An improved SLM scheme with low implementation complexity to reduce PAPR performance of OFDM systems

Orthogonal-frequency-division-multiplexing (OFDM) is one of the most important transmission techniques for future wireless communication systems. However, the high peak-to-average power ratio (PAPR) is one major drawback of OFDM systems. Because selected mapping (SLM) algorithm can reduce PAPR effectively without distortion, it has been a hot researching point. But the high computational requirement is a serious obstacle for the appliance of conventional SLM algorithm. Based on analysis and comparison of SLM improvements including DSLM algorithm, Time-domain linear combination and repeated clip-and-filter operation, an improved SLM algorithm is proposed to reduce the PAPR effectively. The improved SLM algorithm can achieve the implementation of low computation and complexity. Theoretical analysis and simulation results show that the improved SLM algorithm can effectively suppress PAPR, while reducing the algorithm complexity.