Faster-than-Nyquist Signaling for MIMO Communications

TL;DR

This paper investigates the capacity of Faster-than-Nyquist (FTN) signaling in MIMO channels, demonstrating capacity-achieving strategies for both frequency-flat and frequency-selective scenarios, highlighting potential spectral efficiency gains.

Contribution

It provides a comprehensive analysis of FTN signaling capacity in MIMO channels and identifies optimal precoding and waterfilling strategies for different channel conditions.

Findings

Capacity-achieving precoding in time for frequency-flat MIMO FTN.

Joint waterfilling in time, space, and frequency for frequency-selective channels.

FTN signaling can significantly improve spectral efficiency.

Abstract

Faster-than-Nyquist (FTN) signaling is a non-orthogonal transmission technique, which has the potential to provide significant spectral efficiency improvement. This paper studies the capacity of FTN signaling for both frequency-flat and for frequency-selective multiple-input multiple-output (MIMO) channels. We show that precoding in time and waterfilling in space is capacity achieving for frequency-flat MIMO FTN. For frequency-selective fading, joint waterfilling in time, space and frequency is required.