A physical layer secure transmission method in UAV-assisted cognitive wireless network

Abstract

The invention proposes a physical layer security transmission method in a UAV-assisted cognitive wireless network, which belongs to the field of wireless communication. , and the wireless communication scenario of the eavesdropper, then, within the spectrum sensing time τ of the time slot T, the UAV performs spectrum sensing; the primary user may perform data transmission, and calculate the safe transmission rate at this time; at the same time, in the time slot T data transmission time period T a Inside, the UAV judges the access status of the current primary user channel based on spectrum sensing, chooses to be a friendly jammer or a secondary signal transmitter, and discusses the safe transmission model in four cases; based on this, the optimization model of the total safe transmission rate is formulated ; Use the particle swarm optimization algorithm to solve the problem; the UAV performs the safe transmission of the signal physical layer according to the optimal parameters obtained. The invention considers the safe transmission of primary and secondary users, thereby improving the safe transmission performance of the system.

Description

Technical field [0001] The invention belong to that field of wireless communication, and particularly relates to a physical lay safe transmission method in a cognitive wireless network based on unmanned aerial vehicles. technical background [0002] In recent years, the gradual application of 5G network has driven the rapid development of the Internet of Things technology, and the terminal devices used by people have increased in large numbers, showing the trend of diversified development. However, due to the shortage of spectrum resources and low spectrum utilization in the communication network, the development of 5G and Internet of Things technology is restricted. Therefore, it is necessary to introduce cognitive radio (CR) to improve the wireless spectrum utilization. Sensing, spectrum sharing and spectrum switching, as key technologies in cognitive wireless networks, can effectively realize the sharing and reuse of wireless spectrum resources, thus improving the utilization ...

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.

Images