Device of crest factor reduction

摘要

The present disclosure provides a device (300) of crest factor reduction for a multi-carrier signal. The device (300) includes: a peak detector (320) adapted to receive a sampled representation of the multi-carrier signal, detect a peak from the sampled representation and obtain a value and a time domain location of a cancellation peak for cancelling the peak; a plurality of peak cancellation signal generators (330) each corresponding to a carrier of the multi-carrier signal and adapted to generate a peak cancellation signal within a frequency band of its corresponding carrier based on the value and time domain location of the cancellation peak; and a subtractor (350) adapted to subtract the peak cancellation signals from the sampled representation after being delayed. The present disclosure also provides another device of crest factor reduction, a multi-stage crest factor reduction circuit and a peak detector.

主权项

1. A device of crest factor reduction for a multi-carrier signal comprising:
a peak detector adapted to receive a sampled representation of the multi-carrier signal, detect a peak from the sampled representation and obtain a value and a time domain location of a cancellation peak for cancelling the peak; a plurality of peak cancellation signal generators each corresponding to a carrier of the multi-carrier signal and adapted to generate a peak cancellation signal within a frequency band of its corresponding carrier based on the value and time domain location of the cancellation peak, wherein each of the plurality of peak cancellation signal generators comprises:
an allocator adapted to allocate the cancellation peak to a peak generation unit;a plurality of peak generation units each adapted to, if allocated with the cancellation peak, adjust a phase of the cancellation peak to obtain a phase adjusted value of the cancellation peak and generate an intermediary signal based on the phase adjusted value and the time domain location of the cancellation peak;an adder adapted to sum up intermediary signals generated by the plurality of peak generation units to obtain a sum signal; anda mixer adapted to up-convert the sum signal to the carrier corresponding to the peak cancellation signal generator to generate the peak cancellation signal, wherein the phase of the cancellation peak is adjusted to compensate for a phase offset introduced by the mixer; and a subtractor adapted to subtract the peak cancellation signals from the sampled representation after being delayed.