Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Reexamination Certificate
2007-11-06
2007-11-06
Vo, Don N. (Department: 2611)
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
C375S346000
Reexamination Certificate
active
10455513
ABSTRACT:
A multi-stage signal processing method is provided that reduces the Peak to Average Power Ratio (PAPR) of an Orthogonal Frequency Division Multiplexed (OFDM) signal without increasing the bit error rate of the system. The multi-stage processing system apportions the tones into a number of types, and processes the tones in an order and by a process consistent with their determined type. Advantageously, preprocessing of the time domain signal may be used to condition the data tones for optimal PAPR reduction during the multi-stage process.
REFERENCES:
patent: 6366555 (2002-04-01), Gatherer et al.
patent: 6674810 (2004-01-01), Cheng
patent: 7136423 (2006-11-01), Duvaut et al.
patent: 2002/0176510 (2002-11-01), Laroia
patent: 2003/0189893 (2003-10-01), Richardson
Demirekler Levent
Purkovic Aleksandar
McGuinness & Manaras LLP
Nortel Networks Limited
Vo Don N.
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