

technical field [0001] The invention relates to a broadband spectrum sensing method based on spectrum characteristics, and belongs to the technical field of spectrum sensing (Spectrum Sensing, SS) of cognitive radio (Cognitive Radio, CR). Background technique [0002] Existing regulations based on monopolizing specific licensed frequency bands within specific geographic areas are inefficient because the allocated spectrum is underutilized. In order to improve the utilization efficiency of the current scarce spectrum resources, the spectrum management system is moving towards a more intelligent and flexible direction. In this context, cognitive radio technology has been promoted. CR solves the problem of limited spectrum resources by giving unlicensed systems the opportunity to utilize unused licensed frequency bands. Among the various technologies of CR, the spectrum sensing technology can be used to detect the existence of licensed users on a certain frequency band. Spec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/382H04B17/391
CPCH04B17/382H04B17/3911
Inventor 齐丽娜李婷婷
Owner NANJING UNIV OF POSTS & TELECOMM
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