Per-Antenna Power Distribution of a Zero-Forcing Beamformed ULA in pure LOS MU-MIMO
Artikel i vetenskaplig tidskrift, 2018

An analytical model is presented to determine the per-antenna power distribution of a beamformed M-element uniform linear array (ULA) as a base station antenna (BSA). The analysis assumes a single sector cell serving two user equipments (UEs) in a downlink multiuser multiple-input multiple-output (MU-MIMO) system employing zeroforcing (ZF) transmission. Determinative design parameters of the BSA configuration are identified. Afterwards, their effects on the power spread across the array are investigated when the positions of the users are random and they are uniformly distributed over the cell. It is shown that the power distribution across the ULA antenna aperture is a periodic function whose characteristics mainly depend on the angular separation of two UEs and the number of BSA elements. A significant variation between ULA input powers is seen to occur if the number of elements in the ULA is smaller than one period of this power distribution function. In order to mitigate the dynamic range of the power variation across the array, an upper bound for the inter-element spacing, depending on the field-of-view (FoV) of the BSA, is defined. It is shown that, in a 20-element ULA, increasing the inter-element spacing from 0.5-wavelength to 1.4-wavelength reduces the power variation from 19 dB to 10 dB for differentiating two close-by UEs with 1 degree angular separation.



massive MIMO

base station antenna


uniform linear array


Navid Amani

Chalmers, Elektroteknik, Kommunikation, Antenner och Optiska Nätverk

Andres Alayon Glazunov

Universiteit Twente

Chalmers, Elektroteknik, Kommunikation, Antenner och Optiska Nätverk

Marianna Ivashina

Chalmers, Elektroteknik, Kommunikation, Antenner och Optiska Nätverk

Rob Maaskant

Chalmers, Elektroteknik, Kommunikation, Antenner och Optiska Nätverk

Technische Universiteit Eindhoven

IEEE Communications Letters

1089-7798 (ISSN) 15582558 (eISSN)

Vol. 22 12 2515-2518 8470947

Silicon-based Ka-band massive MIMO antenna systems for new telecommunication services (SILIKA)

Europeiska kommissionen (EU) (EC/H2020/721732), 2016-09-01 -- 2020-08-31.


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