NDLI: Meeting the challenge of applying cellular concepts to LEO SATCOM systems

Content Provider	IEEE Xplore Digital Library
Author	Pullman, M.A. Peterson, K.M. Jan, Y.
Copyright Year	1992
Description	Author affiliation: Motorola Inc., Chandler, AZ, USA (Pullman, M.A.; Peterson, K.M.; Jan, Y.)
Abstract	The authors discuss challenges encountered in satellite-based cellular systems that will employ low Earth orbiting (LEO) constellations to provide continuous worldwide coverage, with some minimum grazing angle. Motorola's Iridium system will utilize spot beams to form cells on the Earth's surface similar to terrestrial cellular radio. However, for LEO constellations, the geometric relationship between cells will no longer be constant, as with terrestrial systems. To execute channel reuse, it will be necessary to maintain sufficient distance between reuse cells to assure that interference levels do not degrade performance. Due to the dynamics of the cell movement, relative to the subscribers, calls must be handed off, from cell-to-cell and/or from space vehicle-to-space vehicle, during a call. Cell hand-off will be transparent to the subscribers at both ends of the call, and can occur several times during a normal call. The Iridium program will operate with a seven-cell frequency reuse pattern. On a global basis, there will typically be 1628 cells on to ensure worldwide coverage, and the seven-cell pattern will reuse each frequency over two hundred times. Within the contiguous US alone, Iridium will achieve more than five times frequency reuse.<>
Starting Page	770
Ending Page	773
File Size	349516
Page Count	4
File Format	PDF
ISBN	078030599X
DOI	10.1109/ICC.1992.268180
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1992-06-14
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Low earth orbit satellites Satellite broadcasting Telephony Cellular networks Interference Space vehicles Satellite communication Land mobile radio cellular systems Power generation economics Artificial satellites
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in