On the Achievable Rates of Faster-than-Nyquist Signaling with Nyquist Receiver Sampling
2026 IEEE International Conference on Communications, ICC 2026, Glasgow, İngiltere, 24 - 28 Mayıs 2026, (Tam Metin Bildiri)
- Yayın Türü: Bildiri / Tam Metin Bildiri
- Doi Numarası: 10.1109/icc59461.2026.11587274
- Basıldığı Şehir: Glasgow
- Basıldığı Ülke: İngiltere
- Anahtar Kelimeler: achievable rate, finite-alphabet, folded spectrum, FTN signaling, Nyquist sampling
- Orta Doğu Teknik Üniversitesi Adresli: Evet
Özet
Faster-than-Nyquist (FTN) signaling is a classic signaling scheme for improved spectral efficiency compared to the conventional Nyquist signaling at the cost of increased complexity. In this paper, we investigate the FTN transmission with Nyquist receiver sampling (a.k.a. FTN-NR transmission), in order to simplify the receiver processing. Particularly, we derive a closed-form expression on the achievable rates of the FTN-NR transmission with arbitrary shaping pulses and Gaussian constellations. Our analysis reveals that this achievable rate relates closely to both the folded spectrum and folded squared spectrum of the pulse, which incorporate the folding effect of the signal spectrum due to the receiver sampling. Furthermore, we prove that the achievable rate of FTN-NR transmission is no better than that of Nyquist signaling despite the pulse shapes, when Gaussian constellation is applied. However, we then provide a numerical study on the rate with finite-alphabet constellations, and verify that FTN-NR transmission can outperform Nyquist signaling in terms of the achievable rate, especially when the modulation order is low. Our numerical results confirm our conclusions and report a noticeable achievable rate improvement of the FTN-NR transmission compared to Nyquist signaling under QPSK signaling.