Patents Assigned to Sirius Communications N.V.
  • Method and system for code division multiple access communication with increased capacity through self-noise reduction
    Patent number: 6639902
    Abstract: A method and system for constructing orthogonal codes of length N for use in a network utilizing quasi-synchronous code division multiple access combined with time division duplexing. The method determines the balanced vectors of length N, being all possible cross-correlation vectors resulting from zero cross-correlation of codes of length N. An arbitrary code of length N is utilized, and a bitwise XOR-ing is performed with all the balanced vectors to produce a set of codes with which the arbitrary code is orthogonal. A bitwise XOR-ing of the original balanced vectors is performed and the code is added to a set of orthogonal codes if the result of the bitwise XOR-ing of the original balanced vectors is balanced. The method is repeated until the set of orthogonal codes is complete.
    Type: Grant
    Filed: November 27, 2001
    Date of Patent: October 28, 2003
    Assignee: Sirius Communications N.V.
    Inventors: Jan Mennekens, Carl Mertens, Lieven Philips, Jurgen Vandermot, Jan Vanhoof
  • Method and apparatus for code division multiple access communication with increased capacity through self-noise reduction
    Patent number: 6324159
    Abstract: A method of generating a waveform with a plurality of orthogonal PN codes for use in a communications network utilizing quasi-synchronous code division multiple access. The orthogonal PN codes modulate multiple data streams together with a non-orthogonal PN code having desirable auto-correlation properties. The result is a complex signal with time-aligned PN codes.
    Type: Grant
    Filed: May 6, 1999
    Date of Patent: November 27, 2001
    Assignee: Sirius Communications N.V.
    Inventors: Jan Mennekens, Carl Mertens, Lieven Philips, Jurgen Vandermot, Jan Vanhoof