# Tone-index Multisine Modulation for SWIPT

## TL;DR

This paper introduces a novel SWIPT technique using tone-index modulation of multisine waveforms, enabling efficient energy harvesting and simple non-coherent detection without channel estimation.

## Contribution

It presents a new modulation scheme for SWIPT that embeds information in the tone index of multisine signals, improving energy harvesting and reducing receiver complexity.

## Key findings

- Outperforms peak-to-average-power-ratio modulation in error probability
- Enables non-coherent detection without channel estimation
- Achieves efficient RF energy harvesting and low-complexity info transmission

## Abstract

We propose a new simultaneous wireless information and power transfer (SWIPT) technique that embeds information bits in the tone-index of multisine waveforms. By varying the number of subcarriers of the transmitted bandwidth-constrained multisine signal, the proposed scheme enables efficient radio-frequency energy harvesting and low-complexity information transmission. The receiver does not require channel estimation and employs a non-coherent maximum-likelihood detection at the envelope of the received signal. The performance of the proposed tone-index modulation is evaluated in terms of average error probability for a flat-fading channel, and we show that it outperforms its peak-to-average-power-ratio counterpart.