Spectrum sensing and information transmission method with energy collection in cognitive wireless network

Abstract

The invention discloses a spectrum sensing and information transmission method with energy collection in a cognitive wireless network, comprising the following steps that: a cognitive user utilizes signals from a main user transmitter for spectrum sensing and energy collection, and uses the collected energy for information transmission; in detecting the main user phase, the cognitive user and N cognitive relays jointly detect whether the main user occupies the spectrum; in the reporting phase, the cognitive user activates the energy collection or information fusion function according to whether it detects that the main user is occupying the spectrum; and in the information transmission phase, the cognitive user performs energy collection or information transmission according to the spectrum sensing final decision result. The invention provides working energy for cognitive users, prolongs the service life of cognitive users, and reduces or eliminates periodic battery replacement while obtaining high spectrum sensing performance.

Description

technical field [0001] The invention relates to a spectrum sensing and information transmission method with energy collection in a cognitive wireless network, and belongs to the technical field of cognitive radio. Background technique [0002] Traditional wireless communication uses a fixed spectrum allocation method. The government allocates these resources to authorized users or serves a large geographical area for a long time, but the utilization rate of these authorized spectrum is very low. Cognitive radio (cognitive radio) can solve the contradiction between the increasing demand for spectrum and the scarcity and low utilization of spectrum. It allows an unlicensed user (Secondary User, also called a cognitive user) to access spectrum of an authorized user (Primary User, also called a primary user). Among them, the cognitive user uses the spectrum sensing technology to detect the use of spectrum by the primary user to find spectrum holes (spectrum holes) not used by t...

AI Technical Summary

Problems solved by technology

[0004] However, if the RF signal energy transmitted by the primary user is allocated proportionally by the cognitive nodes and then spectrum sensing and energy collection are performed simultaneously, the energy used for spectrum sensing will be reduced because the power allocation ratio is less than 1.

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