Patent ID: 8619903
Filing Date: 2013-12-31
Classification: H04L

Abstract:
1. A method for crest factor reduction of a multi-carrier signal comprising a plurality of single-carrier signals, each single-carrier signal of the plurality of single-carrier signals having signal-specific spectral properties, the method comprising: identifying a peak in the multi-carrier signal and a time of occurrence of the peak; generating a plurality of cancellation pulses depending on the time of occurrence of the peak, wherein a particular cancellation pulse of the plurality of cancellation pulses is associated with a particular single-carrier signal of the plurality of single-carrier signals and wherein cancellation pulse-specific spectral properties of the particular cancellation pulse substantially match the signal-specific spectral properties of the associated particular single-carrier signal; combining the plurality of cancellation pulses to form a combined cancellation pulse; applying the combined cancellation pulse to the multi-carrier signal to reduce the peak; weighting the plurality of cancellation pulses with a plurality of weighting factors prior to combining the plurality of cancellation pulses; and adjusting the weighting factors depending on a plurality of variable distortion thresholds for the plurality of single-carrier signals, each variable distortion threshold of the plurality of variable distortion thresholds defining an allowable range of operation for one of the plurality of single-carrier signals with respect to distortions.