2003•Unpublished venueRequires access

Data communications with VSATs: RA/TDMA vs. SS/CDMA

KyoungKeun Kim

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 (>

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Key concepts: Time division multiple access, Code division multiple access, Computer science, Computer network, Multi-frequency time division multiple access, Channel access method, Channel (broadcasting), Spread spectrum