Degree of Freedom Analysis for Holographic MIMO Based on a Mutual-Coupling-Compliant Channel Model

doi:10.12142/ZTECOM.202401005

ZTE Communications ›› 2024, Vol. 22 ›› Issue (1): 34-40.DOI: 10.12142/ZTECOM.202401005

收稿日期:2023-12-14 出版日期:2024-03-28 发布日期:2024-03-28

Degree of Freedom Analysis for Holographic MIMO Based on a Mutual-Coupling-Compliant Channel Model

SUN Yunqi¹^,²(), JIAN Mengnan¹^,², YANG Jun¹^,², ZHAO Yajun¹^,², CHEN Yijian¹^,²

^1.State Key Laboratory of Mobile Network and Mobile Multimedia Technology, Shenzhen 518055, China
^2.ZTE Corporation, Shenzhen 518057, China

Received:2023-12-14 Online:2024-03-28 Published:2024-03-28
About author:SUN Yunqi (sun.yunqi@zte.com.cn) received his BE and PhD degrees from Tsinghua University, China in 2017 and 2022, respectively. He is currently an engineer with ZTE Corporation. His research interests include massive MIMO, holographic MIMO, antenna theory, and radio sensing.
JIAN Mengnan received her BS degree in information engineering from Beijing Institute of Technology, China in 2016 and MS degree from Tsinghua University, China in 2019. She is currently an engineer with ZTE Corporation. Her research interests include massive MIMO, reconfigurable intelligent surfaces, and holographic MIMO.
YANG Jun received his BS degree in geophysics from the China University of Geosciences (Wuhan) in 2011 and joint-training PhD degree in geophysics from the University of Science and Technology of China and the University of North Carolina at Charlotte, USA in 2016. He is currently an algorithm engineer with ZTE Corporation. His research interests include reconfigurable intelligent surfaces, MIMO channel modeling, and computational electromagnetics.
ZHAO Yajun received his BE, MS, and PhD degrees. Since 2010, he has assumed the role of Chief Engineer at the Wireless and Computing Product R&D Institute, ZTE Corporation. Prior to this, he contributed to wireless technology research at the Wireless Research Department, Huawei. Currently, his primary focus centers on 5G standardization technology and the advancement of future mobile communication technology, particularly 6G. His research pursuits encompass a broad spectrum, including reconfigurable intelligent surfaces (RIS), spectrum sharing, flexible duplex, CoMP, and interference mitigation. He has played an instrumental role in founding the RIS Tech Alliance (RISTA) and currently holds the position of Deputy Secretary General within the organization. Additionally, he is a founding member of the RIS task group under the purview of the China IMT-2030 (6G) Promotion Group, where he serves as the deputy leader.
CHEN Yijian graduated from Central South University, China. He is currently working at ZTE Corporation. His research interests include reconfigurable intelligent metasurfaces, extremely large-scale MIMO technology, and electromagnetic information theory.
Supported by:
National Key Research and Development Program of China(2020YFB1807600)

摘要/Abstract

Abstract:

Degree of freedom (DOF) is a key indicator for spatial multiplexing layers of a wireless channel. Traditionally, the channel of a multiple-input multiple-output (MIMO) half-wavelength dipole array has a DOF that equals the antenna number. However, recent studies suggest that the DOF could be less than the antenna number when strong mutual coupling is considered. We utilize a mutual-coupling-compliant channel model to investigate the DOF of the holographic MIMO (HMIMO) channel and give a upper bound of the DOF with strong mutual coupling. Our numerical simulations demonstrate that a dense array can support more DOF per unit aperture as compared with a half-wavelength MIMO system.

Key words: channel model, degree of freedom, holographic MIMO, mutual coupling

. [J]. ZTE Communications, 2024, 22(1): 34-40.

SUN Yunqi, JIAN Mengnan, YANG Jun, ZHAO Yajun, CHEN Yijian. Degree of Freedom Analysis for Holographic MIMO Based on a Mutual-Coupling-Compliant Channel Model[J]. ZTE Communications, 2024, 22(1): 34-40.

图/表 8

Table 1 ULA and UPA configurations for mutual coupling simulation

Configuration Index	Configuration Type	Distance/ $λ$	Spacing/ $λ$	Antenna Number	Aperture Area
1	ULA_FF	200	0.5	16	$7.5 λ$
2	ULA_NF	10	0.5	16	$7.5 λ$
3	ULA_FF_MC	200	0.25	16	$3.75 λ$
4	ULA_NF_MC	10	0.25	16	$3.75 λ$
5	ULA_FF_DEN	200	0.25	31	$7.5 λ$
6	ULA_NF_DEN	10	0.25	31	$7.5 λ$
7	ULA_FF_UDEN	200	0.1	76	$7.5 λ$
8	ULA_NF_UDEN	200	0.1	76	$7.5 λ$
9	UPA_FF	200	0.5	16	$1.5 λ × 1.5 λ$
10	UPA_NF	10	0.5	16	$1.5 λ × 1.5 λ$
11	UPA_FF_MC	200	0.25	16	$0.75 λ × 0.75 λ$
12	UPA_NF_MC	10	0.25	16	$1.5 λ × 1.5 λ$
13	UPA_FF_DEN	200	0.25	49	$1.5 λ × 1.5 λ$
14	UPA_NF_DEN	10	0.25	49	$1.5 λ × 1.5 λ$
15	UPA_FF_UDEN	200	0.1	256	$1.5 λ × 1.5 λ$
16	UPA_NF_UDEN	200	0.1	256	$1.5 λ × 1.5 λ$

Table 1 ULA and UPA configurations for mutual coupling simulation

Configuration Index	Configuration Type	Distance/ $λ$	Spacing/ $λ$	Antenna Number	Aperture Area
1	ULA_FF	200	0.5	16	$7.5 λ$
2	ULA_NF	10	0.5	16	$7.5 λ$
3	ULA_FF_MC	200	0.25	16	$3.75 λ$
4	ULA_NF_MC	10	0.25	16	$3.75 λ$
5	ULA_FF_DEN	200	0.25	31	$7.5 λ$
6	ULA_NF_DEN	10	0.25	31	$7.5 λ$
7	ULA_FF_UDEN	200	0.1	76	$7.5 λ$
8	ULA_NF_UDEN	200	0.1	76	$7.5 λ$
9	UPA_FF	200	0.5	16	$1.5 λ × 1.5 λ$
10	UPA_NF	10	0.5	16	$1.5 λ × 1.5 λ$
11	UPA_FF_MC	200	0.25	16	$0.75 λ × 0.75 λ$
12	UPA_NF_MC	10	0.25	16	$1.5 λ × 1.5 λ$
13	UPA_FF_DEN	200	0.25	49	$1.5 λ × 1.5 λ$
14	UPA_NF_DEN	10	0.25	49	$1.5 λ × 1.5 λ$
15	UPA_FF_UDEN	200	0.1	256	$1.5 λ × 1.5 λ$
16	UPA_NF_UDEN	200	0.1	256	$1.5 λ × 1.5 λ$

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Degree of Freedom Analysis for Holographic MIMO Based on a Mutual-Coupling-Compliant Channel Model

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