Michael B Mccloud

US Patent:

7623602, Nov 24, 2009

Filed:

Aug 25, 2006

Appl. No.:

11/509920

Inventors:

Tommy Guess - Lafayette CO, US
Michael L McCloud - Boulder CO, US

Assignee:

Tensorcomm, Inc. - Greenwood CO

International Classification:

H04B 7/10

US Classification:

375347

Abstract:

An interference-canceling receiver processes coded, multiple-access, spread-spectrum transmissions that propagate through frequency-selective communication channels from multiple transmit antennas to multiple receive antennas in a closed-loop transmit-diversity channel. The receiver provides for repeated use of symbol-estimate weighting, subtractive cancellation with a stabilizing step-size, and mixed-decision symbol estimation. Receivers may be designed, adapted, and implemented explicitly in software or programmed hardware, or implicitly in standard Rake-based hardware, either within a Rake receiver at the finger level or outside the Rake at the user or subchannel symbol level. The receiver may be employed in user equipment on the forward link or in a base station on the reverse link.

US Patent:

7702048, Apr 20, 2010

Filed:

Jun 13, 2006

Appl. No.:

11/451688

Inventors:

Tommy Guess - Lafayette CO, US
Michael L McCloud - Boulder CO, US
Vijay Nagarajan - Boulder CO, US
Gagandeep Singh Lamba - Thornton CO, US

Assignee:

Tensorcomm, Incorporated - Westminster CO

International Classification:

H03D 1/04

US Classification:

375346

Abstract:

A receiver is configured for canceling intra-cell and inter-cell interference in coded, multiple-access, spread-spectrum transmissions that propagate through frequency-selective communication channels. The receiver employs iterative symbol-estimate weighting, subtractive cancellation with a stabilizing step-size, and mixed-decision symbol estimates. Receiver embodiments may be implemented explicitly in software or programmed hardware, or implicitly in standard Rake-based hardware either within the Rake (i. e. , at the finger level) or outside the Rake (i. e. , at the user or subchannel symbol level).

US Patent:

7711075, May 4, 2010

Filed:

Jun 13, 2006

Appl. No.:

11/451932

Inventors:

Tommy Guess - Lafayette CO, US
Michael L McCloud - Boulder CO, US
Vijay Nagarajan - Boulder CO, US
Gagandeep Singh Lamba - Thornton CO, US

Assignee:

Tensorcomm Incorporated - Westminster CO

International Classification:

H03D 1/04

US Classification:

375346

Abstract:

A receiver is configured for canceling intra-cell and inter-cell interference in coded, multiple-access, spread-spectrum transmissions that propagate through frequency-selective communication channels. The receiver employs iterative symbol-estimate weighting, subtractive cancellation with a stabilizing step-size, and mixed-decision symbol estimates. Receiver embodiments may be implemented explicitly in software or programmed hardware, or implicitly in standard Rake-based hardware either within the Rake (i. e. , at the finger level) or outside the Rake (i. e. , at the user or subchannel symbol level).

US Patent:

7715508, May 11, 2010

Filed:

Jun 13, 2006

Appl. No.:

11/452027

Inventors:

Tommy Guess - Lafayette CO, US
Michael L McCloud - Boulder CO, US
Vijay Nagarajan - Boulder CO, US
Gagandeep Singh Lamba - Thornton CO, US

Assignee:

Tensorcomm, Incorporated - Westminster CO

International Classification:

H03D 1/04

US Classification:

375346

Abstract:

A receiver is configured for canceling intra-cell and inter-cell interference in coded, multiple-access, spread-spectrum transmissions that propagate through frequency-selective communication channels. The receiver employs iterative symbol-estimate weighting, subtractive cancellation with a stabilizing step-size, and mixed-decision symbol estimates. Receiver embodiments may be implemented explicitly in software or programmed hardware, or implicitly in standard Rake-based hardware either within the Rake (i. e. , at the finger level) or outside the Rake (i. e. , at the user or subchannel symbol level).

US Patent:

7733941, Jun 8, 2010

Filed:

Jun 29, 2006

Appl. No.:

11/479401

Inventors:

Michael L McCloud - Boulder CO, US
Tommy Guess - Lafayette CO, US

Assignee:

Rambus, Inc. - Los Altos CA

International Classification:

H04B 1/00
H04B 1/10
H04L 1/00

US Classification:

375148, 375144, 375233, 375346

Abstract:

An interference-canceling receiver is configured for cancelling inter-symbol interference due to both inter- and intra-channel interference in coded, multiple-access, spread spectrum transmissions that propagate through frequency-selective communication channels. The receiver mitigates the effects of post-cursor inter-symbol interference using feedback of previously estimated symbols, and mitigates pre-cursor inter-symbol interference using an interference canceller, such as an iterative interference canceller.

US Patent:

7808937, Oct 5, 2010

Filed:

Nov 10, 2005

Appl. No.:

11/272411

Inventors:

Michael L McCloud - Boulder CO, US
Vijay Nagarajan - Boulder CO, US

Assignee:

Rambus, Inc. - Los Altos CA

International Classification:

H04B 3/20

US Classification:

370286, 370335, 375148, 375285, 375316, 375340, 375349

Abstract:

An interference canceller comprises a composite interference vector (CIV) generator configured to produce a CIV by combining soft and/or hard estimates of interference, an interference-cancelling operator configured for generating a soft-projection operator, and a soft-projection canceller configured for performing a soft projection of the received baseband signal to output an interference-cancelled signal. Weights used in the soft-projection operator are selected to maximize a post-processing SINR.

US Patent:

7826516, Nov 2, 2010

Filed:

Jul 24, 2006

Appl. No.:

11/491674

Inventors:

Tommy Guess - Lafayette CO, US
Michael L McCloud - Boulder CO, US
Vijay Nagarajan - Boulder CO, US
Gagandeep Singh Lamba - Thornton CO, US

Assignee:

Rambus Inc. - Los Altos CA

International Classification:

H04B 1/10
H04B 7/02
H04L 1/02

US Classification:

375148, 375144, 375267, 375349

Abstract:

This invention teaches to the details of an interference canceling receiver for canceling intra-cell and inter-cell interference in coded, multiple-access, spread spectrum transmissions that propagate through frequency selective communication channels to a multiplicity of receive antennas. The receiver is designed or adapted through the repeated use of symbol-estimate weighting, subtractive cancellation with a stabilizing step-size, and mixed-decision symbol estimates. Receiver embodiments may be designed, adapted, and implemented explicitly in software or programmed hardware, or implicitly in standard RAKE-based hardware either within the RAKE (i. e. , at the finger level) or outside the RAKE (i. e. , at the user or subchannel symbol level). Embodiments may be employed in user equipment on the forward link or in a base station on the reverse link.

US Patent:

7876810, Jan 25, 2011

Filed:

Nov 4, 2005

Appl. No.:

11/266928

Inventors:

Michael L McCloud - Boulder CO, US
Vijay Nagarajan - Boulder CO, US

Assignee:

Rambus Inc. - Sunnyvale CA

International Classification:

H04B 1/00

US Classification:

375148, 375254, 375278, 375285, 370310, 370347

Abstract:

Interference is cancelled from a baseband signal by synthesizing interference from estimated symbols in interfering subchannels. The estimated symbols are hard-coded, soft weighted, or zeroed, depending on the value of an estimated pre-processed signal-to-interference-and-noise ratio (SINR) in each subchannel in order to maximize a post-processed SINR. The estimated pre-processed SINR is obtained from averages of estimated symbol energies and estimated noise variances, or from related statistical procedures.