  The partial transmit sequence (PTS) technique has received much attention in
reducing the high peak to average power ratio (PAPR) of orthogonal frequency
division multiplexing (OFDM) signals. However, the PTS technique requires an
exhaustive search of all combinations of the allowed phase factors, and the
search complexity increases exponentially with the number of sub-blocks. In
this paper, a novel method based on parametric minimum cross entropy (PMCE) is
proposed to search the optimal combination of phase factors. The PMCE algorithm
not only reduces the PAPR significantly, but also decreases the computational
complexity. The simulation results show that it achieves more or less the same
PAPR reduction as that of exhaustive search.
