Chun Wai Lee

US Patent:

6727512, Apr 27, 2004

Filed:

Nov 5, 2002

Appl. No.:

10/289005

Inventors:

Stan Stokowski - Danville CA
Damon F. Kvamme - San Jose CA
Chun Shen Lee - Cupertino CA
Donald W. Pettibone - San Jose CA

Assignee:

KLA-Tencor Technologies Corporation - Milpitas CA

International Classification:

G01B 902

US Classification:

25055945, 348125

Abstract:

Provided are apparatus and methods for detecting phase defects. The invention relies generally on the distortion of light as it passes through defects in phase shift masks to detect these defects. Light traveling through a defect, such as a bump in an etched area will travel at a different angle than light traveling through air. In order to enhance the signals generated from the defects, the invention in several embodiments provides a multiple element detector having at least four elements, arranged in a radially symmetric configuration. Individual elements of the detector are selected to form a differential signal based on the configuration of pattern lines in the area proximate to the defect. The resulting differential signal is used to generate an image signal and to identify phase defects.

US Patent:

7926959, Apr 19, 2011

Filed:

Mar 31, 2008

Appl. No.:

12/060050

Inventors:

Damon Kvamme - Los Gatos CA, US
David Alles - Los Altos CA, US
Chun Lee - Cupertino CA, US
Wu Jiang - Sunnyvale CA, US

Assignee:

KLA-Tencor Corporation - Milpitas CA

International Classification:

G02B 5/122

US Classification:

359529

Abstract:

Methods and apparatus relating to electromagnetic beam (e. g. , laser beam) conditioning are described. In an embodiment, electromagnetic beam conditioning may be performed utilizing reflectors to temporally differentiate electromagnetic beam subsections and sub-beams resulting in reduced spatial coherence of the beam. Other embodiments are also described.

US Patent:

8000411, Aug 16, 2011

Filed:

Jan 4, 2008

Appl. No.:

11/969857

Inventors:

Jong Hyeon Park - San Jose CA, US
Bok Tae Sim - San Ramon CA, US
Je Woo Kim - Cupertino CA, US
Serguei A. Glazko - San Diego CA, US
Sameer Nanavati - Fremont CA, US
Ju Won Park - San Ramon CA, US
Chun Woo Lee - San Ramon CA, US
Tae Ryun Chang - Santa Clara CA, US

Assignee:

Qualcomm Incorporated - San Diego CA

International Classification:

H03K 9/00
H04L 27/00

US Classification:

375316, 375260, 375324, 375340, 375349

Abstract:

A method and apparatus for decoding encoded data bits of a wireless communication transmission are provided. A set of a-priori bit values corresponding to known bit values of the encoded data bits may be generated. Decoding paths that correspond to decoded data bits that are inconsistent with the a-priori bit values may be removed from the possible decoding paths to consider, and decoding the encoded data bits by selecting a decoding path from remaining decoding paths of the possible decoding paths that were not removed. Multiple hypotheses, each corresponding to a different set of a-prior bit values may be evaluated, with the decoded data for a hypothesis selected based on the evaluation output for further processing.

US Patent:

8259866, Sep 4, 2012

Filed:

Jan 4, 2008

Appl. No.:

11/969724

Inventors:

Tae Ryun Chang - Santa Clara CA, US
Jong Hyeon Park - San Jose CA, US
Ju Won Park - San Ramon CA, US
Bok Tae Sim - San Ramon CA, US
Chun Woo Lee - San Ramon CA, US
Je Woo Kim - Cupertino CA, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H03D 1/00
H04L 27/06

US Classification:

375341, 375262, 375265, 375324, 375340

Abstract:

A method and apparatus for decoding encoded data bits of a wireless communication transmission are provided. A set of a-priori bit values corresponding to known bit values of the encoded data bits may be generated. Decoding paths that correspond to decoded data bits that are inconsistent with the a-priori bit values may be removed from the possible decoding paths to consider, and decoding the encoded data bits by selecting a decoding path from remaining decoding paths of the possible decoding paths that were not removed.

US Patent:

8374286, Feb 12, 2013

Filed:

Jun 19, 2008

Appl. No.:

12/142770

Inventors:

Chun Woo Lee - San Ramon CA, US
Jong Hyeon Park - San Jose CA, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H03K 9/00
H04L 27/00

US Classification:

375316, 455130

Abstract:

A method and apparatus for decoding encoded data bits of a wireless communication transmission are provided. A set of a-priori bit values corresponding to known bit values of a response message expected to be transmitted in response to a previously transmitted message. Example expected response messages include clear to send (CTS) messages transmitted in response to request to send (RTS) messages and positive acknowledgement (ACK) messages transmitted in response to messages with data payloads.

US Patent:

8392811, Mar 5, 2013

Filed:

Jan 7, 2008

Appl. No.:

11/970373

Inventors:

Chun Woo Lee - San Ramon CA, US
Jong Hyeon Park - San Jose CA, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H03M 13/00
H03M 13/03
H04L 27/06

US Classification:

714799, 714795, 714794, 714792, 714811, 375341

Abstract:

A method and apparatus for decoding encoded data bits of a wireless communication transmission are provided. A set of a-priori bit values corresponding to known bit values of the encoded data bits may be generated. Decoding paths that correspond to decoded data bits that are inconsistent with the a-priori bit values may be removed from the possible decoding paths to consider, and decoding the encoded data bits by selecting a decoding path from remaining decoding paths of the possible decoding paths that were not removed. A-priori bit values may be extracted from various messages, such as DL-MAP, UL-MAP, RNG-REQ, and BW-REQ messages.

US Patent:

8406342, Mar 26, 2013

Filed:

Jun 19, 2008

Appl. No.:

12/142770

Inventors:

Chun Woo Lee - San Ramon CA, US
Jong Hyeon Park - San Jose CA, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H03K 9/00
H04L 27/00

US Classification:

375316, 455130

Abstract:

A method and apparatus for decoding encoded data bits of a wireless communication transmission are provided. A set of a-priori bit values corresponding to known bit values of a response message expected to be transmitted in response to a previously transmitted message. Example expected response messages include clear to send (CTS) messages transmitted in response to request to send (RTS) messages and positive acknowledgement (ACK) messages transmitted in response to messages with data payloads.

US Patent:

8411638, Apr 2, 2013

Filed:

Jun 23, 2008

Appl. No.:

12/144586

Inventors:

Chun Woo Lee - San Ramon CA, US
Shan Qing - San Diego CA, US
Tom Chin - San Diego CA, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H04W 4/00

US Classification:

370331, 455438

Abstract:

Certain embodiments provide techniques for background scanning in a wireless communication device receiving signals from multiple base stations using a background scanning processor separate from a receive processor. The techniques generally include buffering raw signal data from multiple base stations, forwarding the raw signal data to a receive baseband processor for decoding data from a first one of the base stations that is currently designated as a serving base station with an active connection to the wireless communications device, forwarding the raw signal data to a background scanning processor, separate from the receive baseband processor, and generating channel characteristics corresponding to the multiple base stations with the background scanning processor without interrupting the exchange of data with the first base station designated as the serving base station.