The combined scheme of selective mapping and clipping for PAPR reduction of OFDM

摘要

Orthogonal Frequency Division Multiplexing is used for recent wireless systems. It is highly spectral efficient and it also performs well in multipath fading environment. However, OFDM signals exhibit high PAPR which needs to be reduced for improved performance of OFDM. This paper combines Selective Mapping and Clipping methods for better PAPR reduction of OFDM signal. Selective Mapping is PAPR reduction techniques to provide good performance without exhibiting any signal distortion. Selective Mapping method is employed and then clipping is performed to achieve further reduction in PAPR. Clipping is performed due to its own advantages such as less complex circuitry and simple computations. Simulation results of combined scheme of Selective Mapping and Clipping show that it can achieve significant PAPR reduction compared to individual methods.