Patents by Inventor Arthur R. Hammons, Jr.

Arthur R. Hammons, Jr. 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).

  • Space-time codes for linearly labelled PAM, PSK, QAM and related constellations using gray mapping
    Patent number: 7675990
    Abstract: General algebraic space-time code constructions are presented for Gray-mapped 2K-PSK, 2K-PAM, and 4K-QAM constellations. The space-time codes achieve the rate-diversity tradeoff—i.e., they allow the transmission of information at the maximum rate possible for the given signaling constellation and the achieved transmit diversity level. New codes created by applying a nonsingular linear or affine transformation to the constellation labels retain the optimality of the original codes with respect to the rate-diversity tradeoff. Extensions to pK-PSK, pK-PAM, p2K-QAM, and related constellations, for p prime, are also given.
    Type: Grant
    Filed: October 24, 2006
    Date of Patent: March 9, 2010
    Assignee: The Johns Hopkins University
    Inventor: Arthur R. Hammons, Jr.
  • Method and construction for space-time codes for AM-PSK constellations
    Patent number: 7471742
    Abstract: Space-time codes are developed for multi-radii AM-PSK constellations. Further, a “super-unified” space-time code construction is developed that incorporates multi-radii AM-PSK codes with the Lu-Kumar unified codes. The multi-radii space-time codes achieve the rate-diversity tradeoff—that is, the codes transmits information at the maximum rate possible for the given signaling constellation and the achieved transmit diversity level.
    Type: Grant
    Filed: March 30, 2005
    Date of Patent: December 30, 2008
    Assignee: The Johns Hopkins University
    Inventor: Arthur R. Hammons, Jr.