A Hybrid Clipping and SLM Technique for PAPR Reduction in OFDM Systems

The advantages of the orthogonal frequency division multiplexing sys-tem OFDM such as its efficient use of the spectrum and immunity against multi-path fading make them the superior technology for the high data rate of wireline and wireless communication systems. However, the high peak-to-average power ratio PAPR of the OFDM signal is one of its main drawbacks. Consequently, many techniques, including selective mapping SLM and clipping-filtering CF, have been recommended to deal with the PAPR problem. The PAPR is decreased but the bit error rate is negatively impacted by the clipping approach. In contrast, the SLM technique decreases the PAPR of an OFDM signal without causing signal distortion, but it increases the complexity of the transmitter. In this paper, we provide a hybrid selective mapping-clipping scheme (HSLMC) for OFDM systems PAPR reduction. In order to decrease the computational complexity, the SLM is employed in iteration with a threshold of PAPR and four iterations; if the PAPR of the OFDM signal is still larger than the threshold after the fourth iteration, clipping is applied. The simulation results show that, in comparison to CF, the proposed method performs better in terms of bit error rate (BER). On the other hand, the computational complexity of the proposed technique is significantly lower than SLM with an equivalent PAPR decrease.