Patent ID: 8259846

Claim:
An apparatus for generating a multicarrier communication signal having a reduced crest factor, comprising: a plurality of shaping filters for receiving a plurality of unshaped baseband transmission signals and outputting a corresponding plurality of shaped baseband transmission signals; a plurality of mixers, each operatively connected to one of the plurality of shaping filters, for multiplying each signal of the plurality of shaped baseband transmission signals by one of a plurality of complex carrier signals; a window function generator for generating a clipping window signal based on power levels of the plurality of unshaped baseband transmission signals; a peak detector, operatively connected to the plurality of mixers; a plurality of window output units, each operatively connected to both the window function generator and the peak detector, for outputting a plurality of subtraction-based clipping window signals; and at least one summing unit, operatively connected to the plurality of window output units and to the plurality of mixers, for generating, from the plurality of subtraction-based clipping window signals and the plurality of shaped baseband transmission signals, the multicarrier communication signal having the reduced crest factor.