Performance analysis of PAPR reduction in OFDM system with distortion and distortion less methods

Abstract

OFDM is one of the multicarrier modulation technique, which is promising technology in next generation wireless communication systems. In which the effect of (ISI) inter symbol interference is minimum. One of the major problem in Orthogonal Frequency Division Multiplexing (OFDM) System is high Peak -to-Average Power Ratio (PAPR). So the system requires high power amplifier with large dynamic range. It is very difficult to design such an amplifier with high efficiency. Many researchers working on PAPR reduction techniques, they proposed different methods; one of the simplest method is Clipping, Clipping and filtering. Other methods are Partial Transmit Sequence (PTS), Selective Mapping (SLM), Tone reservation (TR) etc. These are distortion less methods. In this paper we analyzed the PAPR reduction performance of OFDM system using both distortion and distortion less methods i.e.(i) Clipping (ii) Clipping and Filtering with different clipping Ratios (CR's) and(iii) PTS method with different number of sub locks. From simulation results clipping method shows good PAPR reduction with significant amount of BER degradation. Clipping and filtering method shows slight increase in PAPR with small degradation in BER performance than Clipping method and both methods are computationally less complex. PTS provides good PAPR reduction with high computational complexity.