Title :
Data communications with VSATs: RA/TDMA vs. SS/CDMA
Author_Institution :
Contel ASC, Rockville, MD, USA
Abstract :
Random-access time-division multiple-access (RA/TDMA) and spread-spectrum code-division multiple-access (SS/CDMA), two of the most predominant hub-VSAT (very small aperture terminal) inbound access techniques today, are discussed in relation to the interactive data application environment where the response time is the most critical performance parameter. The system access techniques, access time, channel capacity, and performance comparison are presented. It is concluded that, in general, either RA/TDMA or SS/CDMA can provide cost/performance-effective service for interactive applications as compared with terrestrial service alternatives. If the user´s data application consists mostly of short message transactions and its inbound aggregated data rate is low (⩽9.6 kb/s), the SS/CDMA system is recommended. The RA/TDMA system is better suited for the user applications which require a mix of interactive and batch processings
Keywords :
channel capacity; code division multiple access; data communication systems; satellite ground stations; spread spectrum communication; time division multiple access; VSATs; access time; channel capacity; data communications; inbound access techniques; interactive data application environment; performance comparison; random access time division multiple access; response time; spread-spectrum code-division multiple-access; Artificial satellites; Costs; Data communication; Multiaccess communication; Propagation delay; Protocols; Spread spectrum communication; Throughput; Time division multiple access; Time division multiplexing;
Conference_Titel :
Electronics and Aerospace Conference, 1988. How will Space and Terrestrial Systems Share the Future? Conference Proceedings, IEEE EASCON '88, 21st Annual
Conference_Location :
Arlington, VA
DOI :
10.1109/EASCON.1988.11248
