Reference : 1 Energy-Efficient Hybrid Beamforming for Multi-Layer RIS-Assisted Secure Integrated ...
Scientific journals : Article
Engineering, computing & technology : Computer science
Computational Sciences
1 Energy-Efficient Hybrid Beamforming for Multi-Layer RIS-Assisted Secure Integrated Terrestrial-Aerial Network
Sun, Yifu []
An, Kang []
Zhu, Yonggang []
Zheng, Gan []
Wong, Kai-Kit []
Chatzinotas, Symeon mailto [University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > SigCom >]
Guan, Dongfang []
Wing Kwan Ng, Derrick []
IEEE Transactions on Communications
Institute of Electrical and Electronics Engineers
4189 - 4210
United States
[en] The integration of aerial platforms to provide ubiq-
uitous coverage and connectivity for densely deployed terrestrial
networks is expected to be a reality in emerging sixth-generation
networks. Energy-effificient design and secure transmission are
two crucial issues for integrated terrestrial-aerial networks.
With this focus, due to the potential of RIS in substantially
saving power consumption and boosting the security of private
information by enabling a smart radio environment, this paper
investigates the energy-efficient hybrid beamforming for multi-
layer reconfigurable intelligent surface (RIS)-assisted secure in-
tegrated terrestrial-aerial network for defending against simul-
taneous jamming and eavesdropping attacks. Specifically, with
the available of angular information based imperfect channel
state information (CSI), we propose a framework for the joint
optimization of user’s received precoder, terrestrial BS’s and
HAP’s digital precoder, and multi-layer RIS analog precoder
to maximize the system energy efficiency (EE) performance. For
the design of received precoder, a heuristic beamforming scheme
is proposed to convert the worst-case problem into a min-max
one such that a closed-form solution is derived. For the design
of digital precoder, we propose an iterative sequential convex
approximation approach via capitalizing the auxiliary variables
and first-order Taylor series expansion. Finally, a monotonic
vertex-update algorithm with penalty convex concave procedure
is proposed to obtain analog precoder with low computational
complexity. Numerical results show the superiority and effective-
ness of proposed optimization framework and architecture
10.13039/501100001809-National Natural Science Foundation of China (Grant Number: 61901502, 62131005 and 62071352) ; R-STR-5010-00-Z SIGCOM RG of Interdisciplinary Centre for Security, Reliability and Trust, University of Luxembourg ; 10.13039/501100012152-National Postdoctoral Program for Innovative Talents (Grant Number: BX20200101)

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