The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 20, 2008
Filed:
Nov. 08, 2002
John H. Oates, Amherst, NH (US);
Steven R. Imperiali, Townsend, MA (US);
Alden J. Fuchs, Nashua, NH (US);
Kathleen J. Jacques, Somerville, MA (US);
Jonathan E. Greene, Great Barrington, MA (US);
William J. Jenkins, Leominster, MA (US);
Frank P. Lauginiger, Francestown, NH (US);
David E. Majchrzak, Merrimack, NH (US);
Paul E. Cantrell, Chelmsford, MA (US);
Mizra Cifric, Jamaica Plain, MA (US);
Ian N. Dunn, Providence, RI (US);
Michael J. Vinskus, Litchfield, NH (US);
John H. Oates, Amherst, NH (US);
Steven R. Imperiali, Townsend, MA (US);
Alden J. Fuchs, Nashua, NH (US);
Kathleen J. Jacques, Somerville, MA (US);
Jonathan E. Greene, Great Barrington, MA (US);
William J. Jenkins, Leominster, MA (US);
Frank P. Lauginiger, Francestown, NH (US);
David E. Majchrzak, Merrimack, NH (US);
Paul E. Cantrell, Chelmsford, MA (US);
Mizra Cifric, Jamaica Plain, MA (US);
Ian N. Dunn, Providence, RI (US);
Michael J. Vinskus, Litchfield, NH (US);
Mercury Computer Systems, Inc., Chelmsford, MA (US);
Abstract
The invention provides methods and apparatus for multiple user detection (MUD) processing. One aspect of the invention provides a multiprocessor, multiuser detection system for detecting user transmitted symbols in CDMA short-code spectrum waveforms. A first processing element generates a matrix (hereinafter, 'gamma matrix') that represents a correlation between a short-code associated with one user and those associated with one or more other users. A set of second processing elements generates, e.g., from the gamma matrix, a matrix (hereinafter, 'R-matrix') that represents cross-correlations among user waveforms based on their amplitudes and time lags. A third processing element produces estimates of the user transmitted symbols as a function of the R-matrix.