Differential Chaos Shift Keying-based Wireless Power Transfer over a Frequency Selective Channel

TL;DR

This paper analyzes the performance of DCSK-based wireless power transfer over frequency selective channels, deriving analytical expressions for harvested energy considering channel and waveform effects, and providing design insights.

Contribution

It introduces a comprehensive analytical framework for DCSK-based WPT in frequency selective channels, including effects of nonlinear energy harvesting and channel parameters.

Findings

Frequency selectivity can enhance WPT performance.

Delay spread negatively impacts energy harvesting.

Channel power delay profile influences harvested energy.

Abstract

This paper studies the performance of a differential chaos shift keying (DCSK)-based wireless power transfer (WPT) setup in a frequency selective scenario. Particularly, by taking into account the nonlinearities of the energy harvesting (EH) process and a generalized frequency selective Nakagami-m fading channel, we derive closed-form analytical expressions for the harvested energy in terms of the transmitted waveform and channel parameters. A simplified closed-form expression for the harvested energy is also obtained for a scenario, where the delay spread is negligible in comparison to the transmit symbol duration. Nontrivial design insights are provided, where it is shown how the power delay profile of the channel as well as the parameters of the transmitted waveform affect the EH performance. Our results show that a frequency selective channel is comparatively more beneficial for WPT compared to a flat fading scenario. However, a significant delay spread negatively impacts the energy transfer.