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In the past few years, some alternatives to the Orthogonal Frequency DivisionMultiplexing (OFDM) modulation have been considered to improve its spectralcontainment and its performance level in the presence of heavy Doppler shifts.This paper examines a novel modulation, named Doppler-Resilient UniversalFiltered MultiCarrier (DR-UFMC), which has the objective of combining theadvantages provided by the Universal Filtered MultiCarrier (UFMC) modulation(i.e., better spectral containment), with those of the Orthogonal TimeFrequency Space (OTFS) modulation (i.e., better performance in time-varyingenvironments). The paper contains the mathematical model and detailedtransceiver block scheme of the newly described modulation, along with anumerical analysis contrasting DR-UFMC against OTFS, OFDM with one-tapfrequency domain equalization (FDE), and OFDM with multicarrier multisymbollinear MMSE processing. Results clearly show the superiority, with respect tothe cited benchmarks, of the newly proposed modulation in terms of achievablespectral efficiency. Interestingly, it is also seen that OFDM, when consideredin conjunction with multicarrier multisymbol linear minimum mean squares error(MMSE) processing, performs slightly better than OTFS in terms of achievablespectral efficiency.

Doppler-Resilient Universal Filtered MultiCarrier (DR-UFMC): A Beyond-OTFS Modulation