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Basic capacity calculation methods and benchmarking for MF‐TDMA and MF‐CDMA communication satellites
Author(s) -
Chang Darren D.,
de Weck Olivier L.
Publication year - 2005
Publication title -
international journal of satellite communications and networking
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.388
H-Index - 39
eISSN - 1542-0981
pISSN - 1542-0973
DOI - 10.1002/sat.812
Subject(s) - computer science , time division multiple access , communications satellite , link budget , bandwidth (computing) , key (lock) , code division multiple access , communications system , benchmarking , satellite , channel capacity , electronic engineering , bit error rate , wireless , real time computing , computer network , telecommunications , aerospace engineering , channel (broadcasting) , computer security , marketing , engineering , business
This paper introduces basic capacity calculation methods for circuit switched, multiple‐beam, low earth orbit (LEO) communication satellites that use MF‐TDMA and MF‐CDMA schemes. Capacity is defined as the number of simultaneous duplex channels that a satellite can support for a given data rate and bit error rate. This paper integrates the bandwidth limit and the power limit on capacity, and derives the equations by which the capacity of a MF‐TDMA or a MF‐CDMA system can be calculated using key system parameters. Therefore, these methods enable system designers to quickly estimate the communication system capacity when key system parameters are known. The paper uses the Iridium and Globalstar systems for benchmarking by comparing the results obtained from the analytical methods with the 1100 and 2500 simultaneous channels reported by Iridium and Globalstar, respectively. The analytic capacity estimate matches reported single satellite capacities to within 6%, but the predictions are sensitive to various loss assumptions made in the link budget. Copyright © 2005 John Wiley & Sons, Ltd.