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Statistics Approximation-Enabled Distributed Beamforming for Cell-Free Massive MIMO
KTH, School of Electrical Engineering and Computer Science (EECS), Communication Systems. KTH, School of Electrical Engineering and Computer Science (EECS), Centres, Digital futures.ORCID iD: 0000-0001-5745-7640
KTH, School of Electrical Engineering and Computer Science (EECS), Communication Systems. KTH, School of Electrical Engineering and Computer Science (EECS), Centres, Digital futures.ORCID iD: 0000-0002-5954-434X
Beijing Jiaotong University, Beijing, China.
KTH, School of Electrical Engineering and Computer Science (EECS), Communication Systems. KTH, School of Electrical Engineering and Computer Science (EECS), Centres, Digital futures.ORCID iD: 0000-0002-4459-3413
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2026 (English)In: ICC 2026 - IEEE International Conference on Communications, Proceedings, Institute of Electrical and Electronics Engineers (IEEE) , 2026Conference paper, Published paper (Refereed)
Abstract [en]

We study a distributed beamforming approach for cell-free massive multiple-input multiple-output networks, referred to as Global Statistics & Local Instantaneous information-based minimum mean-square error (GSLI-MMSE). The scenario with multi-antenna access points (APs) is considered over three different channel models: correlated Rician fading with fixed or random line-of-sight (LoS) phase-shifts, and correlated Rayleigh fading. With the aid of matrix inversion derivations, we can construct the conventional MMSE combining from the perspective of each AP, where global instantaneous information is involved. Then, for an arbitrary AP, we apply the statistics approximation methodology to approximate instantaneous terms related to other APs by channel statistics to construct the distributed combining scheme at each AP with local instantaneous information and global statistics. With the aid of uplink-downlink duality, we derive the respective GSLI-MMSE precoding schemes. Numerical results showcase that the proposed GSLI-MMSE scheme demonstrates performance comparable to the optimal centralized MMSE scheme, under the stable LoS conditions, e.g., with static users having Rician fading with a fixed LoS path.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE) , 2026.
National Category
Telecommunications Signal Processing
Identifiers
URN: urn:nbn:se:kth:diva-386491DOI: 10.1109/ICC59461.2026.11588270Scopus ID: 2-s2.0-105045348590OAI: oai:DiVA.org:kth-386491DiVA, id: diva2:2089968
Conference
2026 IEEE International Conference on Communications, ICC 2026, Glasgow, United Kingdom, May 24-28 2026
Note

Part of ISBN 979-8-3195-4209-0

QC 20260805

Available from: 2026-08-05 Created: 2026-08-05 Last updated: 2026-08-05Bibliographically approved

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Wang, ZheBjörnson, EmilZhang, PengPetrov, Vitaly

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