ADVANCED APPROACH FOR REDUCING PAPR IN OFDM SYSTEMS TO MINIMIZE INTERFERENCE EFFECT

Nutan Kumari, Simarpreet Kaur

Abstract: Orthogonal Frequency Division Multiplexing is a popular modulation scheme and finds its use in wireless communication and mostly drawing attention towards 4G mobile communication. Wireless Technology is cardinal as it offers high data rate transmission, which is needed for efficacious communication. The main features of OFDM technique are that it can easily acclimate to severe channel conditions without complex time-domain equalization and is vigorous against Intersymbol Interference (ISI) and fading caused by multipath propagation. But the OFDM system faces the problem of PAPR i.e. Peak to Average Power Ratio. This PAPR effect is tried to be reduced using a combined technique which makes use of clipping and filtering technique along with companding technique. The simulation results show us that the PAPR value reduces to 4.41dB with a value of 128 subcarriers. Earlier used approaches for PAPR reduction were SLM, PTS, Tone reservation etc. The proposed approach shows that PAPR effect is tried to be reduced to a great extent.

Keywords: OFDM, PAPR, BER ,FFT, IFFT etc.

DOI: https://doi.org/10.15623/ijret.2015.0408079