Unified Far-Field and Near-Field in Holographic MIMO: A Wavenumber-Domain Perspective

Chen Y, Guo X, Zhou G, Jin S, Ng DWK, Wang Z (2025)

Publication Type: Journal article

Publication year: 2025

Journal

IEEE Communications Magazine IEEE Institute of Electrical and Electronics

Book Volume: 63

Pages Range: 30-36

Journal Issue: 1

DOI: 10.1109/MCOM.001.2300845

Abstract

This article conceives a unified representation for near-field and far-field holographic multiple-input multiple-output (HMIMO) channels, addressing a practical design dilemma: "Why does the angular-domain representation no longer function effectively?"To answer this question, we pivot from the angular domain to the wavenumber domain and present a succinct overview of its underlying philosophy. In re-examining the Fourier plane-wave series expansion that recasts spherical propagation waves into a series of plane waves represented by Fourier harmonics, we characterize the HMIMO channel employing these Fourier harmonics having different wavenumbers. This approach, referred to as the wavenumebr-domain representation, facilitates a unified view across the far-field and the near-field. Furthermore, the limitations of the DFT basis are demonstrated when identifying the sparsity inherent to the HMIMO channel, motivating the development of a wave-number-domain basis as an alternative. We then present some preliminary applications of the proposed wavenumber-domain basis in signal processing across both the far-field and near-field, along with several prospects for future HMIMO system designs based on the wavenumber domain.

Authors with CRIS profile

Gui Zhou Lehrstuhl für Digitale Übertragung (IDC)

Involved external institutions

Beijing University of Posts and Telecommunications (BUPT) / 北京邮电大学 CN China (CN) Southeast University / 东南大学 CN China (CN) University of New South Wales (UNSW) AU Australia (AU) Tsinghua University CN China (CN)

How to cite

APA:

Chen, Y., Guo, X., Zhou, G., Jin, S., Ng, D.W.K., & Wang, Z. (2025). Unified Far-Field and Near-Field in Holographic MIMO: A Wavenumber-Domain Perspective. IEEE Communications Magazine, 63(1), 30-36. https://doi.org/10.1109/MCOM.001.2300845

MLA:

Chen, Yuanbin, et al. "Unified Far-Field and Near-Field in Holographic MIMO: A Wavenumber-Domain Perspective." IEEE Communications Magazine 63.1 (2025): 30-36.

BibTeX: Download