211 research outputs found
Real-time Optimal Resource Allocation for Embedded UAV Communication Systems
We consider device-to-device (D2D) wireless information and power transfer
systems using an unmanned aerial vehicle (UAV) as a relay-assisted node. As the
energy capacity and flight time of UAVs is limited, a significant issue in
deploying UAV is to manage energy consumption in real-time application, which
is proportional to the UAV transmit power. To tackle this important issue, we
develop a real-time resource allocation algorithm for maximizing the energy
efficiency by jointly optimizing the energy-harvesting time and power control
for the considered (D2D) communication embedded with UAV. We demonstrate the
effectiveness of the proposed algorithms as running time for solving them can
be conducted in milliseconds.Comment: 11 pages, 5 figures, 1 table. This paper is accepted for publication
on IEEE Wireless Communications Letter
MIMO Beamforming for Secure and Energy-Efficient Wireless Communication
Considering a multiple-user multiple-input multiple-output (MIMO) channel
with an eavesdropper, this letter develops a beamformer design to optimize the
energy efficiency in terms of secrecy bits per Joule under secrecy
quality-of-service constraints. This is a very difficult design problem with no
available exact solution techniques. A path-following procedure, which
iteratively improves its feasible points by using a simple quadratic program of
moderate dimension, is proposed. Under any fixed computational tolerance the
procedure terminates after finitely many iterations, yielding at least a
locally optimal solution. Simulation results show the superior performance of
the obtained algorithm over other existing methods.Comment: 12 pages, 2 figure
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