Crest factor reduction system and method for OFDM...

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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C375S296000

Reexamination Certificate

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07742535

ABSTRACT:
A system and method for crest factor reduction of OFDM transmission systems using selective sub-carrier degradation, is disclosed. A modulated communications signal comprising a series of symbols is converted into parallel format in groups of plural symbols in the frequency domain. Crest factor reduction reduces a primary peak of the groups of plural symbols by selective sub-carrier degradation, to generate peak reduction symbols. The groups of plural symbols are converted into time domain symbols, and combined with the peak reduction symbols to provide peak reduced symbols in time domain.

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International Search Report for PCT/US06/048726 mailed Dec. 3, 2007.
Andersen, “Crest Factor Analysis for Complex Signal Processing: Understanding the Complexities of Summing Digital Signals.” RF Design [online] Oct. 2001, pp. 40, 42, 44, 46, 48, 50, 52, 54, 56. (Internet http://rfdesign.com/images/archive/1001Andersen40.pdf).

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