Performance Analysis of Precoded PTS and SLM Scheme for PAPR Reduction in OFDM System

Orthogonal Frequency Division Multiplexing (OFDM) is a multicarrier system which provides high data rate services in wireless communication systems. The major drawback of OFDM is high Peak-to-Average Power Ratio (PAPR). An OFDM with high PAPR requires High Power Amplifiers (HPA) which are very difficult to design and manufacturing becomes complex and costlier. Many PAPR reduction techniques have been proposed out of which the existing technique is Partial Transmit Sequences (PTS) and Selected Mapping (SLM) with optimum PAPR reduction and less complexity. In this paper the analysis of OFDM system, PTS OFDM system and SLM OFDM systemwith various precoding methods like Discrete Fourier Transform (DFT) Precoder, Discrete Hartley Transform (DHT) Precoder and Walsh-Hadamard Transform (WHT) Precoder techniques are analyzed for PTS, SLM for M-QAM is analyzed for better PAPR reduction.