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In traditional Fog-Radio Access Networks (F-RANs), enhanced remote radio heads (eRRHs) are connected to a macro base station (MBS) through fronthaul links. Deploying a massive number of eRRHs is not always feasible due to site constraints…

Information Theory · Computer Science 2024-08-30 Hesameddin Mokhtarzadeh , Mohammed S. Al-Abiad , Md Jahangir Hossain , Julian Cheng

This paper explores the evolution of Radio Access Network (RAN) architectures and their integration into Non-Terrestrial Networks (NTN) to address escalating mobile traffic demands. Focusing on Low Earth Orbit (LEO) satellites as key…

Networking and Internet Architecture · Computer Science 2024-04-16 Siva Satya Sri Ganesh Seeram , Luca Feltrin , Mustafa Ozger , Shuai Zhang , Cicek Cavdar

Low Earth Orbit (LEO) satellites are emerging as key components of 6G networks, with many already deployed to support large-scale Earth observation and sensing related tasks. Federated Learning (FL) presents a promising paradigm for…

Distributed, Parallel, and Cluster Computing · Computer Science 2025-07-31 Zhuocheng Liu , Zhishu Shen , Qiushi Zheng , Tiehua Zhang , Zheng Lei , Jiong Jin

In this paper, a multi-user multi-hop hybrid FSO / RF system is presented. This structure is consisted of two main parts. The main motivation of presenting this structure is communication in long-range impassable links or some specific…

Signal Processing · Electrical Eng. & Systems 2018-11-21 Mohammad Ali Amirabadi

Networked low Earth orbit (LEO) satellite constellations enabled by inter-satellite links offer a promising path toward ubiquitous broadband non-terrestrial services. However, fast orbital motion induces frequent scheduling updates and…

Signal Processing · Electrical Eng. & Systems 2026-03-10 Yuchen Zhang , Eva Lagunas , Symeon Chatzinotas , Tareq Y. Al-Naffouri

Free-space optical (FSO) communication requires light of sight (LoS) between the transmitter and the receiver. For long-distance communication, many research projects have been conducted towards using a network composed of high-altitude…

Networking and Internet Architecture · Computer Science 2023-01-23 Dieu Linh Truong , The Ngoc Dang

This paper investigates joint device identification, channel estimation, and signal detection for LEO satellite-enabled grant-free random access, where a multiple-input multipleoutput (MIMO) system with orthogonal time-frequency space…

Information Theory · Computer Science 2023-08-08 Boxiao Shen , Yongpeng Wu , Wenjun Zhang , Symeon Chatzinotas , Björn Ottersten

Low Earth Orbit (LEO) satellite constellations have seen a surge in deployment over the past few years by virtue of their ability to provide broadband Internet access as well as to collect vast amounts of Earth observational data that can…

Machine Learning · Computer Science 2022-09-27 Mohamed Elmahallawy , Tie Luo

In massive multiple-input multiple-output (MIMO) systems, the downlink transmission performance heavily relies on accurate channel state information (CSI). Constrained by the transmitted power, user equipment always transmits sounding…

Signal Processing · Electrical Eng. & Systems 2024-10-23 Yiming Zhu , Jiawei Zhuang , Gangle Sun , Hongwei Hou , Li You , Wenjin Wang

An accurate predictor is crucial for histogram-shifting (HS) based reversible data hiding methods. The embedding capacity is increased and the embedding distortion is decreased simultaneously if the predictor can generate accurate…

Multimedia · Computer Science 2015-07-30 Xiaochao Qu , Suah Kim , Run Cui , Hyoung Joong Kim

The Low Earth Orbit (LEO) satellite industry is undergoing rapid expansion, with operators competitively launching satellites due to the first-come, first-served principle governing orbital rights. This has led to the formation of…

Information Theory · Computer Science 2025-11-04 Seyong Kim , Jinseok Choi , Namyoon Lee , François Baccelli , Jeonghun Park

Low Earth orbit (LEO) satellite mega-constellation networks aim to address the high connectivity demands with a projected 50,000 satellites in less than a decade. To fully utilize such a large-scale dynamic network, an air network composed…

Signal Processing · Electrical Eng. & Systems 2022-06-28 Eray Güven , Güneş Karabulut Kurt

One of the main problems in mobile communication systems is the degradation of Radio Frequency (RF) connection when mobile user is far from base station. One way to solve this problem is to increase the transmitter power, but the mobile…

Signal Processing · Electrical Eng. & Systems 2018-11-21 Mohammad Ali Amirabadi

The construction of Low Earth Orbit (LEO) satellite constellations has recently attracted tremendous attention from both academia and industry. The 5G and 6G standards have identified LEO satellite networks as a key component of future…

Networking and Internet Architecture · Computer Science 2025-07-11 Jiasheng Wu , Shaojie Su , Wenjun Zhu , Xiong Wang , Jingjing Zhang , Xingqiu He , Yue Gao

The advancements of remote sensing (RS) pose increasingly high demands on computation and transmission resources. Conventional ground-offloading techniques, which transmit large amounts of raw data to the ground, suffer from poor…

Networking and Internet Architecture · Computer Science 2022-11-17 Jiaqi Cao , Shengli Zhang , Qingxia Chen , Houtian Wang , Mingzhe Wang , Naijin Liu

As dense low Earth orbit (LEO) constellations are being planned, the need for accurate synchronization schemes in high-speed environments remains a challenging problem to tackle. To further improve synchronization accuracy in channeling…

Signal Processing · Electrical Eng. & Systems 2022-10-04 Rıfat Volkan Şenyuva , Güneş Karabulut Kurt

Low Earth orbit (LEO) satellite constellations are emerging as a key enabler of next-generation communications, offering global coverage and significantly lower latency compared to traditional terrestrial networks and geostationary…

Signal Processing · Electrical Eng. & Systems 2025-07-01 Mohammad Taghi Dabiri , Mazen Hasna , Saud Althunibat , Khalid Qaraqe

Recovering ghost-free High Dynamic Range (HDR) images from multiple Low Dynamic Range (LDR) images becomes challenging when the LDR images exhibit saturation and significant motion. Recent Diffusion Models (DMs) have been introduced in HDR…

Computer Vision and Pattern Recognition · Computer Science 2024-04-02 Tao Hu , Qingsen Yan , Yuankai Qi , Yanning Zhang

The presence of a super high rate, but also cost-efficient, easy-to-deploy, and scalable, backhaul/fronthaul framework is essential in the upcoming fifth-generation (5G) wireless networks \& beyond. Motivated by the mounting interest in the…

Networking and Internet Architecture · Computer Science 2017-05-05 Mohamed Alzenad , Muhammad Zeeshan Shakir , Halim Yanikomeroglu , Mohamed-Slim Alouini

The applications of the unmanned aerial vehicles (UAVs) increase rapidly in everyday life, thus detecting the UAVs and/or its pilot is a crucial task. Many UAVs adopt frequency hopping spread spectrum (FHSS) technology to efficiently and…

Signal Processing · Electrical Eng. & Systems 2020-03-10 Batuhan Kaplan , İbrahim Kahraman , Ali Görçin , Hakan Ali Çırpan , Ali Rıza Ekti