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학술대회 Joint Centralized and Distributed Precoding in Scalable Cell-Free Massive MIMO Systems
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김민현, 최인경, 홍승은, 나지현
International Conference on Information and Communication Technology Convergence (ICTC) 2022, pp.1254-1257
22HH1700, [통합과제] 5G NR 기반 지능형 오픈 스몰셀 기술 개발, 나지현
We consider the precoding design for scalable cell-free massive multiple-input multiple-output (MIMO) systems. In-spired by the adaptable trade-off between the spectral efficiency and centralization overhead, we propose a joint centralized and distributed (JCD) precoding scheme. In the proposed precoding, only parts of the access points (APs) are collaborated to apply centralized precoding through the central processing unit (CPU) while the rest of the APs perform distributed precoding using local channel state information (CSI) to reduce the fronthaul signaling overhead and computational complexity. We adopt the partial minimum mean square error (P-MMSE) and local P-MMSE (LP-MMSE) for centralized and distributed precodings, respectively. In addition, simple AP selection and heuristic power allocation based on the large-scale parameter are also presented. It is demonstrated through the system-level simulation that the proposed J CD precoding significantly outperforms the existing local precodings, such as LP-MMSE and maximum-ratio (MR), even if a small number of APs are centralized.
KSP 제안 키워드
AP selection, Access point, Channel State Information(CSI), Computational complexity, Distributed precoding, Massive MIMO system, Massive multiple-input multiple-output (MIMO) systems, Minimum Mean Square Error(MMSE), Precoding design, Scale parameters, Spectral efficiency(SE)