Distortionless PAPR Reduction Method for Existing OFDM Systems

In this paper, we propose a distortionless PAPR (peak-to-average power ratio) reduction method for applying to existing OFDM systems, for example IEEE 802.11a/g/n wireless LAN or ADSL and so on. The proposed method estimates the PAPR of output OFDM symbol through the emulation of the lower layer operations. If the estimated PAPR is larger than the required value, we continue permutes binary data according to prepared mapping functions until the requirement is satisfied or reach to preset maximum number of iterations. Simulation results based on the parameters of IEEE 802.11a standard show that the proposed method can effectively lower the distributions of PAPR. When nonlinear amplifier is assumed, 2 or 4 times of iterations are enough to suppress the out-of-band emission effectively