Decoupled Phase Optimization for Partial Transmit Sequence OFDM

Partial transmit sequence (PTS) is a proven technique for peak-to-average-power ratio (PAPR) reduction in orthogonal frequency division multiplexing (OFDM) systems. Determining the optimal phase factors requires an exhaustive search over all possible sets of phase factors. Hence, simplified optimal and suboptimal approaches have been proposed. Previous methods of formulating the phase factor optimization have considered variables over the entire OFDM symbol. With no degradation in performance, we show that fractional PTS sub-blocking can reduce the number of variables in the optimization problem. It can easily be employed with other techniques to significantly reduce complexity.