Patents by Inventor Lars Peter Wahlstrom

Lars Peter Wahlstrom 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).

  • Reducing interference in telecommunications systems
    Patent number: 6516199
    Abstract: A cellular network is controlled such that time slots of transmissions from base stations with the same operating frequency are synchronized. Moreover, adjacent base stations using the same frequency are controlled such that, at any given time, they are transmitting different sync words.
    Type: Grant
    Filed: December 22, 1997
    Date of Patent: February 4, 2003
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Jan Erik Söderkvist, Lars Peter Wahlström
  • Telecommunications systems
    Patent number: 6295290
    Abstract: A base station monitors signals received from cochannel interferers, and detects the air frame positions of the interfering transmissions. The base station then adjusts the air frame position of its own transmissions such that it minimizes the possibility of interference with the cochannel interferers.
    Type: Grant
    Filed: December 22, 1997
    Date of Patent: September 25, 2001
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Jan Erik Söderkvist, Lars Peter Wahlström
  • Signal-to-noise ratio determination using digital signal processing
    Patent number: 6181739
    Abstract: Methods and systems for measuring signal noise of supervisory audio tones (SATs) in radiocommunication systems are disclosed. Exemplary embodiments involve extracting a real component from a received SAT signal, removing the SAT signal portion and examining the remainder to determine a noise component present in the SAT. The noise component can be compared with a signal strength measurement to obtain a signal-to-noise ratio.
    Type: Grant
    Filed: November 22, 1995
    Date of Patent: January 30, 2001
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Omar Ryde, Olof Tomas Backström, Lars Peter Wahlström
  • Supervisory audio tone (SAT) approximation in an analog cellular mobile radio telephone system
    Patent number: 5878342
    Abstract: Methods and systems for estimating Supervisory Audio Tone (SAT) strength during data transfer and for a short time period thereafter. The SAT during this period is regarded as being identical to the strength measured just before the data transfer was started. In an alternative embodiment, a probabilistic algorithm can be used wherein previous measurements are used to predict the SAT strength during and for a period after data transfer. Where the present invention is used in a mobile radio telecommunications system of the type in which analog information is transmitted between at least one base station and a number of mobile stations, a method for supervising the quality of a connection between the base station and a mobile station includes transmitting data between the base station and the mobile station during which a SAT is not transmitted and using pre-data transfer SAT measurement for radio transmission quality supervision during at least a time period of said data transmitting step.
    Type: Grant
    Filed: December 15, 1995
    Date of Patent: March 2, 1999
    Assignee: Telefonaktiebolaget LM Ericsson
    Inventors: Karl Fredrik Robert Gustafson, Sven Gunnar Johnny Lidfors, Jan-Erik Lundberg, Lars Peter Wahlstrom