Patents by Inventor Mohammed Qaddi

Mohammed Qaddi 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 transmitting signals in a multi-antenna mobile communications system that compensates for channel variations
    Patent number: 7242724
    Abstract: A method is provided for transmitting signals from a transmitter comprising two or more antennas in a mobile telecommunications network. The method involves determining channel state information, estimating the reliability of that channel state information, and space time block encoding at least one data sequence. Before transmitting the data sequence, a linear transformation is applied to the data sequence so as to at least partially compensate for channel variations. The linear transformation is dependent upon the channel state information and upon the estimated reliability of the channel state information.
    Type: Grant
    Filed: July 16, 2003
    Date of Patent: July 10, 2007
    Assignee: Lucent Technologies Inc.
    Inventors: Angeliki Alexiou, Mohammed Qaddi
  • Linear transformation of symbols to at least partially compensate for correlation between antennas in space time block coded systems
    Patent number: 7197082
    Abstract: A method is provided of transmitting signals from two or more antennas in a wireless telecommunications network, in which at least one data sequence is space-time block encoded. Before transmitting the data sequence, a linear transformation is applied to the data sequence, the linear transformation being adapted to use knowledge of correlation among the antennas to at least partially compensate the transmitted signals for said correlation. The linear transformation depends on the eigenvalues of an antenna correlation matrix. The linear transformation further depends on a ratio of symbol energy (Es) to noise variance (?2). The method includes transmitting the encoded and transformed data sequence.
    Type: Grant
    Filed: March 20, 2003
    Date of Patent: March 27, 2007
    Assignee: Lucent Technologies Inc.
    Inventors: Angeliki Alexiou, Mohammed Qaddi
  • Method of compensating for correlation between multiple antennas
    Patent number: 7130580
    Abstract: A method is provided of transmitting signals from two or more antennas in a wireless telecommunications network, in which at least one data sequence is space-time block encoded. Before transmitting the data sequence, a linear transformation is applied to the data sequence, the linear transformation being adapted to use knowledge of correlation among the antennas to at least partially compensate the transmitted signals for said correlation. The linear transformation depends on the eigenvalues of an antenna correlation matrix. The linear transformation further depends on a ratio of symbol energy (ES) to noise variance (?2). The method includes transmitting the encoded and transformed data sequence.
    Type: Grant
    Filed: July 17, 2003
    Date of Patent: October 31, 2006
    Assignee: Lucent Technologies Inc.
    Inventors: Angeliki Alexiou, Mohammed Qaddi
  • Method and apparatus for transmitting signals in a multi-antenna mobile communications system that compensates for channel variations
    Publication number: 20050020237
    Abstract: A method is provided for transmitting signals from a transmitter comprising two or more antennas in a mobile telecommunications network. The method involves determining channel state information, estimating the reliability of that channel state information, and space time block encoding at least one data sequence. Before transmitting the data sequence, a linear transformation is applied to the data sequence so as to at least partially compensate for channel variations. The linear transformation is dependent upon the channel state information and upon the estimated reliability of the channel state information.
    Type: Application
    Filed: July 16, 2003
    Publication date: January 27, 2005
    Inventors: Angeliki Alexiou, Mohammed Qaddi
  • Method of compensating for correlation between multiple antennas
    Publication number: 20040185792
    Abstract: A method is provided of transmitting signals from two or more antennas in a wireless telecommunications network, in which at least one data sequence is space-time block encoded. Before transmitting the data sequence, a linear transformation is applied to the data sequence, the linear transformation being adapted to use knowledge of correlation among the antennas to at least partially compensate the transmitted signals for said correlation. The linear transformation depends on the eigenvalues of an antenna correlation matrix. The linear transformation further depends on a ratio of symbol energy (ES) to noise variance (&sgr;2). The method includes transmitting the encoded and transformed data sequence.
    Type: Application
    Filed: July 17, 2003
    Publication date: September 23, 2004
    Inventors: Angeliki Alexiou, Mohammed Qaddi
  • Linear transformation of symbols to at least partially compensate for correlation between antennas in space time block coded systems
    Publication number: 20040185909
    Abstract: A method is provided of transmitting signals from two or more antennas in a wireless telecommunications network, in which at least one data sequence is space-time block encoded. Before transmitting the data sequence, a linear transformation is applied to the data sequence, the linear transformation being adapted to use knowledge of correlation among the antennas to at least partially compensate the transmitted signals for said correlation. The linear transformation depends on the eigenvalues of an antenna correlation matrix. The linear transformation further depends on a ratio of symbol energy (Es) to noise variance (&sgr;2). The method includes transmitting the encoded and transformed data sequence.
    Type: Application
    Filed: March 20, 2003
    Publication date: September 23, 2004
    Inventors: Angeliki Alexiou, Mohammed Qaddi