Patents by Inventor Alexandre Mallette

Alexandre Mallette 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).

  • Channel estimation in a rake receiver of a CDMA communication system
    Patent number: 7428262
    Abstract: A method and apparatus for channel estimation in a rake receiver of a CDMA communication system operates with a finite-impulse-response channel estimation filter with L taps and having a fixed delay. A pilot sequence of a received sequence of data from a channel of the communication system on the rake receiver is input. A quality of the channel of the communication system is determined using noise or Doppler measurements. These measurements are used in adjusting a bandwidth of the filter to accommodate the channel quality while keeping the fixed delay, which minimizes the delay buffer size. The filter is then used to operate on the received sequence of data to provide coherent modulation.
    Type: Grant
    Filed: August 13, 2003
    Date of Patent: September 23, 2008
    Assignee: Motorola, Inc.
    Inventors: Bryan W. Zancho, Christopher P. Larosa, Alexandre Mallette, John P. Oliver
  • Channel estimation in a rake receiver of a CDMA communication system
    Publication number: 20050036537
    Abstract: A method and apparatus for channel estimation in a rake receiver of a CDMA communication system operates with a finite-impulse-response channel estimation s filter with L taps and having a fixed delay. A pilot sequence of a received sequence of data from a channel of the communication system on the rake receiver is input. A quality of the channel of the communication system is determined using noise or Doppler measurements. These measurements are used in adjusting a bandwidth of the filter to accommodate the channel quality while keeping the fixed delay, which minimizes the delay buffer size. The filter is then used to operate on the received sequence of data to provide coherent modulation.
    Type: Application
    Filed: August 13, 2003
    Publication date: February 17, 2005
    Inventors: Bryan Zancho, Christopher Larosa, Alexandre Mallette, John Oliver
  • Methods and communications terminals for increasing capacity CDMA communications networks
    Patent number: 6661809
    Abstract: A method in a code division multiple access communication system having network infrastructure and a plurality of mobile terminals, including transmitting (210) composite signal comprising a synchronization signal and another non-orthogonal signal from the network infrastructure, receiving (220) the composite signal at the plurality of mobile terminals of the code division multiple access communication system, and increasing forward link capacity of the code division multiple access communication system by canceling (230) the synchronization signal from at least some of the plurality of mobile terminals.
    Type: Grant
    Filed: November 14, 2001
    Date of Patent: December 9, 2003
    Assignee: Motorola, Inc.
    Inventors: John Oliver, Alexandre Mallette, Mymy Nguyen
  • Doppler spread/velocity estimation in mobile wireless communication devices and methods therefor
    Patent number: 6636574
    Abstract: A method for estimating Doppler spread in mobile wireless communication devices, for example in CDMA or W-CDMA cellular communication systems, with improved noise immunity. The Doppler spread estimation is based on an estimated value of an autocorrelation or autocovariance at a first lag (210) and at a second lag (220), the magnitude of which is greater than the first lag. A first ratio is determined (250) between a first difference (230) and a second difference (240). The estimated Doppler spread is generally proportional to a square root (260) of the first ratio, and is scaled (270) by a multiplicative factor that depends on whether the estimated function is an autocorrelation or autocovariance function.
    Type: Grant
    Filed: May 31, 2001
    Date of Patent: October 21, 2003
    Assignee: Motorola, Inc.
    Inventors: Alexandre Mallette, John Paul Oliver
  • Methods and communications terminals for increasing capacity CDMA communications nerworks
    Publication number: 20030091018
    Abstract: A method in a code division multiple access communication system having network infrastructure and a plurality of mobile terminals, including transmitting (210) composite signal comprising a synchronization signal and another non-orthogonal signal from the network infrastructure, receiving (220) the composite signal at the plurality of mobile terminals of the code division multiple access communication system, and increasing forward link capacity of the code division multiple access communication system by canceling (230) the synchronization signal from at least some of the plurality of mobile terminals.
    Type: Application
    Filed: November 14, 2001
    Publication date: May 15, 2003
    Inventors: John Oliver, Alexandre Mallette, Mymy Nguyen
  • Doppler spread/velocity estimation in mobile wireless communication devices and methods therefor
    Publication number: 20020181553
    Abstract: A method for estimating Doppler spread in mobile wireless communication devices, for example in CDMA or W-CDMA cellular communication systems, with improved noise immunity. The Doppler spread estimation is based on an estimated value of an autocorrelation or autocovariance at a first lag (210) and at a second lag (220), the magnitude of which is greater than the first lag. A first ratio is determined (250) between a first difference (230) and a second difference (240). The estimated Doppler spread is generally proportional to a square root (260) of the first ratio, and is scaled (270) by a multiplicative factor that depends on whether the estimated function is an autocorrelation or autocovariance function.
    Type: Application
    Filed: May 31, 2001
    Publication date: December 5, 2002
    Inventors: Alexandre Mallette, John Paul Oliver