Results 281 to 290 of about 13,582,991 (332)
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Constellation Design Using Walker Patterns
AIAA/AAS Astrodynamics Specialist Conference and Exhibit, 2002The recently inaugurated Globalstar and Sirius constellations use Walker patterns and other constellations such as GPS have also made use of this concept. This paper discusses rules to assist in the rapid selection of Walker patterns for new candidate constellations to provide earth coverage.
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Sparse Satellite Constellation Design for LoRa-based Direct-to-Satellite Internet of Things
Global Communications Conference, 2020A global Internet of Things is possible by embracing constellations of satellites acting as orbiting gateways in a Direct-to-Satellite IoT (DtS-IoT).
J. Fraire +4 more
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Ultra-Dense LEO Satellite Constellation Design for Global Coverage in Terrestrial-Satellite Networks
Global Communications Conference, 2020Recently, the ultra-dense low earth orbit (LEO)satellite communication networks over high-frequency band have served as a potential solution for high-capacity backhaul data services.
Ruoqi Deng +3 more
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Capacity-Oriented Satellite Constellation Design in Disaster Emergency Communication Network
International Conference on Wireless Communications and Signal Processing, 2020The satellite constellation design for Disaster Emergency Communication Network (DECN) can strengthen the coverage of incomplete terrestrial network in disaster-stricken area.
Cuiqin Dai, Ting-Yi Yu, Qianbin Chen
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Satellite Network Constellation Design
2014Satellite constellation design plays an important role in satellite network robust QoS routing technology. Although robust QoS routing technology should not depend on constellation design, constellation design can affect the system cost, the effective communications of the entire network, and the effective and convenient management of the satellite ...
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Design of Flower Constellations for Telecommunication Services
Proceedings of the IEEE, 2011Satellite constellation designers take into consideration the entire telecommunication network and their design choices are influenced by many factors including: number of satellites, orbital characteristics, coverage area, network interconnections, system cost, and complexity.
Mortari, D +2 more
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Block-Based Spatial Modulation: Constellation Design and Low-Complexity Detection
IEEE Transactions on Communications, 2020Spatial modulation (SM) uses antenna indices to transmit information, along with modulation symbols. The conventional SM scheme fixes the number of active antennas, and consequently the number of transmit symbols, in a transmit vector to avoid detection ...
Shyam Gadhai, Rohit Budhiraja
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Autonomous interplanetary constellation design
2012According to NASA?s integrated space technology roadmaps, space-based infrastructures are envisioned as necessary ingredients to a sustained effort in continuing space exploration. Whether it be for extra-terrestrial habitats, roving/cargo vehicles, or space tourism, autonomous space networks will provide a vital communications lifeline for both future
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Comparative Study of Basic Constellation Models for Regional Satellite Constellation Design
2016 Sixth International Conference on Instrumentation & Measurement, Computer, Communication and Control (IMCCC), 2016For the regional coverage satellite constellation design optimization under the condition of multi-constrains, an optimization model with the orbital semi-major axis minimization and the percentage of coverage time maximization is built. Basic constellation models such as Walker and Flower are used to reduce the search space dimensions and NSGA-II is ...
Yu Mo, Dawei Yan, Peng You, Shaowei Yong
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Superposed 32QAM Constellation Design for 2 × 2 Spatial Multiplexing MIMO VLC Systems
Journal of Lightwave Technology, 2020Spatial multiplexing multiple-input multiple-output (MIMO) visible light communication (VLC) has become a potential candidate for next-generation wireless communication networks.
Xinyue Guo, N. Chi
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