Experimental System for Molecular Communication in Pipe Flow With Magnetic Nanoparticles

TL;DR

This paper introduces a flexible in-vessel testbed for molecular communication using magnetic nanoparticles in pipe flow, providing experimental validation and a parametric channel model for system design.

Contribution

The paper presents a novel testbed for flow-based molecular communication with magnetic nanoparticles and derives a closed-form channel impulse response model validated by experiments.

Findings

Successful demonstration of reliable communication using magnetic nanoparticles

The channel model accurately predicts impulse response characteristics

Experimental validation over distances from 5cm to 40cm

Abstract

In the emerging field of molecular communication (MC), testbeds are needed to validate theoretical concepts, motivate applications, and guide further modeling efforts. To this end, this paper presents a flexible and extendable in-vessel testbed for flow-based macroscopic MC, abstractly modeling, e.g., a part of a chemical reactor or a blood vessel. Signaling is based on injecting non-reactive superparamagnetic iron oxide nanoparticles (SPIONs) dispersed in an aqueous suspension into a tube with background flow. A commercial magnetic susceptometer is used for non-intrusive downstream signal reception. To shed light on the operation of the testbed, we identify the physical mechanisms governing the transmission, propagation, and reception of the information-carrying SPIONs. Moreover, to facilitate system design, we propose a closed-form parametric expression for the end-to-end channel impulse response (CIR). The proposed CIR model is shown to consistently capture the experimentally observed distance-dependent impulse response peak heights and peak decays for transmission distances from 5cm to 40cm. Moreover, to validate our testbed, reliable communication is demonstrated based on experimental data for model-agnostic and model-based detection methods.