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

• US 7,327,780 B2
• Filed: 03/14/2002
• Issued: 02/05/2008
• Est. Priority Date: 03/14/2001
• Status: Expired due to Fees

• Current Assignee: Mercury Systems, Incorporated
• Original Assignee: Mercury Computer Systems Incorporated
• Inventors: Jacques, Kathleen J., Dunn, Ian N., Jenkins, William J., Lauginiger, Frank P., Cantrell, Paul E., Oates, John H., Fuchs, Alden J., Imperiali, Steven R., Vinskus, Michael J., Cifric, Mirza, Greene, Jonathan E., Majchrzak, David E.
• Primary Examiner(s): Odom; Curtis B.
• Application Number:
  US10/099,918
• Publication Number:
  US 20030128739A1
• Time in Patent Office: 2,154 Days
• Field of Search: 375/150
• US Class Current: 375/150
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 1/7093 Matched filter type
• CPC Class Codes: H04B 1/7105 Joint detection techniques, e.g. linear detectors
• CPC Class Codes: H04B 1/71052 using decorrelation matrix
• CPC Class Codes: H04B 1/71075 Parallel interference cancellation
• CPC Class Codes: H04B 1/7115 Constructive combining of multi-path signals, i.e. RAKE receivers
• CPC Class Codes: H04B 2201/70707 Efficiency-related aspects
• CPC Class Codes: H04B 2201/70711 with modular structure

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.

Claims

1. A communications device for detecting user transmitted symbols encoded in spread spectrum waveforms (“

user waveforms”

) comprising

a first operating system supporting execution of a first process corresponding to a first set of communication tasks for detecting user transmitted symbols encoded in the user waveforms,

a second operating system supporting execution of a second process corresponding to a second set of communication tasks for detecting user transmitted symbols encoded in the user waveforms, where the first and second operating systems differ,

a protocol translator coupled to the first and second processes and translating communications in between,

the first process sending to the second process via the protocol translator a set of executable instructions for performing at least a portion of said second set of communication tasks,

wherein the second process generates a matrix as a result of executing the set of instructions.

2. The device of claim 1, wherein the matrix represents any of a correlation of code sequences for the user waveforms, a cross-correlation of the user waveforms based on time-lags and complex amplitudes, and estimates of user transmitted symbols embedded in the user waveforms.

3. The device of claim 2, wherein the second process routes said matrix to one or more memories and devices based on a configuration specified by the first process.

4. The device of claim 1, wherein the first process sends via the protocol translator information to the second process for configuration thereof.

5. The device of claim 4, wherein the information comprises a routing map.

6. The device of claim 5, wherein the second process routes a result of executing the set of instructions based on the routing map.

7. The device of claim 6, wherein the second process generates the matrix as the result of executing the set of instructions.

8. The device of claim 7, wherein the matrix represents any of a correlation of code sequences for the user waveforms, a cross-correlation of the user waveforms based on time-lags and complex amplitudes, and estimates of user transmitted symbols embedded in the user waveforms.

9. A communications device for detecting user transmitted symbols encoded in spread spectrum waveforms (“

user waveforms”

) comprising

a first operating system supporting execution of a first process corresponding to a first set of communication tasks for detecting user transmitted symbols encoded in the user waveforms,

a second operating system supporting execution of a plurality of second processes corresponding to a respective-second set of communication tasks for detecting user transmitted symbols encoded in the user waveforms, where the first and second operating systems differ,

a protocol translator coupled to the first and second processes and translating communications in between,

the first process sending to each second process via the protocol translator a set of executable instructions for performing a respective portion of a common task,

wherein the first process sends to each of the second processes via the protocol translator instructions for generating a respective portion of a matrix.

10. The device of claim 9, wherein the first process sends to each of the second processes via the protocol translator instructions for generation of the portion of a matrix representing any of a correlation of code sequences for the user waveforms, a portion of a cross-correlation of the user waveforms based on time-lags and complex amplitudes, and estimates of user transmitted symbols embedded in the user waveforms.

11. The device of claim 9, wherein the first process sends via the protocol translator to each second process information for configuration thereof.

12. The device of claim 11, wherein the each of the second processes routes its respective portion of a matrix to one or more memories and devices based on the information from the first process.

13. The device of claim 11, wherein the first process monitors an operational status of each of the second processes and generates the information for configuration thereof based thereon.

14. The device of claim 11, wherein the first process monitors an operational status of each of the second processes and generates the set of executable instructions thereof based thereon.