Method and apparatus for preamble-less demodulation

Details Method and apparatus for preamble-less demodulation Method and apparatus for preamble-less demodulation

1997-08-29

2000-01-18

Ngo, Ricky

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

375283, 370523, H03D 100, H04L 2710, H04J 312

Patent

active

060163291

ABSTRACT:
A method and apparatus for demodulating includes differential-detecting an input signal into which a unique word is inserted, correlating an output of the differential-detection and a data table obtained by differential-detecting the unique word, detecting a time when an electric power of a correlation output which exceeds a threshold value becomes the local maximum, reading the input signal stored in a buffer from the leading end of the unique word, estimating a frequency error of the input signal based on a phase of the correlation output, obtaining a signal by removing the frequency error from the read signal and inverse-modulating a unique word portion in the signal in which the frequency error has been removed, according to a data of a unique word table, and then reproducing a carrier signal.

REFERENCES:
patent: 4947409 (1990-08-01), Raith et al.
patent: 5093846 (1992-03-01), Walton, Jr. et al.
patent: 5276710 (1994-01-01), Iwasaki et al.
patent: 5333148 (1994-07-01), Tsubaki et al.

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