Multi-task cooperative spectrum sensing method based on Stackelberg game

Abstract

The invention provides a multi-task cooperative spectrum sensing method based on a Stackelberg game, which comprises the following steps: constructing a multi-task cooperative spectrum sensing systemmodel based on a Stackelberg game, and respectively modeling a fusion center and a secondary user as a leader and a slave; determining a secondary user set participating in the perception task of eachfrequency band; for any task in the frequency band set and the secondary user set in which the frequency band participates, the fusion center issuing initial reward; calculating the utility of a secondary user, and determining the perception time based on a utility maximum principle; the secondary user performing frequency band perception within the perception time and transmits perception data to the fusion center; calculating the effectiveness of the fusion center, and updating the reward according to the maximum effectiveness principle until the effectiveness value of the fusion center isunchanged to obtain a final judgment result. According to the method, in a leader game, a fusion center issues an optimal reward value to a secondary user. In the slave game, the influence of the residual energy on the secondary user is emphatically considered, and the secondary user changes the perception time under the reward to obtain the optimal effectiveness.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a multi-task cooperative spectrum sensing method. Background technique [0002] With the increasing demand of users for high-speed data transmission, the problem of scarcity of spectrum resources is becoming more and more serious. Due to the very low spectrum efficiency of the traditional fixed spectrum allocation method, dynamic spectrum access technology and cognitive radio (CR) emerged as the times require. , aiming to solve the problem of spectral inefficiency. In cognitive radio, the secondary user is allowed to use the radio resources of the primary user when the primary user is idle, so it is necessary to perform spectrum sensing on the spectrum of the primary user. The secondary user senses the authorized frequency band of the primary user to obtain the spectrum occupancy. However, when the signal-to-noise ratio is very low, the single-user detection pe...

AI Technical Summary

Problems solved by technology

It can be seen that there is still room for improvement in the existing methods for the detection efficiency of the fusion center and the utility guarantee between the secondary user and the fusion center, so a new spectrum sensing method in multi-spectrum scenarios is needed

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