A New ZCT Precoding Based SLM Technique for PAPR Reduction in OFDM Systems

High Peak to Average Power Ratio (PAPR)
reduction is still a most important challenge in Orthogonal
Frequency Division Multiplexing (OFDM) system. In this paper,
we propose a novel Zadoff-Chu matrix Transform (ZCT)
precoding based Selected Mapping (SLM) technique for PAPR
reduction in OFDM systems. This technique is based on
precoding the constellation symbols with ZCT after the
multiplication of phase rotation factor and before the Inverse
Fast Fourier Transform (IFFT) in SLM based OFDM (SLMOFDM)
Systems. At clipping probability of 10-3, simulation
results show that our proposed technique can reduce the PAPR
up to 5dB for =64 and V=16. Additionally, ZCT based SLMOFDM
systems also take advantage of frequency variations of
the communication channel and can also offer substantial
performance gain in fading multipath channels.