PAPR reduction in SFBC-MIMO-MC-CDMA systems using method of attenuation complex chips

The combination of Multi-Carrier Code Division Multiple Access (MC-CDMA) with Multiple-Input Multiple-Output (MIMO) is a technology of one of the most promising systems for broadband modern wireless communications. However, MC-CDMA signals have a high peak-to-average power ratio (PAPR), which causes signal distortion because of the use of a high-power amplifier (HPA) in the transmitter. In our work, we propose a PAPR reduction scheme for space-frequency block coding MIMO-MC-CDMA downlink transmissions using method of attenuating complex chips, by multiplying every complex chip by real decreasing values. Simulation results prove that the proposed method showed a significant improvement in PAPR reduction performance, with a low computational complexity and without side information. Additionally, the attenuating complex chips is compared to P-SLM at the term of bit-error-rate (BER) and PAPR reduction using once the linear amplifier (SSPA) and another time without its presence.