Patents by Inventor Jianzhong (Charlie) Zhang

Jianzhong (Charlie) Zhang 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).

  • Patent number: 7551664
    Abstract: A system, terminal, receiver and method are provided for receiving and processing a signal received from a spread-spectrum downlink channel. The method includes receiving the signal from the downlink channel, and generating an estimate of a transmitted chip sequence in accordance with an iterative process. In this regard, the iterative process includes calculating statistical information, such as a mean and covariance, for a previous iteration of a transmitted chip sequence, the statistical information being selectively calculated based upon one of soft bits and soft symbols associated with the previous iteration of the transmitted chip sequence. The estimate for a current iteration of the chip sequence is then generated based upon the statistical information.
    Type: Grant
    Filed: September 17, 2004
    Date of Patent: June 23, 2009
    Assignee: Nokia Corporation
    Inventors: Jianzhong (Charlie) Zhang, Hoang Nguyen, Giridhar Mandyam, Joe Dowling
  • Patent number: 7545875
    Abstract: A method for space-time-frequency coding pieces of data includes receiving a stream of a plurality of pieces of data in a multi-antenna transmission system, where the data may comprise a stream of orthogonal frequency division multiple access (OFDMA) symbols, orthogonal frequency division multiplexed (OFDM) symbols or the like. The pieces of data are then coded across space, time and frequency dimensions based upon a plurality of space-time-frequency (STF) codes. The pieces of data are coded such that one or more STF codes in the frequency dimension differ from one or more other STF codes in the frequency dimension. In this regard, the frequency dimension can include a plurality of frequency bins such that the pieces of data can be coded in a manner whereby the plurality of STF codes sequentially circulates through sets of at least one frequency bin in the frequency domain.
    Type: Grant
    Filed: August 29, 2005
    Date of Patent: June 9, 2009
    Assignee: Nokia Corporation
    Inventors: Jianzhong (Charlie) Zhang, Kiran Kuchi, Ari Hottinen
  • Publication number: 20060093057
    Abstract: A method for space-time-frequency coding pieces of data includes receiving a stream of a plurality of pieces of data in a multi-antenna transmission system, where the data may comprise a stream of orthogonal frequency division multiple access (OFDMA) symbols, orthogonal frequency division multiplexed (OFDM) symbols or the like. The pieces of data are then coded across space, time and frequency dimensions based upon a plurality of space-time-frequency (STF) codes. The pieces of data are coded such that one or more STF codes in the frequency dimension differ from one or more other STF codes in the frequency dimension. In this regard, the frequency dimension can include a plurality of frequency bins such that the pieces of data can be coded in a manner whereby the plurality of STF codes sequentially circulates through sets of at least one frequency bin in the frequency domain.
    Type: Application
    Filed: August 29, 2005
    Publication date: May 4, 2006
    Applicant: Nokia Corporation
    Inventors: Jianzhong (Charlie) Zhang, Kiran Kuchi, Ari Hottinen