EH Modelling and Achievable Rate for FSO SWIPT Systems with Non-linear Photovoltaic Receivers

Shanin N, Ajam H, Papanikolaou V, Schmauß B, Cottatellucci L, Schober R (2025)

Publication Status: Submitted

Publication Type: Unpublished / Preprint

Future Publication Type: Journal article

Publication year: 2025

Abstract

In this paper, we study optical simultaneous wireless information and power transfer (SWIPT) systems, where a photovoltaic optical receiver (RX) is illuminated by ambient light and an intensity-modulated free space optical (FSO) signal. To facilitate simultaneous information reception and energy harvesting (EH) at the RX, the received optical signal is first converted to an electrical signal, and then, its alternating current (AC) and direct current (DC) components are separated and utilized for information decoding and EH, respectively. By accurately analysing the equivalent electrical circuit of the photovoltaic RX, we model the current flow through the photovoltaic p-n junction in both the low and high input power regimes using a two-diode model of the p-n junction and we derive a closed-form non-linear EH model that characterizes the harvested power at the RX. Furthermore, taking into account the non-linear behaviour of the photovoltaic RX on information reception, we derive the optimal distribution of the transmit information signal that maximizes the achievable information rate. The proposed EH model is validated by circuit simulation results. Furthermore, we compare with two baseline models based on maximum power point (MPP) tracking at the RX and a single-diode p-n junction model, respectively, and demonstrate that in contrast to the proposed EH model, they are not able to fully capture the non-linearity of photovoltaic optical RXs. Finally, our numerical results highlight that the proposed optimal distribution of the transmit signal yields significantly higher achievable information rates compared to uniformly distributed transmit signals, which are optimal for linear optical information RXs.

Authors with CRIS profile

Nikita Shanin Lehrstuhl für Digitale Übertragung (IDC) Hedieh Ajam Lehrstuhl für Digitale Übertragung (IDC) Vasileios Papanikolaou Lehrstuhl für Digitale Übertragung (IDC) Bernhard Schmauß Professur für Hochfrequenztechnik mit dem Schwerpunkt Optische Hochfrequenztechnik und Photonik Laura Cottatellucci Professur für Digitale Übertragung Robert Schober Lehrstuhl für Digitale Übertragung (IDC)

Additional Organisation(s)

Sonderforschungsbereich 1483/1 Empathokinästhetische Sensorik – Sensortechniken und Datenanalyseverfahren zur empathokinästhetischen Modellbildung und Zustandsbestimmung (EmpkinS)

How to cite

APA:

Shanin, N., Ajam, H., Papanikolaou, V., Schmauß, B., Cottatellucci, L., & Schober, R. (2025). EH Modelling and Achievable Rate for FSO SWIPT Systems with Non-linear Photovoltaic Receivers. (Unpublished, Submitted).

MLA:

Shanin, Nikita, et al. EH Modelling and Achievable Rate for FSO SWIPT Systems with Non-linear Photovoltaic Receivers. Unpublished, Submitted. 2025.

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