Daniel W. Bliss
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View article: Distributed Coherent Beamforming at 60 GHz Enabled by Optically-Established Coherence
Distributed Coherent Beamforming at 60 GHz Enabled by Optically-Established Coherence Open
We implement and experimentally demonstrate a 60 GHz distributed system leveraging an optical time synchronization system that provides precise time and frequency alignment between independent elements of the distributed mesh. Utilizing su…
View article: Multi-Subject Remote Heart Sound Monitoring Using mmWave MIMO RADAR
Multi-Subject Remote Heart Sound Monitoring Using mmWave MIMO RADAR Open
This work presents a novel non-contact heart sound monitoring approach using millimeter-wave RADAR technology. The proposed system enables simultaneous heart sound acquisition from multiple subjects, offering a contactless and efficient al…
View article: A Speech Production Model for Radar: Connecting Speech Acoustics with Radar-Measured Vibrations
A Speech Production Model for Radar: Connecting Speech Acoustics with Radar-Measured Vibrations Open
Millimeter Wave (mmWave) radar has emerged as a promising modality for speech sensing, offering advantages over traditional microphones. Prior works have demonstrated that radar captures motion signals related to vocal vibrations, but ther…
View article: Identifying Gut Microbiome Features that Predict Responsiveness Toward a Prebiotic Capable of Increasing Calcium Absorption: A Pilot Study
Identifying Gut Microbiome Features that Predict Responsiveness Toward a Prebiotic Capable of Increasing Calcium Absorption: A Pilot Study Open
Previously, we demonstrated that prebiotics may provide a complementary strategy for increasing calcium (Ca) absorption in adolescents which may improve long-term bone health. However, not all children responded to prebiotic intervention. …
View article: Analog-Domain Self-Interference Cancellation for Practical Multi-Tap Full-Duplex System: Theory, Modeling, and Algorithm
Analog-Domain Self-Interference Cancellation for Practical Multi-Tap Full-Duplex System: Theory, Modeling, and Algorithm Open
Practical, in-band, full-duplex (IBFD) systems typically require more than 100 dB of self-interference cancellation (SIC). Digital processing alone is insufficient for achieving this target, which drives us towards supplementary analog mit…
View article: Vision Guided MIMO Radar Beamforming for Enhanced Vital Signs Detection in Crowds
Vision Guided MIMO Radar Beamforming for Enhanced Vital Signs Detection in Crowds Open
Radar as a remote sensing technology has been used to analyze human activity for decades. Despite all the great features such as motion sensitivity, privacy preservation, penetrability, and more, radar has limited spatial degrees of freedo…
View article: Extended Kalman Filter Design for Tracking Time-of-Flight and Clock Offsets in a Two-Way Ranging System
Extended Kalman Filter Design for Tracking Time-of-Flight and Clock Offsets in a Two-Way Ranging System Open
As radio frequency (RF) hardware continues to improve, two-way ranging (TWR) has become a viable approach for high-precision ranging applications. The precision of a TWR system is fundamentally limited by estimates of the time offset T bet…
View article: Cramér–Rao Lower Bounds on 3D Position and Orientation Estimation in Distributed Ranging Systems
Cramér–Rao Lower Bounds on 3D Position and Orientation Estimation in Distributed Ranging Systems Open
As radio frequency (RF) hardware continues to improve, many technologies that were traditionally impractical have suddenly become viable alternatives to legacy systems. Two-way ranging (TWR) is often considered a poor positioning solution …
View article: Contactless Stethoscope Enabled by Radar Technology
Contactless Stethoscope Enabled by Radar Technology Open
Contactless vital sign measurement technologies have the potential to greatly improve patient experiences and practitioner safety while creating the opportunity for comfortable continuous monitoring. We introduce a contactless alternative …
View article: Communications and High-Precision Positioning (CHP2): Hardware Architecture, Implementation, and Validation
Communications and High-Precision Positioning (CHP2): Hardware Architecture, Implementation, and Validation Open
Spectral congestion and modern consumer applications motivate radio technologies that efficiently cooperate with nearby users and provide several services simultaneously. We designed and implemented a joint positioning-communications syste…
View article: WISCANet: A Rapid Development Platform for Beyond 5G and 6G Radio System Prototyping
WISCANet: A Rapid Development Platform for Beyond 5G and 6G Radio System Prototyping Open
Validating RF applications is traditionally time consuming, even for relatively simple systems. We developed the WISCA Software-Defined Radio Network (WISCANet) to accelerate the implementation and validation of radio applications over-the…
View article: Waveform Codesign for Radar–Communication Spectral Coexistence via Dynamic Programming
Waveform Codesign for Radar–Communication Spectral Coexistence via Dynamic Programming Open
In this article, we develop a new waveform codesign approach for radar–communications spectral coexistence using a decision-theoretic framework called partially observable Markov decision process (POMDP). The POMDP framework's natural look…
View article: [Front matter]
[Front matter] Open
MIT Lincoln Laboratory is a Department of Defense federally funded R&D center that develops advanced technologies to meet critical national security needs.Our concept-to-prototype development approach guides our R&D of diverse systems, inc…
View article: Terahertz-Wave-Plethysmography (TPG): A New Principle of Radar Based Pulse Detection
Terahertz-Wave-Plethysmography (TPG): A New Principle of Radar Based Pulse Detection Open
This study presents findings at Terahertz (THz) frequency band for non-contact cardiac sensing application. For the first time, cardiac pulse information is simultaneously extracted using THz waves based on the two established principles i…
View article: Analyzing the relationship between productivity and human communication in an organizational setting
Analyzing the relationship between productivity and human communication in an organizational setting Open
Though it is often taken as a truism that communication contributes to organizational productivity, there are surprisingly few empirical studies documenting a relationship between observable interaction and productivity. This is because co…
View article: Noncontact Vital Sign Detection With UAV-Borne Radars: An Overview of Recent Advances
Noncontact Vital Sign Detection With UAV-Borne Radars: An Overview of Recent Advances Open
Airborne radar carried on board unmanned aerial vehicles (UAVs) is serving as the harbinger of new remote sensing applications for security and rescue in inclement environments. The mobility and agility of UAVs, along with intelligent onbo…
View article: Motion-Tolerant Non-Contact Heart-Rate Measurements from Radar Sensor Fusion
Motion-Tolerant Non-Contact Heart-Rate Measurements from Radar Sensor Fusion Open
Microwave radar technology is very attractive for ubiquitous short-range health monitoring due to its non-contact, see-through, privacy-preserving and safe features compared to the competing remote technologies such as optics. The possibil…
View article: Computing Research Challenges in Next Generation Wireless Networking
Computing Research Challenges in Next Generation Wireless Networking Open
By all measures, wireless networking has seen explosive growth over the past decade. Fourth Generation Long Term Evolution (4G LTE) cellular technology has increased the bandwidth available for smartphones, in essence, delivering broadband…
View article: Novel Methodology to Assess RF Performance of Co-located MIMO Radar Systems Transmitting Binary Phased Coded Waveforms
Novel Methodology to Assess RF Performance of Co-located MIMO Radar Systems Transmitting Binary Phased Coded Waveforms Open
In this work an experimental radar testbed and dual directional couplers (DDC) are used to collect measurements of the forward and reverse waves at each element, its mutual coupling, and beam-patterns. The collected measured data is used t…
View article: Non-Contact Vital Signs Detection with UAV-Borne Radars
Non-Contact Vital Signs Detection with UAV-Borne Radars Open
Airborne radar carried on-board unmanned aerial vehicles (UAV) is serving as the harbinger of new remote sensing applications for security and rescue in inclement environments. The mobility and agility of UAVs along with intelligent on-boa…
View article: Deep Neural Network for Visual Stimulus-Based Reaction Time Estimation Using the Periodogram of Single-Trial EEG
Deep Neural Network for Visual Stimulus-Based Reaction Time Estimation Using the Periodogram of Single-Trial EEG Open
Multiplexed deep neural networks (DNN) have engendered high-performance predictive models gaining popularity for decoding brain waves, extensively collected in the form of electroencephalogram (EEG) signals. In this paper, to the best of o…
View article: Anticipating Postoperative Delirium During Burst Suppression Using Electroencephalography
Anticipating Postoperative Delirium During Burst Suppression Using Electroencephalography Open
The developed methodology anticipates incidences of postoperative delirium during rewarming, which potentially provides an opportunity to intervene and avert it.
View article: RadChat: Spectrum Sharing for Automotive Radar Interference Mitigation
RadChat: Spectrum Sharing for Automotive Radar Interference Mitigation Open
In the automotive sector, both radars and wireless communication are susceptible to interference. However, combining the radar and communication systems, i.e., radio frequency (RF) communications and sensing convergence, has the potential …
View article: Radar Waveform Optimization for Joint Radar Communications Performance
Radar Waveform Optimization for Joint Radar Communications Performance Open
We develop and present a radar waveform design method that optimizes the spectral shape of the radar waveform so that joint performance of a cooperative radar communications system is maximized. The continuous water-filling (WF) spectral-m…
View article: Upper Bound on the Joint Entropy of Correlated Sources Encoded by Good Lattices
Upper Bound on the Joint Entropy of Correlated Sources Encoded by Good Lattices Open
Lattices provide useful structure for distributed coding of correlated sources. A common lattice encoder construction is to first round an observed sequence to a ‘fine’ lattice with dither, then produce the result’s modulo to a ‘coarse’ la…
View article: Distributed Recovery of a Gaussian Source in Interference with Successive Lattice Processing
Distributed Recovery of a Gaussian Source in Interference with Successive Lattice Processing Open
A scheme for recovery of a signal by distributed listeners in the presence of Gaussian interference is constructed by exhausting an “iterative power reduction” property. An upper bound for the scheme’s achieved mean-squared-error distortio…
View article: Guest Editorial
Guest Editorial Open
The fourteen papers in this special section examine spectrum sharing. These papers represent a diverse set of applications, approaches, and technical disciplines, which is rather appropriate given the context. Specifically, the first group…
View article: Remote Sensing for Vital Information Based on Spectral-Domain Harmonic Signatures
Remote Sensing for Vital Information Based on Spectral-Domain Harmonic Signatures Open
In this paper, we propose an efficient and robust non-contact heart rate estimation algorithm. The key idea is to recover the fundamental heartbeat frequency from its higher-order spectral features. Our contributions are threefold: 1) care…