Wireless communications systems and methods for multiple operating system multiple user detection

US7327780B2 · kind B2 · utility

Assignee

• MERCURY COMPUTER SYSTEMS, INC. · US

Inventors

• John H. Oates · Thomasville, US
• Steven R. Imperiali · Endwell, US
• Alden Fuchs · Leesburg, US
• Kathleen J. Jacques · Somerville, US
• Jonathan E. Greene · Great Barrington, US
• William J. Jenkins · Leominster, US
• Frank P. Lauginiger · Francestown, US
• David E. Majchrzak · Merrimack, US
• Paul E. Cantrell · Chelmsford, US
• Mirza Cifric · Brookline, US
• Ian Dunn · Providence, US
• Michael J. Vinskus · Litchfield, US

Key dates

• Filing date: Mar 14, 2002
• Grant date: Feb 5, 2008
• Expiry date: Aug 29, 2024

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04B2201/70711
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

The invention provides methods and apparatus for multiple user detection (MUD) processing that have application, for example, in improving the capacity CDMA and other wireless base stations. 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.