Improved Peak Windowing for PAPR Reduction in OFDM

The large peak to average power ratio (PAPR) in orthogonal frequency division multiplexing (OFDM) transmission translates to system performance degradation due to low power efficiency in the presence of nonlinear power amplification. To reduce PAPR, many OFDM systems have adopted the peak windowing method. However, existing peak windowing schemes suffer from performance limitations especially in the presence of multiple closely-spaced peaks. In this paper, two new peak windowing schemes are proposed to improve performance by taking care of closely-spaced peaks. Simulation results show that the two proposed schemes outperform existing schemes in attaining significantly lower out-of-band radiation given the same in-band distortion constraints.