Title: Experimental Analysis of Multipath Characteristics in Indoor Distributed Massive MIMO Channels Show Chinese title

Title: 室内分布式大规模MIMO信道多径特性实验分析

Abstract: Distributed massive multiple-input multiple-output (MIMO), also known as cell-free massive MIMO, has emerged as a promising technology for sixth-generation (6G) wireless networks. This letter introduces an indoor channel measurement campaign designed to explore the behavior of multipath components (MPCs) in distributed massive MIMO channels. Fully coherent channels were measured between eight distributed uniform planar arrays (128 elements in total) and a 12-meter user equipment route. Furthermore, a method is introduced to determine the order (single- or multi-bounce) of MPC interaction by leveraging map information and MPC parameters. In addition, a Kalman filter-based framework is used for identifying the MPC interaction mechanisms (reflection or scattering/diffraction/mixed). Finally, a comprehensive MPC-level characterization is performed based on the measured channels, including the significance of the single-bounce MPCs, the spherical wavefront features, the birth-and-death processes of the MPCs, and the spatial distribution of reflections. The findings serve as a valuable reference for understanding MPC propagation behavior, which is necessary for accurate modeling of indoor distributed massive MIMO channels. Show Chinese abstract

Abstract: 分布式大规模多输入多输出（MIMO），也称为无小区大规模MIMO，已成为第六代（6G）无线网络的一种有前景的技术。 本文介绍了一项室内信道测量活动，旨在探索多径分量（MPCs）在分布式大规模MIMO信道中的行为。 在八个分布式均匀平面阵列（总共128个元素）和一条12米用户设备路径之间测量了完全相干的信道。 此外，提出了一种方法通过利用地图信息和MPC参数来确定MPC相互作用的顺序（单次或多次反射）。 另外，使用基于卡尔曼滤波器的框架来识别MPC相互作用机制（反射或散射/衍射/混合）。 最后，根据测量的信道进行了全面的MPC级别特征描述，包括单次反射MPC的重要性、球面波前特性、MPC的产生和消亡过程以及反射的空间分布。 这些发现为理解MPC传播行为提供了宝贵的参考，这对于准确建模室内分布式大规模MIMO信道是必要的。