PAPR reduction techniques in OFDM for Wireless Communication systems- A Study

Orthogonal Frequency Division Multiplexing (OFDM) is a multicarrier modulation technique which divides the available spectrum into subcarriers, with each subcarrier containing a low rate data stream. The subcarriers have proper spacing and passband filter shape to satisfy orthogonality. A main issues of OFDM is high Peak-to-Average Power Ratio (PAPR) of the transmitted signal that affects the complexity of power amplifiers. A number of techniques have been proposed and to reduce PAPR of OFDM signal. Some effective methods for mu PAPR reduction are discussed in this paper. Many protocols including Wi-Fi (Wireless fidelity), LTE (Long Term Evolution) , 4G and 5G uses OFDM (Orthogonal Frequency Division Multiplexing). Excellent spectrum efficiency and large transmission data rates are made possible by it. But OFDM's high peakto average power ratio (PAPR) is one of its primary drawbacks. A few strategies for lowering the OFDM signal's PAPR is discussed in this study.