MIMO Over-The-Air Research, Development, and Testing

Rumney, Moray; Pirkl, Ryan J.; Landmann, Markus; Sánchez‐Hernández, D.

doi:10.1155/2012/467695

Cited by 50 publications

(31 citation statements)

References 126 publications

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“…The reason to choose the frequency band 5.850 GHz to 5.925 GHz is that this is the frequency band that 802.11p modems normally operate at. As mentioned earlier, the disturbance level in the test zone is the sum of the received powers according to (4), the results of which are seen in the same table. These values are all very low, which is logical considering there are only eight highly directional TX antennas.…”

Section: B Results and Analysismentioning

confidence: 67%

“…Therefore, to reduce the need of measurement campaigns when measuring the performance of cellular devices, the telecom industry has adopted Over-the-Air (OTA) testing [4] using reverberation chambers [5]- [7], OTA multiprobe testing [8]- [11], and verification by the two stage method [12]. The research area of OTA multi-probe testing for cellular devices is very active today.…”

Section: Introductionmentioning

confidence: 99%

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Measurement Uncertainty, Channel Simulation, and Disturbance Characterization of an Over-the-Air Multiprobe Setup for Cars at 5.9 GHz

Nilsson

Hallbjörner

Arabäck

et al. 2015

IEEE Trans. Ind. Electron.

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Abstract-Over-the-air multi-probe setups provide an efficient way to characterize the performance of today's advanced wireless communication systems. In this paper the measurement uncertainty of such a setup using a car as a test object is characterized through three experiments: measurement system analysis, channel sounder measurements, and probe coupling measurements. Four issues were in focus for the analysis; precision, realization of the wireless communication channel, coupling between the probes, and the influence of the test object size. The analysis shows that a large test object such as a car in an over-the-air multi-probe ring will affect the measurement uncertainty, but only to a small degree. The measurement uncertainty expressed as expanded uncertainty was below +/-1dB, a level that would not violate best practice total uncertainty levels for comparable over-the-air methods.

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Section: B Results and Analysismentioning

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Measurement Uncertainty, Channel Simulation, and Disturbance Characterization of an Over-the-Air Multiprobe Setup for Cars at 5.9 GHz

Nilsson

Hallbjörner

Arabäck

et al. 2015

IEEE Trans. Ind. Electron.

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show abstract

“…Furthermore, with our proposed calibration, the BS does not need any additional hardware circuit which can reduce the cost of the BS compared to that in [23] and [24]. Some other references about over-the-air calibration for the antenna system can be found in [25]- [27]. The impact of DCT hardware impairments on massive MIMO systems is firstly analyzed, in particular, DC offset and frequency dependent (FD) I/Q imbalance.…”

Section: Introductionmentioning

confidence: 99%

A Closed-Loop Reciprocity Calibration Method for Massive MIMO in Terrestrial Broadcasting Systems

Luo

Zhang

Huang

et al. 2017

IEEE Trans. on Broadcast.

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Abstract-Massive multi-input multioutput (MIMO) is believed to be an effective technique for future terrestrial broadcasting systems. Reciprocity calibration is one of the major practical challenges for massive MIMO systems operating in time-division duplexing mode. A new closed-loop reciprocity calibration method is investigated in this paper which can support online calibration with a higher accuracy compared to the existing methods. In the first part of the proposed method, an optimized relative calibration is introduced using the same structure of traditional relative calibration, but with less impaired hardware in the reference radio chain. In the second part, a test device (TD)-based calibration is proposed which makes online calibration possible. An experiment setup is built for the measurement of the base station hardware impairments and TD-based calibration implementation. Simulation results and the error vector magnitude of UE received signal after calibration show that the performance of our proposed method is improved significantly compared to the existing relative calibration methods.

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“…In this regard, traditional device test measurement procedures such as the conducted measurement test are not able to cover the spatial dimension of the propagation channel as the air interface is bridged by cables towards the device tester. To cope with that issue, the two-stage conducted testing approach that includes the effects of the propagation channel and the antenna radiation pattern was developed, see [3]. However, a drawback of this procedure is the inaccessibility of small and compact antennas in integrated devices, as it is not always possible to access the antenna ports without destroying the device under test (DUT), or at least significantly altering its electromagnetic properties.…”

Section: Introductionmentioning

confidence: 99%

Setup and verification of a multi-GNSS over-the-air wave field synthesis testbed

Rügamer

Schirmer

Lorenz

et al. 2016

2016 IEEE/ION Position, Location and Navigation Symposium (PLANS)

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In this paper, we describe the principle, hardware/software setup, calibration and verification measurement results of a wave field synthesis (WFS) over-the-air (OTA) testbed for global navigation satellite systems (GNSS). It represents a new approach that, in contrast to conventionally conducted and open-field tests, realistically emulates real world scenarios under controllable and repeatable conditions. This enables the realistic comparison of receivers and algorithms especially for multi/beamforming antenna receivers as well as for receivers with integrated antennas. Having outlined the architecture and hardware setup of the WFS OTA testbed together with the GNSS constellation simulator, we describe the current 2D setup and the upcoming 3D installation

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MIMO Over-The-Air Research, Development, and Testing

Cited by 50 publications

References 126 publications

Measurement Uncertainty, Channel Simulation, and Disturbance Characterization of an Over-the-Air Multiprobe Setup for Cars at 5.9 GHz

Measurement Uncertainty, Channel Simulation, and Disturbance Characterization of an Over-the-Air Multiprobe Setup for Cars at 5.9 GHz

A Closed-Loop Reciprocity Calibration Method for Massive MIMO in Terrestrial Broadcasting Systems

Setup and verification of a multi-GNSS over-the-air wave field synthesis testbed

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