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IEEE Globecom Workshops (GC Wkshps)

Feedback Delay Effects on Physical Layer Security in a Dual-Hop Half/Full-Duplex Bi-Directional Wireless Relaying Networks

Volkan Özduran, Binboğa Sıddık Yarman, J.M. Cioffi

Published Dec 1, 2016• 8 citations
Publisher

Abstract

This paper investigates the feedback delay effects on physical layer security. The investigation considers a dual-hop single amplify-and-forward based untrustworthy half/full-duplex two-way relay with a finite number of friendly jammers in the system model. According to the Monte-Carlo simulation results, the feedback delay degrades the system secrecy achievable rate and causes system coding gain losses in high signal-to-noise regimes. Results also show that if the number of friendly jammers in the system model increases then system secrecy achievable rate tends to degrade and causes system coding gain losses. Results also show that better system secrecy achievable rate can be achieved when the relay terminal operates in full-duplex mode.

DOI
10.1109/glocomw.2016.7848907

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This paper investigates the feedback delay effects on physical layer security. The investigation considers a dual-hop single amplify-and-forward based untrustworthy half/full-duplex two-way relay with a finite number of friendly jammers in the system model. According to the Monte-Carlo simulation results, the feedback delay degrades the system secrecy achievable rate and causes system coding gain losses in high signal-to-noise regimes. Results also show that if the number of friendly jammers in the system model increases then system secrecy achievable rate tends to degrade and causes system coding gain losses. Results also show that better system secrecy achievable rate can be achieved when the relay terminal operates in full-duplex mode.
This paper investigates the impact of the imperfect channel state information that is caused by the channel estimation errors on physical layer security. The investigation considers a dual-hop single amplify-and-forward (AF) based untrustworthy half/full-duplex bi-directional relay with a finite number of friendly jammers in the system model. According to Monte-Carlo simulation results, the channel estimation error causes system coding gain losses at low signal-to-noise ratio (SNR) regimes both for half and full-duplex cases. Results also show that the CEE effects turn out to be at negligible levels in high SNR regimes. Results also show that friendly jammer, besides improving the secrecy performance of the system model, also degrades the curves and causes system coding gain losses at high SNR regimes. Results also show that better secrecy performance can be achieved when the relay terminal operates in full-duplex mode.
This paper investigates the physical layer security of orthogonal frequency division multiplexing technique. The investigation considers a multi-user untrustworthy half/full-duplex based two-way wireless relay with a finite number of friendly jammers in the system model. According to Monte-Carlo simulation results, the system model that operates in full-duplex mode achieves slightly better secrecy outage performance than the system model that operates in half-duplex mode. The results also show that friendly jammers, besides minimizing the information leakage, degrade the system performance severely and cause system coding gain losses in high signal-to-noise ratios.
This paper investigates the physical layer security of the orthogonal frequency division multiplexing based wireless relaying network. The investigation considers a multi-user untrustworthy amplify-and-forward based one-way full-duplex wireless relaying network in the system model. According to the Monte-Carlo simulation results, the friendly jammers severely affect the system achievable secrecy outage probability performance and degrade the system performance curves in high signal-to-noise ratio regimes. Results also show that the system model that contains a large number of user-pairs achieves better secrecy performance in comparison to a small number of user-pairs.
In this paper we represent a half-duplex relay network to investigate the secrecy performance of multi-hop relaying system. In this paper half duplex relay(HDR) is used to enhance the physical layer security (PLS) for secure transmission in multi-hop relaying system, in which each intermediate node help to forward the message as a relay. In this paper, we find out the secrecy performance of half-duplex jamming (HDJ) network and this network is design in such a way that each HDR transmit jamming signal to the intruder when it receive the required signal from the previous adjacent node. In this paper we also investigated the achievable secrecy rate in HDR and HDJ network under the total transmit power constraint with the decode-and-forward scheme. Numerical results show that the HDJ network has better secrecy rate than HDR network.
In this letter, we consider secure communications in multi-hop relaying systems, where full-duplex relays (FDRs) operate to enhance wireless physical layer security. Each FDR is designed to transmit jamming signals to the eavesdropper when it receives information signals from the previous adjacent node. The achievable secrecy rate with the proposed decode-and-forward (DF) FDRs are analyzed with a total transmit power constraint. The transmit power allocation problem is solved by using the geometric programming (GP) method. Numerical results present that the proposed FDRs significantly enhance the secrecy rate compared to the conventional half-duplex relays (HDRs).
Abstract This study investigates the impact of imperfect channel state information (CSI), caused by channel estimation errors and feedback delays, on the physical‐layer security performance of multi‐user relay networks. More specifically, a multi‐user untrusted half/full‐duplex (HD/FD) uni/bi‐directional wireless amplify‐and‐forward (AF) relay network is studied, adopting orthogonal frequency division multiplexing (OFDM). In order to minimize the information leakage, it is considered that a limited number of friendly jammers affect the untrusted relay. In this context, the achievable secrecy rate of the relay network is theoretically analyzed and optimization problems are formulated and solved for the untrusted relay's location and power allocation. Monte Carlo simulations are conducted to validate the theoretical findings, revealing that channel estimation errors cause coding gain losses for low signal‐to noise ratio (SNR) while their impact becomes negligible for high SNR. Also, a large number of user‐pairs achieves higher secrecy rate while FD relaying further improves the secrecy performance. Finally, bi‐directional relaying provides higher achievable secrecy rate over uni‐directional relaying.