Mobile communications has become one of the most developed technologies in the last two decades. Strong demand to increase system capacity is still growing dramatically and non-orthogonal transmission schemes are being considered as a potential solution to improve spectral-power efficiency. The non-orthogonal transmission scheme called Faster-Than-Nyquist (FTN) signaling is surveyed in this paper. FTN is analyzed in both time and frequency domains to show the reason behind its higher capacity as compared to the Nyquist case.
Capacity computations are presented for Faster-Than-Nyquist (FTN) signaling in the presence of interference from neighboring frequency bands. It is shown that Shannon's sinc pulses maximize the spectral efficiency for a multi-access channel, where spectral efficiency is defined as the sum rate in bits per second per Hertz. Comparisons using root raised cosine pulses show that the spectral efficiency decreases monotonically with the roll-off factor. At high signal-to-noise ratio, these pulses have an additive gap to capacity that increases monotonically with the roll-off factor.
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