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
MIMO besar-besaran bebas sel (CF-mMIMO), yang menggunakan sebilangan besar antena yang digunakan secara bekerjasama di kawasan komunikasi, telah menarik perhatian besar sebagai teknologi penting untuk merealisasikan sistem 5G-maju dan 6G. Baru-baru ini, untuk memastikan kebolehskalaan sistem dan mengurangkan gangguan antara pengguna dalam CF-mMIMO, pendekatan berpusatkan pengguna (UC) telah disiasat. Dalam pendekatan UC ini, set antena berpusatkan pengguna dibentuk dengan memilih antena yang sesuai untuk setiap pengguna, dan poskod digunakan untuk mengurangkan gangguan kuat daripada pengguna yang set antenanya bertindih. Walau bagaimanapun, dalam persekitaran kepadatan pengguna yang sangat tinggi, memandangkan bilangan pengguna yang mengganggu meningkat disebabkan peningkatan pertindihan set antena, kapasiti pautan yang boleh dicapai mungkin merosot. Dalam kertas kerja ini, kami mencadangkan pendekatan berpusatkan pengguna (UCC), yang mengumpulkan pengguna kejiranan ke dalam kelompok pengguna dan mengaitkan bilangan antena yang telah ditetapkan kepada kelompok pengguna ini untuk pemultipleksan ruang. Kami memperoleh berat poskod pautan atas dan menerangkan keberkesanan pendekatan UCC yang dicadangkan dari segi kerumitan pengiraan pengiraan berat. Kami juga membandingkan kapasiti pengguna pautan atas yang boleh dicapai dengan pendekatan UC dan UCC melalui simulasi komputer dan menjelaskan situasi di mana pendekatan UCC berkesan. Tambahan pula, kami membincangkan kesan bilangan pengguna yang mengganggu yang dipertimbangkan dalam pengiraan berat poskod ralat min kuasa dua sifar dan minimum terhadap kapasiti pengguna.
Ryo TAKAHASHI
Tohoku University
Hidenori MATSUO
Tohoku University
Sijie XIA
Tohoku University
Qiang CHEN
Tohoku University
Fumiyuki ADACHI
Tohoku University
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Salinan
Ryo TAKAHASHI, Hidenori MATSUO, Sijie XIA, Qiang CHEN, Fumiyuki ADACHI, "Uplink Postcoding in User-Cluster-Centric Cell-Free Massive MIMO" in IEICE TRANSACTIONS on Communications,
vol. E106-B, no. 9, pp. 748-757, September 2023, doi: 10.1587/transcom.2022FGT0001.
Abstract: Cell-free massive MIMO (CF-mMIMO), which cooperatively utilizes a large number of antennas deployed over a communication area, has been attracting great attention as an important technology for realizing 5G-advanced and 6G systems. Recently, to ensure system scalability and mitigate inter-user interference in CF-mMIMO, a user-centric (UC) approach was investigated. In this UC approach, user-centric antenna-sets are formed by selecting appropriate antennas for each user, and postcoding is applied to reduce the strong interference from users whose antenna-sets overlap. However, in very high user density environments, since the number of interfering users increases due to increased overlapping of antenna-sets, the achievable link capacity may degrade. In this paper, we propose a user-cluster-centric (UCC) approach, which groups neighborhood users into a user-cluster and associates the predetermined number of antennas to this user-cluster for spatial multiplexing. We derive the uplink postcoding weights and explain the effectiveness of the proposed UCC approach in terms of the computational complexity of the weight computation. We also compare the uplink user capacities achievable with UC and UCC approaches by computer simulation and clarify situations where the UCC approach is effective. Furthermore, we discuss the impact of the number of interfering users considered in the zero-forcing and minimum mean square error postcoding weight computation on the user capacity.
URL: https://global.ieice.org/en_transactions/communications/10.1587/transcom.2022FGT0001/_p
Salinan
@ARTICLE{e106-b_9_748,
author={Ryo TAKAHASHI, Hidenori MATSUO, Sijie XIA, Qiang CHEN, Fumiyuki ADACHI, },
journal={IEICE TRANSACTIONS on Communications},
title={Uplink Postcoding in User-Cluster-Centric Cell-Free Massive MIMO},
year={2023},
volume={E106-B},
number={9},
pages={748-757},
abstract={Cell-free massive MIMO (CF-mMIMO), which cooperatively utilizes a large number of antennas deployed over a communication area, has been attracting great attention as an important technology for realizing 5G-advanced and 6G systems. Recently, to ensure system scalability and mitigate inter-user interference in CF-mMIMO, a user-centric (UC) approach was investigated. In this UC approach, user-centric antenna-sets are formed by selecting appropriate antennas for each user, and postcoding is applied to reduce the strong interference from users whose antenna-sets overlap. However, in very high user density environments, since the number of interfering users increases due to increased overlapping of antenna-sets, the achievable link capacity may degrade. In this paper, we propose a user-cluster-centric (UCC) approach, which groups neighborhood users into a user-cluster and associates the predetermined number of antennas to this user-cluster for spatial multiplexing. We derive the uplink postcoding weights and explain the effectiveness of the proposed UCC approach in terms of the computational complexity of the weight computation. We also compare the uplink user capacities achievable with UC and UCC approaches by computer simulation and clarify situations where the UCC approach is effective. Furthermore, we discuss the impact of the number of interfering users considered in the zero-forcing and minimum mean square error postcoding weight computation on the user capacity.},
keywords={},
doi={10.1587/transcom.2022FGT0001},
ISSN={1745-1345},
month={September},}
Salinan
TY - JOUR
TI - Uplink Postcoding in User-Cluster-Centric Cell-Free Massive MIMO
T2 - IEICE TRANSACTIONS on Communications
SP - 748
EP - 757
AU - Ryo TAKAHASHI
AU - Hidenori MATSUO
AU - Sijie XIA
AU - Qiang CHEN
AU - Fumiyuki ADACHI
PY - 2023
DO - 10.1587/transcom.2022FGT0001
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E106-B
IS - 9
JA - IEICE TRANSACTIONS on Communications
Y1 - September 2023
AB - Cell-free massive MIMO (CF-mMIMO), which cooperatively utilizes a large number of antennas deployed over a communication area, has been attracting great attention as an important technology for realizing 5G-advanced and 6G systems. Recently, to ensure system scalability and mitigate inter-user interference in CF-mMIMO, a user-centric (UC) approach was investigated. In this UC approach, user-centric antenna-sets are formed by selecting appropriate antennas for each user, and postcoding is applied to reduce the strong interference from users whose antenna-sets overlap. However, in very high user density environments, since the number of interfering users increases due to increased overlapping of antenna-sets, the achievable link capacity may degrade. In this paper, we propose a user-cluster-centric (UCC) approach, which groups neighborhood users into a user-cluster and associates the predetermined number of antennas to this user-cluster for spatial multiplexing. We derive the uplink postcoding weights and explain the effectiveness of the proposed UCC approach in terms of the computational complexity of the weight computation. We also compare the uplink user capacities achievable with UC and UCC approaches by computer simulation and clarify situations where the UCC approach is effective. Furthermore, we discuss the impact of the number of interfering users considered in the zero-forcing and minimum mean square error postcoding weight computation on the user capacity.
ER -