Patents by Inventor Arogyaswami Joseph Paulraj

Arogyaswami Joseph Paulraj 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).

  • Method and apparatus for adaptive transmission beam forming in a wireless communication system
    Patent number: 7286855
    Abstract: A method for forming an adaptive phased array transmission beam pattern at a base station without any knowledge of array geometry or mobile feedback is described. The approach is immune to the problems which plague methods which attempt to identify received angles of arrival from the mobile and map this information to an optimum transmit beam pattern. In addition, this approach does not suffer the capacity penalty and mobile handset complexity increase associated with mobile feedback. Estimates of the receive vector propagation channels are used to estimate transmit vector channel covariance matrices which form objectives and constraints in quadratic optimization problems leading to optimum beam former solutions for the single user case, and multiple user case. The new invention in capable of substantial frequency re-use capacity improvement in a multiple user cellular network.
    Type: Grant
    Filed: October 16, 2003
    Date of Patent: October 23, 2007
    Assignees: The Board of Trustees of the Leland Stanford Jr. University, Cisco Technology, Inc.
    Inventors: Gregory Gene Raleigh, Suhas Nagraj Diggavi, Vincent Knowles Jones, IV, Arogyaswami Joseph Paulraj
  • Method and apparatus for adaptive transmission beam forming in a wireless communication system
    Publication number: 20040157646
    Abstract: A method for forming an adaptive phased array transmission beam pattern at a base station without any knowledge of array geometry or mobile feedback is described. The approach is immune to the problems which plague methods which attempt to identify received angles of arrival from the mobile and map this information to an optimum transmit beam pattern. In addition, this approach does not suffer the capacity penalty and mobile handset complexity increase associated with mobile feedback. Estimates of the receive vector propagation channels are used to estimate transmit vector channel covariance matrices which form objectives and constraints in quadratic optimization problems leading to optimum beam former solutions for the single user case, and multiple user case. The new invention in capable of substantial frequency re-use capacity improvement in a multiple user cellular network.
    Type: Application
    Filed: October 16, 2003
    Publication date: August 12, 2004
    Inventors: Gregory Gene Raleigh, Suhas Nagraj Diggavi, Vincent Knowles Jones, Arogyaswami Joseph Paulraj
  • Method and apparatus for adaptive transmission beam forming in a wireless communication system
    Patent number: 6665545
    Abstract: A method for forming an adaptive phased array transmission beam pattern at a base station without any knowledge of array geometry or mobile feedback is described. The approach is immune to the problems which plague methods which attempt to identify received angles of arrival from the mobile and map this information to an optimum transmit beam pattern. In addition, this approach does not suffer the capacity penalty and mobile handset complexity increase associated with mobile feedback. Estimates of the receive vector propagation channels are used to estimate transmit vector channel covariance matrices which form objectives and constraints in quadratic optimization problems leading to optimum beam former solutions for the single user case, and multiple user case. The new invention in capable of substantial frequency re-use capacity improvement in a multiple user cellular network.
    Type: Grant
    Filed: May 2, 2000
    Date of Patent: December 16, 2003
    Assignees: The Board of Trustees of the Leland Stanford Jr. University, Cisco Technology Inc.
    Inventors: Gregory Gene Raleigh, Suhas Nagraj Diggavi, Vincent Knowles Jones, IV, Arogyaswami Joseph Paulraj
  • Adaptive beam forming for transmitter operation in a wireless communication system
    Patent number: 6101399
    Abstract: A method for forming an adaptive phased array transmission beam pattern at a base station without any knowledge of array geometry or mobile feedback is described. The approach is immune to the problems which plague methods which attempt to identify received angles of arrival from the mobile and map this information to an optimum transmit beam pattern. In addition, this approach does not suffer the capacity penalty and mobile handset complexity increase associated with mobile feedback. Estimates of the receive vector propagation channels are used to estimate transmit vector channel covariance matrices which form objectives and constraints in quadratic optimization problems leading to optimum beam former solutions for the single user case, and multiple user case. The new invention in capable of substantial frequency re-use capacity improvement in a multiple user cellular network.
    Type: Grant
    Filed: June 16, 1995
    Date of Patent: August 8, 2000
    Assignees: The Board of Trustees of the Leland Stanford Jr. University, Cisco Technology, Inc.
    Inventors: Gregory Gene Raleigh, Suhas Nagraj Diggavi, Vincent Knowles Jones, IV, Arogyaswami Joseph Paulraj