Adaptive Interference Suppressing Multi-User ZF in Cluster-Centric Cell-Free Massive MIMO Systems

被引：1

作者：

Xia, Sijie ^{[1
]}

Ge, Chang ^{[1
]}

Takahashi, Ryo ^{[2
]}

Chen, Qiang ^{[1
]}

Adachi, Fumiyuki ^{[3
]}

机构：

[1] Tohoku Univ, Sch Engn, Sendai 9808579, Japan

[2] Panason Syst Networks Res & Dev Lab Co Ltd, Sendai 9813206, Japan

[3] Tohoku Univ, Int Res Inst Disaster Sci, Sendai 9808572, Japan

来源：

IEEE COMMUNICATIONS LETTERS | 2024年 / 28卷 / 06期

关键词：

Antennas; Interference; Vectors; Uplink; Signal to noise ratio; Channel estimation; Antenna arrays; Cell-free massive MIMO; user-clustering; zero-forcing; interference suppression;

D O I：

10.1109/LCOMM.2024.3384670

中图分类号：

TN [电子技术、通信技术];

学科分类号：

0809 ;

摘要：

In this letter, a cluster-centric (CC)-based cell-free massive multiple-input multiple-output (CF-mMIMO) system is considered, which realizes multi-user multiplexing in each user-cluster formed by neighboring users and served by surrounding antennas. Then, the interference suppressing multi-user zero-forcing (IS-MU-ZF) is considered to further eliminate the inter-cluster interference. But the IS-MU-ZF faces a capacity drop problem. Thus, an adaptive interfering user selection method is proposed to flexibly determine the set of interfering users for each user-cluster. It is confirmed by computer simulation that the proposed CC-based CF-mMIMO system utilizing the IS-MU-ZF with the proposed adaptive interfering user selection method outperforms the well-known user-centric (UC)-based CF-mMIMO system in terms of capacity and computational complexity when the accuracy of channel estimation is guaranteed.

引用

页码：1422 / 1426

页数：5

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