Patents by Inventor Lee Freitag

Lee Freitag 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).

  • Patent number: 9294201
    Abstract: An underwater system including at least one input device that is in sensory communication with water and generates input signals. The system further includes at least one optical transmitter and at least one optical receiver that allow omni-directional transmission and reception through water of optical signals representing the input signals, and allow data rates greater than 1 Mbps.
    Type: Grant
    Filed: May 12, 2015
    Date of Patent: March 22, 2016
    Assignee: WOODS HOLE OCEANOGRAPHIC INSTITUTION
    Inventors: Norman E. Farr, Lee Freitag, James Preisig, Dana Yoerger, Sheri N. White, Alan D. Chave
  • Publication number: 20150372769
    Abstract: An underwater system including at least one input device that is in sensory communication with water and generates input signals. The system further includes at least one optical transmitter and at least one optical receiver that allow omni-directional transmission and reception through water of optical signals representing the input signals, and allow data rates greater than 1 Mbps.
    Type: Application
    Filed: May 12, 2015
    Publication date: December 24, 2015
    Inventors: Norman E. Farr, Lee Freitag, James Preisig, Dana Yoerger, Sheri N. White, Alan D. Chave
  • Patent number: 8953944
    Abstract: The systems and methods described herein provide a reconfigurable, long-range, optical modem-based underwater communication network. In particular, the network provides a low power, low cost, and easy to deploy underwater optical communication system capable of being operated at long distances. Optical modem-based communication offer high data rate, omni-directional spatial communication in the visual spectrum. The omni-directional aspect of communication is advantageous because precise alignment of communication units may not be required. The optical modems may be deployed via unmanned underwater vehicles (UUVs) and physically connected by tethers.
    Type: Grant
    Filed: January 5, 2012
    Date of Patent: February 10, 2015
    Assignee: Woods Hole Oceanographic Institution
    Inventors: Casey Machado, Lee Freitag, Andy Bowen, Norman E. Farr
  • Publication number: 20120170935
    Abstract: The systems and methods described herein provide a reconfigurable, long-range, optical modem-based underwater communication network. In particular, the network provides a low power, low cost, and easy to deploy underwater optical communication system capable of being operated at long distances. Optical modem-based communication offer high data rate, omni-directional spatial communication in the visual spectrum. The omni-directional aspect of communication is advantageous because precise alignment of communication units may not be required. The optical modems may be deployed via unmanned underwater vehicles (UUVs) and physically connected by tethers.
    Type: Application
    Filed: January 5, 2012
    Publication date: July 5, 2012
    Applicant: WOODS HOLE OCEANOGRAPHIC INSTITUTION
    Inventors: Casey Machado, Lee Freitag, Andy Bowen, Norman E. Farr
  • Publication number: 20110229141
    Abstract: The systems and methods of the invention provide for improved underwater communication systems. In particular, the systems and methods of the invention provide for improved underwater optical modems including optical transmitters and optical receivers that allow omni-directional transmission and reception of optical signals underwater and having a range of about 100 m and allowing data rates greater than 1 Mbit/s. The systems and methods of the invention also provide for underwater communication networks having a plurality of optical modems communicating with each other.
    Type: Application
    Filed: May 27, 2011
    Publication date: September 22, 2011
    Applicant: WOODS HOLE OCEANOGRAPHIC
    Inventors: Alan D. Chave, Norman E. Farr, Lee Freitag, James Preisig, Dana R. Yoerger, Sheri N. White
  • Patent number: 7953326
    Abstract: The systems and methods of the invention provide for improved underwater communication systems. In particular, the systems and methods of the invention provide for improved underwater optical modems including optical transmitters and optical receivers that allow omni-directional transmission and reception of optical signals underwater and having a range of about 100 m and allowing data rates greater than 1 Mbit/s. The systems and methods of the invention also provide for underwater communication networks having a plurality of optical modems communicating with each other.
    Type: Grant
    Filed: February 6, 2006
    Date of Patent: May 31, 2011
    Assignee: Woods Hole Oceanographic Institution
    Inventors: Norman E. Farr, Lee Freitag, James Preisig, Dana R. Yoerger, Sheri N. White, Alan D. Chave
  • Patent number: 7859944
    Abstract: Advantageous OFDM-based underwater acoustic (UWA) apparatus, systems and methods are provided according to the present disclosure. In general, OFDM transmissions over UWA channels encounter frequency-dependent Doppler drifts that destroy the orthogonality among OFDM subcarriers. The disclosed apparatus, systems, and methods use a two-step approach to mitigate frequency-dependent Doppler drifts for zero-padded OFDM transmissions over fast-varying channels: (1) non-uniform Doppler compensation via resampling to convert a “wideband” problem into a “narrowband” problem; and (2) high-resolution uniform compensation on the residual Doppler. The disclosed apparatus, systems and methods are based on block-by-block processing and do not rely on channel dependence across OFDM blocks. Thus, the disclosed apparatus, systems and methods are advantageously applicable for fast-varying UWA channels.
    Type: Grant
    Filed: June 18, 2008
    Date of Patent: December 28, 2010
    Assignees: Massachusetts Institute of Technology, University of Connecticut, Woods Hole Oceanographic Institution
    Inventors: Shengli Zhou, Baosheng Li, Peter Willett, Milica Stojanovic, Lee Freitag
  • Publication number: 20090129204
    Abstract: Advantageous OFDM-based underwater acoustic (UWA) apparatus, systems and methods are provided according to the present disclosure. In general, OFDM transmissions over UWA channels encounter frequency-dependent Doppler drifts that destroy the orthogonality among OFDM subcarriers. The disclosed apparatus, systems, and methods use a two-step approach to mitigate frequency-dependent Doppler drifts for zero-padded OFDM transmissions over fast-varying channels: (1) non-uniform Doppler compensation via resampling to convert a “wideband” problem into a “narrowband” problem; and (2) high-resolution uniform compensation on the residual Doppler. The disclosed apparatus, systems and methods are based on block-by-block processing and do not rely on channel dependence across OFDM blocks. Thus, the disclosed apparatus, systems and methods are advantageously applicable for fast-varying UWA channels.
    Type: Application
    Filed: June 18, 2008
    Publication date: May 21, 2009
    Applicant: University of Connecticut
    Inventors: Shengli Zhou, Baosheng Li, Peter Willett, Milica Stojanovic, Lee Freitag
  • Publication number: 20070183782
    Abstract: The systems and methods of the invention provide for improved underwater communication systems. In particular, the systems and methods of the invention provide for improved underwater optical modems including optical transmitters and optical receivers that allow omni-directional transmission and reception of optical signals underwater and having a range of about 100 m and allowing data rates greater than 1 Mbit/s. The systems and methods of the invention also provide for underwater communication networks having a plurality of optical modems communicating with each other.
    Type: Application
    Filed: February 6, 2006
    Publication date: August 9, 2007
    Applicant: WOODS HOLE OCEANOGRAPHIC INSTITUTION
    Inventors: Norman E. Farr, Lee Freitag, James Preisig, Dana R. Yoerger, Sheri N. White, Alan D. Chave