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Spectrum sensing method based on Bayes criterion and energy detection method

A technology of energy detection and spectrum sensing, applied in the field of spectrum sensing, to achieve good sensing performance, good spectrum sensing performance, and simple operation

Inactive Publication Date: 2017-05-31
NINGBO UNIV
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a spectrum sensing method based on Bayesian criterion and energy detection method, which takes into account the uncertainty of noise power caused by the interference environment, by estimating the noise power received by the sensing user distribution, combined with Bayesian criterion to reduce the impact of noise power uncertainty on spectrum sensing performance

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  • Spectrum sensing method based on Bayes criterion and energy detection method
  • Spectrum sensing method based on Bayes criterion and energy detection method
  • Spectrum sensing method based on Bayes criterion and energy detection method

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[0019] The present invention will be further described in detail below in conjunction with the embodiments of the drawings.

[0020] The present invention proposes a spectrum sensing method based on Bayesian criterion and energy detection method, and its implementation flow diagram is as follows figure 1 As shown, it includes the following steps:

[0021] ① In the cognitive radio system, there are multiple perceptual users and multiple authorized users; one perceptive user is regarded as the current perceptive user; the current perceptive user is used to sample the signal in the monitoring channel N times to obtain N sampling points For the sampling signal formed by the signal, the n-th sampling point signal in the sampling signal is denoted as x(n); where, N≥2, in this embodiment N=1000, 1≤n≤N.

[0022] ②According to all the sampling point signals in the sampling signal corresponding to the current perception user, calculate the test statistics, denoted as T, Among them, the symbol...

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Abstract

The invention discloses a spectrum sensing method based on a Bayes criterion and an energy detection method. The method comprises the steps of sampling signals in a monitoring channel by a current sensing user, thereby obtaining sampling signals; obtaining detection statistic quantity according to all sampling point signals in the sampling signals and carrying out estimation to obtain distribution of noise power of the current sensing user according to all sampling point signals in the sampling signals; obtaining an accumulated distribution function of the distribution of the noise power of the current sensing user according to the distribution of the noise power of the current sensing user; on the basis of the Bayes criterion and the energy detection method, calculating a judgment threshold according to the accumulated distribution function under the condition that a target false alarm probability is set; and finally, judging whether an authorized user signal exists in the monitoring channel or not by comparing the detection statistic quantity with the judgment threshold. The method has the advantages that influences of noise power uncertainty on the spectrum sensing performance can be reduced well, and the good spectrum sensing performance is obtained.

Description

Technical field [0001] The invention relates to a spectrum sensing technology in a cognitive radio system, in particular to a spectrum sensing method based on Bayes criterion and energy detection method. Background technique [0002] With the rapid development of wireless communications, wireless communications users and their business needs continue to grow, and the services provided by wireless communications have expanded from simple low-speed voice to high-speed multimedia data applications. Therefore, the available wireless spectrum has become an indispensable limited natural resource in modern society. On the one hand, human demand for wireless spectrum is increasing; on the other hand, the wireless spectrum resources available for human use are extremely limited, and the contradiction between the two has played a certain role in hindering the development of wireless communication. In order to find a way to alleviate the shortage of wireless spectrum resources, relevant re...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/382H04B17/309
CPCH04B17/309H04B17/382
Inventor 童景文金明
Owner NINGBO UNIV
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