PAPR reduction for pilot-aided OFDM systems with the parametric minimum cross-entropy method

This letter considers the selection of the optimal pilot symbol to decrease the peak-to-average power ratio (PAPR) in pilot-aided orthogonal frequency division multiplexing systems. The conventional pilot-aided PAPR reduction technique necessitates an exhaustive search of all combinations of possible pilot symbol configurations, resulting in high computational complexity. To reduce computational complexity while maintaining PAPR reduction performance, we propose the parametric minimum cross-entropy (PMCE) method for determining near-optimal pilot symbols. Simulation results show that performance of the PMCE-based PAPR reduction is very close to that obtained using the exhaustive search algorithm, with low computational complexity. Compared with the standard cross-entropy method, PMCE has the advantages of better PAPR reduction performance at the same computational complexity.