Method of determining an end of a transmitted frame in a...

Details Method of determining an end of a transmitted frame in a... Method of determining an end of a transmitted frame in a...

2005-05-10

2005-05-10

Ha, Dac V. (Department: 2634)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S152000, C375S343000, C375S369000, C370S510000, C370S512000

Reexamination Certificate

active

06891881

ABSTRACT:
A method of determining an end of a transmitted frame at a receiver on a frame-based communications network. An end of frame format for the transmitted frame is provided having an end of frame plurality of symbols. A received transmitted frame is filtered using filter coefficients matched to the end of frame plurality of symbols to provide a correlation sequence low-pass filtered signal. A squared magnitude of the correlation sequence is computed. The squared magnitude of the correlation sequence is low-pass filtered to provide a low-pass filtered correlation signal. The low-pass filtered correlation signal is delayed to provide a delayed low-pass filtered correlation signal. The delayed low-pass filtered correlation signal is multiplied by a fixed predetermined threshold to provide a multiplied correlation signal. The multiplied correlation signal is compared with the low-pass filtered correlation signal to provide a match
o match comparison indicative of the possible end of a transmitted frame.

REFERENCES:
patent: 5809009 (1998-09-01), Matsuoka et al.
patent: 6301291 (2001-10-01), Rouphael et al.
patent: 6625239 (2003-09-01), Shiraishi et al.
patent: 0 938 207 (1999-08-01), None
patent: WO 9920016 (1999-04-01), None
J. Carlson, et al., “PPP over Simple Data Link (SDL) using SONET/SDH with ATM-like framing,”Internet Draft, Nov. 1998, pp. 1-21.

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