Jeffrey D Gilbert

US Patent:

6530887, Mar 11, 2003

Filed:

Nov 26, 1999

Appl. No.:

09/449780

Inventors:

Jeffrey M. Gilbert - El Cerrito CA
Alice M. Chiang - Weston MA
Steven R. Broadstone - Woburn MA
Gary Madison - Lexington MA
Albert Horst - Westford MA
Liang-Min Wang - Northboro MA

Assignee:

TeraTech Corporation - Burlington MA

International Classification:

A61B 800

US Classification:

600459

Abstract:

A hand-held ultrasound probe system includes integrated electronics within an ergonomic housing. The electronics includes control circuitry, beamforming and circuitry transducer drive circuitry. The probe electronics communicates with a host computer using an industry standard high speed serial bus.

US Patent:

6671227, Dec 30, 2003

Filed:

Aug 2, 2001

Appl. No.:

09/921976

Inventors:

Jeffrey M. Gilbert - El Cerrito CA
Alice M. Chiang - Weston MA
Steven R. Broadstone - Woburn MA

Assignee:

TeraTech Corporation - Burlington MA

International Classification:

G03B 4206

US Classification:

367138

Abstract:

A multidimensional beamforming device that performs consecutive one-dimensional operations. For example, beamsteering for a two-dimensional array can be include a projection of a beam onto each of the respective axes of the array. In such a device, a first beamforming processing element is used to form multiple beams for each array output along a given row. In a preferred embodiment, sequential output vectors from the first processing element are then applied to a transposing or corner turning memory and the data are reformatted such that all elements on a given column of the array are applied to a second beam forming processing element.

US Patent:

6869401, Mar 22, 2005

Filed:

Aug 23, 2002

Appl. No.:

10/227187

Inventors:

Jeffrey M. Gilbert - El Cerrito CA, US
Alice M. Chiang - Weston MA, US
Steven R. Broadstone - Woburn MA, US
Gary Madison - Lexington MA, US
Albert Horst - Westford MA, US

Assignee:

Teratech Corporation - Burlington MA

International Classification:

A61B008/00

US Classification:

600459

Abstract:

A hand-held ultrasound system includes integrated electronics within an ergonomic housing. The electronics includes control circuitry, beamforming and circuitry transducer drive circuitry. The electronics communicate with a host computer using an industry standard high speed serial bus.

US Patent:

7039004, May 2, 2006

Filed:

Oct 1, 2002

Appl. No.:

10/263415

Inventors:

Qinfang Sun - Cupertino CA, US
Won-Joon Choi - San Jose CA, US
Jeffrey M. Gilbert - Sunnyvale CA, US
Ning Zhang - Milpitas CA, US
Yi-Hsiu Wang - Palo Alto CA, US

Assignee:

Atheros Communications, Inc. - Santa Clara CA

International Classification:

H04J 11/00

US Classification:

370208, 370343, 375232, 375340

Abstract:

Current OFDM systems use a limited number of symbols and/or sub-channels to provide approximations for channel estimations and pilot tracking, i. e. phase estimations. For example, two training symbols in the preamble of a data packet are used to provide channel estimation. Four of the fifty-four sub-channels are reserved for providing phase estimation. However, noise and other imperfections can cause errors in both of these estimations, thereby degrading system performance. Advantageously, decision feedback mechanisms can be provided to significantly improve channel estimation and pilot tracking in OFDM systems. The decision feedback mechanisms can use data symbols in the data packet to improve channel estimation as well as data sub-channels to improve pilot tracking.

US Patent:

7088787, Aug 8, 2006

Filed:

Sep 24, 2001

Appl. No.:

09/962912

Inventors:

Jeffrey M. Gilbert - Sunnyvale CA, US

Assignee:

Atheros Communications, Inc. - Santa Clara CA

International Classification:

H03K 9/00
H04L 27/06
H04L 27/14
H04L 27/22

US Classification:

375316, 375344, 370210

Abstract:

A method of scaling at a receiver representations of training signals received from a transmitter. The method includes producing a frequency domain representation of at least one long training symbol received at the receiver and a frequency domain representation of a data symbol, and scaling the frequency domain representation of the at least one long symbol based on a largest coefficient in the frequency domain representation to produce a scaled frequency domain representation of the at least one long symbol.

US Patent:

7113559, Sep 26, 2006

Filed:

Sep 24, 2001

Appl. No.:

09/962842

Inventors:

Bevan M. Baas - Mountain View CA, US
Jeffrey M. Gilbert - Sunnyvale CA, US
William J. McFarland - Los Altos CA, US
Teresa H. Meng - Portola Valley CA, US
Ardavan Maleki Tehrani - Los Altos CA, US

Assignee:

Atheros Communications, Inc. - Santa Clara CA

International Classification:

H04B 1/10

US Classification:

375350, 375229, 375285, 708300

Abstract:

A circular filtering system that prevents the problem of inter-symbol interference. The circular filtering system utilizes a buffer memory to store samples of a given symbol and provide only these samples to a linear filter such that the output of the filter, for any given symbol is formed by filtering only samples of that input symbol. Each symbol being filtered independent of other symbols hence eliminating inter-symbol interference caused by filtering. Where symbols are tolerant to a fixed phase shift for each symbol, the circular filtering system can be simplified by reducing the size of the buffer and introducing a multiplexer.

US Patent:

7123670, Oct 17, 2006

Filed:

Sep 24, 2001

Appl. No.:

09/963115

Inventors:

Jeffrey M. Gilbert - Sunnyvale CA, US
Teresa H. Meng - Portola Valley CA, US
John Thomson - Santa Clara CA, US

Assignee:

Atheros Communications, Inc. - Santa Clara CA

International Classification:

H04L 27/06

US Classification:

375344, 4551922

Abstract:

A method for correcting influence of frequency offset between a receiver and a transmitter by evaluating training symbols received during a preamble period. The method includes producing, based on at least one long training symbol, a first vector whose first vector angle is indicative of a fine offset between the receiver and the transmitter, producing a fine offset estimate based on the first vector angle, and multiplying, with a signal having a frequency based upon the fine offset estimate, data symbols that are received after the at least one long training symbol is received.

US Patent:

7129884, Oct 31, 2006

Filed:

Jul 1, 2004

Appl. No.:

10/884785

Inventors:

Ardavan Maleki Tehrani - Menlo Park CA, US
Xiaoru Zhang - Sunnyvale CA, US
Paul J. Husted - San Jose CA, US
Jeffrey M. Gilbert - Sunnyvale CA, US

Assignee:

Atheros Communications, Inc. - Santa Clara CA

International Classification:

G01S 7/40
G01S 7/285
G01S 7/35
G01S 13/00

US Classification:

342 20, 342 13, 342 52, 342 58, 342 89, 342175, 342195

Abstract:

A radar detection technique in a WLAN device can include a short pulse detection technique and a long pulse detection technique that can be performed using multiple receive chains. Short pulse detection is particularly effective when the incoming signal includes one or a limited number of main pulses and some residual pulses. In contrast, long pulse detection is particularly effective when the incoming signal is longer, thereby allowing various characteristics of the incoming signal to be accurately measured.