We introduce a novel technique for improving PA efficiency and coverage of communication links, especially advantageous for the uplink at high frequencies (cm/mm-Waves). The technique is based on a superposition of several DFT-s-OFDM (a.k.a. SC-FDM) signals, whose modulated symbol sequences and pulse shaping functions are coupled in a specially crafted manner. The resulting low-PAPR waveforms enable transmission with essentially no output power back-off (OBO), complying with rigid spectral requirements even when using PAs with highly non-linear behavior, expected from 5G cost-effective RF solutions. A relatively simple modification of a plain DFT-s-OFDM transmitter is required to support these waveforms.

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