Abstract
This paper presents an over-the-air testing method in which a full-rank channel matrix is created for a massive multiple-input multiple-output (MIMO) antenna system utilizing a fading emulator with a small number of scatterers. In the proposed method, in order to mimic a fading emulator with a large number of scatterers, the scatterers are virtually positioned by rotating the massive MIMO antenna. The performance of a 64-element quasi-half-wavelength dipole circular array antenna was evaluated using a two-dimensional fading emulator. The experimental results reveal that a large number of available eigenvalues are obtained from the channel response matrix, confirming that the proposed method, which utilizes a full-rank channel matrix, can be used to assess a massive MIMO antenna system.
Highlights
Global commercial services for ultra-high speed fifth-generation (5G) mobile communication using multiple-input multiple-output (MIMO) systems are currently available [1,2].One of the possible solutions to significantly enhance the channel capacity of MIMO systems is to utilize a large number of antenna elements for both the base station (BS) and the mobile station (MS)
The channel capacity measured is created for a◦ massive MIMO MS antenna utilizing a fading emulator with a small numat ∆φ = 5.1 achieves 97% of the analytical outcome; indicating that the observed result ber of scatterers
Which is rotated; the total number of scatterers can be determined by controlling the rotaof 30 dB, which is equivalent to 45 Gbps with a bandwidth of 100 MHz, is fully satisfied, tion of the massive MIMO antenna
Summary
One of the possible solutions to significantly enhance the channel capacity of MIMO systems is to utilize a large number of antenna elements for both the base station (BS) and the mobile station (MS). Such a system is called a massive MIMO system [3]. The usual technique for evaluating the performance of MIMO antennas with multipath fading channels is to do Monte Carlo simulation where several scatterers are placed on a circle [8,9] This is known as the Clarke model or ring model. The number of scatterers required to simulate the full-rank property of the channel matrix for a massive
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