Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1989-06-30
1991-04-23
Safourek, Benedict V.
Pulse or digital communications
Spread spectrum
Direct sequence
375114, 370105, H04J 306
Patent
active
050105590
ABSTRACT:
A synchronizer in a receiver for a serial data stream includes a shift register for temporarily storing the most recently received data. Taps at a plurality of locations on such shift register provide bit signals at regularly spaced locations. These bit signals are checked for the occurrence of predetermined patterns which indicate the occurrence of frame bit candidates. A candidate shift register indicates which bit positions currently remain as candidates for the frame bit position, and is shifted synchronously with the incoming data. The candidate shift register is N bits in length, and a modulo-N counter is connected to the serial output thereof. Each time a bit position shifted out of the candidate register contains a valid candidate, the modulo-N counter is reset. When the counter counts for a full cycle, the true frame bit position has been identified.
REFERENCES:
patent: 3482044 (1969-12-01), Kaneko
patent: 4347606 (1982-08-01), Hoogeveen
patent: 4730346 (1988-03-01), Jiang
patent: 4744081 (1988-05-01), Buckland
patent: 4768192 (1988-08-01), Pattavina et al.
patent: 4930125 (1990-05-01), Bains
Courtright David A.
O'Connor James T.
Hill Kenneth C.
Kim Una
Robinson Richard K.
Safourek Benedict V.
SGS-Thomson Microelectronics Inc.
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