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Terahertz (THz) communication is a key enabler for 6G systems, offering ultra-wide bandwidth and unprecedented data rates. However, THz signal propagation differs significantly from lower-frequency bands due to severe free space path loss,…

Signal Processing · Electrical Eng. & Systems 2025-05-13 John Song , Lihao Zhang , Feng Ye , Haijian Sun

Federated learning (FL), as an emerging distributed machine learning paradigm, allows a mass of edge devices to collaboratively train a global model while preserving privacy. In this tutorial, we focus on FL via over-the-air computation…

Machine Learning · Computer Science 2023-10-17 Jingyang Zhu , Yuanming Shi , Yong Zhou , Chunxiao Jiang , Wei Chen , Khaled B. Letaief

Federated learning (FL) is a new paradigm for distributed machine learning that allows a global model to be trained across multiple clients without compromising their privacy. Although FL has demonstrated remarkable success in various…

Machine Learning · Computer Science 2023-06-06 Haolin Wang , Xuefeng Liu , Jianwei Niu , Shaojie Tang , Jiaxing Shen

The combination of Terahertz (THz) and massive multiple-input multiple-output (MIMO) is promising to meet the increasing data rate demand of future wireless communication systems thanks to the huge bandwidth and spatial degrees of freedom.…

Information Theory · Computer Science 2024-08-14 Jiabao Gao , Xiaoming Cheng , Geoffrey Ye Li

Terahertz (THz)-band communications are celebrated as a key enabling technology for next-generation wireless systems that promises to integrate a wide range of data-demanding and delay-sensitive applications. Following recent advancements…

Signal Processing · Electrical Eng. & Systems 2020-05-04 Hadi Sarieddeen , Nasir Saeed , Tareq Y. Al-Naffouri , Mohamed-Slim Alouini

Terahertz (THz) communications are regarded as a pillar technology for the sixth generation (6G) wireless systems, by offering multi-ten-GHz bandwidth. To overcome the short transmission distance and huge propagation loss, ultra-massive…

Information Theory · Computer Science 2021-10-06 Chong Han , Longfei Yan , Jinhong Yuan

The terahertz (THz) frequency band (0.3-10THz) has the advantage of large available bandwidth and is a candidate to satisfy the ever increasing mobile traffic in wireless communications. However, the THz channels are often absorbed by…

Networking and Internet Architecture · Computer Science 2021-06-08 Cao Vien Phung , Anna Engelmann , Admela Jukan

Federated learning (FL) is an effective paradigm for enhancing the learning capability of edge devices while preserving data privacy. In geographically dispersed FL systems, such as sensor networks in remote areas, unmanned aerial vehicles…

Machine Learning · Computer Science 2026-05-26 Shiqian Guo , Jianqing Liu , Beatriz Lorenzo

Large multiple antenna arrays coupled with accurate beamforming are essential in terahertz (THz) communications to ensure link reliability. However, as the number of antennas increases, beam alignment (focusing) and beam tracking in mobile…

Systems and Control · Electrical Eng. & Systems 2025-11-04 Irched Chafaa , E. Veronica Belmega , Giacomo Bacci

Bayesian learning aided massive antenna array based THz MIMO systems are designed for spatial-wideband and frequency-wideband scenarios, collectively termed as the dual-wideband channels. Essentially, numerous antenna modules of the THz…

Signal Processing · Electrical Eng. & Systems 2024-02-20 Abhisha Garg , Suraj Srivastava , Nimish Yadav , Aditya K. Jagannatham , Lajos Hanzo

This paper focuses on delivering quantified results for the evaluation of the aggregated impact of stochastic antenna misalignment, multipath fading and hardware imperfections on the terahertz (THz) wireless fiber extenders. In this line,…

Information Theory · Computer Science 2019-10-07 Evangelos N. Papasotiriou , Alexandros-Apostolos A. Boulogeorgos , Angeliki Alexiou

Terahertz (THz) communication offers a promising solution for high-throughput wireless systems. However, the severe path loss of THz signals raises concerns about its effectiveness compared to radio frequency (RF) communication. In this…

Networking and Internet Architecture · Computer Science 2025-08-12 Zhengying Lou , Baha Eddine Youcef Belmekki , Mohamed-Slim Alouini

Vertical federated learning (FL) is a collaborative machine learning framework that enables devices to learn a global model from the feature-partition datasets without sharing local raw data. However, as the number of the local intermediate…

Information Theory · Computer Science 2023-05-11 Yuanming Shi , Shuhao Xia , Yong Zhou , Yijie Mao , Chunxiao Jiang , Meixia Tao

Federated learning (FL) has recently emerged as an important and promising learning scheme in IoT, enabling devices to jointly learn a model without sharing their raw data sets. However, as the training data in FL is not collected and…

Machine Learning · Computer Science 2021-05-04 Shuo Wan , Jiaxun Lu , Pingyi Fan , Yunfeng Shao , Chenghui Peng , Khaled B. letaief

Federated learning (FL) is an attractive paradigm for making use of rich distributed data while protecting data privacy. Nonetheless, nonideal communication links and limited transmission resources may hinder the implementation of fast and…

Machine Learning · Computer Science 2022-02-11 Xin Fan , Yue Wang , Yan Huo , Zhi Tian

Federated learning (FL) has emerged as a promising framework for distributed learning, enabling collaborative model training without sharing private data. Existing wireless FL works primarily adopt two communication strategies: (1)…

Machine Learning · Computer Science 2026-04-16 Muhammad Faraz Ul Abrar , Nicolò Michelusi

Wireless federated learning (WFL) suffers from heterogeneity prevailing in the data distributions, computing powers, and channel conditions of participating devices. This paper presents a new Federated Learning with Adjusted leaRning ratE…

Signal Processing · Electrical Eng. & Systems 2024-04-24 Bingnan Xiao , Jingjing Zhang , Wei Ni , Xin Wang

Federated learning (FL) has emerged as a widely adopted paradigm for enabling edge learning with distributed data while ensuring data privacy. However, the traditional FL with deep neural networks trained via backpropagation can hardly meet…

Machine Learning · Computer Science 2025-11-05 Jierui Zhang , Jianhao Huang , Kaibin Huang

Federated Learning (FL) enables mobile edge devices, functioning as clients, to collaboratively train a decentralized model while ensuring local data privacy. However, the efficiency of FL in wireless networks is limited not only by…

Distributed, Parallel, and Cluster Computing · Computer Science 2026-01-01 Yanbing Yang , Huiling Zhu , Wenchi Cheng , Jingqing Wang , Changrun Chen , Jiangzhou Wang

Recently, federated learning (FL) has sparked widespread attention as a promising decentralized machine learning approach which provides privacy and low delay. However, communication bottleneck still constitutes an issue, that needs to be…

Signal Processing · Electrical Eng. & Systems 2022-03-14 Pavlos S. Bouzinis , Panagiotis D. Diamantoulakis , George K. Karagiannidis