Telegraphy – Systems – Printing
Patent
1976-12-06
1978-08-15
Griffin, Robert L.
Telegraphy
Systems
Printing
178 691, 179 15BS, H04J 306
Patent
active
041076087
ABSTRACT:
A burst synchronization technique employed in a multiple access TDMA communication system in which all member stations communicate through a common repeater apparatus such as a stationary satellite.
A member station may gain access by transmitting during its allocated time slot. A time frame is defined as having a time duration equal to at least the time for the burst intervals of all the member stations preferably with at least a small guard time between bursts. A super-frame is defined as containing a plurality of frames which are sufficient in number to provide for a measurement period, a correction period and advance notice period and a propagation period.
Synchronization at a station is attained by receiving a reference signal transmitted by one member station and returned from the repeater to all stations; measuring the magnitude and polarity of the difference of the super frame timing reference relative to that of the station; transmitting said difference in advance of correction and then correcting said station timing relative to the reference during a correction phase.
Other member stations receive the different information only during the advance notice phase and correct only during the correction phase of a super frame, even in the absence of receiving a timing pulse for providing synchronization.
Means are provided for facilitating synchronization between receiving and transmitting facilities at each station over a reduced time period.
REFERENCES:
patent: 3562432 (1971-02-01), Gabbard
patent: 3730998 (1973-05-01), Schmidt et al.
patent: 3772475 (1973-11-01), Loffreda
patent: 3778715 (1973-12-01), Schmidt
patent: 3789142 (1974-01-01), Shimasaki
patent: 3813496 (1974-05-01), Maillet
patent: 3922496 (1975-11-01), Gabbard
patent: 3982075 (1976-09-01), Jefferis
patent: 4028497 (1977-06-01), Saburi
Griffin Robert L.
Masinick Michael A.
Nippon Electric Co. Ltd.
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