Patents by Inventor Denis Jacques Ullmo

Denis Jacques Ullmo 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: 6678525
    Abstract: Techniques for predicting RF signal propagation in indoor environments are disclosed. A typical technique comprises six distinct phases. In one phase, the mean wall separation, {overscore (d)}, of one floor of a building is estimated. In a second phase, a reflection coefficient, s, is estimated for the floor in general. In a third phase, a number of trial RF propagation measurements are made to gather empirical data about the RF propagation characteristics of the floor.
    Type: Grant
    Filed: May 30, 2000
    Date of Patent: January 13, 2004
    Assignee: Lucent Technologies Inc.
    Inventors: Harold Urey Baranger, Denis Jacques Ullmo
  • Patent number: 6119009
    Abstract: Techniques for predicting RF signal propagation in indoor environments are disclosed. A typical technique comprises six distinct phases. In one phase, the mean wall separation, d, of one floor of a building is estimated. In a second phase, a reflection coefficient, s, is estimated for the floor in general. In a third phase, a number of trial RF propagation measurements are made to gather empirical data about the RF propagation characteristics of the floor. In the fourth phase, the mean wall separation, d, the reflection coefficient, s, and the trial RF propagation measurements are fit, using well-known techniques, into a wireless propagation model, such as ##EQU1## where P(r) is the measured or predicted power at a distance, r, from the transmitter, ##EQU2## and .xi. is the parameter that is fit to the empirical data.
    Type: Grant
    Filed: September 18, 1997
    Date of Patent: September 12, 2000
    Assignee: Lucent Technologies, Inc.
    Inventors: Harold Urey Baranger, Denis Jacques Ullmo