D2D covert communication system for 5G cellular network physical layer security and communication method thereof

Abstract

The invention discloses a D2D covert communication system for 5G cellular network physical layer security and a communication method thereof. The method includes the following steps: constructing a joint assisted covert communication model, performing a covert calculation, and performing a throughput calculation, wherein the joint assisted covert communication model transforms interference links that are generally considered to be adverse into friendly assistants, under the joint assistance of a BS cellular signal and a D2D non-covert signal, the power of each sending end is dynamically allocated, the dynamically changing power is introduced at a detection end of an eavesdropper Willie, and thus the concealment and throughput can be effectively improved; in the covert calculation, whethera detection threshold of the eavesdropper Willie is known to the sending end of the Pair m is determined based on D2D communication, and the concealment of the system is measured by adopting an errordetection probability and a minimum error detection probability respectively; and in the throughput calculation, by adjusting the transmission power of a covert signal, an average concealment ratio greater than zero is obtained, that is, the throughput is obtained, and interference cancellation is performed on a Pair m receiving end based on the D2D communication, and thus the throughput of the system can be effectively improved.

Description

technical field [0001] The invention belongs to wireless communication technology, and in particular relates to a D2D covert communication system and a communication method thereof oriented to the security of the physical layer of a 5G cellular network. Background technique [0002] D2D communication means that two terminal devices can directly transmit information without the relay assistance of a base station or an access point. As spectrum resources become more and more tight, D2D communication alleviates the data forwarding burden of base stations and improves spectrum utilization efficiency. Therefore, it has become one of the key technologies of 5G communication and has received more and more attention. In the actual 5G cellular network, D2D end users are mostly single-antenna, power-limited devices. Due to the openness of wireless communication networks, they are extremely vulnerable to interference and eavesdropping. Traditional cryptographic security systems are di...

AI Technical Summary

Problems solved by technology

When the eavesdropper in the D2D cellular communication system knows the channel parameters and noise information of the eavesdropping link, the throughput of the covert signal of the D2D communication link is zero, that is, it is impossible to achieve an average communication rate greater than zero under the condition of concealment constraints.

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