Performance Improvement of SLM-Based MC-CDMA System using MIMO Technique

This paper presents performance of SeLective Mapping (SLM)-based Multicarrier Code Division Multiple Access (MC-CDMA) system with MIMO technique. MC-CDMA fulfills the requirement of the forthcoming generation of wireless communication and offers high data rate with additional benefit of low Inter Symbol Interference (ISI). However, high Peak to Average Power Ratio (PAPR) is the major limitation of the MC-CDMA system. This high PAPR reduces efficiency of High Power Amplifier (HPA) and radio frequency components at the base station. To reduce PAPR, SLM is a simple approach, in which input data sequences are multiplied by M _p phase sequences before multicarrier modulation, and then the one with the minimal value of PAPR is chosen for transmission. In this work MIMO technique is used with SLM-based MC-CDMA downlink transmission system, which not only reduces PAPR but improves the BER performance. The results show that the PAPR of the proposed scheme is lower than the SLM-based MC-CDMA system. In addition, BER performance of proposed scheme outperforms SLM-based MC-CDMA system. A comparative study of PAPR and BER performance shows that low PAPR can be achieved by the proposed scheme with improved BER.