[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
Author, co-author :
Chatzinotas, Symeon ; University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > SigCom
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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