The Evolution of Faster-Than-Nyquist Signaling

The fifty-year progress of faster-than-Nyquist (FTN) signaling is surveyed. FTN exploits non-orthogonal dense symbol packing in the time domain for sake increasing data rate attained. After reviewing system models both conventional Nyquist-based and transceivers, we survey evolution techniques, including their low-complexity detection channel estimation. Furthermore, addition to classic philosophy, introduce recent frequency-domain filtering precoding aided schemes. When relying on precoding, information becomes related eigenvalues an FTN-specific intersymbol interference matrix, which provides a unified framework associated information-theoretic analysis simplifies power allocation specifically designed We show that scheme combined with bespoke employing realistic raised-cosine shaping filter achieves Shannon capacity ideal rectangular filters.