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Iterative cooperative spectrum sensing method

A technology of collaborative spectrum and detection method, which is applied in the field of spectrum detection, can solve the problems of time consumption, energy and spectrum, and achieve the effects of improving detection performance, saving energy, and high detection probability

Inactive Publication Date: 2011-07-27
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

In ordinary cooperative detection, the more cognitive users, the higher the detection probability, but there is a defect that the more cognitive users, because the cognitive users transmit local judgment results to the judgment center through TDMA, when the recognition When there are too many users, the transmission and decision process consumes a lot of time, energy and spectrum

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Embodiment Construction

[0023] The present invention will be described in detail below with reference to the drawings and specific embodiments.

[0024] The present invention provides an iterative detection model diagram and a transceiver mode diagram, which are combined below figure 1 , figure 2 In detail, the transceiver mode of the present invention is mainly aimed at the detection of the authorized user when the authorized user does not exist. When the authorized user is detected, the transceiver mode becomes the pure detection mode. Under the assumption that the authorized user does not exist at the current moment, the spectrum detection is performed according to an iterative detection model. It mainly includes the following steps:

[0025] Step 1: Know User U 1 , U 2 Joint detection of available frequency band f 1 And combine the detection result and the received signal power P 1 , P 2 Inform the decision center, the decision center determines the iteration order and number of iterations according...

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Abstract

The invention discloses an iterative cooperative spectrum sensing method, which aims to solve the problem that time, energy and spectrum are greatly consumed in transmission and judgment processes when the number of cognitive users is over-great in the conventional cognitive radio spectrum sensing process. In the method, authorized users are judged whether to be in an active state or not by iterative sensing according to judgment results of a judgment center at past moments and the judgment result of a cognitive node at a current moment so as to realize high sensing probability by the two cognitive users; the iterative sensing improves the sensing performance of a system, and gradually increases the sensing probability as time goes by; and only one cognitive user senses the authorized users at each sensing moment except a first moment, so the number of the used cognitive users can be saved by a half.

Description

Technical field [0001] The invention belongs to the technical field of cognitive radio, and particularly relates to a spectrum detection method in cognitive radio. Background technique [0002] With the development of wireless communication technology and continuous expansion of wireless applications, the lack of spectrum resources has become a problem that has to be faced in the process of wireless application research. The current spectrum management strategy is based on a static control model. The management agency divides the available spectrum resources into fixed, non-overlapping spectrum blocks, and divides them by guard bands, and allocates these spectrum blocks to different services and technologies in an exclusive manner, such as: mobile communication operators, broadcasting Television, military and public safety departments. [0003] In order to solve the aforementioned problem of low spectrum utilization, a new spectrum usage mode called Cognitive Radio (CR) is gradua...

Claims

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Application Information

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IPC IPC(8): H04B17/00H04B17/382
Inventor 熊文汇董彩萍王振伟刘伟光李少谦
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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