Patent ID: 8300714

Claim:
A method for reducing a Peak to Average Power Ratio (PAPR) using a reserved tone set in a transmission apparatus of an Orthogonal Frequency Division Multiplexing (OFDM) communication system, the method comprising: determining a shift value based on a subcarrier spacing interval (x) and a number of spaced symbols (y) of a scattered pilot pattern; determining the reserved tone set (S i ) for OFDM symbols by shifting each of subcarriers (i k ) of a predetermined reserved tone set (S 0 ) by the determined shift value; determining an impulse waveform obtained by rotating a phase of a complex value of an impulse stored in a memory, using the reserved tone set; calculating a subtrahend for a PAPR of an output signal using the phase-rotated impulse waveform; and reducing a PAPR of an input signal by performing a gradient algorithm using the phase-rotated impulse waveform.