Method and circuit for reducing the crest factor

Details Method and circuit for reducing the crest factor Method and circuit for reducing the crest factor

2004-06-01

2010-11-09

Sheikh, Ayaz R (Department: 2476)

Multiplex communications

Generalized orthogonal or special mathematical techniques

Fourier transform

C370S203000

Reexamination Certificate

active

07830783

ABSTRACT:
The invention relates to a method for reducing the crest factor, comprising the following method steps:(a) IFFT transformation of a data symbol to be transmitted;(b) looking for all peak values within a frame of the IFFT-transformed data symbol the amount of which is above a predetermined threshold;(c) providing a sample correction function;(d) allocating a scaling and phase rotation to the sample correction function according to the amplitude and position of the peak values found;(e) generating a correction signal in the frequency domain from a linear combination of rotated and scaled vectors according to the scaling and position determined;(f) modifying, particularly reducing the peak value of the data symbol to be transmitted by subtracting the correction signal, andIFFT transformation of the peak-value-modified data symbol into the time domain.The invention also relates to a circuit for reducing the crest factor.

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Henkel et al. (Par reduction revisited: an extension to Tellado's method; 6th, International OFDM Workshop; 2001; pp. 31-1-to 31-6) International OFDM Workshop Year 2001.

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