Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1989-10-30
1991-06-18
Safourek, Benedict V.
Pulse or digital communications
Spread spectrum
Direct sequence
3701051, 371 471, 36471511, H04L 702, H04J 306
Patent
active
050254588
ABSTRACT:
An apparatus for decoding frames from a data link including a multiple entry expect/mask buffer an input for receiving multiple character frames, a comparator for comparing characters received from the data link with expected characters in the expect/mask buffer as masked by a mask also in the expect/mask buffer, a multiple entry header buffer for storing characters of frames received by the input, and a multiple entry compare buffer for storing in an entry the results of the comparison of the characters stored in the corresponding entry in the header buffer to expected characters as masked by the mask in a corresponding entry of the expect/mask buffer. Storage into the header buffer and the compare buffer is stopped by terminating events which are detected by a state machine. A data frame recognition circuit is provided which detects a variety of data frames from among the frames transmitted over the data link to the input of the apparatus.
REFERENCES:
patent: 4203003 (1980-05-01), Kline
patent: 4611336 (1986-09-01), Fryer
patent: 4651319 (1987-03-01), Bowlds
patent: 4674088 (1987-06-01), Grover
patent: 4727558 (1988-02-01), Hall
patent: 4779268 (1988-10-01), Wissmann
Casper Daniel F.
Flanagan John R.
Gregg Thomas A.
Huang Catherine C.
Kalos Matthew J.
Bocure Tesfaldet
Gonzalez Floyd A.
International Business Machines - Corporation
Safourek Benedict V.
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