Patents by Inventor Tomas Backstrom

Tomas Backstrom 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).

  • Telecommunications systems
    Patent number: 6147983
    Abstract: A base station comprises a plurality of transceivers, one of which normally performs verifications, but is able to handle traffic channels at time of high demand. When it is desired to block one transceiver, for example for maintenance purposes, calls allocated to that transceiver can be handed off to other transceivers before the device is fully blocked.
    Type: Grant
    Filed: December 22, 1997
    Date of Patent: November 14, 2000
    Assignee: Telefonaktiebolaget LM Ericsson
    Inventor: Tomas Backstrom
  • Equalizer training in a radiotelephone system
    Patent number: 5297169
    Abstract: Reception of a transmission in a radiotelephone system including an equalizer is improved by training the equalizer using a synchronization portion of the transmission having a data pattern chosen for its correlation properties and retraining the equalizer using a portion of the transmission transmitted for a different purpose. In particular, the portion of the transmission transmitted for a different purpose may be the digital verification color code transmitted during each burst in a digital cellular mobile radiotelephone system. Reception quality is increased by training the equalizer at more frequent intervals without increasing transmission overhead.
    Type: Grant
    Filed: June 28, 1991
    Date of Patent: March 22, 1994
    Assignee: Telefonaktiebolaget L M Ericsson
    Inventors: Tomas Backstrom, Torbjorn Ward, Gustav Larsson
  • Split-window time alignment
    Patent number: 5229996
    Abstract: Synchronization is maintained between a regional radio transmitter/receiver and a remote transmitter/receiver communicating across a TDMA channel by detecting time misalignment of communications from the remote transmitter/receiver to the regional transmitter/receiver, commanding the remote transmitter/receiver to adjust its transmission timing, and, until the remote transmitter/receiver has adjusted its transmission timing, looking for a synchronization pattern accompanying transmissions by the remoter transmitter/receiver during two discontinuous time intervals, one centered about a time of occurrence of the synchronization pattern before the command and another centered about an expected time of occurrence of the synchronization pattern in response to the command. Effectively, what would otherwise be a disadvantageously wide time window is split into two advantageously narrow time windows to avoid detection of false syncs. Fewer false syncs are detected, and speech quality is increased.
    Type: Grant
    Filed: July 21, 1992
    Date of Patent: July 20, 1993
    Assignee: Telefonaktiebolaget L M Ericsson
    Inventors: Tomas Backstrom, Anders Sandell, Peter Wahlstrom