Secrecy Performance of Full-Duplex Relay System With Randomly Located Eavesdroppers

Abstract

Full-duplex (FD) operation improves the spectral efficiency of a relay system where the relay simultaneously transmits and receives signals on the same channel. The performance of FD relay systems is limited by self-interference, i.e., signal leakage from the relays transmit antenna to its receive antenna. However, in the FD relay system with malicious eavesdroppers, simultaneous transmission from the source and relay confuses the eavesdroppers. In this thesis, we investigate a FD relay system where a source communicates with a destination via a decode-and-forward relay in the presence of randomly located eavesdroppers. We derive analytical expressions for the secrecy outage probability and the average secrecy rate of the system. Simulation results show that the secrecy performance of the system is improved as the density of eavesdroppers decreases. It is also shown that the FD re-lay system has higher secrecy performance than the half-duplex relay system when a large portion of self-interference is cancelled.

본 논문에서는 무작위로 위치한 다수 도청자가 존재할 때 복호 후 전송 전달 방식을 사용하는 전이중 중계기를 통해 송신기와 수신기가 통신하는 전이중 중계 시스템에 대해 연구한다. 송수신기 사이의 단대단 신호대간섭잡음비와 가장 해로운 도청자에서 신호대간섭잡음비의 누적분포함수를 유도하여 시스템의 보안 불능 확률과 평균 보안 전송률을 분석한다. 모의 실험을 통해 시스템의 보안 불능 확률과 평균 보안 전송률의 분석 결과가 실험 결과와 일치함을 확인한다.