Low-Complexity PAPR Minimization for Symbol Level Precoded Multi-User MISO-OFDM System

This letter proposes a method exploiting constructive interference (CI) to reduce the transmit signal’s peak-to-average power ratio (PAPR), while keeping total transmission as low possible. An optimization problem that jointly performs minimization and PAPR reduction is formulated, which however difficult solve directly due non-convex constraint. To obtain feasible solution in complexity, by using vectorization introducing regularization factor, we relax The original transformed into convex can be solved with an improved fast iterative shrinkage-thresholding algorithm (FISTA). Numerical results are presented show 1dB savings terms of 52% compared state-of-the-art techniques.