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This paper investigates potential advantages of linear irregular sparse antenna arrays over their regular counterparts in a mm-wave line-of-sight (LOS) multiple-input multiple-output (MIMO) scenario. The comparison is based on numerical computations of MIMO eigenvalues of the corresponding channel matrices and the resulting channel capacity. Identical linear antenna arrays are assumed at the transmitter...
Presented is a method to produce a 2D reference test zone for over-the-air measurements in a random line-of-sight environment for vehicular applications. The ideal threshold receiver model is used to design the chamber array at 3 GHz for LTE/LTE-A systems. The analysis focuses on the fluctuations of the reference power measurements at a user-defined probability of detection level of bit-streams. Numerical...
In this work, we present a wideband gap waveguide planar array antenna for millimeter wave point to point communication systems. The proposed antenna is designed using ridge gap waveguide technology and the design is based on the cavity-backed slots as the core radiating elements. There exists a coupling slot in the cavity layer which allows the excitation of the radiating slot elements using ridge...
This paper presents the recent developments of gap waveguide technology and random-LOS OTA test technology. The applications on beam-steerable massive MIMO antennas and the characterization with random-LOS are emphasized.
In this paper we propose an approach to design a horizontal array antenna to reduce the uncertainty of reference measurements in Random Line-Of-Sight Over-The-Air testing in anechoic chambers. The main focus is on wireless communications testing to and from automotive vehicles. The proposed procedure allows to determine the size, the spacing and the number of elements of a horizontal array antenna...
In the present paper we study the downlink performance of a Massive Multi-User Multiple-Input Multiple-Output narrowband system in Random Line-Of-Sight scenarios. We evaluate the ergodic sum rate for the Zero-Forcing and the Matched-Filtering precoders. We consider a single-cell system comprising a base station with 100 Huygens source antenna elements and 10 users each equipped with a single dipole...
In this paper, we investigate the unwanted scattering that exists within the multipath simulator (MPS) array antennas employed in over the air (OTA) testing of mobile terminals. The impact of scattering is evaluated in terms of the measurement uncertainty of the average received power and the Ricean -factor. The maximum ratio combining diversity is investigated for a generic device under test comprising...
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