Simulación de la técnica Constellation Extension de reducción de la PAPR de los sistemas OFDM

Abstract

OFDM modulation is a widely-used technique in wireless communications systems due to its major advantages, such as: immunity to multipath, high immunity to ISI and ICI, easy implementation in hardware, etc. However, OFDM has disadvantages, one of the most important is the high PAPR (Peak-to-Average Power Ratio), this problem causes that the high-power amplifiers (HPA) have a low efficiency, which produces both in and out band in the transmitted OFDM symbols. For this reason, this final career project is presented, which shows an analysis of the CE-POCS (Constellation Extension-Project onto Convex Sets) PAPR reduction technique. The results are presented in terms of CCDF (Complementary Cumulative Distribution Function) and PSD (Power Spectral Density). Both metrics are evaluated before applying the CE-POCS technique and then applying this scheme. CCDF measure the gain obtained when the CE-POCS PAPR reduction technique is applied while the PSD measured distortions reduction when the signal passes through the HPA.