Patents by Inventor Thomas A. Courtade

Thomas A. Courtade 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).

  • Secure group key agreement for wireless networks
    Patent number: 9084112
    Abstract: A method for secure key agreement among a subset of a plurality of transceivers includes generating a first ordered subset of a plurality of keys k?j, where j=0 to S. Each of the subset of the plurality of transceivers may possess at least one of the plurality of keys k?j from the first ordered subset. Each of the subset of the plurality of transceivers possessing one or more keys k?i, i=1 to S, also possesses at least one key from a second ordered subset of the plurality of keys k?j, j=0 to i?1. A key with index ?0 is designated as a group key. A binary sum of the group key k?0 and a key k?j, where j?0, is transmitted from one or more of the subset of the plurality of transceivers that possesses the group key k?0.
    Type: Grant
    Filed: October 14, 2013
    Date of Patent: July 14, 2015
    Assignee: TrellisWare Technologies, Inc.
    Inventors: Thomas R. Halford, Thomas A. Courtade, Keith M. Chugg
  • SECURE GROUP KEY AGREEMENT FOR WIRELESS NETWORKS
    Publication number: 20150104017
    Abstract: A method for secure key agreement among a subset of a plurality of transceivers includes generating a first ordered subset of a plurality of keys k?j, where j=0 to S. Each of the subset of the plurality of transceivers may possess at least one of the plurality of keys k?j from the first ordered subset. Each of the subset of the plurality of transceivers possessing one or more keys k?i, i=1 to S, also possesses at least one key from a second ordered subset of the plurality of keys k?j, j=0 to i?1. A key with index ?0 is designated as a group key. A binary sum of the group key k?0 and a key k?j, where j?0, is transmitted from one or more of the subset of the plurality of transceivers that possesses the group key k?0.
    Type: Application
    Filed: October 14, 2013
    Publication date: April 16, 2015
    Applicant: TrellisWare Technologies, Inc.
    Inventors: Thomas R. Halford, Thomas A. Courtade, Keith M. Chugg
  • Digital beamforming method and apparatus for pointing and null steering without calibration or calculation of covariance matrix
    Patent number: 7570211
    Abstract: The method and system provides an improvement in signal to noise plus interference without utilizing a calculated covariance matrix or calibrated antenna array, and does not require knowledge of the array geometry. The system utilizes the cross correlation of the output of each antenna element to estimate a weight vector for resolving a signal in a multiple simultaneous source environment.
    Type: Grant
    Filed: March 25, 2008
    Date of Patent: August 4, 2009
    Assignee: Rockwell Collins, Inc.
    Inventors: Dana J. Jensen, Thomas A. Courtade
  • Method for efficiently computing the beamforming weights for a large antenna array
    Patent number: 7414578
    Abstract: A method of determining the size of a sub-array for an antenna array is described. The method includes choosing a number of elements of a sub-array of antenna elements. Further, the method includes determining a direction of arrival of the signal using data from the sub-array. The method also includes computing weights for the antenna array. Further still, the method includes determining whether the size of the sub-array meets a predetermined criteria.
    Type: Grant
    Filed: September 27, 2006
    Date of Patent: August 19, 2008
    Assignee: Rockwell Collins, Inc.
    Inventors: Thomas A. Courtade, Dana J. Jensen