Angular Domain PAPR Reduction for Massive Multi-user MIMO-OFDM Downlink

This paper proposes a novel angular domain peak-to-average power ratio (PAPR) reduction technique in massive multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems. Constant envelope (CE) precoding, OFDM modulation, and PAPR reduction are jointly implemented by solving a optimization problems in multi-beam (i.e., angle division multiple access, ADMA) systems. The proposed simplified iterative discrete estimation (SIDE) precoding scheme exploits the characteristics of massive MIMO-OFDM-ADMA system model and efficiently decrease PAPR effect with relatively lower computation complexity. Numerical results demonstrate that the proposed solution can achieve nearly optimal PAPR reduction performance, and scarcely any symbol error ratio (SER) performance loss.