Abstract:

Multi-input and Multi-output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) system has attracted great attention as a solution of highquality service for next generation of wireless communications. However, one of the main shortcomings of OFDM is its high Peak to Average Power Ratio (PAPR), which seriously limits the performance of High Power Amplifier (HPA). A PAPR reduction scheme based on MultiSelect Mapping (MSLM) is proposed for MIMO-OFDM system. This method divides the transmit data into multi-groups for scrambling code with the same group data length at the transmit end of the MIMO-OFDM system, and then performs Select Mapping (SLM). The MSLM can reduce the PAPR of MIMO-OFDM signal, meanwhile decrease the computational complexity. Simulation results show that, regarding PAPR, the MSLM method outperforms the conventional SLM algorithm by 1.3 when the select branch number is 16 and the value of Complementary Cumulative Distribution Function (CCDF) is 10-3. Its symbol error rate performance is also good.

Key words: communication, multi-input and multi-output orthogonal frenquency division multiplexing(MIMO-OFDM), peak to average power ratio(PAPR), select mapping(SLM), complementary cumulative distribution function, CCDF