A Comparison Study of CDMA Versus TDMA/FDMA Leo Satellite Systems.

reportActive / Technical Report | Accession Number: ADA307158 | Open PDF

Abstract:

In this thesis, two LEO satellite systems with different multiple access schemes are analyzed. The first system, GLOBALSTAR, uses CDMA. Equations are developed to calculate the maximum capacity of one satellite, of one satellites user beam, and of the entire GLOBALSTAR system over CONUS. A detailed description of GLOBALSTARs outage probability, the probability that a call will be dropped from the system or blocked from connection with the system, is given and graphed against varying average call time and varying call arrival rate. The second system, IRIDIUM, uses TDMAFDMA. Equations are similarly developed to calculate the maximum capacity of one satellite, of one satellites user beam, and of the entire IRIDIUM system over CONUS. The probability of success or failure of an IRIDIUM subscriber obtaining a system channel is given by the Erlang Loss Formula and graphed against varying average call time and varying call arrival rate. Results show GLOBALSTAR provides five times the service capacity of IRIDIUM over CONUS and provides a better probability of obtaining a system channel for a call than will IRIDIUM.

Author(s):
Ciocco, Timothy M.
Author Organization(s):
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
Descriptive Note:
Master's thesis,
Pagination:
0066

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Monitor Series:
NPS
 Subject Terms
Joint Capability Areas:
JCA_6.1.3_Switching and Routing; JCA_6_Net Centric; JCA_6.1.2_Wireless Transmission; JCA_6.1_Information Transport; JCA_6.4.1_Secure Information Exchange; JCA_6.3.3_Spectrum Management; JCA_6.4_Information Assurance; JCA_6.3.4_Cyber Management; JCA_6.3_Net Management; JCA_4.6_Engineering; JCA_5.3_Planning; JCA_5_Command and Control; JCA_1_Force Support; JCA_1.2.5_Lessons Learned; JCA_1.2_Force Preparation; JCA_8_Building Partnerships
Communities of Interest:
No COI(s) Identified
Descriptor(s):
*COMMUNICATIONS TRAFFIC, *COMMUNICATION SATELLITES, *MULTIPLE ACCESS, CAPACITY(QUANTITY), COMPARISON, THESES, USER NEEDS, RADIO LINKS, CHANNELS, FREQUENCY DIVISION MULTIPLE ACCESS
Field(s)/Group(s):
Radio Communications
Keyword(s):
*CODE DIVISION MULTIPLE ACCESS, LEO SATELLITES, IRIDIUM SATELLITE, GLOBESTAR SATELLITE, TIME DIVISION MULTIPLE ACCESS
Report Date:
1996 Mar 01