Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Reexamination Certificate
2007-10-31
2010-11-09
Lugo, David B (Department: 2611)
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
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.
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Cho Sang-In
Choi Sang-Sung
Kang Kyu-Min
Park Kwang-Roh
Shin Cheol-Ho
Electronics and Telecommunications Research Institute
Lugo David B
Rabin & Berdo P.C.
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