Patents by Inventor Angela Doufexi

Angela Doufexi 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).

  • Communications systems
    Patent number: 7680199
    Abstract: In a multi user communication system, subcarriers are allocated to subchannels using a quality measurement for each subchannel. An initial sub carrier is allocated to each subchannel, and a quality metric measured. Subsequent subcarriers are allocated in dependence upon the quality measurement for each subchannel. The subchannel with the lowest quality measurement receives the first allocation, and the subchannel with the highest quality measurement receives the last allocation. The subsequent allocation is repeated, following a re-sort of the subchannel quality measurements, until all of the subcarriers are allocated.
    Type: Grant
    Filed: July 29, 2005
    Date of Patent: March 16, 2010
    Assignee: Kyocera Corporation
    Inventors: Simon Armour, Angela Doufexi, Joseph Mc Geertvaw
  • OBTAINING CHANNEL FEEDBACK FROM USERS IN A WIRELESS COMMUNICATION SYSTEM
    Publication number: 20090109911
    Abstract: Subchannel feedback is provided from a plurality of mobile devices to a base station in a communication system, in which a channel is divided into available subchannels. The base station first requests channel information from the mobile devices, and then receives the channel information, for example in the form of an average Effective Signal to Noise Ratio for the channel. Based on the received channel information, the base station selects a subset of the mobile devices, i.e. the best mobile devices. The base station then requests subchannel information relating to a subset of the available subchannels, from the selected subset of the mobile devices, and receives the subchannel information in the form of information identifying said subset of the available subchannels, without indicting a quality of said subset of the available subchannels.
    Type: Application
    Filed: October 22, 2008
    Publication date: April 30, 2009
    Applicant: The University of Bristol
    Inventors: Marios Nicolaou, Angela Doufexi, Simon Armour
  • Communications systems
    Publication number: 20060126749
    Abstract: In a multi user communication system, subcarriers are allocated to subchannels using a quality measurement for each subchannel. An initial sub carrier is allocated to each subchannel, and a quality metric measured. Subsequent subcarriers are allocated in dependence upon the quality measurement for each subchannel. The subchannel with the lowest quality measurement receives the first allocation, and the subchannel with the highest quality measurement receives the last allocation. The subsequent allocation is repeated, following a re-sort of the subchannel quality measurements, until all of the subcarriers are allocated.
    Type: Application
    Filed: July 29, 2005
    Publication date: June 15, 2006
    Inventors: Simon Armour, Angela Doufexi, Joseph Geertvaw