Distance-Adaptive Absorption Peak Modulation (DA-APM) for Terahertz Covert Communications

Gao, Weijun; Chen, Yi; Han, Chong; Chen, Zhi

doi:10.1109/twc.2020.3038902

Cited by 41 publications

(29 citation statements)

References 34 publications

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“…As one of key aspects of security, covert communications are also dependent on the propagation modeling. A new distance-adaptive modulation scheme for covert communications in the THz band was proposed in [142]. To be more specific, the studies on THz channel suggest that the THz band can be split into several transmission windows with several absorption peaks at resonant frequencies as stated earlier.…”

Section: Securitymentioning

confidence: 90%

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THz channel modeling: Consolidating the road to THz communications

Liu

Guo

et al. 2021

China Commun.

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For the sake of meeting the demand of data rates at terabit (Tbit) per second scale in future networks, the terahertz (THz) band is widely accepted as one of the potential key enabling technologies for next generation wireless communication systems. With the progressive development of THz devices, regrading THz communications at system level is increasing crucial and captured the interest of plenty of researchers. Within this scope, THz channel modeling serves as an indispensable and fundamental element. By surveying the latest literature findings, this paper reviews the problem of channel modeling in the THz band, with an emphasis on molecular absorption loss, misalignment fading and multipath fading, which are major influence factors in the THz channel modeling. Then, we focus on simulators and experiments in the THz band, after which we give a brief introduction on applications of THz channel models with respects to capacity, security, and sensing as examples. Finally, we discuss some key issues in the future THz channel modeling.

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Section: Securitymentioning

confidence: 90%

“…To be more specific, the studies on THz channel suggest that the THz band can be split into several transmission windows with several absorption peaks at resonant frequencies as stated earlier. Based on it, [142] implemented covert communications with the aid of the high attenuation at absorption peaks.…”

Section: Securitymentioning

confidence: 99%

THz channel modeling: Consolidating the road to THz communications

Liu

Guo

et al. 2021

China Commun.

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“…With the equipment of the ultra-massive multiple-input multiple-output (UM-MIMO) array for THz communications, the narrow and directional beams bring substantial benefits in PLS [5], [7], [8]. Typically, a THz beam is directed towards the legitimate user (LU) through the beam training and tracking processes, which keep the LU inside the beam sector to continuously benefit from the high beamforming gain.…”

Section: A Backgroundmentioning

confidence: 99%

“…However, this technique requires a highcomplexity self-interference cancellation (SIC) to simultaneously transmit the AN signal and receive the information signal. We proposed another range security technique, the distanceadaptive molecular absorption modulation (DA-APM) scheme, which hides the signal under the molecular absorption peaks in the THz band [7]. In recent years, frequency diverse array (FDA) has been recognized as a good candidate to address the security problem.…”

Section: B Related Workmentioning

confidence: 99%

“…First, most conventional security techniques cannot be applied for range security due to their requirement on an uncorrelated LU's and ED's channels, which is not available for the range security. Second, the DA-APM scheme in [7] cannot provide range security when the ED is in near proximity of the Tx. Finally, despite the effectiveness of the receiver AN technique on addressing the THz range-angle security with the ED in close proximity, it brings additional hardware complexity and needs cooperation among the Tx and the LU [8].…”

Section: B Related Workmentioning

confidence: 99%

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On Multiple-Antenna Techniques for Physical-Layer Range Security in the Terahertz Band

Gao¹,

Lü²,

Chen³

et al. 2022

Preprint

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Terahertz (THz) communications have naturally promising physical layer security (PLS) performance in the angular domain due to the high directivity feature. However, if eavesdroppers reside in the beam sector, the directivity fails to work effectively to handle this range-domain security problem.More critically, with an eavesdropper inside the beam sector and nearer to the transmitter than the legitimate receiver, i.e., in close proximity, secure communication is jeopardized. This open challenge motivates this work to study PLS techniques to enhance THz range-angle security. In this paper, a novel widely-spaced array and beamforming (WASABI) design for THz range-angle secure communication is proposed, based on the uniform planar array and hybrid beamforming. Specifically, the WASABI design is theoretically proved to achieve the optimal secrecy rate powered by the non-constrained optimum approaching (NCOA) algorithm with more than one RF chain, i.e., with the hybrid beamforming scheme.Moreover, with a low-complexity and sub-optimal analog beamforming, the WASABI scheme can achieve sub-optimal performance with less than 5% secrecy rate degradation. Simulation results illustrate that our proposed widely-spaced antenna communication scheme can ensure a 6 bps/Hz secrecy rate when the transmit power is 10 dBm. Finally, a frequency diverse array, as an advocated range security candidate in the literature, is proven to be ineffective to enhance range security.Weijun Gao, and Chong Han are with the Terahertz Wireless Communications (

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