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Orthogonal frequency-division multiplexing (OFDM) time-domain signals exhibithigh peak-to-average (power) ratio (PAR), which requires linear radio-frequencychains to avoid an increase in error-vector magnitude (EVM) and out-of-band(OOB) emissions. In this paper, we propose a novel joint PAR reduction andprecoding algorithm that relaxes these linearity requirements in massivemultiuser (MU) multiple-input multiple-output (MIMO) wireless systems.Concretely, we develop a novel alternating projections method, which limits thePAR and transmit power increase while simultaneously suppressing MUinterference. We provide a theoretical foundation of our algorithm and providesimulation results for a massive MU-MIMO-OFDM scenario. Our results demonstratesignificant PAR reduction while limiting the transmit power, without causingEVM or OOB emissions.

Alternating Projections Method for Joint Precoding and Peak-to-Average-Power Ratio Reduction