Apparatus and method for detecting preamble packet in...

Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train

Reexamination Certificate

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C375S267000, C375S343000

Reexamination Certificate

active

07830973

ABSTRACT:
There is provided an apparatus for detecting a preamble packet in an orthogonal frequency-division multiplexing (OFDM) system, including: a cross-correlation calculating means for calculating a cross-correlation value between a received signal and previously stored preamble pattern values for an OFDM symbol region (N-point); a delay means for delaying the calculate cross-correlation value as much as a M-point interval; a receiving power measuring means for measuring a receiving power for the guard interval; and a dividing means for calculating a final cross-correlation value by dividing the delayed cross correlation value by the measured power.

REFERENCES:
patent: 2006/0031740 (2006-02-01), Kidambi et al.
patent: 2006/0114812 (2006-06-01), Kim et al.
patent: 2007/0195914 (2007-08-01), Chang et al.
patent: 2008/0310561 (2008-12-01), Song et al.
patent: 2003-143106 (2003-05-01), None
patent: 10-0191326 (1999-01-01), None
patent: 10-2002-0064575 (2002-08-01), None
patent: 2005-0040090 (2005-05-01), None
patent: 10-0585173 (2006-05-01), None
patent: 2006-0068422 (2006-06-01), None
“Detection and Symbol Timing Design and Implementation of Signal Synchronization for Wireless Modem”, Seung-Ho Lee et al.,2003 Fall Conference on Korea Information and Communication Society, pp. 188, 2003.

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