An Improved SLM Method Based on Split Preference and Four-Dimensional Hyper-Chaotic Sequences

The traditional selective mapping method can be applied to the orthogonal frequency division multiplexing (OFDM) system to improve the peak-to-average power ratio (PAPR) reduction performance, which has to transmit plenty of side information and thus lead to the increase of complexity. To simplify and further improve the system, an improved SLM method is presented in this paper, which uses nonlinear four-dimensional hyper-chaotic phase sequence to transform the data into two segmented sequences respectively and then Hadamard transform is applied. Finally, the selected data with minimum PAPR will be transmitted after using IFFT transform to every row of the data. Simulation results show that the proposed scheme can significantly improve the PAPR reduction performance.