We propose a distributed precoding design for downlink cell-free massive multiple-input multiple-output (MIMO) systems where the channel state information (CSI) exchange via backhaul signaling is entirely replaced by a novel over-the- air (OTA) signaling mechanism. The proposed method enjoys desirable flexibility and scalability properties, as the amount of OTA signaling does not scale with the number of base stations or user equipments. Numerical results show remarkable gains over uncoordinated precoding design, even after very few iterations. The proposed method may also outperform the centralized precoding design under realistic CSI acquisition.
Gouda Bikshapathi, Atzeni Italo, Tölli Antti
A4 Article in conference proceedings
Place of publication:
21st IEEE International Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2020
B. Gouda, I. Atzeni and A. Tölli, “Distributed Precoding Design for Cell-Free Massive MIMO Systems,” 2020 IEEE 21st International Workshop on Signal Processing Advances in Wireless Communications (SPAWC), Atlanta, GA, USA, 2020, pp. 1-5, doi: 10.1109/SPAWC48557.2020.9154279
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