Crest factor reduction for a multicarrier-signal with spectrally shaped single-carrier cancelation pulses

A crest factor reduction circuit for 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 crest factor reduction circuit comprising:

• a peak detector for identifying a peak in the multi-carrier signal and a time of occurrence of the peak;
• a multi-pulse generator for generating a plurality of cancellation pulses depending on the time of occurrence, the multi-pulse generator comprising a plurality of pulse generators and a cancellation pulse combiner connected to a pulse output of the plurality of pulse generators and adapted to form a combined cancellation pulse, wherein a particular pulse generator of the plurality of pulse generators is associated with a particular single-carrier signal of the plurality of single-carrier signals and wherein cancellation pulse-specific spectral properties of a cancellation pulse generated by the particular pulse generator substantially match the signal-specific spectral properties of the associated particular single-carrier signal;
• a pulse injector for injecting the combined cancellation pulse to the multi-carrier signal;
• a weighting unit interposed between the plurality of pulse generators and the cancellation pulse combiner, the weighting unit being adapted to weight the plurality of cancellation pulses with a plurality of weighing factors prior to the combining the plurality of cancellation pulses;
• and
• an adaptive adjuster adapted to adjust the weighting factors depending on a plurality of variable distortion thresholds for the plurality of single-carrier signals.

A computer program product comprising a non-transitory computer-usable medium having control logic stored therein for causing processor to execute 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;
• and
• 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.

A computer program product comprising a non-transitory computer-usable medium having control logic stored therein for causing a computer to manufacture a crest factor reduction circuit comprising:

• a peak detector for identifying a peak in the multi-carrier signal and a time of occurrence of the peak;
• a multi-pulse generator for generating a plurality of cancellation pulses depending on the time of occurrence, the multi-pulse generator comprising a plurality of pulse generators and a cancellation pulse combiner connected to a pulse output of the plurality of pulse generators and adapted to form a combined cancellation pulse, wherein a particular pulse generator of the plurality of pulse generators is associated with a particular single-carrier signal of the plurality of single-carrier signals and wherein cancellation pulse-specific spectral properties of a cancellation pulse generated by the particular pulse generator substantially match the signal-specific spectral properties of the associated particular single-carrier signal;
• a pulse injector for injecting the combined cancellation pulse to the multi-carrier signal;
• a weighting unit interposed between the plurality of pulse generators and the cancellation pulse combiner, the weighting unit being adapted to weight the plurality of cancellation pulses with a plurality of weighing factors prior to the combining the plurality of cancellation pulses;
• and
• an adaptive adjuster adapted to adjust the weighting factors depending on a plurality of variable distortion thresholds for the plurality of single-carrier signals.