Patents by Inventor Daniel W. Bliss

Daniel W. Bliss has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20220286172
    Abstract: Multi-stage distributed beamforming for distributed mosaic wireless networks is provided. Embodiments described herein present systems, devices, and methods that provide increased range, data rate, and robustness to interference and jamming. A distributed mosaic wireless network includes a transmitter, a receiver, and one or more distributed clusters of radios referred to herein as mosaics or relay mosaics. Each mosaic consists of several distributed, cooperative radio transceivers (e.g., mosaic nodes) that relay a signal sent by the transmitter towards the receiver. In some embodiments, a single-stage beamforming technique is implemented whereby the transmitter sends a signal to a first mosaic, which then relays this signal by beamforming to the receiver. In some embodiments, a multi-stage beamforming technique is implemented whereby the transmitter sends a signal to a first mosaic, which then relays this signal by beamforming to a second mosaic, which then relays this signal by beamforming to the receiver.
    Type: Application
    Filed: March 7, 2022
    Publication date: September 8, 2022
    Applicant: Arizona Board of Regents on behalf of Arizona State University
    Inventors: Andrew Herschfelt, Daniel W. Bliss, Owen Ma, Jacob Holtom
  • Publication number: 20220256496
    Abstract: Constant information ranging for dynamic spectrum access in a joint positioning-communications system is provided. Embodiments described herein provide a simultaneous positioning, navigation, timing, and communications system that cooperatively executes multiple radio frequency (RF) services. A constant-information ranging (CIR) strategy or algorithm is defined that maintains constant information learned about an incoherent moving target by modulating a revisit interval to minimize the number of interactions. This significantly reduces spectral congestion and offers a control mechanism to dynamically manage spectral access. The CIR algorithm is validated in a simulation environment where a 91% reduction in spectral access for a particular flight path is observed while maintaining a 3-centimeter (cm) precision in ranging.
    Type: Application
    Filed: January 31, 2022
    Publication date: August 11, 2022
    Applicant: Arizona Board of Regents on behalf of Arizona State University
    Inventors: Sharanya Srinivas, Daniel W. Bliss
  • Publication number: 20220247501
    Abstract: Hybrid in-situ and signal of opportunity (SoOP) calibration for antenna arrays is provided. Deployment of aircraft antennae is redesigned to support multiple services with shared physical elements that conform to the exterior of an aircraft to mitigate drag. Conformal arrays are, however, susceptible to structural changes in the fuselage that manifest as pointing errors and side lobe degradation. Embodiments provide an online calibration algorithm that leverages cooperative satellites in direct line-of-sight of a radio frequency (RF) device with an antenna array (e.g., an aircraft with a conformal antenna array) to optimally steer beams. These external calibration sources supplement an in-situ source mounted on a common platform with the antenna array (e.g., placed on the aircraft's tail). Models are established for potential sources of mismatch and the hybrid calibration method is demonstrated via simulations.
    Type: Application
    Filed: January 31, 2022
    Publication date: August 4, 2022
    Applicant: Arizona Board of Regents on behalf of Arizona State University
    Inventors: Sharanya Srinivas, Daniel W. Bliss
  • Publication number: 20220142478
    Abstract: A precise cardiac data reconstruction method is provided, which may also be referred to herein as radar cardiography (RCG). RCG can reconstruct cardiac data, such as heart rate and/or electrocardiogram (ECG)-like heartbeat waveform signals wirelessly by using advanced radar signal processing techniques. For example, heartbeat and related characteristics can be monitored by isolating cardiovascular activity from strong respiratory interference in spatial spaces: azimuth and elevation. This results in significant improvements to pulse signal-to-noise-ratio (SNR) compared to conventional approaches, facilitating heart-rate variability (HRV) analysis.
    Type: Application
    Filed: March 19, 2020
    Publication date: May 12, 2022
    Inventors: Daniel W. Bliss, Yu Rong
  • Publication number: 20220060857
    Abstract: A hyper-precise positioning and communications (HPPC) system and network are provided. The HPPC system is a next-generation positioning technology that promises a low-cost, high-performance solution to the need for more sophisticated positioning technologies in increasingly cluttered environments. The HPPC system is a joint positioning-communications radio technology that simultaneously performs relative positioning and secure communications. Both of these tasks are performed with a single, co-use waveform, which efficiently utilizes limited resources and supports higher user densities. Aspects of this disclosure include an HPPC system for a network which includes an arbitrary number of network nodes (e.g., radio frequency (RF) devices communicating over a joint positions-communications waveform). As such, networking protocols and design of data link and physical layers are described herein.
    Type: Application
    Filed: November 8, 2021
    Publication date: February 24, 2022
    Applicant: Arizona Board of Regents on behalf of Arizona State University
    Inventors: Andrew Herschfelt, Daniel W. Bliss
  • Publication number: 20220051039
    Abstract: Biometric identification using electroencephalogram (EEG) signals is provided. Embodiments are targeted for biometric applications, where an individual can be identified with a precision of over 99%, using sensed brain signals. In particular, a method is described which can extract unique biomarkers from EEG response signals to classify individuals, also referred to as simple visual reaction task-based EEG biometry (SVRTEB). A subject experiences a simple stimulus or task, and a multi-channel EEG response is recorded. Unique biomarkers are extracted from the recorded EEG response (e.g., as periodogram data points corresponding to different frequencies observed in the brain waves, which can be used to identify a person). A novel signal processing approach uses neural network-based architecture to analyze the EEG response and identify the subject. This signal processing architecture can be readily implemented on hardware and provides high accuracy, precision, and recall.
    Type: Application
    Filed: August 13, 2021
    Publication date: February 17, 2022
    Applicant: Arizona Board of Regents on behalf of Arizona State University
    Inventors: Mohammad Samin Nur Chowdhury, Arindam Dutta, Daniel W. Bliss, Gene Brewer, Christopher Blais, Matthew Robison
  • Publication number: 20210353156
    Abstract: Methods, systems, and devices for direct radio frequency (RF) signal processing for heart rate (HR) monitoring using ultra-wide band (UWB) impulse radar are presented. A radar sensor is able to directly sample a received signal at RF which satisfies the Nyquist sampling rate, preserving a subject's vital sign information in the received signal. The vital sign information can be extracted directly from a raw RF signal and thus down conversion to a complex baseband is not required. The HR monitoring performance from the proposed direct RF signal processing technique provides an improvement in continuous HR monitoring as compared against existing methods using a complex baseband signal and/or other measurement techniques.
    Type: Application
    Filed: September 27, 2019
    Publication date: November 18, 2021
    Inventors: Yu Rong, Daniel W. Bliss
  • Patent number: 11172334
    Abstract: A hyper-precise positioning and communications (HPPC) system and network are provided. The HPPC system is a next-generation positioning technology that promises a low-cost, high-performance solution to the need for more sophisticated positioning technologies in increasingly cluttered environments. The HPPC system is a joint positioning-communications radio technology that simultaneously performs relative positioning and secure communications. Both of these tasks are performed with a single, co-use waveform, which efficiently utilizes limited resources and supports higher user densities. Aspects of this disclosure include an HPPC system for a network which includes an arbitrary number of network nodes (e.g., radio frequency (RF) devices communicating over a joint positions-communications waveform). As such, networking protocols and design of data link and physical layers are described herein.
    Type: Grant
    Filed: February 11, 2020
    Date of Patent: November 9, 2021
    Assignee: Arizona Board of Regents on behalf of Arizona State University
    Inventors: Andrew Herschfelt, Daniel W. Bliss
  • Publication number: 20210132182
    Abstract: Position information estimation in a distributed radio frequency (RF) communications system is provided. Embodiments disclosed herein facilitate high-precision estimations of positions, orientations, velocities, and acceleration of network nodes in a distributed RF network. The distributed RF communications system incorporates a series of estimation processes which makes it susceptible to propagation of errors. To ensure robustness of the distributed RF communications system, relative positions of network nodes are tracked by iteratively tracking parameters used for estimating position information. Some embodiments take advantage of Kalman filtering algorithms by leveraging principles directed by physics. At every network node, several filtering algorithms can be employed to synchronize clocks, track delay between multiple-input multiple-output (MIMO) antennas and estimate position and orientation of other network nodes.
    Type: Application
    Filed: November 4, 2020
    Publication date: May 6, 2021
    Applicant: Arizona Board of Regents on behalf of Arizona State University
    Inventors: Sharanya Srinivas, Andrew Herschfelt, Daniel W. Bliss
  • Publication number: 20210132177
    Abstract: Position information estimation in a distributed radio frequency (RF) communications system is provided. Embodiments disclosed herein facilitate high-precision estimations of positions, orientations, velocities, and acceleration of network nodes in a distributed RF network (e.g., including base stations and vehicles, such as aircraft or unmanned aerial systems (UASs)). Modern radio systems must adapt to limited spectral access by reducing spectrum demand and increasing operational efficiency. In this regard, an RF system is provided which simultaneously performs positioning and communications tasks. This system specifically addresses the issue of spectral congestion by employing an extremely efficient positioning strategy and using a joint waveform that simultaneously enables both tasks. This efficiency in turn supports more users in a given frequency allocation.
    Type: Application
    Filed: November 4, 2020
    Publication date: May 6, 2021
    Applicant: Arizona Board of Regents on behalf of Arizona State University
    Inventors: Sharanya Srinivas, Andrew Herschfelt, Daniel W. Bliss
  • Publication number: 20200319330
    Abstract: Systems and devices for phase-accurate vehicle positioning are disclosed. These systems and devices facilitate high-precision estimations of positions, orientations, velocities, and accelerations of signal nodes in a distributed network (e.g., including base stations and vehicles, such as aircraft or unmanned aerial systems (UASs)). The positioning estimations are based on time-of-arrival estimations of low-bandwidth signals and a phase-accurate distributed coherence algorithm. In some cases, the low-bandwidth signals may further facilitate joint communications and positioning estimations between the signal nodes.
    Type: Application
    Filed: December 20, 2018
    Publication date: October 8, 2020
    Applicant: Arizona Board of Regents on Behalf of Arizona State University
    Inventor: Daniel W. Bliss
  • Publication number: 20200297227
    Abstract: A vital sign monitoring system using an optical sensor is provided. The vital sign monitoring system, and related methods and devices described herein, is equipped with a camera or other optical sensor to remotely detect and measure one or more physiological parameters (e.g., vital signs) of a subject. For example, the vital sign monitoring system can detect, measure, and/or monitor heart rates and respiration rates from one or multiple subjects simultaneously using advanced signal processing techniques, including adaptive color beamforming to more accurately detect and measure the vital sign(s) of interest.
    Type: Application
    Filed: March 19, 2020
    Publication date: September 24, 2020
    Applicant: Arizona Board of Regents on behalf of Arizona State University
    Inventors: Yu Rong, Daniel W. Bliss
  • Publication number: 20200302609
    Abstract: Detecting abnormalities in vital signs of subjects of videos is provided. Aspects of the present disclosure include methods, apparatuses, and systems to detect and measure vital sign information of one or more human subjects of a video and detect abnormalities in the vital sign information. In some examples, such abnormalities can be used to indicate video data is likely altered or fraudulent. In this regard, imaging photophlethysmography (IPPG) and advanced signal processing techniques, including adaptive color beamforming, can be used to extract the vital signs of the video subjects.
    Type: Application
    Filed: March 19, 2020
    Publication date: September 24, 2020
    Applicant: Arizona Board of Regents on behalf of Arizona State University
    Inventors: Yu Rong, Daniel W. Bliss
  • Publication number: 20200260225
    Abstract: A hyper-precise positioning and communications (HPPC) system and network are provided. The HPPC system is a next-generation positioning technology that promises a low-cost, high-performance solution to the need for more sophisticated positioning technologies in increasingly cluttered environments. The HPPC system is a joint positioning-communications radio technology that simultaneously performs relative positioning and secure communications. Both of these tasks are performed with a single, co-use waveform, which efficiently utilizes limited resources and supports higher user densities. Aspects of this disclosure include an HPPC system for a network which includes an arbitrary number of network nodes (e.g., radio frequency (RF) devices communicating over a joint positions-communications waveform). As such, networking protocols and design of data link and physical layers are described herein.
    Type: Application
    Filed: February 11, 2020
    Publication date: August 13, 2020
    Applicant: Arizona Board of Regents on behalf of Arizona State University
    Inventors: Andrew Herschfelt, Daniel W. Bliss
  • Patent number: 8358716
    Abstract: Techniques for synchronizing a receiver and transmitter in a wireless communication system address synchronization within the context of a detection formulation and provide synchronization statistics used to declare a synchronization detection. A signal is received from a channel at multiple receiving antennas. The receiver and transmitter are synchronized based on the received signal and a channel model incorporating the multiple receiving antennas. The channel model may also incorporate a resolvable delay spread of the received signal with respect to each receiving antenna. Synchronization may be based on a known component of a received signal and further on a channel model incorporating multiple receiving antennas and an interference signal. The known component may be a cyclic prefix or a pilot sequence as in orthogonal frequency division multiplexing (OFDM).
    Type: Grant
    Filed: March 6, 2009
    Date of Patent: January 22, 2013
    Assignee: Massachusetts Institute of Technology
    Inventors: Daniel W. Bliss, Peter A. Parker
  • Publication number: 20100226454
    Abstract: Techniques for synchronizing a receiver and transmitter in a wireless communication system address synchronization within the context of a detection formulation and provide synchronization statistics used to declare a synchronization detection. A signal is received from a channel at multiple receiving antennas. The receiver and transmitter are synchronized based on the received signal and a channel model incorporating the multiple receiving antennas. The channel model may also incorporate a resolvable delay spread of the received signal with respect to each receiving antenna. Synchronization may be based on a known component of a received signal and further on a channel model incorporating multiple receiving antennas and an interference signal. The known component may be a cyclic prefix or a pilot sequence as in orthogonal frequency division multiplexing (OFDM).
    Type: Application
    Filed: March 6, 2009
    Publication date: September 9, 2010
    Applicant: MASSACHUSETTS INSTITUTE OF TECHNOLOGY
    Inventors: Daniel W. Bliss, Peter A. Parker
  • Patent number: 6745050
    Abstract: For multichannel multiuser detection in a wireless communication system such as a CDMA system, for a set of user spreading codes, coefficients to delay lines are adjusted and the delay line output processed to estimate a symbol. The symbol is estimated based on a space-time correlation for an antenna space delay time correlation. The estimated symbol is then remodulated and subtracted from the received antenna signal corresponding to other users of the wireless communication system. The adjusting and processing are iterated until the estimated symbols converge such that they correspond to a predetermined symbol decision criteria.
    Type: Grant
    Filed: February 14, 2001
    Date of Patent: June 1, 2004
    Assignee: Massachusetts Institute of Technology
    Inventors: Keith W. Forsythe, Daniel W. Bliss