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Enhancing Multi-Subject Vital Sign Estimation by Utilizing the Generalized Sidelobe Canceller
Abdel-Kareem Moadi;Chandler Bauder;Abdel-Hamid Djouadi;Paul Theilmann;Aly E. Fathy
2024 IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNeT)
Year: 2024 | Conference Paper |
The paper presents a comprehensive approach using radar technology for non-contact vital sign monitoring, focusing on multi-subject scenarios. By leveraging a Multiple Input, Multiple Output (MIMO) radar configuration with Direction of Arrival (DoA) methods, along with digital beamforming, the Generalized Sidelobe Canceller, and a frequency tracing technique, the study achieves impressive accuracy...Show More
Compact Millimeter Wave Radar for Vital Sign Detection: A Comprehensive Study
2023 16th International Conference on Advanced Technologies, Systems and Services in Telecommunications (TELSIKS)
Year: 2023 | Conference Paper |
With the increased interest of non-contact vital sign detection, the need for a small, compact radar has emerged. The development of millimeter-wave radars and Antenna-on-Package (AoP) solutions provides a solution for a portable, small form factor device. In this paper, a commercial, compact millimeter wave radar operating at 60 GHz is used to accurately detect vital signs. With the use of a supe...Show More
Development of a Multi-Functional Remote Health Monitoring System
Chandler J. Bauder;Abdel-Kareem Moadi;Paul T. Theilmann;Aly E. Fathy
2023 International Microwave and Antenna Symposium (IMAS)
Year: 2023 | Conference Paper |
With the increased concern over contact-transmitted diseases and the rapid growth in the field of telemedicine, it is critical to develop remote diagnostic systems to meet these needs. In this paper, multiple methods of remote vital sign estimation are explored and combined to form a multi-functional remote health monitoring system. Camera-based systems are utilized to estimate patient heart rate,...Show More
Remote Vital Sign Monitoring With Reduced Random Body Swaying Motion Using Heartbeat Template and Wavelet Transform Based on Constellation Diagrams
Toan K. Vo Dai;Yao Yu;Paul Theilmann;Aly E. Fathy;Ozlem Kilic
Remote vital signs monitoring using millimeter-wave (mmWave) sensors has gained lots of attention because of their contactless, portable advantages. However, their received signals are more sensitive to random body motions (RBM) which degrades the accuracy of heart rate (HR) detection. To overcome this challenge, multi-input multi-output (MIMO) configuration can be used to reduce RBM's impact as e...Show More
Enhancement of Remote Vital Sign Monitoring Detection Accuracy Using Multiple-Input Multiple-Output 77 GHz FMCW Radar
Toan K. Vo Dai;Kellen Oleksak;Tsotne Kvelashvili;Farnaz Foroughian;Chandler Bauder;Paul Theilmann;Aly E. Fathy;Ozlem Kilic
Remote non-contact monitoring of human vital signs has recently received lots of attention due to the advancement and availability of millimeter wave (mmWave) radars. These sensors are significantly reduced in size, but still face serious electromagnetic (EM) propagation loss and signal obstructions resulting in lower signal-to-noise ratios (SNR). As mmWave received signals also have higher sensit...Show More
Non-Contact Multi-Subject Human Gait Analysis Using A State-Space Method With Enhanced 1-D Block Representation
Farnaz Foroughian;Farhan Quaiyum;Paul Theilmann;Bardia Ghajari;Jean E. Piou;Ozlem Kilic;Aly E. Fathy
A stepped-frequency continuous-wave (SFCW) radar system with adequate pulse repetition frequency (PRF) is developed to track relatively fast motions from various parts of the human body, separately. Robust signal processing technique is utilized, where a 1-D block processing technique, based on state-space method (SSM) is developed in two dimensions to form an enhanced Hankel matrix to track human...Show More
Robust Biopotential Acquisition via a Distributed Multi-Channel FM-ADC
Julian Warchall;Paul Theilmann;Yuxuan Ouyang;Harinath Garudadri;Patrick P. Mercier
This contribution presents an active electrode system for biopotential acquisition using a distributed multi-channel FM-modulated analog front-end and ADC architecture. Each electrode captures one biopotential signal and converts to a frequency modulated signal using a VCO tuned to a unique frequency. Each electrode then buffers its output onto a shared analog line that aggregates all of the FM-mo...Show More
22.2 A Rugged Wearable Modular ExG Platform Employing a Distributed Scalable Multi-Channel FM-ADC Achieving 101dB Input Dynamic Range and Motion-Artifact Resilience
Julian Warchall;Paul Theilmann;Yuxuan Ouyang;Harinath Garudadri;Patrick P. Mercier
2019 IEEE International Solid-State Circuits Conference - (ISSCC)
Year: 2019 | Conference Paper |
Wearable ExG biopotential acquisition systems can potentially capture a wealth of clinically useful diagnostic information during activities of daily life. In practice, however, motions from common activities introduce large artifacts that can easily saturate traditional analog front-ends (AFEs) designed to sense biopotentials on the micro- to milli-volt scale. In addition, the wires that connect ...Show More
A broadband envelope-tracking push-pull GaN power amplifier using grounded-coplanar ring Marchand balun
Hamed Gheidi;Paul Theilmann;Jonmei J. Yan;Toshifumi Nakatani;Don Kimball
2018 IEEE 19th Wireless and Microwave Technology Conference (WAMICON)
Year: 2018 | Conference Paper |
Cited by: Papers (4)
This paper presents a broadband (0.5GHz to 2.2GHz) power amplifier with output power up to 25W and drain efficiency up to 69%. Further, its use in an envelope tracking system to achieve high efficiency in backoff over a comparable carrier bandwidth is presented. The RF PA employs a 0.25um (Cree) GaN process in a custom IC design, together with a broadband and low-loss planar Marchand balun impleme...Show More
Electromagnetic Modeling of Vital Sign Detection and Human Motion Sensing Validated by Noncontact Radar Measurements
Farhan Quaiyum;Nghia Tran;Tuan Phan;Paul Theilmann;Aly E. Fathy;Ozlem Kilic
Technology to analyze human motion has significantly advanced over the last few years. Locomotion studies have proved useful and have been practically applicable to some gait analysis. However, its use has been hampered by the amount of data generated and the limitations to the interpretation capabilities of this massive data. New techniques need to be developed to capture data rapidly, accurately...Show More
The wavelength selection for calibrating non-contact detection of blood oxygen satuartion using imaging photoplethysmography
Farnaz Foroughian;Chandler J. Bauder;Aly E. Fathy;Paul T. Theilmann
2018 United States National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM)
Year: 2018 | Conference Paper |
Based on imaging photoplethismography theory, two videos recorded at two different wavelengths of the visible light spectrum can be used to measure oxygen saturation (SpO2), in a non-contact way. Here, we present better selection of these two wavelengths to detect SpO2 level under ambient light and temperatures.Show More
Comparison Study of Noncontact Vital Signs Detection Using a Doppler Stepped-Frequency Continuous-Wave Radar and Camera-Based Imaging Photoplethysmography
Lingyun Ren;Lingqin Kong;Farnaz Foroughian;Haofei Wang;Paul Theilmann;Aly E. Fathy
In this paper, we compare the performance of radar and optical (camera based) techniques in detecting vital signs such as respiratory rate (RR), heart rate (HR), and blood oxygen saturation (SpO2). Specifically, we investigate the application of ultrawideband stepped-frequency continuous-wave radar and imaging photoplethysmography (iPPG) techniques to measure vital signs. The radar performance can...Show More
A multi-channel EEG system featuring single-wire data aggregation via FM-FDM techniques
Julian Warchall;Aishwarya Balakrishnan;Özgür Balkan;Patrick P. Mercier;Harinath Garudadri;W. David Hairston;Paul Theilmann
2016 IEEE International Symposium on Circuits and Systems (ISCAS)
Year: 2016 | Conference Paper |
Conventional EEG systems are extremely power hungry due to a reliance on high resolution analog-to-digital converters (ADCs) to cover their required dynamic range. This paper presents a novel architecture for acquiring multi-channel high-resolution EEG using low power techniques. Instead of digitizing the output of each analog front-end (AFE) amplifier with an individual ADC, a voltage-controlled ...Show More
An envelope linearization algorithm for an open-loop multi-switcher envelope tracking power amplifier
Toshifumi Nakatani;Jonmei J. Yan;Paul T. Theilmann;Hamed Gheidi;Donald F. Kimball
2016 IEEE MTT-S International Microwave Symposium (IMS)
Year: 2016 | Conference Paper |
Cited by: Papers (2)
A linearization algorithm for the envelope supply voltage waveform is proposed for an open-loop multi-switcher envelope tracking power amplifier (ETPA). To maintain the fidelity of the supply voltage, we develop a two-step method comprising “non-linear pre-emphasis” and “envelope memory polynomial digital predistortion”, where the captured supply voltage of an RFPA is used. An ETPA is demonstrated...Show More
Envelope Modulator & X-Band MMICs on Highly Integrated 3D Tunable Microcoax Substrate
D. F. Kimball;H. Kazeimi;J. J. Yan;P. T. Theilmann;I. Telleiz;G. Collins
2015 IEEE Compound Semiconductor Integrated Circuit Symposium (CSICS)
Year: 2015 | Conference Paper |
Cited by: Papers (7)
As next generation wireless communication systems move to higher data rates, the bandwidth (BW) and peak to average power ratio (PAPR) of the signal increase. Envelope tracking power amplifier systems provide a means to efficiently amplify these complex waveforms. Envelope power modulators, which achieve greater than 70% EA efficiency while reproducing the envelope of up to 100MHz (DC-500 MHz enve...Show More
A 500 MHz portable evaluation platform for digital pre-distortion and envelope tracking power amplifiers
Jonmei J. Yan;Toshifumi Nakatani;Paul Theilmann;Donald F. Kimball
2015 85th Microwave Measurement Conference (ARFTG)
Year: 2015 | Conference Paper |
Efficiency and linearity are important design criteria for power amplifier (PA) designers. These two constraints usually contradict each other in the realm of PAs. However, with many recent efforts, various architectures such as envelope tracking, when used in conjunction with digital pre-distortion, allow the system to achieve both efficiency and linearity simultaneously. Many of the available ev...Show More
High efficiency multi-band envelope tracking power amplifier with tunable output frequency bands
Chan-Sei Yoo;Youjiang Liu;John Fairbanks;Peter Asbeck;Paul Theilmann;Donald Kimball
2015 IEEE 16th Annual Wireless and Microwave Technology Conference (WAMICON)
Year: 2015 | Conference Paper |
Cited by: Papers (4)
A multi-band power amplifier (PA) with electrically tunable output matching network is reported, whose output power and efficiency can be optimized over multiple frequencies (750MHz, 880MHz and 940MHz). It is incorporated within an envelope tracking (ET) amplifier using a high efficiency dynamic envelope voltage supply. High efficiency (50%) for all the three bands has been demonstrated with good ...Show More
High efficiency envelope tracking power amplifiers for wide modulation bandwidth signals (invited)
2014 Asia-Pacific Microwave Conference
Year: 2014 | Conference Paper |
As next generation wireless communication systems move to higher data rates, the bandwidth (BW) and peak to average power ratio (PAPR) of the signal increase. Envelope tracking power amplifier systems provide a means to efficiently amplify these complex waveforms. Envelope power modulators paired with various amplifiers are presented with high efficiency and linearity‥Show More
A 60MHz Bandwidth High Efficiency X-Band Envelope Tracking Power Amplifier
Paul T. Theilmann;Jonmei J. Yan;Cuong Vu;Jeong-Sun Moon;Harris P. Moyer;Donald F. Kimball
2013 IEEE Compound Semiconductor Integrated Circuit Symposium (CSICS)
Year: 2013 | Conference Paper |
Cited by: Papers (14)
This paper presents a high efficiency X-band envelope-tracking power amplifier (PA) that achieves a 60MHz modulation bandwidth. The system consists of a wideband envelope modulator and a single-chip gallium- nitride (GaN) MMIC X-band PA. The envelope modulator achieves >70% efficiency while delivering >7W into an 8Ω resistive load for a 60MHz LTE-A modulated signal with a 6.6dB PAPR. The envelope ...Show More
A High Efficiency 780 MHz GaN Envelope Tracking Power Amplifier
2012 IEEE Compound Semiconductor Integrated Circuit Symposium (CSICS)
Year: 2012 | Conference Paper |
A high efficiency GaN envelope tracking power amplifier (ETPA) operated at 780 MHz, corresponding to LTE band class 14, is presented. The ETPA was tested with both a 6.6 dB PAPR WCDMA signal and a 7.5 dB PAPR 10 MHz 16 QAM LTE signal. Under the WCDMA signal, a drain efficiency of ~70% with 13.5 dB of gain and 28.6 W of output power was measured. The corresponding NRMSE, ACPR1, and ACPR2 were 1.51%...Show More
A $\mu$ W Complementary Bridge Rectifier With Near Zero Turn-on Voltage in SOS CMOS for Wireless Power Supplies
Paul T. Theilmann;Calogero D. Presti;Dylan J. Kelly;Peter M. Asbeck
An inherent shortcoming of rectifiers designed using standard CMOS devices is poor low input power performance. It is shown that this can be overcome through the use of intrinsic devices with close to zero-threshold voltage available in a 0.25 μm silicon-on-sapphire (SOS) CMOS process. A novel complementary bridge rectifier structure based on a combination of cross-connected and diode bridge recti...Show More
Near zero turn-on voltage high-efficiency UHF RFID rectifier in silicon-on-sapphire CMOS
Paul T. Theilmann;Calogero D. Presti;Dylan Kelly;Peter M. Asbeck
2010 IEEE Radio Frequency Integrated Circuits Symposium
Year: 2010 | Conference Paper |
A UHF RFID rectifier which turns on at near zero input voltage is demonstrated. The rectifier is fabricated in 0.25-μm silicon-on-sapphire (SOS) CMOS technology using intrinsic, near zero threshold devices. A novel improved cross-coupled bridge topology is used to minimize the leakage incurred through the use of intrinsic devices while maintaining their low power turn on characteristics. The fabri...Show More
Enhanced Electromagnetic Interference Shielding Through the Use of Functionalized Carbon-Nanotube-Reactive Polymer Composites
Sung-Hoon Park;Paul T. Theilmann;Peter M. Asbeck;Prabhakar R. Bandaru
We report on a new principle yielding enhanced electromagnetic shielding, using as an example a composite comprised of carbon nanotubes (CNTs) integrated with a reactive ethylene terpolymer (RET). Such composites were synthesized through the chemical reaction of the functional groups on the CNT with the epoxy linkage of the RET polymer. The main advantages of these composites include good dispersi...Show More
An Analytical Model for Inductively Coupled Implantable Biomedical Devices With Ferrite Rods
Using approximations applicable to near field coupled implants simplified expressions for the complex mutual inductance of coaxial aligned coils with and without a cylindrical ferrite rod are derived. Experimental results for ferrite rods of various sizes and permeabilities are presented to verify the accuracy of this expression. An equivalent circuit model for the inductive link between an implan...Show More
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