Pulse or digital communications – Spread spectrum – Frequency hopping
Reexamination Certificate
2007-11-20
2007-11-20
Payne, David C. (Department: 2611)
Pulse or digital communications
Spread spectrum
Frequency hopping
C375S260000, C375S355000
Reexamination Certificate
active
10934276
ABSTRACT:
A integrated system for generation of packet detection, symbol timing, and coarse frequency offset for an orthogonal frequency division multiplexed (OFDM) receiver having a stream of input symbols applied comprises a first multiplier performing a multiplication on a delayed and conjugated stream of input symbols multiplied by the input symbol stream. The output of the first multiplier is summed over a symbol length. A second multiplier has an output formed from multiplying the delayed symbol stream by its conjugate, thereby providing a signal strength term Pn. The output of the second multiplier is summed over two symbol periods, and multiplied by a known threshold to form a threshold value. When the magnitude of cn term rises above the known threshold, this generates a packet detect output, and when the magnitude of Cn terms thereafter falls below the known threshold, this generates a symbol timing output.
REFERENCES:
patent: 5732113 (1998-03-01), Schmidl et al.
patent: 5889759 (1999-03-01), McGibney
patent: 6021110 (2000-02-01), McGibney
patent: 6151295 (2000-11-01), Ma et al.
patent: 6320915 (2001-11-01), Stott et al.
patent: 6363084 (2002-03-01), Dejonghe
patent: 6381263 (2002-04-01), Suzuki
patent: 6459679 (2002-10-01), Kim
patent: 6539063 (2003-03-01), Peyla et al.
patent: 6628606 (2003-09-01), Hong et al.
patent: 6658063 (2003-12-01), Mizoguchi et al.
patent: 6675012 (2004-01-01), Gray
patent: 6700866 (2004-03-01), Heinonen et al.
patent: 6754170 (2004-06-01), Ward
patent: 7203245 (2007-04-01), Murphy
Neerudu Ravikumar
Sekhar Ponnamanda Venkata Chandra
Venkatesh Narasimhan
Chesavage Jay A.
Guarino Rahel
Payne David C.
Redpine Signals, Inc.
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