This paper presents results on the achievable spectral efficiency and on theenergy efficiency for a wireless multiple-input-multiple-output (MIMO) linkoperating at millimeter wave frequencies (mmWave) in a typical 5G scenario. Twodifferent single-carrier modem schemes are considered, i.e., a traditionalmodulation scheme with linear equalization at the receiver, and asingle-carrier modulation with cyclic prefix, frequency-domain equalization andFFT-based processing at the receiver; these two schemes are compared with aconventional MIMO-OFDM transceiver structure. Our analysis jointly takes intoaccount the peculiar characteristics of MIMO channels at mmWave frequencies,the use of hybrid (analog-digital) pre-coding and post-coding beamformers, thefinite cardinality of the modulation structure, and the non-linear behavior ofthe transmitter power amplifiers. Our results show that the best performance isachieved by single-carrier modulation with time-domain equalization, whichexhibits the smallest loss due to the non-linear distortion, and whoseperformance can be further improved by using advanced equalization schemes.Results also confirm that performance gets severely degraded when the linklength exceeds 90-100 meters and the transmit power falls below 0 dBW.
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