Patents by Inventor Carl Erik Joakim Langlet

Carl Erik Joakim Langlet 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).

  • Radio communication system with diversity reception on a time-slot by time-slot basis
    Patent number: 5991282
    Abstract: A communication system base station improves uplink coverage on a time slot by time slot basis. The coverage is improved by allocating diversity and non-diversity time-slots based on received signal quality of an RF link between a mobile station and a base station. The diversity time-slots are time slots during which information is received by more receiver branches than during the non-diversity time-slots.
    Type: Grant
    Filed: May 28, 1997
    Date of Patent: November 23, 1999
    Assignee: Telefonaktiebolaget LM Ericsson
    Inventors: Carl Erik Joakim Langlet, Bo Anders Granstrom
  • Radio communication system selectively using multicast with variable offset time
    Patent number: 5930248
    Abstract: A digital base station improves downlink coverage by allocating multicast and non-multicast channels based on the propagation property of an RF link between a mobile unit and a base station. The non-multicast channels are time slots during which information is transmitted from one antenna, and multicast channels are time slots during which information is transmitted from multiple diversity antennas. Transmission timing is offset from the diversity antennas by an amount that corresponds to the multipath propagation properties of the RF link.
    Type: Grant
    Filed: March 4, 1997
    Date of Patent: July 27, 1999
    Assignee: Telefonaktiebolaget LM Ericsson
    Inventors: Carl Erik Joakim Langlet, Bo Anders Granstrom
  • Compensation of long term oscillator drift using signals from distant hydrogen clouds
    Patent number: 5847613
    Abstract: A method and apparatus for compensating for the long term drift of an oscillator. Signals from hydrogen clouds are received and processed to generate an adjustment signal, which is used to adjust the frequency of the oscillator. The adjustment signal is derived from a frequency spectrum midpoint estimated from the signal strength of the received signals.
    Type: Grant
    Filed: June 18, 1997
    Date of Patent: December 8, 1998
    Assignee: Telefonaktiebolaget LM Ericsson
    Inventors: Carl Erik Joakim Langlet, Nils Bertil Noren