Simultaneous Information and Power Transfer under a Non-Linear RF Energy Harvesting Model
Paper in proceedings, 2017

In the design of simultaneous wireless information and power transfer (SWIPT) systems, it has been typically as- sumed that energy conversion efficiency is independent from the level of the input power at the energy receiver. On the other hand, in practice the energy conversion efficiency exhibits a non- linear behavior and highly depends on the input power. This leads to a discrepancy between the practical energy harvesting (EH) hardware available and the resource allocation designs made for the SWIPT systems. This work is concerned with this issue. In particular, we propose a practical quadratic model for the power conversion efficiency in EH circuitry. Comparisons with the constant efficiency models used in conventional SWIPT system design as well as another non-linear model proposed in the literature are made. With its convexity properties together with the good match it provides for the measurement data from practical EH circuitry, the proposed model is shown to be a promising alternative to the existing EH approaches. Using the proposed model, the problem of resource allocation for a multi- user Orthogonal Frequency-Division Multiple Access (OFDMA) system is investigated. The performance improvement due to the usage of the proposed non-linear model is illustrated.

Author

Xiaowei Xu

Chalmers, Signals and Systems

Ayca Ozcelikkale

Signals and Systems, Signalbehandling och medicinsk teknik, Signal Processing

Tomas McKelvey

Signals and Systems, Signalbehandling och medicinsk teknik, Signal Processing

Mats Viberg

Signals and Systems, Signalbehandling och medicinsk teknik, Signal Processing

IEEE International Conference on Communications Workshops (ICC) (2017)

179-184 7962654

Areas of Advance

Information and Communication Technology

Energy

Subject Categories

Communication Systems

Electrical Engineering, Electronic Engineering, Information Engineering

Signal Processing

DOI

10.1109/ICCW.2017.7962654

ISBN

978-150901525-2