Intelligent Reflecting Surface-Aided Covert Ambient Backscatter Communication

This paper presents a covert ambient backscatter communication (AmBC) system aided by the intelligent reflecting surface (IRS), where an IRS is used as a beamformer to help Tag for covert AmBC. Technically, we derive the expression of the Kullback-Leibler (KL) divergence to measure the detection per...

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Published inIEEE transactions on communications Vol. 72; no. 6; pp. 3558 - 3571
Main Authors Liu, Jiahao, Yu, Jihong, Zhang, Rongrong, Wang, Shuai, Yang, Kai, An, Jianping
Format Journal Article
LanguageEnglish
Published New York IEEE 01.06.2024
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Algorithms
Array signal processing
Backscatter
Backscattering
Beamforming
Channel estimation
Covert ambient backscatter communication
Divergence
IRS
Mathematical programming
Optimization
Radio frequency
Reconfigurable intelligent surfaces
Reflectance
Reflection coefficient
RF signals
Security
Online AccessGet full text
ISSN0090-6778
1558-0857
DOI10.1109/TCOMM.2024.3356441

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Abstract This paper presents a covert ambient backscatter communication (AmBC) system aided by the intelligent reflecting surface (IRS), where an IRS is used as a beamformer to help Tag for covert AmBC. Technically, we derive the expression of the Kullback-Leibler (KL) divergence to measure the detection performance of the warden. To fight against the warden's detection, we propose a joint IRS's beamforming and Tag's reflection coefficient optimization scheme to maximize the covert AmBC rate subject to a key constraint metric of the KL divergence. To solve the non-convex problem, we formulate it as Fractional Programming (FP) for the linear iterations, and use the Majorization-Minimization (MM) algorithm to obtain the optimal parameters of IRS and Tag. Moreover, we investigate the covert performance with the imperfect channel state information of the warden's link (WCSI) with Tag and IRS. Numerical results show the covert performance of the system, and illustrate the superiority of the IRS's assistance to the covert backscatter efficiency. The simulations also show that the channel estimated error of Tag-Willie link has a negative impact on the covert backscatter efficiency, while the channel estimated errors of IRS-Willie link have the positive influence on the contrary.
AbstractList This paper presents a covert ambient backscatter communication (AmBC) system aided by the intelligent reflecting surface (IRS), where an IRS is used as a beamformer to help Tag for covert AmBC. Technically, we derive the expression of the Kullback-Leibler (KL) divergence to measure the detection performance of the warden. To fight against the warden’s detection, we propose a joint IRS’s beamforming and Tag’s reflection coefficient optimization scheme to maximize the covert AmBC rate subject to a key constraint metric of the KL divergence. To solve the non-convex problem, we formulate it as Fractional Programming (FP) for the linear iterations, and use the Majorization-Minimization (MM) algorithm to obtain the optimal parameters of IRS and Tag. Moreover, we investigate the covert performance with the imperfect channel state information of the warden’s link (WCSI) with Tag and IRS. Numerical results show the covert performance of the system, and illustrate the superiority of the IRS’s assistance to the covert backscatter efficiency. The simulations also show that the channel estimated error of Tag-Willie link has a negative impact on the covert backscatter efficiency, while the channel estimated errors of IRS-Willie link have the positive influence on the contrary.
Author Liu, Jiahao
An, Jianping
Wang, Shuai
Yu, Jihong
Yang, Kai
Zhang, Rongrong
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SubjectTerms Algorithms
Array signal processing
Backscatter
Backscattering
Beamforming
Channel estimation
Covert ambient backscatter communication
Divergence
IRS
Mathematical programming
Optimization
Radio frequency
Reconfigurable intelligent surfaces
Reflectance
Reflection coefficient
RF signals
Security
Title Intelligent Reflecting Surface-Aided Covert Ambient Backscatter Communication
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