OFDM Signals drawbacks & its reducing techniques using Clipping & SLM

Now a days there is a rapid growth in the field of communication and the requirement of high speed & secured data transmission is increased. Multicarrier technique Orthogonal frequency division multiplexing (OFDM) modulation technique is a newly technique which support high speed data transmission. Peak to average power ratio (PAPR) is one major drawback in OFDM systems. A large PAPR would drive Power amplifier at the transmitter into saturation, producing interference among the subcarriers that degrades the BER performance and corrupts the spectrum of the signal. The research work describes the hybrid i.e. the combination of clipping & SLM techniques for the reduction of PAPR in OFDM communication systems. Clipping is one of the simplest techniques, but this method introduces distortion to the transmitted signal due to the clipping of signal itself and Selective Mapping is the distortionless method for PAPR reduction. In the method of clipping the high peaks of the OFDM signal prior to passing it through the power amplifier.the book demonstrates the combination of two techniques i.e. clipping & SLM named as hybrid technique for the further reduction of PAPR.