Peak to Average Power Reduction using Radix-2 Decimation in Frequency Fast Fourier Transform in OFDM System.

Orthogonal Frequency Division Multiplexing (OFDM) is used for wideband data communications over mobile radio FM channels, High-bit-rate Digital Subscriber Lines (HDSL, 1.6Mbps), Asymmetric Digital Subscriber Lines (ADSL, up to 6Mbps), Very-high-speed Digital Subscriber Lines (VDSL, 100Mbps), Digital Audio Broadcasting (DAB), and High Definition Television (HDTV) terrestrial broadcasting. The OFDM system has a high peak-to-average power ratio (PAPR) that can cause unwanted saturation in the power amplifiers. In order to avoid nonlinear distortion, highly linear amplifiers are required which cause a severe reduction in power efficiency. In this paper, a new scheme for PAPR reduction is proposed using Radix-2 Discrete in Frequency (DIF) Fast Fourier Transform (FFT). In proposed scheme we have used signal processing technique to reduce PAPR. The proposed scheme provides 3.3dB performance improvement in PAPR to than standard OFDM system as simulated in MATLAB.