This Book presents a study on PAPR reduction techniques in Orthogonal Frequency Division Multiplexing (OFDM). Nowadays OFDM has emerged as one of the front bearers of high data rate in present as well as evolving wireless technologies such as 3G, 4G, LTE, LTE+, IEEE 802.11 (WLANs), Wi-Fi, Wi-Max etc. This work gives a comprehensive reference to present scenario in research areas of current communication environment.