Abstract
In this paper we propose a multi-criteria comparison of faster than Nyquist (FTN) against Nyquist signaling. To conduct this study we consider uncoded links and maximum likelihood receivers, we fix both the spectral efficiency (SE) and the bandwidth of the links, and we compare the quality of the latter for a given received signal to noise ratio (SNR) taking into account the peak-to-average power ratio (PAPR). Indeed, this metric directly affects the power amplifier (PA) efficiency and depends on the considered modulation and shaping filter. In addition, as already mentioned in the literature, the PAPR varies significantly with the compression factor of FTN signaling. Based on this, we built a penalized SNR expression in order to consider the PAPR effect and offer a clear representation to fairly compare different FTN and Nyquist signaling. Through this multi-criteria approach, required for practical applications, we show that the best waveforms are FTN. As an example, FTN links may provide a gain up to 2.5 dB for 2.5 bits/sIHz for a bit error rate (BER) of 10–4 compared to the best Nyquist link.
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