Secure Communication With Outdated Channel State Information via Untrusted Relay Capable of Energy Harvesting

Lim, Jin-Taek; Lee, Kisong; Han, Youngnam

doi:10.1109/tvt.2020.3010008

Cited by 12 publications

(10 citation statements)

References 35 publications

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“…In addition, we consider a quasi-static frequency nonselective channel, where the channel is constant over the duration of a single time slot and changes every time slot with correlation [14], [15]. The baseband noise for node i is denoted n i , and is assumed to follow a complex additive white Gaussian noise (AWGN) with zero-mean and variance σ 2 , i.e., n i ∼ CN 0, σ 2 .…”

Section: System Modelmentioning

confidence: 99%

“…One candidate which also influences the optimal artificial noise level is the time-varying nature of channels. In PLS relaying network, the time-varying fading channels causes the channel state information (CSI) to become outdated [11]- [15]. In particular, if the receiver which wants to decode the artificial noise does not know the exact CSI through the artificial noise sent, it can not perfectly filter out the artificial noise from the received signal, resulting in residual jamming interference (RJI).…”

Section: Introductionmentioning

confidence: 99%

“…In the presence of outdated CSI, [13] investigated the on-off scheme to help perform secure transmission and presented the design of wiretap coding parameters. Moreover, based on the study of [10], the optimal control of the artificial noise power level under outdated CSI were derived to maximize the secrecy performance of wireless powered untrusted relay networks in [14], [15].…”

Section: Introductionmentioning

confidence: 99%

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Impact of Outdated CSI on the Secure Communication in Untrusted In-Band Full-Duplex Relay Networks

2022

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To provide reliable connectivity in recent and future wireless communication systems, it is necessary to deploy several relay nodes. Further, a full-duplex (FD) technique has been in the spotlight since it can significantly improve spectral efficiency, and thus recent studies in relaying networks have considered FD relays. In relaying networks, confidentiality between the source and destination nodes from the relay node should be carefully kept, especially, when the relay node is not fully trusted, so-called untrusted relay node. To this end, in this paper, we consider physical-layer security taking into account an untrusted FD relay node. We investigate a secure relaying protocol against the untrusted relay node where the destination generates artificial noise to prevent the untrusted relay from decoding the source information. We derive the analytical expression of the lower bound of the ergodic secrecy rate ( R). We find two main factors affecting the secrecy performance: residual self-interference (RSI) at the FD-available nodes (i.e., relay and destination), and outdated channel state information (CSI) at the destination. Thereafter, we evaluate their effects on R and suggest the algorithm for finding the sub-optimal artificial noise power level at the destination for maximizing R. Through simulations, we have verified our mathematical derivation and have shown that our secure relaying protocol can achieve near-optimal secrecy performance. Numerical results imply that the artificial noise power level should be carefully considered when the channel is severely outdated and RSI is irresistible.INDEX TERMS Physical-layer security, untrusted relay, full-duplex, outdated channel state information, artificial noise.

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Section: System Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Impact of Outdated CSI on the Secure Communication in Untrusted In-Band Full-Duplex Relay Networks

2022

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“…Since pilots appear in all unoccupied frequency bins of the inserted symbols, the block-type pilots are insensitive to the frequency selective fading. In other words, they are only valid for the slow-varying channels, where the CSI is constant during one block [ 16 , 17 ]. Besides, the pilot symbols could not carry data, which reduces the system efficiency.…”

Section: Introductionmentioning

confidence: 99%

Efficient Non-Uniform Pilot Design for TDCS

Chang

Feng²,

Zhou

et al. 2021

Sensors

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The Internet of Things (IoT) leads the era of interconnection, where numerous sensors and devices are being introduced and interconnected. To support such an amount of data traffic, wireless communication technologies have to overcome available spectrum shortage and complex fading channels. The transform domain communication system (TDCS) is a cognitive anti-interference communication system with a low probability of detection and dynamic spectrum sensing and accessing. However, the non-continuous and asymmetric spectrum brings new challenges to the traditional TDCS block-type pilot, which uses a series of discrete symbols in the time domain as pilots. Low efficiency and poor adaptability in fast-varying channels are the main drawbacks for the block-type pilot in TDCS. In this study, a frequency domain non-uniform pilot design method was proposed with intersecting, skewing, and edging of three typical non-uniform pilots. Some numerical examples are also presented with multipath model COST207RAx4 to verify the proposed methods in the bit error ratio and the mean square error. Compared with traditional block-type pilot, the proposed method can adapt to the fast-varying channels, as well as the non-continuous and asymmetric spectrum conditions with much higher efficiency.

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“…Due to the broadcast nature of radio propagation, wireless communication is vulnerable to be eavesdropped [12]. In relay-assisted NOMA networks, when the relay is untrusted, it may exploit these weaknesses to its benefit and behave as a passive eavesdropper who tries to listen in on an ongoing transmission [13]. Cooperative jamming has been become a promising technique to protect the transmission in untrusted relay OMA networks [14].…”

mentioning

confidence: 99%

On the performance of physical layer security in virtual full-duplex non-orthogonal multiple access system

Guo

Liu

2021

J Wireless Com Network

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This paper investigates physical layer security analysis of cooperative non-orthogonal multiple access (NOMA) communication system. A virtual full-duplex (VFD) relaying scheme with an untrusted amplify-and-forward (AF) half-duplex (HD) relay and a trusted decode-and-forward (DF) HD relay is used in this system to improve the spectral efficiency. In order to prevent the untrusted relay from eavesdropping, a simple and practical cooperative jamming scheme is designed to confuse the untrusted relay. The exact expressions of effective secrecy throughput (EST) for NOMA users and approximate expression of EST for non-NOMA user are derived. All theoretical results are validated by numerical simulations which demonstrate that the proposed VFD-NOMA scheme is superior to existing HD-NOMA scheme in cooperative system and jamming plays an important role for obtaining acceptable EST. In addition, simulation results shows that the best secrecy performance highly depends on the system parameters such as transmit powers and jamming signal power.

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Secure Communication With Outdated Channel State Information via Untrusted Relay Capable of Energy Harvesting

Cited by 12 publications

References 35 publications

Impact of Outdated CSI on the Secure Communication in Untrusted In-Band Full-Duplex Relay Networks

Impact of Outdated CSI on the Secure Communication in Untrusted In-Band Full-Duplex Relay Networks

Efficient Non-Uniform Pilot Design for TDCS

On the performance of physical layer security in virtual full-duplex non-orthogonal multiple access system

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