Method and System for Reducing the Peak-to-Average Power Ratio
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United States of America Patent
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Issued Date -
Sep 9, 2010
app pub date -
Jun 27, 2008
filing date -
Jun 29, 2007
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Abandoned
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Abstract
This invention provides a method and system for reducing the PAPR. The method involves (i) intentionally inserting error(s) into the time or frequency domain and (ii) employing various bit mapping schemes to provide a significant reduction in the PAPR. An embodiment of the error insertion of the method involves intentionally inserting symbol error(s) into the quadrature amplitude modulation (QAM) symbol stream before applying discrete Fourier transform in OFDM. The method trades off the coding gain of the system for the PAPR reduction of the OFDM signals and does not require transmission of side information. It further has reduced complexity and improved bit error rate (BER) performance when used with a typical non-linear amplifier as compared to alternative existing methods (Gray coding, tone injection, tone reservation, etc.)
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