DCT Precoded SLM Technique for PAPR Reduction in OFDM Systems

High Peak to Average Power Ratio (PAPR) is still a
most important challenge in Orthogonal Frequency Division
Multiplexing (OFDM) system. In this paper, we propose a
Discrete Cosine Transform (DCT) precoding based SLM
technique for PAPR reduction in OFDM systems. This
technique is based on precoding the constellation symbols with
DCT precoder after the multiplication of phase rotation factor
and before the Inverse Fast Fourier Transform (IFFT) in
SLM-OFDM System. Simulation results show that our
proposed technique can reduce the PAPR to about 5.5dB for
=64 and V=16 at clipping probability of 10-3.