Method for reducing PAPR of OFDM signal and OFDM transmitter using the same background
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United States of America Patent
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Jun 27, 2017
Grant Date -
Jan 5, 2017
app pub date -
Oct 7, 2015
filing date -
Jul 3, 2015
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Abstract
A method for reducing a PAPR of an OFDM signal and an OFDM transmitter using the same are disclosed. In an OFDM transmitter, a signal processing circuit for reducing a PAPR of a modulated signal includes: a peak detector configured to detect peaks having sizes above a threshold value from an IQ baseband signal of the modulated signal and to output information on a position, a size and a phase; a memory configured to store a reference peak in time domain; a peak generator configured to generate an inverse peak signal for canceling a part of an amplitude of the IQ baseband signal from the reference peak based on the information on the position, the size and the phase; and a signal processing unit configured to add the inverse peak signal to the IQ baseband signal to constrain the amplitude of the IQ baseband signal.
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