On the Impact of Antenna Array Geometry on Indoor Wideband Massive MIMO Networks

Murat Temiz, Emad Alsusa, Yongwei Zhang, Laith Danoon

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Abstract

Multi-user massive multiple-input-multiple-output (massive MIMO) will play a key role in future wireless communication networks. While spatial channel diversity is fundamental merit of this technique, high channel correlation may significantly restrict its abilities. This study investigates the impact of channel correlation on a prototyped massive MIMO network with the objective to identify an antenna array geometry which has reduced mutual coupling and channel correlation. To this end, a highly-efficient directional wideband single antenna element was designed for the antenna arrays and the user equipments (UEs). The designed array geometry is tested in an experimental indoor wideband massive MIMO setup. Important systems parameters such as channel correlation, power delay profile and average received power from the UEs are studied by analyzing the measured channel data. Furthermore, system-level simulations and network capacity calculations are performed based on the measured channel data to evaluate the performance of the prototyped antenna arrays. For benchmarking-sake, a regular array was also fabricated and used for comparison. Moreover, a power control algorithm is introduced for the uplink, which could improve the network capacity by up to 3 dB. The results show that the introduced antenna array geometry outperforms the uniform antenna array in terms of mutual coupling and channel capacity.
Original languageEnglish
JournalIEEE Transactions on Antennas and Propagation
Early online date16 Jul 2020
DOIs
Publication statusE-pub ahead of print - 16 Jul 2020

Keywords

  • Massive MIMO
  • Antenna array geometry
  • Channel correlation
  • Mutual Coupling

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