Federated Learning with Gramian Angular Fields for Privacy-Preserving ECG Classification on Heterogeneous IoT Devices

TL;DR

This paper introduces a federated learning framework using Gramian Angular Fields for privacy-preserving ECG classification on heterogeneous IoT devices, demonstrating high accuracy and efficiency in edge-cloud healthcare settings.

Contribution

It is among the first to validate GAF-based federated ECG classification across diverse IoT devices, combining privacy, efficiency, and high accuracy.

Findings

Achieved 95.18% classification accuracy in multi-client setup

Demonstrated high performance across heterogeneous IoT devices

Maintained efficient resource utilization and communication overhead

Abstract

This study presents a federated learning (FL) framework for privacy-preserving electrocardiogram (ECG) classification in Internet of Things (IoT) healthcare environments. By transforming 1D ECG signals into 2D Gramian Angular Field (GAF) images, the proposed approach enables efficient feature extraction through Convolutional Neural Networks (CNNs) while ensuring that sensitive medical data remain local to each device. This work is among the first to experimentally validate GAF-based federated ECG classification across heterogeneous IoT devices, quantifying both performance and communication efficiency. To evaluate feasibility in realistic IoT settings, we deployed the framework across a server, a laptop, and a resource-constrained Raspberry Pi 4, reflecting edge-cloud integration in IoT ecosystems. Experimental results demonstrate that the FL-GAF model achieves a high classification accuracy of 95.18% in a multi-client setup, significantly outperforming a single-client baseline in both accuracy and training time. Despite the added computational complexity of GAF transformations, the framework maintains efficient resource utilization and communication overhead. These findings highlight the potential of lightweight, privacy-preserving AI for IoT-based healthcare monitoring, supporting scalable and secure edge deployments in smart health systems.