Multiplex communications – Communication over free space – Combining or distributing information via time channels
Patent
1997-08-11
1998-06-30
Kizou, Hassan
Multiplex communications
Communication over free space
Combining or distributing information via time channels
370512, 370514, 375368, H04J 306
Patent
active
057744629
ABSTRACT:
In a time division multiplex (TDM) signal in which a symbol is sent one by one periodically, a unique word in the TDM signal is recognized quickly in a receiving station. A receive station has essentially N number of correlators each having a specific unique word pattern. A unique word pattern in each correlator is obtained by shifting by predetermined symbols cyclically from a reference unique word pattern. Each correlator provides a correlation value between a received TDM signal which includes a unique word and a unique word pattern defined in the correlator. Among outputs of N number of correlation values, which exceed a predetermined threshold value, the correlator which provides the maximum correlation value is selected, and the receive timing of the unique word is determined by the correlator thus selected.
REFERENCES:
patent: 4802192 (1989-01-01), Eto et al.
patent: 5014272 (1991-05-01), Yoshida
patent: 5539751 (1996-07-01), Sabel
patent: 5550833 (1996-08-01), Fujisawa
Ishikawa Hiroyasu
Kobayashi Hideo
Kizou Hassan
Kokusai Denshin Denwa Co. Ltd.
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