Information Technology

CLC number: TP391.8

A Wire-Line Secure Communication System Based on CCFD Self-Interference Cancellation

¹ School of Information Engineering, Hubei Minzu University, Enshi 445000, Hubei, China
² College of Physical Science and Technology, Central China Normal University, Wuhan 430070, Hubei, China

† To whom correspondence should be addressed. E-mail: liusanjunbox1@126.com

Received: 16 September 2021

Abstract

This paper presents a design scheme of wire-line telephone system using self-interference (SI) cancellation technology in co-frequency co-time full-duplex (CCFD) system to realize absolute secure communication at the physical layer. This scheme can hide the target signal by skillfully releasing the high-power artificial noise to the whole link at the receiving node, and then make use of the receiver’s knowledge of the SI signal to achieve high dB SI cancellation with the help of analog domain SI cancellation technology in CCFD domain, so that the signal-to-noise ratio (SNR) received by the eavesdropper at any position of the link is far lower than that of the legitimate receiver, so as to realize the absolutely secure communication in the sense of Wyner principle. This paper not only puts forward the specific design scheme of absolutely secure communication telephone, but also analyzes the calculation of security capacity under different eavesdropping positions, different SI cancellation capability and different system parameters according to Shannon theory.