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Andreas Pedroß-Engel

Andreas Pedroß-Engel
ThruWave Inc.

Dipl.-Ing. Dr. techn.

About

36
Publications
5,973
Reads
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382
Citations
Introduction
Postdoctoral research associate which is specialized in cutting edge physics based signal processing for emerging technology areas as coherent computational imaging and noncoherent UWB systems. His research interests include wireless communication, system characterization and modeling, and nonlinear mixed-signal systems in various flavors.
Additional affiliations
November 2019 - present
University of Washington Seattle
Position
  • Researcher
May 2017 - present
ThruWave Inc.
Position
  • Founder
November 2014 - October 2019
University of Washington Seattle
Position
  • PostDoc Position
Education
March 2010 - July 2014
Graz University of Technology
Field of study
  • Signal Processing for Wireless Communications
September 2002 - June 2009
Graz University of Technology
Field of study
  • Electrical Engineering

Publications

Publications (36)
Article
Active millimeter-wave (mmWave) imaging illuminates a scene with a source of mmWave energy and forms images based on the reflected energy. When imaging objects (such as packaged goods in commerce) that have a mixture of opaque and translucent parts, two-sided reflection imaging can be used to overcome the occlusion by the opaque objects that would...
Article
Full-text available
Emerging metasurface antenna technology enables flexible and low cost massive multiple-input multiple-output (MIMO) millimeter-wave (mmW) imaging for applications such as personnel screening, weapon detection, reconnaissance, and remote sensing. This work proposes an orthogonal coded active illumination (OCAI) approach which utilizes simultaneous,...
Article
Analog multipliers are employed in many applications. In conventional RF front ends, for example, they are widely used for frequency conversion tasks. In noncoherent energy detectors or autocorrelation receivers, they multiply the (broadband) input signal by itself to achieve a down-conversion. Unfortunately, there exist no ideal hardware realizati...
Article
We present a modulated ultrawideband backscatter calibration target (fiducial) intended for group delay calibration in large-aperture multitransceiver millimeter-wave imagers. The fiducial is designed to resemble a modulated point scatterer across the K-band (17.5-26.5 GHz). Multiple such fiducials may be used to mitigate thermal and mechanical dri...
Article
This paper presents an extension of synthetic aperture radar (SAR) techniques to enable simultaneous radar imaging, sensor tag localization, and backscatter-based data uplink from multiple sensor tags in a cluttered environment. A unified system model is presented that leverages coherent processing of backscattered signals gathered over the synthet...
Article
Dynamic metamaterial antennas (DMAs) offer the potential to generate diverse beam patterns with less hardware complexity than traditional electronic beam steering arrays. This paper describes an enhanced resolution stripmap mode (ERSM) synthetic aperture radar (SAR) approach for 3-D imaging with DMAs, which achieves an improved resolution in all di...
Conference Paper
Full-text available
3D reconstruction using synthetic aperture radar (SAR) imaging is a computationally complex process due to the large amount of data involved. This paper proposes a partitioned reconstruction method for 3D SAR imaging, which leads to computationally efficient algorithms. The proposed method allows for parallel processing, e.g. using a general purpos...
Conference Paper
Computational imaging is a proven strategy for obtaining high-quality images with fast acquisition rates and simpler hardware. Metasurfaces provide exquisite control over electromagnetic fields, enabling the radiated field to be molded into unique patterns. The fusion of these two concepts can bring about revolutionary advances in the design of ima...
Article
We investigate the application of dynamic metasurface antennas (DMAs) to synthetic aperture radar (SAR) systems. Metasurface antennas can generate a multitude of tailored electromagnetic waveforms from a physical platform that is low-cost, lightweight, and planar; these characteristics are not readily available with traditional SAR technologies, su...
Article
To maintain sufficient signal-to-noise ratio (SNR) for image reconstruction and image interpretation, conventional synthetic aperture radar (SAR) systems must trade off resolution and scene size. This paper proposes a new SAR mode of operation, which improves resolution while maintaining good SNR and a large scene size. It leverages the unique prop...
Article
Undesired local oscillator (LO) leakage and dc offset impairments are commonly observed when direct conversion (or homodyne) receivers (RXs) are used for coherent millimeter-wave (mmW) active imaging, and are particularly severe when imaging short-range, slow-moving targets where the target's baseband response is close to dc. This letter proposes a...
Article
Full-text available
We demonstrate a low-profile holographic imaging system at millimeter wavelengths based on an aperture composed of frequency-diverse metasurfaces. Utilizing measurements of spatially-diverse field patterns, diffraction-limited images of human-sized subjects are reconstructed. The system is driven by a single microwave source swept over a band of fr...
Conference Paper
Synthetic aperture radar (SAR) images are representations of the microwave or millimeter-wave reflectivity of the observed scenes. SAR image reconstruction is an inverse problem, which can be solved via an approximation, e.g. matched filter (MF), or the explicit inverse using a large amount of measurement data. However, the approximation limits the...
Article
Synthetic aperture radar (SAR) synthesizes a large effective aperture via coherent processing of multiple measurements taken from a moving platform. We present an approach for SAR imaging using an X-band (10–13.7 GHz10–13.7 GHz) dynamic metasurface antenna (MSA). This newly developed antenna has over 6000 liquid-crystal-switched radiating elements...
Conference Paper
Optical depth cameras, including both time-of-flight and structured-light sensors, have led to dramatic improvements in robot sensing and perception. We propose the use of millimeter-wave (mmW) radar as an important complement to optical sensors. While the millimeter wavelengths of radar sensors do not support as high resolution as the nanometer wa...
Conference Paper
We present a localization and multiple access method for backscatter sensor networks based on synthetic aperture radar (SAR) techniques. Two sensor tags, each consisting of a wideband bow-tie antenna, a PIN switch, and an Arduino Nano, were designed for an indoor measurement over the 10–13 GHz band. With a synthetic aperture size of 0.6 m, the sens...
Conference Paper
We present a low cost X-band microwave backscatter communication testbed incorporating integrated planar wideband bow-tie antennas. This testbed leverages low cost silicon germanium (SiGe) integrated circuits intended for the satellite television market to provide an experimental capability for backscatter experimentation in the 10.0 GHz to 11.1 GH...
Thesis
Full-text available
This thesis investigates noncoherent multi-channel ultra-wideband receivers. Noncoherent ultra-wideband receivers promise low power consumption and low processing complexity as they, in contrast to coherent receiver architectures, relinquish the need of complex carrier frequency and phase recovering. Unfortunately, their peak data rate is limited b...
Presentation
Full-text available
Noncoherent ultra-wideband receivers promise low power consumption and low processing complexity as they, in contrast to coherent receiver architectures, relinquish the need of complex carrier frequency and phase recovering. Unfortunately, their peak data rate is limited by the delay spread of the multipath radio channel. Noncoherent multi-channel...
Presentation
Full-text available
Multiplication devices are used in many applications, e.g., for frequency up- and down-conversion. Metrics like conversion-gain or intercept-points of third order are defined to facilitate investigation and comparison of such devices. Unfortunately, these metrics are single-input-single-output metrics by nature. There exist no metric which describe...
Article
Full-text available
Digital IIR filter implementations are important building blocks of most communication systems. The chosen number format (fixed-point, floating-point; precision) has a major impact on achievable performance and implementation cost. Typically, filter design for communication systems is based on filter specifications in the frequency domain. We consi...
Conference Paper
Full-text available
Noncoherent UWB receivers promise low power consumption and low processing complexity but their peak data rate is limited by the delay spread of the multipath radio channel. A recently proposed multichannel autocorrelation receiver (AcR) can break this rate limit due to its multicarrier signal demodulation capability. In this paper, the hardware im...
Presentation
Full-text available
Noncoherent UWB receivers promise low power consumption and low processing complexity but their peak data rate is limited by the delay spread of the multipath radio channel. A recently proposed multichannel autocorrelation receiver (AcR) can break this rate limit due to its multicarrier signal demodulation capability. In this paper, the hardware im...
Conference Paper
Full-text available
Noncoherent UWB receivers promise low power consumption and low processing complexity but their peak data rate is limited by the delay spread of the multipath radio channel. A recently proposed multichannel autocorrelation receiver (AcR) can break this rate limit because it can demodulate multicarrier signals. The hardware implementation of this re...
Presentation
Full-text available
Noncoherent UWB receivers promise low power consumption and low processing complexity but their peak data rate is limited by the delay spread of the multipath radio channel. A recently proposed multichannel autocorrelation receiver (AcR) can break this rate limit because it can demodulate multicarrier signals. The hardware implementation of this re...
Presentation
Full-text available
Noncoherent ultra-wideband (UWB) promise low power and low complexity. This work proposes a high-rate UWB receiver consisting of multiple parallel autocorrelation channels with different delays which is able to decode noncoherent OFDM modulated signals.
Thesis
Full-text available
Correct pressure in car tires avoids accidents and reduces CO2 emissions. Hence the US government enacted the so called TREAD act in 2000. This act determines that in every new car produced after 2006 a tire pressure monitoring system (TPMS) has to be included. The Infineon SP3x chips series measures the pressure and temperature in the tires. Becau...

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Projects

Projects (3)
Archived project
The aim of this project was the demonstration, validation, and evaluation of a wireless multicarrier transmission scheme that employs a novel noncoherent receiver. The receiver supports energy detection of a multiband ultra-wideband (UWB) signal.
Archived project
This program proposed to exploit emerging advances in the fields of metamaterials and computational imaging to yield enhanced dynamic apertures for millimeter-wave, space-based imaging.
Archived project
This program has the goal to develop an advanced microwave/millimeter wave security screening and thread detection system (MetaImager) using metamaterial surface antennas, compressive and computatinal imaging technology, and custom designd RF hardware for the K and W-band.