Method of determining a start of a transmitted frame in a...

Details Method of determining a start of a transmitted frame in a... Method of determining a start of a transmitted frame in a...

2006-01-31

2006-01-31

Deppe, Betsy L. (Department: 2637)

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

C375S368000

Reexamination Certificate

active

06993101

ABSTRACT:
A method of determining a start of a transmitted frame at a receiver on a frame-based communications network. A received transmitted frame is filtered using filter coefficients matched to a preamble symbol sequence to provide a correlation sequence. The correlation sequence is low-pass filtered and delayed to provide a delayed low-pass filtered correlation signal. The delayed low-pass filtered correlation signal is compared with the low-pass filtered correlation signal and a fixed predetermined threshold to provide a correlation difference indicator. Energy of the received transmitted frame is detected and the energy is low-pass filtered to provide a low-pass filtered energy signal. The low-pass filtered correlation signal is compared with the low-pass filtered energy signal to provide a correlation peak indicator. A logical-AND of the correlation difference indicator and the correlation peak indicator is formed to determine a match
o match comparison indicative of the start of a transmitted frame.

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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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