We study over-the-air model aggregation in federated edge learning (FEEL) systems, where channel state information at the transmitters (CSIT) is assumed to be unavailable. We leverage the reconfigurable intelligent surface (RIS) technology to align the cascaded channel coefficients for CSIT-free model aggregation. To this end, we jointly optimize the RIS and the receiver by minimizing the aggregation error under the channel alignment constraint. We then develop a difference-of-convex algorithm for the resulting non-convex optimization. Numerical experiments on image classification show that the proposed method is able to achieve a similar learning accuracy as the state-of-the-art CSIT-based solution, demonstrating the efficiency of our approach in combating the lack of CSIT.
@article{arxiv.2102.10749,
title = {CSIT-Free Model Aggregation for Federated Edge Learning via Reconfigurable Intelligent Surface},
author = {Hang Liu and Xiaojun Yuan and Ying-Jun Angela Zhang},
journal= {arXiv preprint arXiv:2102.10749},
year = {2024}
}
Comments
This work has been submitted to the IEEE for possible publication