Method and apparatus for reducing a peak-to-average power ratio in an orthogonal frequency division multiplex signal
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United States of America Patent
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Aug 2, 2005
Grant Date -
May 6, 2004
app pub date -
Oct 31, 2002
filing date -
Oct 31, 2002
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Abstract
An apparatus and method therein for reducing a PAPR in an OFDM signal includes: a reorderer (104) that reorders (706) a plurality of elements of an original frequency-domain input vector in a predetermined manner to create a plurality of candidate input vectors; a Fourier processor (108) that performs (708) an inverse Fourier transform on the candidate input vectors to obtain a corresponding plurality of approximating OFDM outputs; a comparator (114) that compares (710) samples of each of the approximating OFDM outputs with corresponding samples of a target output signal; and an output selector (110) that chooses (712) a desired output signal from the approximating OFDM outputs, in response to a comparison of the samples.
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