Chaotic Waveform-based Signal Design for Noncoherent SWIPT Receivers

TL;DR

This paper introduces a chaotic waveform-based multi-antenna receiver architecture for SWIPT, analyzing the trade-offs between information transfer and energy harvesting, and proposing waveform designs tailored to specific application needs.

Contribution

It presents a novel DCSK-based SWIPT receiver design with analytical expressions for BER and harvested energy, highlighting the conflicting nature of IT and EH tasks and proposing optimized waveform strategies.

Findings

Chaotic waveform design significantly impacts BER and energy harvesting performance.

A trade-off exists between information transfer quality and energy harvesting efficiency.

Waveform optimization can enhance either IT or EH based on application requirements.

Abstract

This paper proposes a chaotic waveform-based multi-antenna receiver design for simultaneous wireless information and power transfer (SWIPT). Particularly, we present a differential chaos shift keying (DCSK)-based SWIPT multiantenna receiver architecture, where each antenna switches between information transfer (IT) and energy harvesting (EH) modes depending on the receiver's requirements. We take into account a generalized frequency-selective Nakagami-m fading model as well as the nonlinearities of the EH process to derive closed-form analytical expressions for the associated bit error rate (BER) and the harvested direct current (DC), respectively. We show that, both depend on the parameters of the transmitted waveform and the number of receiver antennas being utilized in the IT and EH mode. We investigate a trade-off in terms of the BER and energy transfer by introducing a novel achievable `success rate - harvested energy' region. Moreover, we demonstrate that energy and information transfer are two conflicting tasks and hence, a single waveform cannot be simultaneously optimal for both IT and EH. Accordingly, we propose appropriate transmit waveform designs based on the application specific requirements of acceptable BER or harvested DC or both. Numerical results demonstrate the importance of chaotic waveform-based signal design and its impact on the proposed receiver architecture.