On the Capacity of SWIPT Systems with a Nonlinear Energy Harvesting Circuit

Morsi R, Jamali Kooshkghazi V, Ng DWK, Schober R (2018)

Publication Language: English

Publication Type: Conference contribution

Publication year: 2018

Conference Proceedings Title: IEEE International Conference on Communications (ICC)

Event location: Kansas City, Missouri US

URI: https://ieeexplore.ieee.org/document/8422269/

DOI: 10.1109/ICC.2018.8422269

Abstract

In this paper, we study information-theoretic limits for simultaneous wireless information and power

transfer (SWIPT) systems employing a practical nonlinear radio frequency (RF) energy harvesting (EH)

receiver. In particular, we consider a three-node system with one transmitter that broadcasts a common

signal to separated information decoding (ID) and EH receivers. Owing to the nonlinearity of the EH

receiver circuit, the efficiency of wireless power transfer depends significantly on the waveform of the

transmitted signal. In this paper, we aim to answer the following fundamental question: What is the

optimal input distribution of the transmit waveform that maximizes the rate of the ID receiver for a

given required harvested power at the EH receiver? In particular, we study the capacity of a SWIPT

system impaired by additive white Gaussian noise (AWGN) under average-power (AP) and peak-power

(PP) constraints at the transmitter and an EH constraint at the EH receiver. Using Hermite polynomial

bases, we prove that the optimal capacity-achieving input distribution that maximizes the rate-energy

region is unique and discrete with a finite number of mass points. Our numerical results show that the

rate-energy region is enlarged for a larger PP constraint and that the rate loss of the considered SWIPT

system compared to the AWGN channel without EH receiver is reduced by increasing the AP budget.

Authors with CRIS profile

Rania Morsi Lehrstuhl für Digitale Übertragung (IDC) Vahid Jamali Kooshkghazi Lehrstuhl für Digitale Übertragung (IDC) Robert Schober Lehrstuhl für Digitale Übertragung (IDC)

Involved external institutions

University of New South Wales (UNSW) AU Australia (AU)

How to cite

APA:

Morsi, R., Jamali Kooshkghazi, V., Ng, D.W.K., & Schober, R. (2018). On the Capacity of SWIPT Systems with a Nonlinear Energy Harvesting Circuit. In IEEE International Conference on Communications (ICC). Kansas City, Missouri, US.

MLA:

Morsi, Rania, et al. "On the Capacity of SWIPT Systems with a Nonlinear Energy Harvesting Circuit." Proceedings of the International Conference on Communications (ICC), Kansas City, Missouri 2018.

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