An Efficient Clipping Method for PAPR Reduction in OFDM Systems

When employing multicarrier modulation, the subcarriers should be orthogonal to each other to improve reliability, which is known as the Orthogonal Frequency Division Multiplexing (OFDM). The operation point of the high power amplifier (HPA) on the transmitter side will change to the saturation region with rising in peak to average power ratio(PAPR)leads to in-band distortion (IBD) and out-of-band radiation (OBD). Hence PAPR is considered the biggest limitation in OFDM systems. Many PAPR reduction schemes can be broadly classified into two groups which are distortion-less systems like Selective Mapping (SLM) and Partial Transmit Sequence (PTS) and pre-distortion systems like clipping and companding. This study presents how to overcome PAPR in terms of performance by employing an Iterative Clipping and Filtering (ICF) technique for PAPR reduction. This method is simple to deploy and reduces PAPR by modifying the amplitude distribution (AD) of the OFDM signals to achieve uniform distribution(UD). This paper summarizes three distinct approaches for reducing PAPR by clipping followed by filtering that are not directly dependent on a clipping ratio(CR) parameter and enhances the PAPR performance using MATLAB Simulation