In this paper

we propose a new method to reduce the computational complexity of the conventional Selective Mapping（SLM）algorithm in the Multiple Input Multiple Output Orthogonal Frequency Division Multiplexing（MIMO-OFDM）system.The original frequency domain signals are first divided into real and imaginary parts.Then the two parts are operated by different phase rotation respectively.The corresponding time domain signals are finally obtained by using inverse fast Fourier transform operations.It can produce more candidates with different Peak to Average Power Ratio（PAPR）by different combination of real and imaginary parts in antennas.The simulation results show that the proposed method can reduce the PAPR of MIMO-OFDM signals effectively.In addition

compared with conventional SLM algorithm

the proposed method can reduce the algorithm computation complexity significantly.