I. Introduction
Orthogonal frequency division multiplexing (OFDM) has been extensively deployed in high speed wireless communications, including broadband internet access systems and digital audio/video broadcasting. It offers the advantages of high spectral efficiency and immunity to multipath fading [1]. However, being a multi-carrier modulation technique, OFDM signal has a highly fluctuating, noise-like envelope. This increases the dynamic range of the signal, due to which it experiences non-linear distortion introduced by the high-power amplifier (HPA) at the transmitter’s front-end. Consequently, bit error rate (BER) and out-of-band interference (OBI) levels are elevated.