Results 231 to 240 of about 2,688,437 (267)

DQN-Based Scheduling Algorithm for Beam-Hopping LEO Satellite Communication Systems

IEEE Wireless Communications Letters
This letter investigates a downlink scheduling method in beam-hopping (BH) low-Earth orbit (LEO) satellite communication systems, aiming to minimize power consumption while meeting traffic demands.
Donghyeon Kim, Haejoon Jung, In-Ho Lee
semanticscholar   +1 more source

Extended DL Coverage in SAGIN: Cell Association and Resource Allocation With Beam Hopping LEO

IEEE Internet of Things Journal
Realizing the potential of low-Earth orbit (LEO)-based space-air–ground integrated networks requires mitigating challenges associated with LEO satellites, such as limited on-board resources, extended downlink (DL) coverage, temporal variability, and ...
P. Eberechukwu N., M. Onyekwelu, Dongweon Yoon   +2 more
semanticscholar   +1 more source

A Multi-Agent Reinforcement Learning Based Cooperative Beam Hopping Scheme for LEO Mega Constellation Networks

IEEE Wireless Communications and Networking Conference
The LEO (Low Earth Orbit) mega constellation network with beam-hopping scheme has become a promising approach to provide global communications. Most of the research on the beam-hopping scheme design for LEO constellation network has focused on beam ...
Chao-Yu Ren, Feng Tian, Yanchun Zhao, Wenqian Wang, Ziheng Yang, Yue Gao, Huijie Liu   +6 more
semanticscholar   +1 more source

Real-Time Digital Predistortion for Rapid Beam Hopping in LEO Satellites

IEEE Communications Letters
Fully-connected (FC) hybrid beamforming (HBF) has become crucial in low Earth orbit (LEO) satellite communications. However, severe power amplifier (PA) nonlinearities arise due to high power demands.
Yao-Hua Deng, Zhong-Liang Deng, Ke Wang, Wenliang Lin, Yiyuan Wei   +4 more
semanticscholar   +1 more source

Beam-Hopping Pattern Design for Grant-Free Random Access in LEO Satellite Communications

IEEE Transactions on Wireless Communications
Increasing demand for massive device connectivity in underserved regions drives the development of advanced low Earth orbit (LEO) satellite communication systems.
Seunghyeon Jeon, Seonjung Kim, Gyeongrae Im, Yo-Seb Jeon   +3 more
semanticscholar   +1 more source

Joint Design of Beam Hopping and Precoding for RSMA-Enabled LEO Satellite Internet of Things

IEEE Internet of Things Journal
Low-earth orbit (LEO) satellite Internet of Things (IoT) has emerged as a promising solution to address the limitations of terrestrial IoT by providing global coverage and seamless connectivity.
Xi Han, Shibing Zhu, Yi-Jie Mao, Huanxi Cui, Rong-Ke Liu, Jian-Mei Dai   +5 more
semanticscholar   +1 more source

Joint Beamforming and Illumination Pattern Design for Beam-Hopping LEO Satellite Communications

IEEE Transactions on Wireless Communications
Since hybrid beamforming (HBF) can approach the performance of fully-digital beamforming (FDBF) with much lower hardware complexity, we investigate the HBF design for beam-hopping (BH) low earth orbit (LEO) satellite communications (SatComs).
Jing Wang, Chen-Hao Qi, Shui Yu, Shiwen Mao   +3 more
semanticscholar   +1 more source

Multi-Agent DDPG-Based Joint Beam Hopping and Resource Allocation for Cognitive GEO-LEO Satellite Networks

IEEE Networking Letters
This letter presents a multi-agent deep reinforcement learning-based framework for joint beam hopping and resource allocation in the secondary LEO system within a cognitive GEO-LEO satellite network.
Q. Ngo, Ying He, B. Jayawickrama, E. Dutkiewicz   +3 more
semanticscholar   +1 more source

DRX Mechanism for Beam Hopping Satellite Systems: Balancing UE Power Saving and Satellite Efficiency

IEEE Transactions on Communications
Mobile user equipment (UE) which can connect to satellites directly attracts increasing attention. Power consumption is one of the most significant challenges for mobile UEs.
Bing-Kun Liu, Lin-Ling Kuang, Kai Chang, Jian-Hua Lu   +3 more
semanticscholar   +1 more source

Multi-Satellite Cooperative Load-Balancing Scheme Based on Dynamic Beam Coverage for LEO Beam Hopping Systems

IEEE Wireless Communications Letters
Due to the time-varying and non-uniform terrestrial traffic requirements, efficiently utilizing limited satellite resources to match non-uniform traffic demands brings challenges for Low Earth Orbit (LEO) beam-hopping (BH) technology.
Xiaoyan Zhao, Cheng Wang, Songsong Cai, Ruoqi Chen, Jiarui Wen, Lexi Xu, Wei-Dong Wang   +6 more
semanticscholar   +1 more source