Time Division Multiple Access (TDMA) Experimentation.
Final technical rept. 11 May-10 Oct 70,
IBM FEDERAL SYSTEMS DIV GAITHERSBURG MD
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The report describes an experimental computer-controlled TDMA control system which has been developed by IBM and tested through TACSAT. The in-band TDMA system is based on a concept in which a reference station generates the TDMA frame marks and disseminates them through the satellite to all participating earth terminals. The system has been designed to operate over varying frame durations 0.1 to 10 milliseconds, burst rates 1.25 through 40 megabits per second Mbs and frames that are divisible into 2, 4, 8 and 16 time slots. The system incorporates an IBM 1131-2B Central Processing Unit CPU and operates automatically through initial time slot acquisition to steady state burst transmission control when the assigned time slot, the number of consecutive time slots, coarse range to the satellite, burst rate, etc., are specified. Closed loop test data in the form of computer printouts obtained through TACSAT link experimentation are incorporated and discussed. The experiment has amply demonstrated the feasibility of this particular method of controlling the TDMA process with a computer. In a more general sense, the advantages gained by performing computer control of digital communication processes has been demonstrated. Author
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- Radio Communications