The reduction of PAPR in OFDM systems using clipping and SLM method

Orthogonal Frequency-division multiplexing is an attractive technique for high-bit-rate communication systems. It has been widely used in modern wireless communication because of its high data rate, immunity to delay spread and frequency spectral efficiency and other advantages. Besides these advantages, one of the major drawback of OFDM is the high Peak-to-average-power ratio (PAPR) of the Transmitter´s output signal, as it restricts the system performance. Clipping method is the simplest method to reduce the PAPR of the OFDM system, here we are using the Iterative Clipping and Filtering (ICF) method as it provides better results compared to Clipping method. Selective Mapping (SLM) method is another approach which provides good performance for reduction of PAPR, where the actual transmit signal is selected from a set of signals to construct the transmitted signal. In this paper, both Iterative Clipping and SLM method is combined to give better PAPR compared to individual methods. The BER for the above method is also improved. The results also prove that the PAPR and BER of combined method i.e. Clipping-SLM method is better than Clipping and SLM method individually.