Pulse or digital communications – Synchronizers – Synchronization failure prevention
Patent
1994-07-15
1997-05-06
Chin, Stephen
Pulse or digital communications
Synchronizers
Synchronization failure prevention
375362, 375364, 375365, 375368, 370509, H04L 700
Patent
active
056278632
ABSTRACT:
A discrete multitone modulation transmission system is described in which frame synchronization is monitored at the receiver by correlating frequency domain complex amplitudes of a synchronizing frame with a stored synchronizing pattern. If the correlation result falls below a threshold, indicating a loss of frame synchronization, a plurality of correlations are performed, in each case using the stored complex amplitudes of the synchronizing frame multiplied by a respective complex value representing a respective complex derotation corresponding to a respective possible time shift of the synchronizing frame. The best correlation result, if it exceeds another threshold, indicates a time shift for restoring frame synchronization, this being possible before the next synchronizing frame is received.
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Aslanis James T.
Chow Jacky S.
Amati Communications Corporation
Chin Stephen
Le Amanda T.
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