PAPR reduction scheme in SFBC MIMO-OFDM systems without side information

This work presents a novel peak-to-average power ratio (PAPR) reduction scheme, namely extended selected mapping (eSLM), in space-frequency block coding (SFBC) MIMO-OFDM systems. By introducing phase rotations and amplitude extensions into so-called extension matrices, the candidate signals with lowest PAPR can be selected and the receiver is able to identify index of the selected candidate without transmission of side information. Thus, the proposed eSLM has higher spectrum efficiency compared to conventional SLM-based methods which demand side information. Furthermore, the extended matrices preserve orthogonality of the space-frequency encoded blocks, which allows low-complexity decoding at the receiver. It shows through simulations that the proposed eSLM outperforms existing blind SLM-based method, and has slight performance gap with costly oSLM scheme.