Patent ID: 7720175

Claim:
An apparatus for reducing Peak-to-Average Power Ratio (PAPR) in a communication system, comprising: a magnitude/phase extractor for extracting magnitude and phase components from transmission sample data; a maximum peak detector for detecting a highest peak by determining the magnitude component of each sample, received from the magnitude/phase extractor; a peak windower for updating the highest peak, if the highest peak is greater than a threshold, and feeding back the updated highest peak to the maximum peak detector; and a complex signal combiner for generating, if the highest peak is less than or equal to the threshold, a complex signal by combining magnitude components received from the peak windower with the phase components received from the magnitude/phase extractor, wherein the complex signal combiner generates the complex signal by the following equation: y ( l )= absx r ( l+ ( w — len −1)/2)exp( j·angx ( l )), l= 0,1 ,len− 1 where y(l) represents the complex signal value, r represents the number of iterations of peak windowing, absx r (l) represents the magnitude component of an l th sample in the r th peak windowing, w_len represents the window size, angx(l) represents the phase component of the l th sample, and len represents an Inverse Fast Fourier Transform (IFFT) size.