A PAPR reduction technique based on Golay sequences and Fractional Fourier Transform for OFDM systems

High peak-to-average power ratio (PAPR) is the major drawback for multicarrier transmission. In this paper, we propose reliable PAPR reducing method that consists in putting together a low complexity Golay coder followed by special Fractional Fourier Transform (FRFT) block. The input data encoder which provides low order Golay sequences coded modulation is then transmitted through FRFT block. FRFT angles are designed to provide optimal decorrelation between signal and noise. This new method offers competitive performance as well as low complexity compared to previously published methods. Computer simulation for standard WLAN in IEEE 802.11a system shows 30% PAPR improvement and also 25% Bit Error Rate (BER) enhancement by comparison to the competitive methods.