Patents by Inventor Paul R. Milligan

Paul R. Milligan 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).

  • Multicode spread spectrum communications system
    Patent number: 6320897
    Abstract: MultiCode Spread Spectrum (MCSS) is a modulation scheme that assigns a number N of Spread Spectrum (SS) codes to an individual user where the number of chips per SS code is M. When viewed as Direct Sequence Spread Spectrum, MCSS requires up to N correlators (or equivalently up to N Matched Filters) at the receiver with a complexity of the order of NM operations. In addition, a non ideal communication channel can cause InterCode Interference (ICI), i.e. interference between the N SS codes. In this patent, we introduce three new types of MCSS. MCSS Type I allows the information in a MCSS signal to be detected using a sequence of partial corrrelations with a combined complexity of the order of M operations. MCSS Type II allows the information in a MCSS signal to be detected in a sequence of low complexity parallel operations which reduce the ICI.
    Type: Grant
    Filed: September 3, 1999
    Date of Patent: November 20, 2001
    Assignee: Wi-LAN Inc.
    Inventors: Michel T. Fattouche, Hatim Zaghloul, Paul R. Milligan, David L. Snell
  • Multicode spread spectrum communications system
    Patent number: 6192068
    Abstract: MultiCode Spread Spectrum (MCSS) is a modulation scheme that assigns a number N of Spread Spectrum (SS) codes to an individual user where the number of chips per SS code is M. When viewed as Direct Sequence Spread Spectrum, MCSS requires up to N correlators (or equivalently up to N Matched Filters) at the receiver with a complexity of the order of NM operations. In addition, a non ideal communication channel can cause InterCode Interference (ICI), i.e. interference between the N SS codes. In this patent, we introduce three new types of MCSS. MCSS Type I allows the information in a MCSS signal to be detected using a sequence of partial corrrelations with a combined complexity of the order of M operations. MCSS Type II allows the information in a MCSS signal to be detected in a sequence of low complexity parallel operations which reduce the ICI.
    Type: Grant
    Filed: October 3, 1996
    Date of Patent: February 20, 2001
    Assignee: Wi-Lan Inc.
    Inventors: Michel T. Fattouche, Hatim Zaghloul, Paul R. Milligan, David L. Snell