Secrecy Rate of Two-Hop AF Relaying Networks with an Untrusted Relay

Zhou, Nanrun; Chen, Xun; Li, Chisheng; Zhi, Xue

doi:10.1007/s11277-013-1351-1

Cited by 13 publications

(13 citation statements)

References 13 publications

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“…Corollary 2: Without interference sources, we can express the secrecy outage probability P SUB out as (see (19)). …”

Section: Exact Secrecy Outage Probabilitymentioning

confidence: 99%

“…In [13][14][15], the authors proposed the opportunistic selection schemes to enhance the system performance when multiple eavesdroppers are present in the network. In [16][17][18][19], the problems of the secure transmission in amplify-and-forward relay systems with untrustworthy relay nodes were introduced and investigated. In the untrusted relay networks, the relays are trustworthy and the eavesdropper, if exists, is an external node in addition to the legitimate parties [16].…”

Section: Introductionsmentioning

confidence: 99%

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Secrecy performance analysis with relay selection methods under impact of co‐channel interference

et al. 2015

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In this study, the authors evaluate secrecy performance of cooperative protocols with relay selection methods under impact of co-channel interference. In particular, the authors propose an optimal selection scheme to maximise the secrecy capacity obtained at the cooperative phase. In addition, the authors also consider suboptimal and random selection schemes which reduce the complexity of implementation, when compared with the optimal one. For performance evaluation, the authors derive exact and asymptotic closed-form expressions of secrecy outage probability and probability of non-zero secrecy capacity for the considered schemes over Rayleigh fading channels. Monte Carlo simulations are performed to validate the derivations.

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“…Corollary 2: Without interference sources, we can express the secrecy outage probability P SUB out as (see (19)). …”

Section: Exact Secrecy Outage Probabilitymentioning

confidence: 99%

Section: Introductionsmentioning

confidence: 99%

Secrecy performance analysis with relay selection methods under impact of co‐channel interference

et al. 2015

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“…The secrecy rate of AF-AN cooperative relaying scheme is obtained by substituting Equations 18 and 19 in Equation 26 as…”

Section: Amplify-and-forward Relaying Scheme With Artificial Noise mentioning

confidence: 99%

“…In Zhou et al, 26 a comparison between one-way and two-way half-duplex AF relaying schemes with an untrusted relay is studied in terms of their secrecy rates, and it is found that with equal transmit power at the two relaying protocols, the two-way relaying scheme has better performance compared with one-way relaying protocol under high SNR regime. In Li et al, 27 an AN-aided jamming strategy is exploited to improve the secrecy rate of a two-way AF relay network in the presence of an eavesdropper, employing power allocation at the source and relay.…”

Section: Introductionmentioning

confidence: 99%

“…Adopting the transmission scheme in An et al 24 to the proposed model, the three scenarios are studied under two cooperative schemes; AF without and with artificial noise (AN) and their secrecy performance is compared with direct transmission schemes. Here, the main focus is on relay selection; however, the proposed algorithm can be further modified and applied for two-way relay communication 26,27 employing cooperative trusted or untrusted relays.…”

Section: Introductionmentioning

confidence: 99%

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A novel relay selection algorithm using ant colony optimization with artificial noise for secrecy enhancement in cooperative networks

Jibukumar

Sabu

2018

Int J Communication

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Cooperative communication is one of the fastest growing research areas of today. It can efficiently mitigate the effect of shadowing and fading with the help of relays and proper relay selection technique. In this paper, a novel relay selection scheme combined with artificial noise (AN) is devised to enhance the secrecy of cooperative networks with amplify-and-forward scheme, over Rayleigh fading channels in the presence of a passive eavesdropper. The probability of path selection of ant colony optimization algorithm is used for selecting the best relay with high end-to-end signal-to-noise ratio. The probability of choosing a path depends on the significance of channel gain (G) and fading coefficients (h). The proposed algorithm finds the best relay in the following wireless scenarios: when (i) both channel gain and fading coefficients are significant; (ii) only fading coefficients are significant; and (iii) only channel gain is significant. Because the direct links between source and destination and source and eavesdropper are considered, AN along with the information is sent by both the source and the selected relay. The performance is evaluated based on secrecy rate (R s ); for the relays randomly placed between the source and destination and for different eavesdropper's location. The results show that the proposed relay selection scheme achieves better secrecy for different wireless scenarios compared with traditional schemes. With the help of AN, the secrecy rate can be made positive even when the eavesdropper lies near to source.

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Nelder‐Mead–based power optimization for secrecy enhancement in amplify‐and‐forward cooperative relay networks

Jibukumar

Ali

2019

Int J Communication

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SummaryCooperative communication based on relaying nodes has been considered as a promising technique to increase the physical layer security (PLS) performance in wireless communications. In this paper, an optimal power allocation (OPA) scheme based on Nelder‐Mead (NM) algorithm is proposed for improving the secrecy rate of amplify‐and‐forward (AF) cooperative relay networks employing cooperative jamming (CJ) scheme. The proposed hybrid jamming scheme allows the source and selected relay to transmit the jamming signal along with the information to confound the eavesdropper. The path selection probability of ant colony optimization (ACO) algorithm is used for selecting the relay for transmission. The performance based on secrecy rate is evaluated for “n” trusted relays distributed dispersedly between the source and destination. Gradient‐based optimization and three‐dimensional exhaustive search methods are used as benchmark schemes for comparison of the proposed power optimization algorithm. The secrecy performance is also compared with conventional AF scheme and CJ scheme without power optimization (EPA). The impact of single and multiple relays on secrecy performance is also evaluated. Numerical results reveal that, compared with the gradient method and exhaustive search algorithm, the proposed power allocation strategy achieves optimal performance. Also, the derived OPA results show a significantly higher secrecy rate than the EPA strategy for both CJ and AF schemes.

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Secrecy Rate of Two-Hop AF Relaying Networks with an Untrusted Relay

Cited by 13 publications

References 13 publications

Secrecy performance analysis with relay selection methods under impact of co‐channel interference

Secrecy performance analysis with relay selection methods under impact of co‐channel interference

A novel relay selection algorithm using ant colony optimization with artificial noise for secrecy enhancement in cooperative networks

Nelder‐Mead–based power optimization for secrecy enhancement in amplify‐and‐forward cooperative relay networks

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