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

Abstract:

In this work, an indoor ultra-dense massive MIMO experiment is analysed to quantity 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.