Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1992-01-31
1994-07-19
Chin, Stephen
Pulse or digital communications
Spread spectrum
Direct sequence
3701101, 3701051, H04L 704
Patent
active
053316703
ABSTRACT:
A synchronization scheme for a digital communications system wherein customer data is connected to a synchronous communications network utilizes auxiliary symbols to provide frame synchronization. Each such auxiliary symbol lies outside of a conventional symbol constellation and is only used to represent framing information. Variations of the customer data rate relative to an expected rate are compensated for by the use of stuff and delete bits in each frame. These bits can be either customer data bits or ancillary bits depending on the direction of this variation. Advantageously, the auxiliary symbols also provide a determination of whether the stuff and delete bits in any frame are customer data or ancillary bits.
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patent: 4651320 (1987-03-01), Thapar
patent: 4891806 (1990-01-01), Farias et al.
patent: 5151920 (1992-09-01), Haagh et al.
patent: 5170413 (1992-12-01), Hess et al.
U.S. Patent Application Serial No. 07/620868, Jean-Jacques Werner, "Digital Communications Synchronization Scheme," filed Nov. 30, 1990, allowed Feb. 18, 1992.
Sorbara Massimo
Werner Jean-Jacques
AT&T Bell Laboratories
Chin Stephen
Padnes David R.
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