Artificial noise precoding secure transmission method for full duplex relay system

Abstract

The invention discloses an artificial noise precoding secure transmission method for a full duplex relay system. The method comprises the following steps: an information source adopts an artificial noise precoding scheme to simultaneously broadcast useful signals and artificial noise signals; a relay receives the signals broadcast by the information source and the self-interference at the relay, and a wiretapper receives the signals broadcast by the information source and recoding signals transmitted by the relay; a relay node reduces the influence caused by the self-interference by adopting a self-interference elimination technique; an information sink receives the transmitted signals that are recoded by the relay by adopting a maximal-ratio combining strategy; the signal to interference and noise ratios of the information source to a relay link and the relay to an information sink link are obtained, and the received signal to interference and noise ratios at the information sink and the wiretapper are also calculated; and the instantaneous safety rate of the system is obtained according to the received signal to interference and noise ratios at the information sink and the wiretapper, and an average safety rate is calculated. According to the method disclosed by the invention, the legal channel transmission rate can be increased, and the capacity of wiretap channels can also be effectively reduced.

Description

technical field [0001] The invention relates to the fields of wireless communication and physical layer security, in particular to a method for secure transmission of artificial noise precoding in a full-duplex relay system. Background technique [0002] With the rapid development of wireless communication technology and the user's further requirements for service quality, communication security has become an important concern. In wireless communication, the broadcast characteristics of radio frequency signals make the information broadcast by the source easily intercepted by eavesdroppers. Eavesdropping has become a growing challenge for wireless communication systems. The traditional encryption method is to use an encryption coding scheme on the upper layer of the physical layer, so as to improve the security transmission performance of the system. However, the effectiveness of the encryption coding scheme is based on the assumption that the computing power of the eavesd...

AI Technical Summary

Problems solved by technology

However, the effectiveness of the encryption coding scheme is based on the assumption that the computing power of the eavesdropping end is limited

In the context of the rapid increase in the computing power of modern processors, traditional upper-level encryption schemes are becoming more and more unreliable

In addition, in the current relay transmission system, the relay mostly works in half-duplex mode, which cannot make full use of wireless resources (time and frequency), resulting in a waste of wireless resources

Furthermore, the existing research on the traditional three-node (source, relay, and sink) eavesdropping model found that the positive security rate does not always exist, which will lead to the limited transmission rate of the wireless communication system

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