The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. ex. Some numerals are expressed as "XNUMX".
Copyrights notice
The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. Copyrights notice
Stesen platform altitud tinggi (HAPS) diiktiraf sebagai teknologi yang menjanjikan untuk peluasan liputan dalam komunikasi mudah alih generasi keenam (6G) dan seterusnya. Tujuan kajian ini adalah untuk membangunkan sistem HAPS dengan radius liputan 100km dan kapasiti tinggi dengan memfokuskan kepada dua aspek berikut: struktur antena tatasusunan dan pemilihan pengguna. Sistem HAPS mesti bersama-sama menggunakan teknik berbilang input berbilang masukan (mMIMO) dan teknik MIMO berbilang pengguna untuk meningkatkan kapasitinya. Walau bagaimanapun, liputan yang dicapai oleh antena tatasusunan planar konvensional adalah terhad kepada kawasan bulat dengan jejari hanya berpuluh-puluh kilometer. Skim pemilihan pengguna separa ortogonal konvensional (SUS) berdasarkan ortogonal vektor saluran mencapai kapasiti tinggi, tetapi ia mempunyai kerumitan yang tinggi. Pertama, kertas kerja ini mencadangkan sistem mMIMO silinder untuk mencapai radius liputan ultra lebar 100km dan kapasiti tinggi. Kedua, kertas kerja ini membentangkan skema pemilihan pengguna (AUS) berasaskan sudut baru, di mana masalah pemilihan pengguna dirumuskan sebagai pemaksimumkan perbezaan sudut minimum antara pengguna ke atas semua kumpulan pengguna. Akhirnya, algoritma suboptimum (SA) kerumitan rendah untuk AUS juga dicadangkan. Dengan mengandaikan kawasan dengan radius 100km, hasil simulasi menunjukkan bahawa sistem mMIMO silinder yang dicadangkan meningkatkan nisbah isyarat-ke-gangguan-tambah-bunyi dengan lebih kurang. 12dB di sempadan kawasan, dan ia mencapai lebih kurang. Kapasiti 1.5 kali lebih tinggi daripada mMIMO konvensional yang menggunakan antena tatasusunan satah. Di samping itu, keputusan menunjukkan bahawa skim AUS yang dicadangkan meningkatkan persentil yang lebih rendah dalam pengagihan kapasiti sistem berbanding dengan SUS dan pemilihan pengguna rawak asas. Tambahan pula, kerumitan pengiraan SA yang dicadangkan adalah dalam susunan hanya 1/4000 berbanding SUS.
Koji TASHIRO
SoftBank Corp.
Kenji HOSHINO
SoftBank Corp.
Atsushi NAGATE
SoftBank Corp.
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Salinan
Koji TASHIRO, Kenji HOSHINO, Atsushi NAGATE, "Cylindrical Massive MIMO System with Low-Complexity Angle-Based User Selection for High-Altitude Platform Stations" in IEICE TRANSACTIONS on Communications,
vol. E105-B, no. 4, pp. 449-460, April 2022, doi: 10.1587/transcom.2021WWP0003.
Abstract: High-altitude platform stations (HAPSs) are recognized as a promising technology for coverage extension in the sixth generation (6G) mobile communications and beyond. The purpose of this study is to develop a HAPS system with a coverage radius of 100km and high capacity by focusing on the following two aspects: array antenna structure and user selection. HAPS systems must jointly use massive multiple-input multiple-output (mMIMO) and multiuser MIMO techniques to increase their capacity. However, the coverage achieved by a conventional planar array antenna is limited to a circular area with a radius of only tens of kilometers. A conventional semi-orthogonal user selection (SUS) scheme based on the orthogonality of channel vectors achieves high capacity, but it has high complexity. First, this paper proposes a cylindrical mMIMO system to achieve an ultra-wide coverage radius of 100km and high capacity. Second, this paper presents a novel angle-based user selection (AUS) scheme, where a user selection problem is formulated as a maximization of the minimum angular difference between users over all user groups. Finally, a low-complexity suboptimal algorithm (SA) for AUS is also proposed. Assuming an area with a 100km radius, simulation results demonstrate that the proposed cylindrical mMIMO system improves the signal-to-interference-plus-noise ratio by approx. 12dB at the boundary of the area, and it achieves approx. 1.5 times higher capacity than the conventional mMIMO which uses a planar array antenna. In addition, the results show that the proposed AUS scheme improves the lower percentiles in the system capacity distribution compared with SUS and basic random user selection. Furthermore, the computational complexity of the proposed SA is in the order of only 1/4000 that of SUS.
URL: https://global.ieice.org/en_transactions/communications/10.1587/transcom.2021WWP0003/_p
Salinan
@ARTICLE{e105-b_4_449,
author={Koji TASHIRO, Kenji HOSHINO, Atsushi NAGATE, },
journal={IEICE TRANSACTIONS on Communications},
title={Cylindrical Massive MIMO System with Low-Complexity Angle-Based User Selection for High-Altitude Platform Stations},
year={2022},
volume={E105-B},
number={4},
pages={449-460},
abstract={High-altitude platform stations (HAPSs) are recognized as a promising technology for coverage extension in the sixth generation (6G) mobile communications and beyond. The purpose of this study is to develop a HAPS system with a coverage radius of 100km and high capacity by focusing on the following two aspects: array antenna structure and user selection. HAPS systems must jointly use massive multiple-input multiple-output (mMIMO) and multiuser MIMO techniques to increase their capacity. However, the coverage achieved by a conventional planar array antenna is limited to a circular area with a radius of only tens of kilometers. A conventional semi-orthogonal user selection (SUS) scheme based on the orthogonality of channel vectors achieves high capacity, but it has high complexity. First, this paper proposes a cylindrical mMIMO system to achieve an ultra-wide coverage radius of 100km and high capacity. Second, this paper presents a novel angle-based user selection (AUS) scheme, where a user selection problem is formulated as a maximization of the minimum angular difference between users over all user groups. Finally, a low-complexity suboptimal algorithm (SA) for AUS is also proposed. Assuming an area with a 100km radius, simulation results demonstrate that the proposed cylindrical mMIMO system improves the signal-to-interference-plus-noise ratio by approx. 12dB at the boundary of the area, and it achieves approx. 1.5 times higher capacity than the conventional mMIMO which uses a planar array antenna. In addition, the results show that the proposed AUS scheme improves the lower percentiles in the system capacity distribution compared with SUS and basic random user selection. Furthermore, the computational complexity of the proposed SA is in the order of only 1/4000 that of SUS.},
keywords={},
doi={10.1587/transcom.2021WWP0003},
ISSN={1745-1345},
month={April},}
Salinan
TY - JOUR
TI - Cylindrical Massive MIMO System with Low-Complexity Angle-Based User Selection for High-Altitude Platform Stations
T2 - IEICE TRANSACTIONS on Communications
SP - 449
EP - 460
AU - Koji TASHIRO
AU - Kenji HOSHINO
AU - Atsushi NAGATE
PY - 2022
DO - 10.1587/transcom.2021WWP0003
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E105-B
IS - 4
JA - IEICE TRANSACTIONS on Communications
Y1 - April 2022
AB - High-altitude platform stations (HAPSs) are recognized as a promising technology for coverage extension in the sixth generation (6G) mobile communications and beyond. The purpose of this study is to develop a HAPS system with a coverage radius of 100km and high capacity by focusing on the following two aspects: array antenna structure and user selection. HAPS systems must jointly use massive multiple-input multiple-output (mMIMO) and multiuser MIMO techniques to increase their capacity. However, the coverage achieved by a conventional planar array antenna is limited to a circular area with a radius of only tens of kilometers. A conventional semi-orthogonal user selection (SUS) scheme based on the orthogonality of channel vectors achieves high capacity, but it has high complexity. First, this paper proposes a cylindrical mMIMO system to achieve an ultra-wide coverage radius of 100km and high capacity. Second, this paper presents a novel angle-based user selection (AUS) scheme, where a user selection problem is formulated as a maximization of the minimum angular difference between users over all user groups. Finally, a low-complexity suboptimal algorithm (SA) for AUS is also proposed. Assuming an area with a 100km radius, simulation results demonstrate that the proposed cylindrical mMIMO system improves the signal-to-interference-plus-noise ratio by approx. 12dB at the boundary of the area, and it achieves approx. 1.5 times higher capacity than the conventional mMIMO which uses a planar array antenna. In addition, the results show that the proposed AUS scheme improves the lower percentiles in the system capacity distribution compared with SUS and basic random user selection. Furthermore, the computational complexity of the proposed SA is in the order of only 1/4000 that of SUS.
ER -