PAPR reduction of alamouti coded MB-OFDM UWB signals by using a phase-offset SLM

Ultra Wideband (UWB) is a solution for short range high speed wireless communication applications. For effective utilization of the total UWB spectrum, Multiband Orthogonal Frequency Division Multiplexing (MB-OFDM) is a suitable candidate. To achieve the higher data rates and high capacity, both multiple-input multiple-output (MIMO) and coding techniques are exploited. Hence, a combination of MB-OFDM UWB and Alamouti Space-frequency block coding (SFBC) increases the capacity of UWB systems, achieves better diversity and coding gain and improves overall performance of the system. However, like OFDM, Alamouti coded MB-OFDM UWB signal is also suffering with high PAPR. A Selected mapping (SLM) technique is a one of the popular PAPR reduction technique for MIMO-OFDM systems. In this scheme, by rotating the original MIMO-OFDM signal by different phase sequences, different MIMO-OFDM symbol representations are generated and select the signal with minimum PAPR is transmitted. Hence, in this paper, the Alamouti coded MBOFDM UWB signal performance is analyzed and we are proposing a phase offset SLM scheme, to reduce the PAPR of the Alamouti coded MB-OFDM UWB signals. In our analysis, the performance measures are BER and CCDF.