Luis A Nunez

US Patent:

6407694, Jun 18, 2002

Filed:

Jun 14, 2000

Appl. No.:

09/593203

Inventors:

Lloyd C. Cox - Tucson AZ
Gary A. Gramlich - Oro Valley AZ
Robert M. Baker - Simi Valley CA
Stephen Freeman - Tucson AZ
Brian P. Neary - Marcellus NY
Cynthia R. Krzemien - Tucson AZ
Jordan A. Krim - Longmont CO
Luis R. Nunez - Tucson AZ

Assignee:

Raytheon Company - Lexington MA

International Classification:

H04N 521

US Classification:

342 13

Abstract:

A versatile signal processor. The inventive signal processor includes a plurality of filters which are selectively interconnected to provide a variety of digital signal processing functions. In the illustrative embodiment, each filter is adapted to multiply input data by a coefficient. Further, each filter includes adders for accumulating the products. The coefficients are provided by an external processor which configures the general purpose filter to a particular function, such as a general purpose filter, a Hilbert filter, a finite impulse response filter, an equalizer, a beamforming network, a convolver, a correlator, or an application specific integrated circuit by way of example. When interconnected in accordance with the teachings provided herein, these circuits may be used to provide a digital receiver.

US Patent:

6411253, Jun 25, 2002

Filed:

Jun 14, 2000

Appl. No.:

09/593202

Inventors:

Lloyd C. Cox - Tucson AZ
Gary A. Gramlich - Oro Valley AZ
Robert M. Baker - Simi Valley CA
Stephen Freeman - Tucson AZ
Brian P. Neary - Marcellus NY
Cynthia R. Krzemien - Tucson AZ
Jordan A. Krim - Longmont CO
Luis R. Nunez - Tucson AZ

Assignee:

Raytheon Company - Lexington MA

International Classification:

H04N 521

US Classification:

342194, 342 13

Abstract:

An equalization system and method. In a most general sense, the inventive equalization system includes first and second filters for filtering an in-phase component of a received signal in accordance with first and second sets of coefficients, respectively. The system includes third and fourth filters for filtering a quadrature component of the input signal in accordance with third and fourth sets of coefficients, respectively. The outputs of the first and third filters are subtracted to provide an equalized in-phase output signal and the outputs of the second and fourth filters are added to provide an equalized quadrature output signal. In the illustrative embodiment the filters are finite impulse response filters and the coefficients are provided by a microprocessor. In accordance with the present teachings, the filters are implemented in a general purpose filter. The delay elements of the filters are calculated in accordance with a mean square error algorithm.

US Patent:

63174677, Nov 13, 2001

Filed:

Jun 14, 2000

Appl. No.:

9/593480

Inventors:

Lloyd C. Cox - Tucson AZ
Gary A. Gramlich - Oro Valley AZ
Robert M. Baker - Simi Valley CA
Stephen Freeman - Tucson AZ
Brian P. Neary - Marcellus NY
Cynthia R. Krzemien - Tucson AZ
Jordan A. Krim - Longmont CO
Luis R. Nunez - Tucson AZ

International Classification:

H04B 702
H04L 102

US Classification:

375267

Abstract:

A beamforming system including a multiplier stage for providing a plurality of steered signal terms, each term being a product of an input signal term and a steering signal term. A filter multiplies the steered signal terms by a plurality of respective filter weights to provide a plurality of weighted products. The weighted products are summed to provide an output beam directionally responsive to the steering signal. A microprocessor provides the steering signal terms and the filter weights in response to the input signal and/or user input. In the preferred embodiment, the filter is a reconfigurable, general purpose matched filter configured to multiply a plurality of delayed representations of a respective one of the steered signal terms by a plurality of the weights to provide a plurality of intermediate weighted product terms. The filter further includes a summing circuit for accumulating the intermediate weighted product terms to provide a respective one of the plurality of weighted products. The inventive beamforming system cancels unwanted interference, while forming a beam to allow a desired signal to be received with a maximum signal-to-interference-plus-noise ratio (SINR).