Achieving Undetectable Communication

Lee, Seonwoo; Baxley, Robert J.; Weitnauer, Mary Ann; Walkenhorst, Brett T.

doi:10.1109/jstsp.2015.2421477

Cited by 222 publications

(141 citation statements)

References 11 publications

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“…To create uncertainty at Willie's decoder, the jammer must vary his total power P j , independently in each n channel uses [7], [8], [22]. That is, the value of P j must be unknown to Willie in a way which he cannot estimate it efficiently.…”

Section: System Modelmentioning

confidence: 99%

“…Similar to previous works on covert communication ([1], [7], [8], [22]), we assume that Alice and Bob share a codebook which is not revealed to Willie; however, Willie knows its statistics. This codebook is generated by independently drawing symbols from a zero-mean complex Gaussian distribution with variance P a and it is assumed to be used only once.…”

Section: System Modelmentioning

confidence: 99%

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Multi-Antenna Jamming in Covert Communication

Shmuel

Cohen

Gurewitz

et al. 2019

2019 IEEE International Symposium on Information Theory (ISIT)

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Covert communication conceals transmission of messages from Alice to Bob out of a watchful adversary, Willie, which tries to determine if a transmission took place or not. While covert communication in a basic, vanilla settings where all variables are known to Willie results in the well known squareroot law, when a jammer is present and assists Alice by creating uncertainty in Willie's decoder, this transmission may have a positive rate.In this work, we analyze the case where the jammer is equipped with multiple antennas and obtain the optimal transmission strategy of the jammer in order to maximize his assistance to Alice, in terms of maximizing a ratio between Willie's and Bob's noise variance. We show that the optimal strategy of the jammer is to perform beamforming towards a single direction with all his available power. This direction though, is not trivial, since it reflects an optimal tradeoff point between minimizing the interference at Bob and maximizing the interference at Willie.

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Section: System Modelmentioning

confidence: 99%

Section: System Modelmentioning

confidence: 99%

Multi-Antenna Jamming in Covert Communication

Shmuel

Cohen

Gurewitz

et al. 2019

2019 IEEE International Symposium on Information Theory (ISIT)

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show abstract

“…[23][24][25] Passive Q-switching has the advantages of high power, low cost and simple apparatus, and is widely used in biomedical imaging, telecommunications, remote sensing and other fields. [26][27][28] The Qswitched pulse of the fiber laser in the Yb, Er, and Tm-doped band has been studied in previous experimental data and theoretical simulations. [29][30][31][32] The characteristic parameters of passively Q-switched pulses, such as pulse width, pulse energy and peak power etc, are optimized under different experimental conditions and results.…”

Section: Introductionmentioning

confidence: 99%

Few‐Layer Mxene Ti₃C₂T_x (T=F, O, Or OH) for Robust Pulse Generation in a Compact Er‐Doped Fiber Laser

Wang

et al. 2019

ChemNanoMat

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MXenes, recently developed two‐dimensional (2D) materials, comprise 2D transition metal carbides, nitrides, and carbonitrides and have variable properties. In particular, accordion‐like structures of MXene have highly tunable and tailorable optoelectronic properties, which indicates that they can be applied in broadband optical devices. However, due to the complex synthesis process, the saturable absorber (SA) properties of MXene have not been fully explored and widely applied until now. In this article, the characterization of few‐layer MXene nanosheets has been systematically performed. Furthermore, the MXene dispersion is utilized as a SA without any polymer and applied in a compact integrated Er‐doped fiber laser at 1.5 μm to generate a robust, high average power pulse. The proposed robust pulsed laser has minimum pulse width of 1.37 μs under average output power of 40 mW and the corresponding pulse energy is 305 nJ, which is higher than previous experimental results. Considering the merits of MXene Ti3C2Tx, in the generation of large energy pulses, our work could be a novel method to optimize photonic devices.

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“…However, it is demonstrated that positive covert rates can be achieved by introducing additional uncertainty, from Willie's perspective, into the system. For instance, it is shown in [9], [10] that Willie's uncertainty about his noise power helps in achieving positive covert rates. Moreover, by considering slotted AWGN channels, it is proved in [11] that positive covert rates are achievable if the warden does not know when the transmission is taking place.…”

Section: Introductionmentioning

confidence: 99%

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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Achieving Undetectable Communication

Cited by 222 publications

References 11 publications

Multi-Antenna Jamming in Covert Communication

Multi-Antenna Jamming in Covert Communication

Few‐Layer Mxene Ti₃C₂T_x (T=F, O, Or OH) for Robust Pulse Generation in a Compact Er‐Doped Fiber Laser

Covert Millimeter-Wave Communication via a Dual-Beam Transmitter

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Achieving Undetectable Communication

Cited by 222 publications

References 11 publications

Multi-Antenna Jamming in Covert Communication

Multi-Antenna Jamming in Covert Communication

Few‐Layer Mxene Ti3C2Tx (T=F, O, Or OH) for Robust Pulse Generation in a Compact Er‐Doped Fiber Laser

Covert Millimeter-Wave Communication via a Dual-Beam Transmitter

Contact Info

Product

Resources

About

Few‐Layer Mxene Ti₃C₂T_x (T=F, O, Or OH) for Robust Pulse Generation in a Compact Er‐Doped Fiber Laser