Discrete Wavelet Transform with Discrete Cosine Transform (DCT) For Peak-To-Average Power Ratio (PAPR) Reduction In OFDM System

Orthogonal Frequency Division Multiplexing (OFDM) has been widely used in high data rate wireless communications systems. High transmission bit rate, high spectral efficiency and robustness to frequency fading channels is the benefit for the application of OFDM. . However, high Peak-to-Average Power Ratio (PAPR) value is still the agenda which being looked into by a lots of researchers who are specialize in OFDM. This is because high value of PAPR restrict the achievement of signal transmission. Several techniques has been proposed to reduce PAPR. This paper discusses the improved method of Discrete Wavelet Transform to bring down PAPR values of OFDM system. This proposed methods able to provide better performance in PAPR reduction. The proposed method of DCT precoded Wavelet with the 1024 numbers of subcarriers improves the greatest performance by 17.268%.