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Energy detection method based on double-threshold power spectrum double-average ratio

An energy detection and power spectrum technology, applied in the field of cognitive radio, can solve the problem that the power spectrum double average ratio algorithm cannot calculate the high false alarm rate, and achieve the effect of improving performance and robustness, and improving detection performance.

Inactive Publication Date: 2019-12-20
CHANGCHUN UNIV OF SCI & TECH
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Problems solved by technology

[0004] The present invention provides a detection algorithm based on double-threshold power spectrum double-average ratio energy detection method, which adds another algorithm for processing between the double-thresholds, improves the processing efficiency of the algorithm, and solves the problem of noise uncertainty caused by spectrum sensing At the same time, it solves the problem that the high false alarm rate of the power spectrum double average ratio algorithm cannot be calculated, which can significantly improve the detection performance of energy detection

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  • Energy detection method based on double-threshold power spectrum double-average ratio

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specific Embodiment approach 1

[0016] Specific implementation mode 1. Combination Figure 1 to Figure 5 Description of this embodiment, based on the double-threshold power spectrum double-average ratio energy detection method, includes the following steps:

[0017] Step 1. Calculate the double threshold γ under the double threshold energy detection 0 and gamma 1 ;

[0018] In the cognitive radio spectrum sensing model, the model of whether the primary user (Primary User, PU) exists can be established as a binary hypothesis test, and the formula is described as follows:

[0019]

[0020] Among them, x(n) represents the transmitted signal, y(n) is the signal received by the receiver, h is the channel gain during signal transmission, and v(n) is the additive white Gaussian noise in the AWGN channel, the channel mean u h = 1, variance h 0 Indicates that the primary user does not use the detection frequency band, so the receiver only receives the noise signal, H 1 It means that the primary user is usi...

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Abstract

The invention discloses an energy detection method based on a double-threshold power spectrum double-average ratio, and relates to the technical field of cognitive radio, and the method comprises thesteps: 1, calculating double thresholds and a detection statistics TDTED under double-threshold energy detection, judging whether the detection statistics TDTED is greater than a lower threshold gamma0 and less than an upper threshold gamma 1 or not, and if not, executing the step 2; if so, executing the step 3; 2, judging whether the detection statistics TDTED is greater than or equal to an upper threshold gamma 1 or not, if so, determining that the PU signal exists, and if not, determining that the detection statistics TDTED is less than a lower threshold gamma 0, and determining that the PU signal does not exist; 3, calculating the maximum value and the minimum value of the power spectrum, the test statistics TDPSRA and the threshold value gamma DPSRA by adopting a power spectrum double average ratio algorithm; and 4, judging whether the test statistics TDPSRA is greater than or equal to a threshold gamma DPSRA, if so, determining that the PU signal exists, and if not, determiningthat the PU signal does not exist. According to the invention, another detection algorithm for processing is added between double thresholds, so that the processing efficiency of the algorithm is improved, and the detection performance of energy detection can be remarkably improved.

Description

technical field [0001] The invention relates to the field of cognitive radio technology, in particular to an energy detection method based on double-threshold power spectrum double-average ratios. Background technique [0002] With the rapid development of communication networks and the explosive growth of business requirements, especially the emergence of highly dense heterogeneous networks such as the fifth generation (5G) wireless communication systems, how to properly solve the serious shortage of wireless spectrum resources is an important task. Challenging tasks. As we all know, the current spectrum management organization allocates most of the spectrum bandwidth to exclusive authorized users (Primary Users, PUs), and does not allow secondary users (Secondary Users, SUs) to access the spectrum bandwidth. The spectrum bandwidth allocated to PUs is not utilized most of the time. Therefore, in order to improve the utilization of spectrum resources, the concept of Cognit...

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Application Information

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IPC IPC(8): H04B17/382H04W16/14
CPCH04W16/14H04B17/382Y02D30/70
Inventor 张晨洁郭滨白雪梅张诗豪陈亮耿小飞胡汉平汤云琪李哲
Owner CHANGCHUN UNIV OF SCI & TECH
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