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
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
收藏
页码:1422 / 1426
页数:5
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