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Cooperation spectrum perception method under Nakagami-m fading channel

A fading channel and cooperative spectrum technology, applied in the field of cooperative spectrum sensing under Nakagami-m fading channel, can solve the problem that the decision criterion needs to be improved, and achieve the improvement of spectrum utilization efficiency and rationality, increase the correct spectrum perception rate, and improve the detection probability. Effect

Inactive Publication Date: 2012-06-27
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

[0004] The purpose of the present invention is to provide a cooperative spectrum sensing method under the Nakagami-m fading channel, to solve the problem that the existing cooperative spectrum sensing method only applies to a single multipath fading channel and the decision criterion adopted by the fusion center needs to be improved

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  • Cooperation spectrum perception method under Nakagami-m fading channel
  • Cooperation spectrum perception method under Nakagami-m fading channel
  • Cooperation spectrum perception method under Nakagami-m fading channel

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[0013] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0014] In order to solve the problems existing in the existing cooperative spectrum sensing method, the present invention proposes a cognitive radio cooperative spectrum sensing method under the condition of Nakagami-m fading channel. Nakagami-m fading covers a wide range of multipath fading channels. By changing the fading parameter m, different multipath fading channels can be simulated. In the present invention, each cognitive user still uses an energy detection method to detect the occ...

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Abstract

The invention brings forward a cooperation spectrum perception method under Nakagami-m fading channel condition. In the invention, the perception efficiency of a user to authorization spectrum is raised through two links. In the first link, at a cognition user, a realized adaptive equalizer based on an improved reverse direction propagation nerve network is introduced, and the cognition user sends a received signal which passes through a fading channel to the adaptive equalizer for processing so as to raise the quality of the received signal. In the second link, at a data fusion center, idea of a Chair-Varshney criterion is used for an improvement algorithm of a decision criterion, and a BP nerve network based on an L-M algorithm is employed for realization. The related nerve network structures of the above two links can be subjected to adaptive adjustment according to a form of a Nakagami-m fading channel, through improvement of the two links, spectrum correct perception rate of the user can be effectively raised, and authorization spectrum resource can be used more reasonably and effectively.

Description

technical field [0001] The invention belongs to the field of cognitive radio technology, and in particular relates to a cooperative spectrum sensing method under a Nakagami-m fading channel. Background technique [0002] Cognitive radio is an intelligent spectrum sharing technology. The wireless terminal has sufficient intelligence or cognitive ability to detect, analyze, learn, reason and plan the history and current conditions of the surrounding wireless environment, and use the corresponding results Automatically adjust relevant transmit parameters or receive parameters. One of the key technologies to realize cognitive radio is spectrum sensing, which is also a prerequisite for cognitive users to share spectrum with licensed users. Under multipath fading channel conditions, due to the low signal-to-noise ratio of the received signal, it is difficult for a single cognitive node to obtain accurate spectrum hole information. Sensing methods, such as "Opportunistic Spectrum...

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Application Information

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IPC IPC(8): H04B17/00H04W24/00H04B17/382
Inventor 王丽娜王兵刘逸马瑞宽
Owner UNIV OF SCI & TECH BEIJING
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