Patents by Inventor John Proakis

John Proakis 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).

  • Publication number: 20050100052
    Abstract: In the method and apparatus for receiver processing of CDMA signals, linear equalization of at least one received signal is followed by non-linear symbol estimation of each symbol stream in the received signal. An approximation of the original received signal formed from the estimated symbol streams is then filtered. The output from this filtering is combined with output from filtering of the received signal to produce the receiver processed received signal.
    Type: Application
    Filed: November 10, 2003
    Publication date: May 12, 2005
    Inventors: Laurence Mailaender, John Proakis
  • Patent number: 6819630
    Abstract: The present invention provides a receiver for underwater acoustic telemetry which combines a decision feedback adaptive equalizer structure with a modified turbo-equalizer structure. The modified turbo-equalizer structure is of significantly reduced complexity because the decision feedback adaptive equalizer structure is operable to process a plurality of data channels to provide a single symbol data output stream for application to the input of the modified turbo-equalizer which uses a decision feedback equalized, interleaver, deinterleaver and a decoder. Either a hard viterbi decorder for single iteration processing or a soft in/soft out decorder such as a MAP decoder for multiple iteration can be used. The iteration provide improved performance compared to a normal DFE and lower complexity compared to the traditional turbo-equalizer.
    Type: Grant
    Filed: September 18, 2003
    Date of Patent: November 16, 2004
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Fletcher A. Blackmon, Mohanadreza M. Hagh, John Proakis, Masoud Salehi