PAPR reduction using clipping function depending on the peak value and the peak width
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United States of America Patent
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May 12, 2015
Grant Date -
Sep 5, 2013
app pub date -
Aug 12, 2011
filing date -
Sep 10, 2010
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Abstract
For clipping a signal with respect to a clipping threshold (Amax), a signal portion above the clipping threshold and a peak (Pk) in the signal portion are detected, a clipping function depending on end times (ts, te) of the signal portion, the amplitude of the detected peak and the clipping threshold is derived, and the signal portion is clipped by multiplying it by the clipping function. The first portion can be enlarged up to the lowest boundary points (t1+1, t2−1) on the first ascending portion and the last descending portion of the detected peak. Spectral leakage in the sidebands out to the frequency band of the clipped signal is eliminated by a filtering device. The filtered dipped signal to the input of the amplifier has peaks as close to the saturation threshold of a power amplifier as possible.
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