Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Patent
1985-06-13
1989-01-10
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
370105, 375 95, 375113, H04B 7185
Patent
active
047976780
ABSTRACT:
One of patterns representative of instants along each TDMA frame is selected as a selected pattern in response to a unique word detection pulse produced in a current frame. With the unique word detection pulse used as a write pulse, a memory memorizes the selected pattern as a memorized pattern in a memory cell accessed by one of burst identifying flags which identify time slots in the current frame, respectively. The memorized pattern is produced as a read-out pattern when accessed by the burst identifying flag which corresponds in a next succeeding frame to the above-mentioned one burst identifying flag. A calculator produces offset representing patterns. Upon coincidence of each read-out pattern and one of the offset representing patterns, a comparator produces a receive position predicting pulse predictive of a position or a unique word detection window in the next succeeding frame. The write pulse is preferably obtained by giving the unique word detection pulse a delay which is equal to a predetermined fraction of each time slot. The offset representing patterns represent the respective instants plus an offset which is equal to a duration of each frame minus a half of a duration of each unique word detection window.
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Takai Haruki
Tsuji Akira
Blum Theodore M.
NEC Corporation
Sotomayor John B.
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