Patents by Inventor Tomas Stolt

Tomas Stolt 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).

  • Adaptive modulation scheme for multipath wireless channels
    Patent number: 8902725
    Abstract: A modulation method for data packets transmitted on a mobile communication channel, the method comprising a first linear modulation mode, to be used when the radio conditions are good, and a second constant envelop modulation mode, to be used when the radio conditions are poor. Since a constant envelope-modulated signal is degraded more when time dispersion occurs, the first linear modulation mode is also used when the time dispersion is severe.
    Type: Grant
    Filed: July 2, 2007
    Date of Patent: December 2, 2014
    Assignee: Unwired Planet, LLC
    Inventors: Tomas Stolt, Bo Hedberg
  • Adaptive Modulation Scheme for Multipath Wireless Channels
    Publication number: 20100208602
    Abstract: A modulation method for data packets transmitted on a mobile communication channel, the method comprising a first linear modulation mode, to be used when the radio conditions are good, and a second constant envelop modulation mode, to be used when the radio conditions are poor. Since a constant envelope-modulated signal is degraded more when time dispersion occurs, the first linear modulation mode is also used when the time dispersion is severe.
    Type: Application
    Filed: July 2, 2007
    Publication date: August 19, 2010
    Applicant: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Tomas Stolt, Bo Hedberg
  • Method and apparatus for providing downlink power control in radio communication systems employing virtual cells
    Patent number: 6735451
    Abstract: Methods and base stations for controlling downlink power, especially in systems employing virtual cells, are described. By providing attenuators in each transmit signal processing chain, e.g., after upconverting to intermediate frequencies, downlink power control can be more finely tuned to different antenna elements.
    Type: Grant
    Filed: November 9, 2000
    Date of Patent: May 11, 2004
    Assignee: Telefonaktlebolaget LM Ericsson (publ)
    Inventors: Anders Järleholm, Johan Jansson, Tomas Stolt
  • Communication receiver having reduced dynamic range by reducing the fixed range of the amplifier and increasing the variable gain via a gain control circuit
    Patent number: 6678509
    Abstract: An apparatus for use in a receiver in a communication system in which signals cover a wide range of power levels. The apparatus provides reduced power consumption without sacrificing receiver sensitivity by using an amplifier having a fixed, relatively narrow dynamic range that can by selectively positioned to accommodate the wide range of power levels. The amplifier is placed earlier in the receiver signal processing chain than comparable amplifiers in conventional receivers.
    Type: Grant
    Filed: October 15, 2001
    Date of Patent: January 13, 2004
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Karin Skarman, Tomas Stolt, Anders Järleholm
  • Methods and arrangement relating to a radio communication network
    Patent number: 6650876
    Abstract: The present invention is related to a terrestrial cellular radio communication network comprising at least a first base station (BS1) in which a common set of multi carrier power amplifiers (409-412) are used to amplify radio signals transmitted by the first base station (BS1) in different cells. The invention enables reductions in the total maximum output power the first base station (BS1) needs to support when downlink power control functions, such as power control or discontinuous transmission, and/or Adaptive Channel Allocation are applied in the cells served by the first base station (BS1).
    Type: Grant
    Filed: August 10, 2000
    Date of Patent: November 18, 2003
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Thomas Östman, Tomas Stolt, Ceylon Utterborn
  • Communication receiver having reduced dynamic range by reducing the fixed range of the amplifier and increasing the variable gain via a gain control circuit
    Publication number: 20020068540
    Abstract: An apparatus for use in a receiver in a communication system in which signals cover a wide range of power levels. The apparatus provides reduced power consumption without sacrificing receiver sensitivity by using an amplifier having a fixed, relatively narrow dynamic range that can by selectively positioned to accommodate the wide range of power levels. The amplifier is placed earlier in the receiver signal processing chain than comparable amplifiers in conventional receivers.
    Type: Application
    Filed: October 15, 2001
    Publication date: June 6, 2002
    Inventors: Karin Skarman, Tomas Stolt, Anders Jarleholm