I. Introduction
Orthogonal frequency division multiplexing (OFDM) technique has been widely deployed in high-speed data transmission systems, primarily for its good resistance to multipath fading and high spectral efficiency. However, the inherent high peak-to-average power ratio (PAPR) problem is still one main defect. Various PAPR reduction schemes have been proposed [1]–[4]. Nevertheless, reducing complexity has always been a tricky task.