Physical layer security control method based on power allocation in full duplex relay system

Abstract

The invention discloses a physical layer security control method based on power allocation in a full duplex relay system. The method comprises the following steps: working in a full duplex mode on thebasis of a relay node, simultaneously sending, by a source node and the relay node, signals, simultaneously receiving, by an eavesdropping node, the signals of the source node and the relay node, andconstructing a signal model; establishing a function relationship between the sending power of the source node and the relay node and system security capacity, namely a constrained optimization function using it as a constraint condition that the sending power of the source node and the relay node is smaller than the maximum sending power and using the maximum system security capacity as the target; when the constraint condition of the sending power of the relay node is not considered, obtaining an optimal sending power expression of the source node, and converting the constrained optimization function into a single-variable constrained optimization function; and finding a feasible solution of the optimal relay sending power by using numerical solution and dichotomy to obtain the expression of the optimal sending power of the relay node. By adoption of the security control method, the physical layer security of the full duplex relay system can be improved.

Description

technical field [0001] The invention relates to the related technical field of physical layer security in a full-duplex relay system, in particular to a physical layer security control method based on power allocation in a full-duplex relay system. Background technique [0002] The popularization of the Internet and the large-scale application of wireless networks have brought convenience to people's lives. While considering the effectiveness and reliability of wireless communication systems, people pay more attention to its security. Signal transmission in wireless communication has broadcast characteristics, which makes it easy for eavesdroppers to receive information when it is sent. From the perspective of the seven-layer protocol of open system interconnection, the current information security technology of communication systems mainly focuses on the network layer and the layers above, and is based on the assumption that the physical layer has provided error-free transm...

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Problems solved by technology

At the same time, the security problems caused by eavesdropping nodes in the prior art cannot be realized in a simple and effective way

[0004] Therefore, in the process of implementing the present application, the inventor found that the prior art has at least the following problems: the security problems caused by eavesdropping nodes cannot be effectively overcome, so that the security in the communication system is not high

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