Hang Jyh Li

US Patent:

7349504, Mar 25, 2008

Filed:

Mar 18, 2005

Appl. No.:

11/083478

Inventors:

Hang Li - Allen TX, US
Guanghan Xu - Garland TX, US

Assignee:

Navini Networks, Inc. - Richardson TX

International Classification:

H03D 1/04

US Classification:

375346, 375140

Abstract:

A method and system for mitigating interference in a communication system, comprising at least one base station and at least one terminal, are disclosed. The base stations and terminals communicate through a channel existing between them, and the channels include at least a first signal channel and a second signal channel. The method includes determination of channel, noise and self-interference characteristic, computation of a rate limit of the channels, computation of the rate assignment of the channels, and assignment of the computed rate assignments to the channels. In another aspect of the present invention, the method includes determination of channel characteristics; computation of a power control margin, self-interference characteristics, power control command; and assignment of the computed power control command to each communicating terminal and base station. The above power and rate control methods may operate jointly to mitigate both intra-cell and inter-cell interference in wireless communication systems.

US Patent:

7656936, Feb 2, 2010

Filed:

Jan 28, 2003

Appl. No.:

10/352774

Inventors:

Hang Li - Allen TX, US
Weidong Yang - Richardson TX, US
Guanghan Xu - Garland TX, US

Assignee:

Cisco Technology, Inc. - San Jose CA

International Classification:

H04B 1/00
H04B 1/10
H04B 7/02
H04L 1/02

US Classification:

375148, 375144, 375267, 375347, 375348

Abstract:

A method and system for reducing interference in a wireless communication network is disclosed. The wireless communication network has at least one base station using an antenna array and one or more code channels to receive or transmit one or more communication signals from or to a plurality of terminals used by one or more users. A signal received by the antenna array carries one or more training sequences and a traffic signal in a frame. After estimating a spatial signature and joint channel response model per user based on the training sequences, one or more spatial weights are found based on the estimated spatial signature and joint channel response model to maximize a signal to noise ratio. A joint detection matrix is then formed based on the estimated spatial weights, the joint channel response model, and a user code channel assignment. After code correlating a traffic signal to obtain one or more user specific multi-antenna signals, a spatial combining is performed on one or more multi-antenna signals associated with each user to generate scalar symbol estimates.

US Patent:

7885604, Feb 8, 2011

Filed:

May 18, 2006

Appl. No.:

11/437998

Inventors:

Daniel Wee - Garland TX, US
Hang Li - Allen TX, US
Weidong Yang - Schaumburg IL, US
Guanghan Xu - Garland TX, US

Assignee:

Cisco Technology, Inc. - San Jose CA

International Classification:

H04B 1/00
H04B 7/212
H04B 7/00
H04B 15/00
H04J 4/00
H04W 24/00

US Classification:

455 631, 370347, 370436, 355424, 355456, 355502, 355503

Abstract:

A method and system for interference reduction for telecommunication systems are disclosed. The system comprises a base station control device (BCD) for configuring one or more parameters for operating one or more base stations (BSs), a first BS covering a first cell having one or more mobile terminals therein, a second BS covering a second cell neighboring to the first cell and sharing a predetermined frequency band with the first cell, wherein one or more radio frames constructed for communications between the first BS and any mobile terminal of the first cell and one or more radio frames constructed for communications between the second BS and any mobile terminal of the second cell are distinguishable by defining different channel configuration sets having one or more operation parameters, wherein the parameters includes a training sequence, a spreading code, and a channel observation window position.

US Patent:

8086181, Dec 27, 2011

Filed:

Dec 7, 2010

Appl. No.:

12/961741

Inventors:

Daniel Wee - Garland TX, US
Hang Li - Allen TX, US
Weidong Yang - Schaumburg IL, US
Guanghan Xu - Garland TX, US

Assignee:

Cisco Technology, Inc. - San Jose CA

International Classification:

H04B 1/00
H04B 1/38

US Classification:

455 631, 455561

Abstract:

A method and system for interference reduction for telecommunication systems are disclosed. The system comprises a base station control device (BCD) for configuring one or more parameters for operating one or more base stations (BSs), a first BS covering a first cell having one or more mobile terminals therein, a second BS covering a second cell neighboring to the first cell and sharing a predetermined frequency band with the first cell, wherein one or more radio frames constructed for communications between the first BS and any mobile terminal of the first cell and one or more radio frames constructed for communications between the second BS and any mobile terminal of the second cell are distinguishable by defining different channel configuration sets having one or more operation parameters, wherein the parameters includes a training sequence, a spreading code, and a channel observation window position.

US Patent:

20060293060, Dec 28, 2006

Filed:

Oct 5, 2005

Appl. No.:

11/244973

Inventors:

Weidong Yang - Plano TX, US
John Grabner - Plano TX, US
Guanghan Xu - Garland TX, US
Hang Jin - Plano TX, US
Hang Li - Allen TX, US

International Classification:

H04Q 7/20

US Classification:

455453000

Abstract:

A method and system is disclosed for load balancing in a wireless communication system. The method has two major processes for load balancing purpose: the first process moves a mobile terminal from its host base station to some less loaded base station after the expiration of a switch time interval determined by the signal strength difference between the original host base station and the base station that the mobile terminal is moving to; the second process moves the mobile terminal from its host base station to the base station with the strongest signal strength periodically.

US Patent:

20080160921, Jul 3, 2008

Filed:

Mar 13, 2008

Appl. No.:

12/047683

Inventors:

Hang Li - Allen TX, US
Guanghan Xu - Garland TX, US

Assignee:

CISCO TECHNOLOGY INC. - San Jose CA

International Classification:

H04B 17/00

US Classification:

455 6713

Abstract:

A method and system for mitigating interference in a communication system, comprising at least one base station and at least one terminal, are disclosed. The base stations and terminals communicate through a channel existing between them, and the channels include at least a first signal channel and a second signal channel. The method includes determination of channel, noise and self-interference characteristic, computation of a rate limit of the channels, computation of the rate assignment of the channels, and assignment of the computed rate assignments to the channels. In another aspect of the present invention, the method includes determination of channel characteristics; computation of a power control margin, self-interference characteristics, power control command; and assignment of the computed power control command to each communicating terminal and base station. The above power and rate control methods may operate jointly to mitigate both intra-cell and inter-cell interference in wireless communication systems.

US Patent:

20230033107, Feb 2, 2023

Filed:

Aug 9, 2022

Appl. No.:

17/818707

Inventors:

- Dallas TX, US
Hang Li - Dallas TX, US

International Classification:

G06F 16/9535
G06F 16/2455
G06F 16/955

Abstract:

Described herein are techniques and systems for retrieval of content using link-based searches. Embodiments herein include receiving, by a server, a request including a hyperlink directed to a source content. The server may determine whether a database associated with the server comprises the hyperlink. The database stores information of multiple entities each corresponding to one or more hyperlinks. In response to a determination that the database includes the hyperlink, the server may identify an entity corresponding to the hyperlink and provide information of the entity to the computing device. In some embodiments, in response to a determination that the database does not include the hyperlink, the server may identify related web content and return results to user.

US Patent:

20190355164, Nov 21, 2019

Filed:

Dec 12, 2017

Appl. No.:

16/463350

Inventors:

Hang LI - Dallas TX, US

International Classification:

G06T 15/04
B42D 25/324
B42D 25/36
G07D 7/181
G07D 7/2033
G06K 9/00

Abstract:

Processes and systems described herein enable item authentication using a composite label. In some embodiments, a computing device may receive an authentication request for an item to which a composite label is attached. The computing device may further identify an image corresponding to the label material piece associated with the composite label and provide the image to a mobile device of a user such that the item is authenticated at least based on a 3-dimensional texture of the label material piece.