Papr Reduction in Single Carrier Modulation with Hybrid Beamforming

Single carrier modulation with hybrid beamforming is a promising choice for sub-THz communication, thanks to its relaxed hardware requirements. However, the peak-to-averagepower ratio (PAPR) of single carrier modulation in a multi-user MIMO scenario is still a concern. In this work, we develop a PAPR reduction technique for single carrier modulation operating with hybrid beamforming. We propose to add a PAPR reduction signal (PRS) to the precoded information symbols in the baseband. The design of PRS is written as an constrained optimization problem. An algorithm based on successive convex approximation is proposed to solve the optimization problem. Our analysis shows that by trading off only a little SINR, a considerable PAPR reduction can be achieved. Further, our simulations reveal that the proposed scheme achieves a significant performance gain compared to the classical single carrier system in the presence of power amplifier distortion.