Self-adapted cooperative frequency spectrum sensing method and system based on optimal relaying

Abstract

The invention discloses a self-adapted cooperative frequency spectrum sensing method and system based on optimal relaying. The method combines perception performances and perception energy consumption. The working process of the system is divided into independent perception, relaying selection, transmission and fusion, and a feedback phase, wherein in the independent perception, each perceiving user independently receives a main user signal and judges whether relaying assistance is needed or not according to a possibility relaying threshold; in the relaying selection, a non-relaying user selects optimal relaying meeting a certain condition according to a benefit function, and cooperates to carry out local judgment; in the transmission and fusion, the perceiving user meeting the condition transmits a local judgment result to a fusion center, and an overall result is judged by the fusion center; in the feedback phase, corresponding information is fed back according to a whole perception condition of the system and the system parameters are adjusted.

Description

technical field [0001] The invention relates to an adaptive cooperative spectrum sensing method and system based on an optimal relay, and belongs to the technical field of computer wireless communication. Background technique [0002] Computer wireless communication and personal communication have developed rapidly in the past few decades, and various system structures, protocol standards and network architectures have emerged in an endless stream. With the rapid growth of wireless communication services, the contradiction between the increasing spectrum demand and limited spectrum resources has become one of the main bottlenecks restricting the development of wireless communication. In addition to the allocation of very few ISM open frequency bands, most of the current frequency use policies in the world adopt a license system, that is, authorized users use the specified frequency bands, and non-authorized users are not allowed to use them. And studies have shown that the ...

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Problems solved by technology

[0005] The purpose of the present invention is to propose an adaptive cooperative spectrum sensing method based on the optimal relay for the problems of fading of the sensing channel and high energy consumption of the relay in the existing cognitive system. The optimal relay cooperation of the benefit function and the adaptive adjustment mechanism of the system parameters obtain an optimized compromise between performance and energy consumption

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