2020/04/01 by Italo Atzeni, Atzeni, Italo, Bikshapathi Gouda +3 · 1 citation
Computer Science · Engineering · #Advanced MIMO Systems Optimization #Advanced Wireless Communication Technologies #Cooperative Communication and Network Coding #FOS: Computer and information sciences #FOS: Electrical engineering #Information Theory (cs.IT) #Signal Processing (eess.SP) #electronic engineering #information engineering
paper · pdf · doi:10.48550/arxiv.2004.00299
openalex publication_date 2020/04/01 · openalex created_date 2022/07/26 · openalex updated_date 2026/07/28
Most works on cell-free massive multiple-input multiple-output (MIMO)\nconsider non-cooperative precoding strategies at the base stations (BSs) to\navoid extensive channel state information (CSI) exchange via backhaul\nsignaling. However, considerable performance gains can be accomplished by\nallowing coordination among the BSs. This paper proposes the first distributed\nframework for cooperative precoding design in cell-free massive MIMO (and, more\ngenerally, in joint transmission coordinated multi-point) systems that entirely\neliminates the need for backhaul signaling for CSI exchange. A novel\nover-the-air (OTA) signaling mechanism is introduced such that each BS can\nobtain the same cross-term information that is traditionally exchanged among\nthe BSs via backhaul signaling. The proposed distributed precoding design\nenjoys desirable flexibility and scalability properties, as the amount of OTA\nsignaling does not scale with the number of BSs or user equipments. Numerical\nresults show fast convergence and remarkable performance gains as compared with\nnon-cooperative precoding design. The proposed scheme can also outperform the\ncentralized precoding design under realistic CSI acquisition.\n