Patents by Inventor Athina Petropulu

Athina Petropulu 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: 20230081408
    Abstract: Various embodiments comprise systems, methods, architectures, mechanisms or apparatus for determining a subsequent time slot position for each of a plurality of spatially distributed relays configured for time slot based beamforming supporting a communication channel between a source and a destination.
    Type: Application
    Filed: August 15, 2022
    Publication date: March 16, 2023
    Applicant: Rutgers, The State University of New Jersey
    Inventors: Athina Petropulu, SPILIOS EVMORFOS
  • Publication number: 20230032493
    Abstract: Various embodiments comprise systems, methods, architectures, mechanisms and apparatus providing a dual-function radar communication (DFRC) system a multiple-input multiple-output (MIMO) radar is configured to have only a small number of its antennas active in each channel use. Probing waveforms are of an orthogonal frequency division multiplexing (OFDM) type. OFDM carriers are divided into two groups, one group that is used by the active antennas in a shared fashion, and another group where each subcarrier is assigned to an active antenna in an exclusive fashion (e.g., private subcarriers). Target estimation is carried out based on the received and transmitted symbols. The system communicates information via the transmitted OFDM data symbols and the pattern of active antennas in a generalized spatial modulation (GSM) fashion. A multi-antenna communication receiver can identify the indices of active antennas via sparse signal recovery methods.
    Type: Application
    Filed: July 7, 2022
    Publication date: February 2, 2023
    Applicant: Rutgers, The State University of New Jersey
    Inventors: Athina Petropulu, Zhaoyi Xu
  • Publication number: 20210399788
    Abstract: Various embodiments comprise systems, methods, architectures, mechanisms and apparatus for relay beamforming of mmWave communications in an environment having signal blockage and signal attenuation challenges, such as found in an urban setting. The various embodiments support distributed, relay-assisted beamforming mechanisms that exploit the spatial diversity of mmWave signal propagation, including a resource efficient relay selection scheme designed to optimally enhance QoS in 2-hop Amplify-and-Forward (AF) cooperative networks. Relay selection is implemented in a predictive and distributed manner, with some embodiments also employing predictive schemes to optimally select transmitting relays.
    Type: Application
    Filed: June 21, 2021
    Publication date: December 23, 2021
    Applicant: Rutgers, The State University of New Jersey
    Inventors: Athina Petropulu, Anastasios Dimas, Dionysios Kalogerias
  • Patent number: 7929937
    Abstract: A system and method for blind estimation of carrier frequency offsets (CFOs) and separation of user signals in wireless communications systems are provided. Blind estimation of CFOs (i.e., without knowledge of the conditions of the transmitter or the transmission medium/channel) is carried out in order to improve reception quality by a wireless communications device. A received RF signal is over-sampled by a pre-defined over-sampling factor, and polyphase components are extracted from the over-sampled signal. The polyphase components are used to construct a virtual receiver output matrix, e.g., a model of the received signal and its associated output matrix. System response conditions are blindly estimated by applying a blind system estimation algorithm to the virtual receiver output matrix.
    Type: Grant
    Filed: October 24, 2007
    Date of Patent: April 19, 2011
    Assignee: The Trustees of Princeton University
    Inventors: Visa Koivunen, Athina Petropulu, H. Vincent Poor, Yuanning Yu
  • Publication number: 20090111411
    Abstract: A system and method for blind estimation of carrier frequency offsets (CFOs) and separation of user signals in wireless communications systems are provided. Blind estimation of CFOs (i.e., without knowledge of the conditions of the transmitter or the transmission medium/channel) is carried out in order to improve reception quality by a wireless communications device. A received RF signal is over-sampled by a pre-defined over-sampling factor, and polyphase components are extracted from the over-sampled signal. The polyphase components are used to construct a virtual receiver output matrix, e.g., a model of the received signal and its associated output matrix. System response conditions are blindly estimated by applying a blind system estimation algorithm to the virtual receiver output matrix.
    Type: Application
    Filed: October 24, 2007
    Publication date: April 30, 2009
    Applicant: The Trustees of Princeton University
    Inventors: Visa Koivunen, Athina Petropulu, H. Vincent Poor, Yuanning Yu