Patent ID: 7496028

Claim:
A transmission apparatus for minimizing a peak-to-average power ratio (PAPR) in an orthogonal frequency division multiplexing (OFDM) communication system, comprising: a subband divider for dividing information data subcarrier signals into subband signals; an additional information inserter for inserting into the information data subcarrier signals additional information subcarrier signals including a sign bit indicating whether a dummy sequence is inserted and an address bit indicating a position of a subband into which the dummy sequence is to be inserted; a dummy sequence inserter for inserting the dummy sequence into a subband corresponding to the position among the subband signals; an inverse fast Fourier transform (IFFT) block for generating a first OFDM symbol signal by IFFT-transforming the additional information subcarrier signals and dummy sequence-free subband signals, and generating a second OFDM symbol signal by IFFT-transforming the additional information subcarrier signals and dummy sequence-inserted subband signals; a controller for determining a sign bit value and an address bit value of the additional information when a PAPR value of the first OFDM symbol signal exceeds a predetermined PAPR threshold, and controlling the dummy sequence inserter to insert the dummy sequence into a subband in a position corresponding to the address bit value among the subband signals so that the second OFDM symbol signal is transmitted over a downlink; and a transmitter for transmitting at least one of the first and second signals output from the IFFT block over the down link.