Richard Y Chi

US Patent:

6983166, Jan 3, 2006

Filed:

Aug 20, 2001

Appl. No.:

09/933604

Inventors:

Serge Willenegger - Onnens, CH
Richard Chi - Santa Clara CA, US
Chih-Ping Hsu - San Diego CA, US

Assignee:

Qualcomm, Incorporated - San Diego CA

International Classification:

H04Q 7/20

US Classification:

455522, 455 69, 4551271, 370342

Abstract:

Techniques to more efficiently control the transmit power for a data transmission that uses a number of formats (e. g. , rates, transport formats). Different formats for a given data channel (e. g. , transport channel) may require different target SNIRs to achieved a particular BLER. In one aspect, individual target BLER may be specified for each format of each data channel. In another aspect, various power control schemes are provided to achieve different target SNIRs for different formats. In a first power control scheme, multiple individual outer loops are maintained for multiple formats. For each format, its associated outer loop attempts to set the target SNIR such that the target BLER specified for that format is achieved. In a second power control scheme, multiple individual outer loops are maintained and the base station further applies different adjustments to the transmit power levels for different formats.

US Patent:

7010321, Mar 7, 2006

Filed:

Feb 4, 2002

Appl. No.:

10/067608

Inventors:

Richard Chi - Temple City CA, US
Nitin Kasturi - Los Gatos CA, US

Assignee:

Qualcomm Inc. - San Diego CA

International Classification:

H04Q 7/20

US Classification:

455522, 455 134, 370318

Abstract:

Techniques for power control that avoids outer loop wind-up are disclosed. In one aspect, wind-up of a target power level is detected, and the target power level is modified in response. In another aspect, unwinding of the target power level is detected, after which the target power level is determined without considering wind-up. Various other aspects are also presented, including wind-up and unwinding detection procedures, and target power level modification procedures. These aspects have the benefit of reducing the time that transmit power exceeds that which is necessary, thus increasing system capacity and performance, and mitigating misallocation of system resources.

US Patent:

7035343, Apr 25, 2006

Filed:

Jan 31, 2002

Appl. No.:

10/061877

Inventors:

Richard Chi - Temple City CA, US
Jittra Jootar - Mountain View CA, US

Assignee:

Qualcomm Inc. - San Diego CA

International Classification:

H04L 5/12

US Classification:

375265, 375358, 375341, 375347

Abstract:

A trellis decoder determines the most likely transmitted phase in response to previously requested phase adjustments and observed transmitted symbols. Maximum a posteriori (MAP) decoding also may be used. Alternatively, the identified likely transmitted phase is used for data demodulation. This and related features have the benefit of decreasing the effect of phase discrepancies introduced by erroneous reception of phase adjustment information, resulting in improved error rates, and a corresponding increase in system capacity, data throughput, or both.

US Patent:

7376438, May 20, 2008

Filed:

Oct 12, 2005

Appl. No.:

11/249786

Inventors:

Serge Willenegger - Onnens, CH
Richard Chi - Santa Clara CA, US
Chih-Ping Hsu - San Diego CA, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H04B 1/04
H04B 7/00
H04Q 7/20

US Classification:

455522, 455 69, 4551271

Abstract:

Techniques to more efficiently control the transmit power for a data transmission that uses a number of formats (e. g. , rates, transport formats). Different formats for a given data channel (e. g. , transport channel) may require different target SNIRs to achieved a particular BLER. In one aspect, individual target BLER may be specified for each format of each data channel. In another aspect, various power control schemes are provided to achieve different target SNIRs for different formats. In a first power control scheme, multiple individual outer loops are maintained for multiple formats. For each format, its associated outer loop attempts to set the target SNIR such that the target BLER specified for that format is achieved. In a second power control scheme, multiple individual outer loops are maintained and the base station further applies different adjustments to the transmit power levels for different formats.

US Patent:

7734309, Jun 8, 2010

Filed:

May 18, 2007

Appl. No.:

11/750938

Inventors:

Richard Chi - Santa Clara CA, US
Nitin Kasturi - Los Gatos CA, US

Assignee:

QUALCOMM Incorported - San Diego CA

International Classification:

H04Q 7/20

US Classification:

455522, 370318

Abstract:

Techniques for power control that avoids outer loop wind-up are disclosed. In one aspect, wind-up of a target power level is detected, and the target power level is modified in response. In another aspect, unwinding of the target power level is detected, after which the target power level is determined without considering wind-up. Various other aspects are also presented, including wind-up and unwinding detection procedures, and target power level modification procedures. These aspects have the benefit of reducing the time that transmit power exceeds that which is necessary, thus increasing system capacity and performance, and mitigating misallocation of system resources.

US Patent:

7966032, Jun 21, 2011

Filed:

Nov 1, 2005

Appl. No.:

11/264950

Inventors:

Richard Chi - Temple City CA, US
Nitin Kasturi - Los Gatos CA, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H04Q 7/20

US Classification:

455522, 455 134

Abstract:

Techniques for power control that avoids outer loop wind-up are disclosed. In one aspect, wind-up of a target power level is detected, and the target power level is modified in response. In another aspect, unwinding of the target power level is detected, after which the target power level is determined without considering wind-up. Various other aspects are also presented, including wind-up and unwinding detection procedures, and target power level modification procedures. These aspects have the benefit of reducing the time that transmit power exceeds that which is necessary, thus increasing system capacity and performance, and mitigating misallocation of system resources.

US Patent:

8014473, Sep 6, 2011

Filed:

Apr 12, 2001

Appl. No.:

09/834135

Inventors:

Richard Chi - Santa Clara CA, US

Assignee:

Qualcomm Incorporated - San Diego CA

International Classification:

H04L 27/06

US Classification:

375341, 375316, 714795

Abstract:

Techniques for detecting received sequences when certain signaling characteristics (e. g. , transport formats, rates) are not known a priori at the receiver. In one method, a sequence for a transmitted message is received, and a metric value is computed for each of a number of hypothesized messages corresponding to a number of hypotheses for the unknown signaling characteristic of the transmitted message. The metric value is computed based on a MAP metric derived to approximately maximize a joint a posteriori probability between the received sequence and the hypothesized messages. The hypothesized message having the best metric value is selected as the transmitted message. The specific form of the MAP metric is dependent on the particular signaling scheme used to map the message to its corresponding sequence, and may be used for blind transport format detection (BTFD) in a W-CDMA system and blind rate detection in an IS-95 CDMA system.

US Patent:

8023988, Sep 20, 2011

Filed:

Apr 28, 2008

Appl. No.:

12/111092

Inventors:

Serge Willenegger - Onnens, CH
Richard Chi - Santa Clara CA, US
Chih-Ping Hsu - San Diego CA, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H04B 7/00
H04B 1/04
H04B 1/38

US Classification:

455522, 455 69, 4551271, 455 73

Abstract:

Techniques to more efficiently control the transmit power for a data transmission that uses a number of formats (e. g. , rates, transport formats). Different formats for a given data channel (e. g. , transport channel) may require different target SNIRs to achieved a particular BLER. In one aspect, individual target BLER may be specified for each format of each data channel. In another aspect, various power control schemes are provided to achieve different target SNIRs for different formats. In a first power control scheme, multiple individual outer loops are maintained for multiple formats. For each format, its associated outer loop attempts to set the target SNIR such that the target BLER specified for that format is achieved. In a second power control scheme, multiple individual outer loops are maintained and the base station further applies different adjustments to the transmit power levels for different formats.