Configuration and Control of a Millimeter-Wave Synthetic Aperture Measurement System with Uncertainties

Weiss, Alec; Quimby, Jeanne; Leonhardt, Rod; Jamroz, Ben; Williams, Dylan F.; Remley, Kate A.; Vouras, Peter; Elsherbeni, Atef Z.

doi:10.1109/arftg47271.2020.9241381

Cited by 11 publications

(10 citation statements)

References 12 publications

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“…We also apply the sparse-DSM to experimentally-measured data in 6.2. The measurement, which is described in more detail in that section and in [59], allows for AOA estimation in a realistic situation. It was collected by staff in the Communications Technology Laboratory at the National Institute of Standards and Technology.…”

Section: Computational Resultsmentioning

confidence: 99%

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A sparsity-constrained sampling method with applications to communications and inverse scattering

Harris¹,

Rezac²

2020

Preprint

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We introduce the sparse direct sampling method (DSM) to estimate properties of a region from signals that probe the region. We demonstrate the sparse-DSM on two separate problems: estimating both the angle-of-arrival of a radio wave impinging on an array and the location and shape of an inhomogeneity from scattered acoustic waves. The sparse-DSM is qualitative in nature, so it does not require the simulation of a forward problem to solve the inverse problem. The method generalizes of two older qualitative methods, one which has low-resolution reconstructions but uses few measurements and one which is high-resolution but has higher measurement cost. The sparse-DSM inherits positive qualities from both. We demonstrate the technique on measured and simulated examples.

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Section: Computational Resultsmentioning

confidence: 99%

“…The measurement data consisted of 1225 spatial measurement locations each with 1350 time steps. Full details on the experimental procedure are given in [59]. True AOAs were not known for this dataset, so we compare our techniques to the results of the MUSIC algorithm.…”

Section: Reconstructions For Aoa Estimation With Measured Datamentioning

confidence: 99%

A sparsity-constrained sampling method with applications to communications and inverse scattering

Harris¹,

Rezac²

2020

Preprint

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“…For the work presented here, the synthetic-aperture system includes a fixed transmit antenna, a precise positioner consisting of a robotic arm that moves the receive antenna, and measurement equipment to transmit and receive RF waveforms as shown in Fig. 6 [30]. The use of this robotic arm provides position accuracy below 100 µm as determined by an optical camera system that estimates the actual positions of the robot.…”

Section: Samurai Hardware Descriptionmentioning

confidence: 99%

“…Figure6: System block diagram including the receive (Rx) antenna mounted on the scanning robotic arm; the fixed horn transmit (Tx) antenna; and a multiple-camera system for tracking the position of the Rx antenna and objects in the channel. A custom Python code controls the robot and the LSNA [30]. …”

mentioning

confidence: 99%

Wideband Synthetic-Aperture Millimeter-Wave Spatial-Channel Reference System With Traceable Uncertainty Framework

Vouras

Jamroz

Weiss

et al. 2023

IEEE Open J. Veh. Technol.

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This paper describes a wideband synthetic-aperture system and the associated Fourier processing for generating high-resolution spatial and temporal estimates of the signal propagation environment in wireless communication channels at millimeter-wave frequencies. We describe how to configure the synthetic aperture system for high angular resolution by sampling the progression of signal phase across a large planar area in space. We also show how to synthesize discrete measurements of the channel frequency response taken sequentially over a wide bandwidth to create power delay profiles (PDPs) in specified angular directions with high delay resolution. We provide a rigorous uncertainty analysis that can be made metrologically traceable to fundamental physical standards. This uncertainty framework can propagate the errors inherent in the measured signals through to the final channel estimates and derived parameters such as root-mean-square delay or angular spread. We illustrate use of the system in conjunction with two different analysis tools to extract both narrowband and wideband parameter estimates from the synthetic aperture, allowing its use as a stand-alone channel sounder or as a tool for verifying the performance of wireless devices.

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“…This section describes the NIST SAMURAI (Synthetic Aperture Measurement UnceRtainty for Angle of Incidence) channel sounder [35], [36], for recording channel measurements. The system hardware is first described, followed by procedures implemented to calibrate the system.…”

Section: Samurai Channel Soundermentioning

confidence: 99%

Methodology for Measuring the Frequency Dependence of Multipath Channels Across the Millimeter-Wave Spectrum

Güven

Jamroz

Chuang

et al. 2022

IEEE Open J. Antennas Propag.

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Millimeter-wave (mmWave) communications promise Gigabit/s data rates thanks to the availability of large swaths of bandwidth between 10-100 GHz. Although cellular operators prefer the lower portions of the spectrum due to popular belief that propagation there is more favorable, the measurement campaigns to confirm this -conducted by ten organizations thus far -report conflicting results. Yet it is not clear whether the conflict can be attributed to the channel itself -measured in different environments and at different center frequencies -or to the differences in the organizations' channel sounders and sounding techniques. In this paper, we propose a methodology to measure mmWave frequency dependence, using the 26.5-40 GHz band as an example. The methodology emphasizes calibration of the equipment so that the measurement results represent the channel alone (and not the channel coupled with the channel sounder). Our results confirm that free-space propagation is indeed frequency invariant -a well understood phenomena but to our knowledge reported nowhere else at mmWave to date. More interestingly, we found that specular paths -the strongest after the line-of-sight path and so pivotal to maintaining connectivity during blockage -are the least invariant compared to weaker diffracted and diffuse paths.

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Configuration and Control of a Millimeter-Wave Synthetic Aperture Measurement System with Uncertainties

Cited by 11 publications

References 12 publications

A sparsity-constrained sampling method with applications to communications and inverse scattering

A sparsity-constrained sampling method with applications to communications and inverse scattering

Wideband Synthetic-Aperture Millimeter-Wave Spatial-Channel Reference System With Traceable Uncertainty Framework

Methodology for Measuring the Frequency Dependence of Multipath Channels Across the Millimeter-Wave Spectrum

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