Unique Words for Identification and Synchronization in TDMA Satellite Communications Systems.

摘要

In a time-division multiple-access (TDMA) system,many transmitting stations time share the same RF spectrum. Individual transmissions must be identifiable to distant receiving stations and must be synchronized so that no interference overlap occurs. A unique word sequence can serve both purposes. The basic concepts of a satellite communications TDMA system are briefly reviewed,with emphasis on functional receiver requirements. A correlation detection scheme is hypothesized,from which false and miss-detection probability expressions are derived. Criteria are then established for the selection of sequences suitable for use as unique words. Representative unique words of length 15through 20are included,along with an explanation of the difficulties encountered in devising an efficient computer search routine. (Author)