Journal ArticleDOI
The Globalstar cellular satellite system
F.J. Dietrich,P. Metzen,P. Monte +2 more
TLDR
The Globalstar cellular-telephone satellite system is described, including its use of code-division multiple access (CDMA) as the basic modulation scheme.Abstract:
The Globalstar cellular-telephone satellite system is described, including its use of code-division multiple access (CDMA) as the basic modulation scheme. Use of diversity for signal quality as well as power control is described, Development of the complex array antennas for L-band (1.6 GHz) and S-band (2.5 GHz) communication with the hand-held radios is described in detail.read more
Citations
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Journal ArticleDOI
Space-Air-Ground Integrated Network: A Survey
TL;DR: This paper is the first to present the state-of-the-art of the SAGIN since existing survey papers focused on either only one single network segment in space or air, or the integration of space-ground, neglecting the Integration of all the three network segments.
Journal ArticleDOI
High-speed satellite mobile communications: technologies and challenges
Mohamed Ibnkahla,Quazi Mehbubar Rahman,Ahmed Iyanda Sulyman,Hisham Alasady,Jun Yuan,A. Safwat +5 more
TL;DR: An overview of future high-speed satellite mobile communication systems, the technologies deployed or planned for deployment, and the challenges is presented, focusing in particular on nonlinear downlink channel behavior, shadowing and multipath fading.
Journal ArticleDOI
Deep Q-Learning Aided Networking, Caching, and Computing Resources Allocation in Software-Defined Satellite-Terrestrial Networks
TL;DR: This paper proposes a software-defined STN to manage and orchestrate networking, caching, and computing resources jointly, and forms the joint resources allocation problem as a joint optimization problem, and uses a deep Q-learning approach to solve it.
Patent
Method and apparatus for generating and distributing satellite tracking information
TL;DR: In this article, a method and apparatus for generating and distributing satellite tracking data to a remote receiver is disclosed, which includes extracting from satellite-tracking data initial model parameters representing a current orbit of at least one satellite-positioning-system satellite, computing an orbit model using the initialmodel parameters, wherein a duration of the orbit model is longer than a length of the satellite tracking dataset, and adjusting the adjusted orbit model to match the tracking data for an overlapping period of time.
Patent
Method and apparatus for assisted GPS
TL;DR: In this article, an Integrity Monitor (IM) informs mobile stations, their users, or networks of measurement quality and it warns them of failing and failed GPS satellites by isolating them from the effects of these failures.
References
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Patent
Active transmit phased array antenna.
TL;DR: In this paper, an active transmit phased array antenna system for generating multiple independent simultaneous antenna beams to illuminate desired regions while not illuminating other regions is proposed. But the antenna array is not designed to be used for any specific application.
Patent
Antenna feed and beamforming network
TL;DR: In this paper, a small, inexpensive lightweight, easy to assemble multibeam or phased array device which may be used as a feed for a reflector or lens antenna is presented.
Proceedings ArticleDOI
The Globalstar air interface - Modulation and access
Paul Monte,Steve Carter +1 more