33 research outputs found
Simultaneous wireless data and power transfer for a 1-Gb/s GaAs VCSEL and photovoltaic link
We study the trade-off between energy harvesting and data communication for a two-meter wireless gallium-arsenide vertical-cavity surface-emitting laser and photovoltaic link. The use of orthogonal frequency-division multiplexing with adaptive bit and power loading results in a peak data rate of 1041 Mb/s at a bit-error ratio (BER) of 2.2\times 10^{-3} under short-circuit conditions. The receiver is shown to provide power harvesting with an efficiency of 41.7% under the irradiance of 0.3 W/cm2 and simultaneous data communication with a rate of 784 Mb/s at a BER of 2.8\times 10^{-3}. The experimental system is envisioned to become a paradigm for next-generation wireless backhaul communications and Internet-of-Things applications
Reconfigurable Intelligent Surface Assisted Free Space Optical Information and Power Transfer
Free space optical (FSO) transmission has emerged as a key candidate
technology for 6G to expand new spectrum and improve network capacity due to
its advantages of large bandwidth, low electromagnetic interference, and high
energy efficiency. Resonant beam operating in the infrared band utilizes
spatially separated laser cavities to enable safe and mobile high-power energy
and high-rate information transmission but is limited by line-of-sight (LOS)
channel. In this paper, we propose a reconfigurable intelligent surface (RIS)
assisted resonant beam simultaneous wireless information and power transfer
(SWIPT) system and establish an optical field propagation model to analyze the
channel state information (CSI), in which LOS obstruction can be detected
sensitively and non-line-of-sight (NLOS) transmission can be realized by
changing the phased of resonant beam in RIS. Numerical results demonstrate
that, apart from the transmission distance, the NLOS performance depends on
both the horizontal and vertical positions of RIS. The maximum NLOS energy
efficiency can achieve 55% within a transfer distance of 10m, a translation
distance of 4mm, and rotation angle of 50{\deg}