User Correlation Using Rotating Planar Antenna Arrays for Line-of-Sight Massive Multiple Input Multiple Output

Authors

  • G. C. Eze Department of Electronic and Electrical Engineering, Federal Polytechnic, Oko, Anambra State, Nigeria.
  • M. A. Ahaneku Department of Electronic and Computer Engineering, University of Nigeria, Nsukka, Enugu State, Nigeria.
  • V. C. Chijindu Department of Electronic and Computer Engineering, University of Nigeria, Nsukka, Enugu State, Nigeria.

DOI:

https://doi.org/10.63746/njtd.v22i3.3668

Keywords:

Array antenna rotation, inter-user correlation, LoS, massive MIMO, collinear channel

Abstract

This work investigates an array antenna rotation (AAR) technique in order to minimize inter-user correlation for massive multiple-input-multiple-output (MIMO) in pure line-of-sight (LoS) environment. Traditional planar arrays have better signal separation performance than linear arrays and can create three dimensional beams. However, when the angular separation of some signals between the users from/to the base station (BS) are small, the interference suppression (i.e., signal separation) performance degenerates since the projection points onto horizontal and vertical axes of several antenna elements overlap and spatial resolution along each axis is degraded. The aim is to improve inter-user correlation performance via mechanical rotation angle optimization. We propose a recursive bisection algorithm for rotation angle optimization by finding the optimal antenna rotation angle. Simulation results show in particular that the rotation of antenna body at the BS has inter-user correlation impact on large number of antennas in both horizontal and vertical resolutions. The 5th percentile inter-user correlation values of , , ,  and  AAR configurations are 0.96, 0.86, 0.53, 0.03, and 0.00, respectively. This means that inter-user correlation increases with decrease in number of antennas and can be achieved in practice. Finally, the spatial decorrelation of AAR is superior compared to parallelogram planar array (PPA) and uniform planar array (UPA) because of mechanical rotation of antenna body.

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Published

2025-07-17

Issue

Vol. 22 No. 3 (2025): Vol. 22, Issue 3, June 2025

Section

Articles

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