Covert Communication in Fading Channels under Channel Uncertainty

Shahzad, Khurram; Zhou, Xiangyun; Yan, Shihao

doi:10.1109/vtcspring.2017.8108525

Cited by 149 publications

(78 citation statements)

References 14 publications

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“…Most recently, [13] examined the impact of noise uncertainty on covert communication by considering two practical uncertainty models. In addition, the effect of imperfect channel state information and finite blocklength on covert communication has been investigated in [14] and [15], respectively, while covert communication in one-way relay networks over Rayleigh fading channels is examined in [16].…”

Section: Introductionmentioning

confidence: 99%

Covert Communications with a Full-Duplex Receiver over Wireless Fading Channels

Shahzad

Yan

et al. 2018

2018 IEEE International Conference on Communications (ICC)

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In this work, we propose a covert communication scheme where the transmitter attempts to hide its transmission to a full-duplex receiver, from a warden that is to detect this covert transmission using a radiometer. Specifically, we first derive the detection error rate at the warden, based on which the optimal detection threshold for its radiometer is analytically determined and its expected detection error rate over wireless fading channels is achieved in a closed-form expression. Our analysis indicates that the artificial noise deliberately produced by the receiver with a random transmit power, although causes self-interference, offers the capability of achieving a positive effective covert rate for any transmit power (can be infinity) subject to any given covertness requirement on the expected detection error rate. This work is the first study on the use of the full-duplex receiver with controlled artificial noise for achieving covert communications and invites further investigation in this regard.

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Section: Introductionmentioning

confidence: 99%

Covert Communications with a Full-Duplex Receiver over Wireless Fading Channels

Shahzad

Yan

et al. 2018

2018 IEEE International Conference on Communications (ICC)

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“…As it is proved in [21,Lemma 2] for AWGN channels and also pointed out in [14,Lemma 1], the optimal decision rule that minimizes Willie's detection error is given by…”

Section: A P Ew With the Optimal Detector At Williementioning

confidence: 96%

Covert Millimeter-Wave Communication via a Dual-Beam Transmitter

Jamali

Mahdavifar

2019

2019 IEEE Global Communications Conference (GLOBECOM)

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In this paper, we investigate covert communication over millimeter-wave (mmWave) frequencies. In particular, a dual-beam mmWave transmitter, comprised of two independent antenna arrays, attempts to reliably communicate to a receiver Bob when hiding the existence of transmission from a warden Willie. In this regard, operating over mmWave bands not only increases the covertness thanks to directional beams, but also increases the transmission data rates given much more available bandwidths and enables ultra-low form factor transceivers due to the lower wavelengths used compared to the conventional radio frequency (RF) counterpart. We assume that the transmitter Alice employs one of its antenna arrays to form a directive beam for transmission to Bob. The other antenna array is used by Alice to generate another beam toward Willie as a jamming signal with its transmit power changing independently from a transmission block to another block. We characterize Willie's detection performance with the optimal detector and the closed-form of its expected value from Alice's perspective. We further derive the closed-form expression for the outage probability of the Alice-Bob link, which enables characterizing the optimal covert rate that can be achieved using the proposed setup. Our results demonstrate the superiority of mmWave covert communication, in terms of covertness and rate, compared to the RF counterpart.

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“…The effect of finite blocklength (i.e., a finite number of channel uses) over AWGN channels on covert communications was investigated in [18], [19]. A covert communication system under block fading channels was examined in [20], where transceivers have uncertainty on the related channel state information (CSI). In [21], [22], the authors utilized a full-duplex receiver to achieve covert communications in wireless fading channels and analyzed the covert communication limits.…”

Section: Introductionmentioning

confidence: 99%

Covert Transmission With a Self-Sustained Relay

Yan

Shu

et al. 2019

IEEE Trans. Wireless Commun.

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This work examines the possibility, performance limits, and associated costs for a self-sustained relay to transmit its own covert information to a destination on top of forwarding the source's information. Since the source provides energy to the relay for forwarding its information, the source does not allow the relay's covert transmission and is to detect it. Considering the time switching (TS) and power splitting (PS) schemes for energy harvesting, where all the harvested energy is used for transmission at the self-sustained relay, we derive the minimum detection error probability ξ * at the source, based on which we determine the maximum effective covert rate Ψ * subject to a given covertness constraint on ξ * . Our analysis shows that ξ * is the same for the TS and PS schemes, which leads to the fact that the cost of achieving Ψ * in both the two schemes in terms of the required increase in the energy conversion efficiency at the relay is the same, although the values of Ψ * in these two schemes can be different in specific scenarios. For example, the TS scheme outperforms the PS scheme in terms of achieving a higher Ψ * when the transmit power at the source is relatively low. If the covertness constraint is tighter than a specific value, it is the covertness constraint that limits Ψ * , and otherwise it is upper bound on the energy conversion efficiency that limits Ψ * .

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Covert Communication in Fading Channels under Channel Uncertainty

Cited by 149 publications

References 14 publications

Covert Communications with a Full-Duplex Receiver over Wireless Fading Channels

Covert Communications with a Full-Duplex Receiver over Wireless Fading Channels

Covert Millimeter-Wave Communication via a Dual-Beam Transmitter

Covert Transmission With a Self-Sustained Relay

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