Patents by Inventor Brent R. Petersen

Brent R. Petersen 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).

  • Cellular telephone location system
    Patent number: 6246861
    Abstract: Apparatus for locating a mobile phone in a cellular phone system, in which the cellular phone system comprises plural base stations, each base station being associated with a cell, and in which the mobile phone is programmed to communicate signal strength of received signals to the base stations. Each base station, has a processing unit operably connected to the plural base stations by first communications links, the processing unit having as input the received signal strength measurements, the processing unit being programmed to operate upon the received signal strength measurements to solve a channel model equation in which the position of the mobile phone and the path loss exponent of the cell are unknowns and produce as output position location signals representing the position of the mobile phone in the cell, and a user interface operably connected to the processing unit by a second communication link for communicating signals indicative of the position of the mobile phone in the cell.
    Type: Grant
    Filed: April 9, 1998
    Date of Patent: June 12, 2001
    Assignee: Telecommunications Research Lab.
    Inventors: Geoffrey G. Messier, Brent R. Petersen, Michel Fattouche
  • Duplex decision feedback equalization system
    Patent number: 6031866
    Abstract: A system for equalization of two-way digital communications between a base and portable unit is described. Equalization is implemented in a manner so as to reduce the complexity of the portable unit. The reverse link (portable to base transmission) is equalized by a decision feedback equalizer (DFE). The forward link (base to portable) is equalized by an asymmetric decision feedback equalizer (ADFE), which consists of a forward filter located at the transmitter, and a decision feedback filter at the receiver.
    Type: Grant
    Filed: May 30, 1997
    Date of Patent: February 29, 2000
    Assignee: Telecommunications Research Laboratories
    Inventors: Kevin S. Oler, Brent R. Petersen, Abu B. Sesay
  • Method and apparatus for multiuser-interference reduction
    Patent number: 5761237
    Abstract: The present invention concerns an apparatus and method for reducing the multiuser-interference of input signals. The apparatus in accordance with the present invention comprises a multivariate predictor (81) and a decision quantizer (82), said multivariate predictor (81) operating on interference signals .eta.'(D) provided by means for extracting interference signals (83), said interference signals .eta.'(D) being obtained from said input signals and output signals b(D) which are available at an output of said decision quantizer (82) and fed back from there to said means for extracting interference signals (83).
    Type: Grant
    Filed: June 27, 1996
    Date of Patent: June 2, 1998
    Assignee: International Business Machines Corporation
    Inventors: Brent R. Petersen, Eleftheriou Evangelos