A novel algorithm for PAPR reduction in LTE system

Abstract

High Peak to Average Power Ratio (PAPR) is still one of the most important challenges in Orthogonal Frequency Division Multiplexing (OFDM) system. In this paper, we proposed a hybrid algorithm that is based selected mapping (SLM) technique for PAPR reduction in OFDM system. This algorithm incorporates the transformations into the SLM technique. Rather than using only Discrete Fourier Transform (DFT) in the traditional SLM technique, we propose to use Discrete Cosine Transform (DCT) and Discrete Sine Transform (DST) as well as DFT in the selection process, to get the lowest PAPR. The simulation results, based on simplified long term evaluation (LTE) system, show that the proposal technique can reduce the PAPR to about 3.2dB compared to traditional OFDM for N=512 at clipping probability of 10−3 with low additive complexity.