Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1991-10-04
1993-05-04
Chin, Stephen
Pulse or digital communications
Spread spectrum
Direct sequence
3701051, H04L 700
Patent
active
052088405
ABSTRACT:
In order to detect a plurality of framing bit sequences for establishing synchronization at a receiver in a digital communications system, first and second counters are rapidly reset in order to establish the synchronization as early as possible. A comparator receives a bit stream transmitted and a desired bit sequence for use in detecting the framing bit, and compares the desired bit sequence with part of the bit stream and issues a coincidence signal in the event that the desired bit sequence coincides with the part of the bit stream. The first counter is coupled to receive the coincidence signal, and allows an output indicating the establishment of the synchronization to issue in the event that it reaches a predetermined number of correct coincidence signals. The second counter counts up the number of occurrences of the output of a clock counter, and resets itself and the first counter when reaching a predetermine number of occurrences of a pseudo-coincidence signal.
REFERENCES:
patent: 4790013 (1988-12-01), Kage
patent: 4984238 (1991-01-01), Watanabe et al.
patent: 5109393 (1992-04-01), Saegusa
patent: 5113417 (1992-05-01), McNesby
Chin Stephen
NEC Corporation
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