Work

Constrained Capacity for Faster-than-Nyquist Signaling in Frequency-Selective Fading Channels

Year: 2026

Type: preprint

Abstract: In this paper, we investigate the constrained capacity of discrete Fourier transform (DFT)-precoded faster-than-Nyquist (FTN) signaling over frequency-selective channels with finite-alphabet inputs. With a cyclic prefix (CP) and cyclic suffix (CS), the FTN and multipath induced intersymbol interference (ISI) is decomposed into parallel eigenchannels, whose gains are jointly determined by the folded FTN spectrum and the channel frequency response. Based on this decomposition, we derive the constrained capacity for finite-alphabet constellations and formulate a mismatched decoding achievable information rate for DFT-precoded FTN signaling without CP/CS, quantifying the finite-block rate loss caused by imperfect diagonalization. We find that even under mismatched decoding, FTN significantly improves upon Nyquist transmission.

Source: arXiv (Cornell University)

DOI: 10.48550/arxiv.2609.06639

Authors: Zhang, Zichao, Yuksel, Melda, Guvensen, Gokhan M., Yanikomeroglu, Halim

Institutions: Carleton University, Middle East Technical University

Language: English

Topic: Advanced Wireless Communication Techniques

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: green

Funder: Natural Sciences and Engineering Research Council of Canada

OpenAlex ID: W7211993889

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