Multi Ratio Shift Keying (MRSK) for Molecular Communication

TL;DR

This paper introduces Multi Ratio Shift Keying (MRSK), a novel modulation technique for molecular communication that encodes information in molecule ratios, significantly reducing errors and outperforming traditional schemes.

Contribution

The paper proposes MRSK, a new modulation method leveraging molecule ratios to improve communication reliability in diffusion-based molecular communication systems.

Findings

MRSK outperforms traditional modulation schemes in bit error rate.

Mathematical framework for ratio statistics in noncentral Gaussian distributions.

Simulation results confirm MRSK's robustness and flexibility.

Abstract

Molecular Communication (MC) leverages the power of diffusion to transmit molecules from a transmitter to a receiver. A wide variety of modulation techniques based on molecule concentration, type, and release time have been extensively studied in the literature. In this paper, we propose a novel modulation technique that encodes the information into the relative concentrations of multiple molecules called Multi Ratio Shift Keying (MRSK) designed for diffusion-based MC without drift. We show that leveraging all possible ratios in a set of molecules can help mitigate the effects of intersymbol interference (ISI) and provide a flexible communication channel. To evaluate the performance of the MRSK, we develop a mathematical framework for studying the statistics of the ratio of random variables, focusing on noncentral Gaussian distributions. We then assess MRSK performance both analytically and through particle-based simulations under various channel conditions, identifying potential sources of error in our system model. Additionally, we conduct a comparative analysis of commonly used modulation schemes in the literature based on bit error rate (BER). The results show that MRSK significantly outperforms all traditional modulation schemes considered in this study in terms of BER. MRSK offers a promising, flexible, and more reliable communication method for the future of the MC paradigm.