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- W4313303814 abstract "Existing works on cell-free systems consider either coherent or non-coherent downlink data transmission and a network deployment with a single central processing unit (CPU). While it is known that coherent transmission outperforms noncoherent transmission when assuming unlimited fronthaul links, the former requires a perfect timing synchronization, which is practically not viable over a large network. Furthermore, relying on a single CPU for geographically large cell-free networks is not scalable. Thus, to realize the expected gains of cellfree systems in practice, alternative transmission strategies for realistic multi-CPU cell-free systems are required. Therefore, this paper proposes a novel downlink data transmission scheme that combines and generalizes the existing coherent and non-coherent transmissions. The proposed transmission scheme, named mixed transmission, works based on the realistic assumption that only the access points (APs) controlled by a same CPU are synchronized, and thus transmit in a coherent fashion, while APs from different CPUs require no synchronism and transmit in a non-coherent manner. We also propose extensions of existing clustering algorithms for multi-CPU cell-free systems with mixed transmission. Simulation results show that the combination of the proposed clustering algorithms with mixed transmission have the potential to perform close to the ideal coherent transmission." @default.
- W4313303814 created "2023-01-06" @default.
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- W4313303814 date "2022-12-28" @default.
- W4313303814 modified "2023-09-23" @default.
- W4313303814 title "Mixed Coherent and Non-Coherent Transmission for Multi-CPU Cell-Free Systems" @default.
- W4313303814 doi "https://doi.org/10.48550/arxiv.2212.13950" @default.
- W4313303814 hasPublicationYear "2022" @default.
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