Uniform Linear Arrays With Optimized Inter-Element Spacing for LOS Massive MIMO
Journal article, 2021

In this letter, a uniform linear array (ULA) is proposed for line-of-sight massive multiple-input-multiple-output (MIMO). It is assumed that the number of antennas is fixed. For a given ULA with an arbitrary inter-element spacing, the probability that the correlation among the channel vectors of two users being above a threshold value is derived. The inter-element spacing of the proposed ULA is the one for which the aforementioned probability is minimized. To show the effectiveness of the proposed ULA, simulation results for two scenarios are given for a 64-antenna ULA that serves 6 single-antenna users. By using the proposed ULA instead of conventional half-wavelength ULA, 5th percentile sum-rate for zero-forcing precoder is improved by 9.90 bits/channel use in first scenario without dropping, and by 1.43 bits/channel use in second scenario with dropping 1 user.


massive MIMO



Power control

uniform linear array



MIMO communication

Antenna arrays


Amirashkan Farsaei

Eindhoven University of Technology

Navid Amani

Chalmers, Electrical Engineering, Communication, Antennas and Optical Networks

Rob Maaskant

Chalmers, Electrical Engineering, Communication, Antennas and Optical Networks

Ulf Gustavsson


Alex Alvarado

Eindhoven University of Technology

Frans M. J. Willems

Eindhoven University of Technology

IEEE Communications Letters

1089-7798 (ISSN)

Vol. 25 2 613-616 9222215

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

European Commission (EC) (EC/H2020/721732), 2016-09-01 -- 2020-08-31.

Subject Categories


Communication Systems

Signal Processing



More information

Latest update

4/5/2022 7