Relay transmission method based on physical layer safety in eavesdropping user randomly distributed scene

Abstract

The invention discloses a relay transmission method based on physical layer safety in an eavesdropping user randomly distributed scene. The method comprises the steps of 1), obtaining a safe interruption probability of two-hop relay transmission after two times of independent eavesdropping coding is carried out in the eavesdropping user randomly distributed scene based on a random geometric theory; 2), establishing an optimization problem of maximizing a safe transmission speed under the condition that the total transmitting power of a source node and a relay node is limited; and 3), obtaining a relay transmission method capable of maximizing the safe transmission speed through solution of the established optimization problem, wherein the method comprises two parts of power distribution and codebook rate design. According to the method, under the condition that the specific locations of the eavesdropping users are unknown, the communication reliability and safety are taken into comprehensive consideration, the safe interruption probability constraint is satisfied, and moreover, the safe transmission speed is maximized.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a relay transmission method based on physical layer security in a scenario where eavesdropping users are randomly distributed. Background technique [0002] Due to the broadcast characteristics of wireless channels, the private information transmitted between nodes is easily eavesdropped by some illegal nodes (eavesdropping users), which poses a threat to the safe transmission of information. Traditional high-level encryption technology ensures information security based on the assumption that eavesdropping users have limited computing power. However, with the development of high-speed and efficient computing technologies such as quantum computing, the computing power of eavesdropping users will tend to be infinite, and high-level encryption technology will no longer be able to guarantee the absolute security of information. Correspondingly, the physic...

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Problems solved by technology

[0003] However, in many studies on physical layer security, it is assumed that the channel state of the eavesdropping user is known

In fact, this assumption is difficult to realize in reality, because the eavesdropping user usually keeps silent and does not send any signal, even the location distribution of the eavesdropping user is difficult to obtain

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