Journal
IEEE COMMUNICATIONS LETTERS
Volume 25, Issue 10, Pages 3209-3213Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LCOMM.2021.3097737
Keywords
Backscatter; Optimization; Security; Radio frequency; Power demand; Throughput; Energy consumption; Backscatter communications; max-min fairness; energy efficiency; physical layer security
Categories
Funding
- National Natural Science Foundation of China [61601071, 62071078]
- Natural Science Foundation of Chongqing [cstc2019jcyjxfkxX0002]
- Chongqing Entrepreneurship and Innovation Program for the Returned Overseas Chinese Scholars [cx2020095, cx2020059]
- Shaanxi Key Laboratory of Information Communication Network and Security [ICNS201904]
- Science and Technology Development Fund, Macau SAR [0003/2019/A1, 0110/2020/A3, 0018/2019/AMJ]
- Ministry of Science and Technology of the People's Republic of China [0018/2019/AMJ]
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This work focuses on the importance of secure and fair transmission in wireless-powered backscatter communication networks (WPBCNs) and proposes an energy efficiency (EE)-based resource allocation problem to optimize backscattering time, power ratio of artificial noise (AN), and reflection coefficient of tags to enhance security. The proposed Dinkelbach-based iterative algorithm effectively tackles the non-convexity of the problem and simulation results demonstrate the algorithm's effectiveness.
Secure and fair transmission is essential for wireless-powered backscatter communication networks (WPBCNs), which has not been taken seriously enough by the existing works. In this letter, we consider a multi-tag WPBCN in the presence of an eavesdropper, where a power station (PS) serves multiple tags which backscatter wireless information to a reader. Furthermore, the artificial noise (AN) is transmitted from the PS to impair the eavesdropping capability for security deliberately. An energy efficiency (EE)-based resource allocation problem with max-min fairness is formulated by jointly optimizing the backscattering time, the power ratio of the AN, and the reflection coefficient of each tag, where imperfect channel state information and non-linear energy harvesting models are considered. To tackle its non-convexity, we propose a Dinkelbach-based iterative algorithm to obtain the sub-optimal solution. Simulation results verify the effectiveness of the proposed algorithm.
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