PAPR reduction techniques with cross SLM schemes for MIMO-OFDM systems

The multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) transmission strategy has been appointed to be a standard of fourth-generation (4G) wireless communication systems, but it still has to cope with the main weakness and challenge of OFDM-based techniques, including the high peak-to-average power ratio (PAPR). This paper proposes the cross-modified MIMO selected mapping (SLM) algorithm to obtain superior PAPR reduction performance and reduce system complexity compared with conventional SLM schemes. The algorithm combines a novel SLM scheme, called cross-individual SLM, with modified-individual SLM to create more alternative OFDM signal sequences for overall transmitters. As a result, with increasing the number of transmitting antennas, our proposed technique would have potentials to provide better PAPR reduction performance.