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Millimeter-wave fifth-generation (5G) systems will extensively leverage massive multiple-input multiple-output (MIMO) architectures to improve their link performance. These array systems will employ many power amplifiers (PAs) operating at moderate output power (Pout), e.g., 16 PAs each with +7dBm Pout [1]. The PA energy efficiency is of paramount importance in MIMO systems for improved battery life...
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