Estudio y simulación de las técnicas Clipping, CE-POCS, OPS y SAP para reducir la PAPR en Li-Fi utilizando la modulación HACO-OFDM

Abstract

This final career project presents a study and simulation of the Clipping, CE-POCS (Constellation Extension - Project Onto Convex Sets), OPS (Orthogonal Pilot Sequences) and SAP (Simple Amplitude Predistortion) techniques to reduce PAPR (Peak-to-AveragePower Ratio) in a Li-Fi (Light Fidelity) system that uses HACO-OFDM (Hybrid Asymmetrically Clipped Optical - Orthogonal Frequency Division Multiplexing) modulation. The simulations are presented for 4 scenarios that are characterized by the way the pilots are located. The analysis of the PAPR is carried out through the CCDF (Complementary Cumulative Distribution Function) and the PSD (Power Spectral Density). In addition, the simulation of the receiver to analyze the BER (Bit Error Rate) is presented. A brief study of the transmitter and receiver for HACO-OFDM and the PAPR reduction techniques is carried out, focusing on the proposed techniques. The results are presented through graphs and tables that allow the comparison of each technique, concluding that the efficiency of the techniques is limited by the PAM-DMT (Pulse Amplitude Modulation-Discrete Multi Tone) block. Consequently, the reduction of PAPR using CE-POCS is not significant and the best technique to apply to a HACO-OFDM system is SAP.