On the practical benefit of hexagonal multicarrier faster-than-Nyquist signaling

In this paper, we investigate the hexagonal multicarrier faster-than-Nyquist (MFTN) signaling, which is considered to be a more promising technique than conventional rectangular MFTN in future communication systems. Specifically, different from previous works that mainly focused on the minimal Euclidean distance (or Mazo limit), we study the intersymbol interference (ISI) and/or intercarrier interference (ICI) introduced by time-frequency packing in MFTN signaling systems. We theoretically prove the asymptotical equivalence of the hexagonal MFTN and conventional rectangular MFTN when the time packing factor is small enough. Moreover, we also demonstrate the potential benefit of hexagonal MFTN than conventional rectangular MFTN signaling system for moderate time-frequency packing. Numerical results validate the theoretical analyses.