Method of detecting the frequency deviation in digital communica

Details Method of detecting the frequency deviation in digital communica Method of detecting the frequency deviation in digital communica

1992-07-07

1994-04-19

Gregory, Bernarr E.

Pulse or digital communications

Repeaters

Testing

380 34, 380 49, 375102, 455 671, 455 673, 455 674, H04L 2730, H04B 1700

Patent

active

053053478

ABSTRACT:
The invention discloses a method of measuring the rough frequency deviation in digital communication transmissions with echo propagation, particularly in the short-wave domain. A repeatedly transmitted PN sequence serves as the preamble of a data block. This PN sequence is compressed at the receiving end in matched filters provided in each one of a plurality of simultaneous, frequency offset Doppler channels. The Doppler channel having the greatest amplitude in the quadrature signal is selected for a determination of the rough frequency deviation. To detect a pattern in the preamble, the quadrature signals are examined for similarities by an amplitude comparison or in a cross-correlation process.

REFERENCES:
patent: 3694757 (1972-09-01), Hanna, Jr.
patent: 5090023 (1992-02-01), Watanabe et al.

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