Relay-assisted secure transmission method and system for cognitive unmanned aerial vehicle

Abstract

The invention discloses a cognitive unmanned aerial vehicle relay-assisted secure transmission method and system; the method comprises the steps: building a communication system from a secondary transmitter to a secondary receiver with an unmanned aerial vehicle as a relay, and a channel model, and carrying out the relay-assisted secure transmission according to a received signal of the secondary receiver and source information intercepted by an eavesdropper; calculating the secrecy rate of a transmission link from the secondary transmitter to the secondary receiver; constructing an optimization model which takes the system secrecy rate as a target function and designs the transmitting power of an unmanned aerial vehicle relay, the interference power transmitted by a secondary receiver, IT constraint and unmanned aerial vehicle position deployment as constraint conditions; under the condition that the position of the unmanned aerial vehicle is fixed, traversing the coordinate positions of a secondary receiver and an eavesdropper, so that an interference power distribution scheme is optimized to maximize the secrecy rate; and obtaining the optimal deployment of the unmanned aerial vehicle by using a secure transmission scheme based on a deep Q network (DQN). The unmanned aerial vehicle is flexible and convenient to deploy and is not influenced by complex terrains and obstacles; besides, the communication applicability is high, and the information transmission quality is high.

Description

technical field [0001] The invention belongs to the technical field of unmanned aerial vehicle communication, and in particular relates to a method and system for secure transmission assisted by a relay of a cognitive unmanned aerial vehicle. Background technique [0002] Present: Future 5G networks are rapidly evolving to accommodate the various requirements of emerging technology verticals, such as becoming smarter and having extremely high security. Cognitive radio is a key enabler for intelligent and efficient use of spectrum resources in 5G networks. In cognitive radio networks, dynamic spectrum access can be achieved through opportunistic spectrum sharing, which has the advantages of low energy consumption, low latency and repeatable deployment. However, this node configuration also brings great security holes, including authentication, confidentiality, and so on. [0003] In order to expand the application range of wireless communication and improve system performan...

AI Technical Summary

Problems solved by technology

Considering the complex outdoor environment, due to uncertain factors in the flight environment, for example: high-rise buildings may block the LOS communication link between the ground user and the BS, which may reduce the reliability of the UAV communication system, thus affecting the communication quality

[0007] (2) Existing physical layer security In the traditional point-to-point information transmission technology, the main security problem is that the nodes at both ends of the communication are eavesdropped

Compared with the traditional point-to-point information transmission technology, the cooperative relay network will face more serious security problems, because the expansion of information diffusion surface will increase the probability of eavesdroppers eavesdropping on confidential information during the multi-path transmission process through relay nodes.

[0008] (3) Existing security solutions lack consideration of the potential uncertainty of the actual network

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