Patents by Inventor Jafar Rostamy

Jafar Rostamy 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).

  • Method and apparatus for eliminating audio clicks in a radio receiver
    Patent number: 6771721
    Abstract: A radio receiver improves audio quality by eliminating the audio clicks caused by fading conditions. The receiver detects the presence of the fading condition based on a large phase variation of a faded received signal during a time interval. When a fading condition is detected, the radio receiver reduces the large phase variation associated with the received signal to eliminate the audio clicks.
    Type: Grant
    Filed: June 20, 1997
    Date of Patent: August 3, 2004
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Jafar Rostamy, Aref Darvish
  • Method and apparatus for measuring signal quality in a wireless communication system
    Patent number: 6330431
    Abstract: A method is described of measuring the burst quality of a received signal. Specifically, the impairment correlation matrix, used to provide an estimate of impairment correlation properties for use in demodulating radio signals received by a plurality of antennas, is used to obtain the parameters necessary to obtain measurements of the burst quality, with respect to the signal to noise ratio and the signal to interferer ratio respectively. Specific algorithms for calculating the burst quality are also disclosed.
    Type: Grant
    Filed: July 8, 1998
    Date of Patent: December 11, 2001
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Jafar Rostamy, Peter Wahlström
  • Radio channel squelching systems
    Patent number: 5970399
    Abstract: Detection of in-band noise in a radio communications voice channel is provided by mixing a signal having a known frequency into a radio signal containing a voice channel signal in an in-band range, thereby translating the voice channel signal out of the in-band range. The in-band range is thereafter examined for the presence of noise signal energy whose presence can be indicative of in-band noise. Squelching of the voice channel is provided in the event that in-band noise energy exceeds a predetermined threshold.
    Type: Grant
    Filed: November 22, 1995
    Date of Patent: October 19, 1999
    Assignee: Telefonaktiebolaget LM Ericsson
    Inventors: Jafar Rostamy, Johan von Perner, Anders Engman