Kavli Affiliate: Long Zhang
| First 5 Authors: Long Zhang, Yizhe Zhao, Halvin Yang, Guangming Liang, Jie Hu
| Summary:
Integrated data and energy transfer (IDET) is considered as a key enabler of
6G, as it can provide both wireless energy transfer (WET) and wireless data
transfer (WDT) services towards low power devices. Thanks to the extra degree
of freedom provided by fluid antenna (FA), incorporating FA into IDET systems
presents a promising approach to enhance energy efficiency performance. This
paper investigates a FA assisted IDET system, where the transmitter is equipped
with multiple FAs and transmits wireless signals to the data receiver (DR) and
the energy receiver (ER), which are both equipped with a single traditional
antenna. The switching delay and energy consumption induced by port selection
are taken into account in IDET system for the first time. We aim to obtain the
optimal beamforming vector and the port selection strategy at the transmitter,
in order to maximize the short-term and long-term WET efficiency, respectively.
The instant sub-optimal solution is obtained by alternatively optimizing the
beamforming vector and port selection in each transmission frame, while a novel
constrained soft actor critic (C-SAC) algorithm is proposed to find the
feasible policy of port selection from the long-term perspective. Simulation
results demonstrate that our scheme is able to achieve greater gain in terms of
both the short-term and long-term WET efficiency compared to other benchmarks,
while not degrading WDT performance.
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