Physical layer secure transmission method in unmanned aerial vehicle assisted cognitive wireless network

Abstract

The invention provides a physical layer secure transmission method based on an unmanned aerial vehicle assisted cognitive wireless network, and belongs to the field of wireless communication. The method specifically comprises the following steps: establishing a wireless communication scene comprising an unmanned aerial vehicle, a primary user transmitter, a primary user receiver, a secondary userreceiver and an eavesdropper, and then, in a frequency spectrum sensing time tau of a time slot T, enabling the unmanned aerial vehicle to perform spectrum sensing, wherein the main user may perform data transmission, and calculates the safe transmission rate at the moment; meanwhile, in the data transmission time period Ta of the time slot T, enabling the unmanned aerial vehicle to judge the access state of the current main user channel based on spectrum sensing, selecting the current main user channel as a friendly interference unit or a secondary signal transmitter, and discussing a securetransmission model in four situations; based on this, formulating an optimization model of the total secure transmission rate; performing solving by using a particle swarm optimization algorithm; andenabling the unmanned aerial vehicle to perform signal physical layer safety transmission according to the obtained optimal parameters. According to the invention, the secure transmission of the primary and secondary users is considered, so that the secure transmission performance of the system is improved.

Description

Technical field[0001]The present invention belongs to the field of wireless communication, and in particular, the present invention relates to a physical layer safety transmission method based on the drone auxiliary cognitive wireless network.Background technique[0002]In recent years, the gradual application of the 5G network has driven the rapid development of the Internet of Things technology, and the terminal equipment used by people has grown a lot of trends in diversified development. However, due to the shortage of shortage of spectrum resources in the communication network, 5G and the development of the Internet of Things technologies are restricted. Therefore, it is necessary to introduce cognitive radio (CR) to improve wireless spectral utilization. Spectrum perception, spectrum sharing, and spectral switching, such as cognitive wireless networks, can effectively realize sharing and multiplexing of wireless spectrum resources, thereby improving the utilization of wireless s...

AI Technical Summary

Problems solved by technology

[0006] Although the existing technologies provide various solutions for the secure transmission of cognitive wireless networks, there are still the following problems: On the one hand, there are few studies on the use of UAVs to transmit artificial noise to ensure the secure transmission of the physical layer of cognitive wireless networks. On the other hand, in the existing studies on secure transmission mechanisms in cognitive wireless networks, less consideration has been given to the impact of changes in channel access status on the performance of secure transmission at the physical layer.

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