Patent ID: 8457249
Filing Date: 2013-06-04
Classification: H04L

Abstract:
1. A method for reducing a Peak-to-Average Power Ratio, PAPR, of a transmitted signal in a wireless telecommunication system utilizing Crest Factor Reduction, CFR, technique, the method comprising: receiving at each clipping stage in a plurality of cascaded clipping stages at least one complex sample associated with that clipping stage and based on the transmitted signal; computing at each clipping stage a Look Up Table (LUT) input based on a difference between a squared absolute value of said at least one complex sample and a squared maximum allowable amplitude individually configured for that clipping stage; providing at each clipping stage the LUT input computed for that clipping stage to a LUT in that clipping stage; filtering the output of said LUT to suppress out-of-band emissions after at least one of said clipping stages; and receiving a clipped signal based on an output of the LUT associated with a last clipping stage in said plurality of cascaded clipping stages.