Physical layer secure wireless relay communication method based on game theory

Abstract

The invention discloses a physical layer secure wireless relay communication method based on a game theory. The physical layer secure wireless relay communication method comprises the steps of: step 1, defining a communication model; step 2, defining security capacity of a physical layer; step 3, defining a primary user revenue function Up; step 4, defining a secondary user revenue function Ur; step 5, and establishing a game model. The physical layer secure wireless relay communication method can increase the security capacity by selecting the optimal relay, can select the optimal power for information transmission through power control, thereby achieving the effect of improving energy efficiency of the system. The physical layer secure wireless relay communication method has the effects of reducing eavesdropping probability and improving the energy efficiency of the system, solves the anti-eavesdropping problem in the broadcast environment, and is very suitable for the application scene with energy-constrained and distributed features and the like.

Description

technical field [0001] The invention relates to the technical field of wireless relay communication, in particular to a physical layer security wireless relay communication method based on game theory. Background technique [0002] As a core issue of wireless communication, wireless network security has always been the focus of people's attention, and it is also a prerequisite for the large-scale popularization and application of wireless networks. In wireless networks, the purpose of secure communication mainly includes two aspects: 1) reliability, to ensure that the destination receiver can receive the original information of the source sender; 2) security, to ensure that the sent message will not be tampered with by any third party steal to. The traditional method to solve the wireless network security problem is to encrypt the transmission information, and use different strengths of encryption depending on the importance of the transmission information. Data security i...

AI Technical Summary

Problems solved by technology

However, with the rapid development of computer hardware technology, the use of a single key to encrypt transmission may be cracked by violence.

Although the key encryption method can obtain better information security performance, the complexity of the encryption algorithm is often relatively high.

However, measures such as improving the strength of the encryption algorithm and updating the key in time need to consume a lot of energy and computing costs.

[0003] At the same time, the following challenges are still faced in wireless network security communication: (1) Due to the broadcast characteristics of wireless channels, it is easier for eavesdroppers and attackers to intercept information transmission (especially the transmission of keys) or reduce the transmission quality of the channel; ( 2) Due to the lack of distributed network infrastructure, key distribution is very difficult; (3) Mobile networks have a dynamic topology, for example, mobile ad hoc multi-hop networks (Ad Hoc Network), making key management extremely expensive; (4) Most wireless terminals (such as mobile phones, sensor nodes, etc.) are powered by batteries, and the limited energy makes the high-energy public key algorithm system useless

It is worth noting that in the process of continuous development and innovation of wireless network security, the physical layer at the bottom of the network protocol stack has been ignored; (5) due to the passive nature of eavesdropping, trust-based mechanisms are no longer applicable

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