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Delay-Phase Joint Optimization for Wideband Hybrid Precoding Massive MIMO Systems with Angular Spread
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DOI：10.1007/s11277-025-11891-4.png)
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Abstract
En 中文
Terahertz (THz) communications are considered a core technology for beyond-5G and 6G networks, offering ultra-wide bandwidths but facing significant challenges due to severe path loss, beam squint, and angular spread sensitivity. This paper proposes a novel wideband hybrid precoding framework for multi-user THz massive MIMO (Multiple-Input Multiple-Output) systems, where the base station employs a Uniform Planar Array (UPA) to support 3D beamforming. The system model incorporates a THz-specific wideband channel, accounting for frequency-selective fading and molecular absorption. The proposed approach formulates the hybrid precoding problem as a temporal-phase matrix decomposition, supporting multiple implementations including DP-AltMin, TTD (True Time Delay) assisted DPP, and MO-AltMin architectures. Extensive simulations demonstrate that the proposed DP-AltMin precoding achieves a 20.6% improvement in sum spectral efficiency over spatially sparse precoding and a 13.8% gain over TTD-assisted hybrid schemes under an angular spread of \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$5<^>\circ$$\end{document} and \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\textrm{SNR} = 10$$\end{document} dB. Moreover, the proposed solution effectively mitigates beam squint across 64 subcarriers and scales efficiently with increasing user density. These findings confirm the viability of the proposed precoding methods for scalable, high-capacity THz access networks.
Keywords:
Terahertz communications
Hybrid precoding
Wideband massive MIMO
Beam squint
Uniform planar array
Angular spread
Journal
IF:
2.2
Papers:
739
Citations:
1.2W