论文标题
通过无线信号传导的分布式预编码设计，用于无细胞的大规模MIMO
Distributed Precoding Design via Over-the-Air Signaling for Cell-Free Massive MIMO
论文作者
论文摘要
大多数关于无细胞大量多输入多输出（MIMO）的作品考虑基本站（BSS）的非合作预编码策略，以避免通过回程信号传导进行广泛的通道状态信息（CSI）交换。但是，可以通过允许在BSS之间进行协调来实现可观的性能增长。本文提出了第一个用于无细胞大型MIMO（通常是在关节传输协调的多点）系统中进行合作预编码设计的第一个分布式框架，该系统完全消除了CSI交换的回程信号传导的需求。引入了一种新型的空中（OTA）信号传导机制，以便每个BS可以通过回程信号传统在BSS之间获得相同的跨期信息。所提出的分布式预码设计具有理想的灵活性和可扩展性属性，因为OTA信号的量与BSS或用户设备的数量不扩展。与非合作预编码设计相比，数值结果显示出快速的收敛性和显着的性能增长。在现实的CSI采集下，提出的计划还可以胜过集中的预码设计。
Most works on cell-free massive multiple-input multiple-output (MIMO) consider non-cooperative precoding strategies at the base stations (BSs) to avoid extensive channel state information (CSI) exchange via backhaul signaling. However, considerable performance gains can be accomplished by allowing coordination among the BSs. This paper proposes the first distributed framework for cooperative precoding design in cell-free massive MIMO (and, more generally, in joint transmission coordinated multi-point) systems that entirely eliminates the need for backhaul signaling for CSI exchange. A novel over-the-air (OTA) signaling mechanism is introduced such that each BS can obtain the same cross-term information that is traditionally exchanged among the BSs via backhaul signaling. The proposed distributed precoding design enjoys desirable flexibility and scalability properties, as the amount of OTA signaling does not scale with the number of BSs or user equipments. Numerical results show fast convergence and remarkable performance gains as compared with non-cooperative precoding design. The proposed scheme can also outperform the centralized precoding design under realistic CSI acquisition.
