Massive MIMO: A Measurement-Based Analysis of MR Power Distribution

Abstract

In this work, an indoor ultra-dense massive MIMO experiment is analysed to quantify the interference power that affects undesired users or victims when MR precoding is applied. To compare scenarios resulting in different favourable propagation conditions between users, the antennas are deployed as a Uniform Rectangular Array (URA), a Uniform Linear Array (ULA) and a Distributed Uniform Linear Array (D-ULA). We study scenarios where multiple users are served simultaneously. At the same time, the ultra-dense set of possible user locations is sub-sampled on a grid with a variable distance between users ranging from 50mm to 600mm. This work shows, on the one hand, that a URA antenna configuration provides the highest power to victim users and the worst power distribution towards target users. On the other hand, due to improved favourable propagation conditions for many user location pairs, the D-ULA topology reduces the power to victim users. Moreover, it guarantees that the power received by the target user will always be at least 3dB higher than any other victim user even if the users are closer as 100mm, for our analysis based on an indoor data-set and up to three target users.

A Theoretical Analysis of Favorable Propagation on Massive MIMO Channels with Generalized Angle Distributions

“…Rayleigh channels against antenna numbers in the practical scenario. The distance is calculated by (28). It can be seen that the distance from FP becomes smaller, and the capacity ratio rises with the antenna number increasing.…”

“…Rayleigh channels are analyzed in massive MIMO measurements with 128 antenna elements [26,27]. Moreover, measurements in an indoor ultra-dense scenario show that a distributed ULA topology is easier to satisfy the FP condition for multiple serving users [28].…”

Internet of Things Networks: Enabling Simultaneous Wireless Information and Power Transfer

“…For this reason, BSs are evolving toward massive MIMO architectures, meaning that a large number of antennas are deployed. Those antennas can be allocated in a centralized or distributed manner [25,26]. In communications, the power leakage in space can lead to interference when users are active in those areas.…”

“…A more extensive measurement campaign was conducted at KU Leuven [26,32,33]. An automated massive MIMO experiment analyzed three-antenna configurations and the corresponding leakage power impact in an indoor scenario.…”

Densely Deployed Indoor Massive MIMO Experiment: From Small Cells to Spectrum Sharing to Cooperation

“…In reality, the number of antennas is limited. To maximise coverage and favourable propagation conditions, while minimising the impact of shadowing, distributing the antennas over the targeted area is meaningful [ 2 , 3 , 4 , 5 , 6 , 7 , 8 ]. When multiple distributed antennas are processed jointly and coherently, we call this a distributed massive MIMO system.…”