APPARATUS AND METHOD FOR REDUCING PAPR(PEAK-TO-AVERAGE POWER RATIO) IN OFDM COMMUNICATION SYSTEM

摘要

PURPOSE: An apparatus and a method for reducing a PAPR(Peak-to-Average Power Ratio) in an OFDM communication system are provided to reduce the PAPR by controlling a phase of a bottom block. CONSTITUTION: An apparatus for reducing a PAPR in an OFDM communication system includes a PAPR comparator, a bottom block divider, a peak value optimization unit, a plurality of multipliers, and an additional information insertion unit. The PAPR comparator(107) is used for generating a control signal to control a phase when a PAPR is larger than a threshold value. The bottom block divider(102) is used for dividing parallel data into bottom blocks. The peak value optimization unit(103) is used for outputting control elements corresponding to the bottom blocks and additional data corresponding to the control elements according to the control signal. The multipliers(111-114) are used for performing the phase transition for the bottom blocks by multiplying the bottom blocks by the control elements. The additional information insertion unit(104) provides the additional data to an IFFT(Inverse Fast Fourier Transform).