Eugene Thomas Sy

US Patent:

6834079, Dec 21, 2004

Filed:

Oct 20, 2000

Appl. No.:

09/693498

Inventors:

Jeffrey C. Strait - Reno NV
Eugene T. Sy - Cupertino CA

Assignee:

3Com Corporation - Santa Clara CA

International Classification:

H03H 730

US Classification:

375232, 375229

Abstract:

A system and method for minimizing the effective channel impulse response in multitone communication systems, is provided. A time domain equalizer is utilized to shorten the channel impulse response to a length equal to or less than the time duration of the cyclic prefix. The time domain equalizer includes an adaptable filter with updateable coefficients. The updateable coefficients are calculated in a storage efficient manner to effectively estimate a desirable channel response. Processing of the time domain equalizer signal improves the symbol boundary estimate and effectively reduces the effect of noise of the updateable coefficient solution.

US Patent:

7307480, Dec 11, 2007

Filed:

Apr 24, 2003

Appl. No.:

10/422271

Inventors:

Li Zhang - San Diego CA, US
Eugene Sy - San Jose CA, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

G01R 23/00
H04Q 7/34

US Classification:

331 44, 370332

Abstract:

Techniques for improved low latency frequency switching are disclosed. In one embodiment, a controller receives a frequency switch command and generates a frequency switch signal at a time determined in accordance with a system timer. In another embodiment, gain calibration is initiated subsequent to the frequency switch signal delayed by the expected frequency synthesizer settling time. In yet another embodiment, DC cancellation control and gain control are iterated to perform gain calibration, with signaling to control the iterations without need for processor intervention. Various other embodiments are also presented. Aspects of the embodiments disclosed may yield the benefit of reducing latency during frequency switching, allowing for increased measurements at alternate frequencies, reduced time spent on alternate frequencies, and the capacity and throughput improvements that follow from minimization of disruption of an active communication session and improved neighbor selection.

US Patent:

8565121, Oct 22, 2013

Filed:

Oct 25, 2007

Appl. No.:

11/924578

Inventors:

Li Zhang - San Diego CA, US
Eugene Sy - San Jose CA, US
David Malonado - Chula Vista CA, US
Upkar Dhaliwal - San Diego CA, US

Assignee:

QUALCOMM, Incorporated - San Diego CA

International Classification:

H04J 3/06

US Classification:

370255, 370350, 370457, 370465, 370504

Abstract:

Techniques for improved low latency frequency switching are disclosed. In one embodiment, a controller receives a frequency switch command and generates a frequency switch signal at a time determined in accordance with a system timer. In another embodiment, gain calibration is initiated subsequent to the frequency switch signal delayed by the expected frequency synthesizer settling time. In yet another embodiment, DC cancellation control and gain control are iterated to perform gain calibration, with signaling to control the iterations without need for processor intervention. Various other embodiments are also presented. Aspects of the embodiments disclosed may yield the benefit of reducing latency during frequency switching, allowing for increased measurements at alternate frequencies, reduced time spent on alternate frequencies, and the capacity and throughput improvements that follow from minimization of disruption of an active communication session and improved neighbor selection.

US Patent:

8645732, Feb 4, 2014

Filed:

Jan 25, 2011

Appl. No.:

13/013381

Inventors:

Vidyut M. Naware - Sunnyvale CA, US
Ketan N. Patel - San Jose CA, US
Eugene T. Sy - Santa Clara CA, US

Assignee:

QUALCOMM, Incorporated - San Diego CA

International Classification:

G06F 1/32
G06F 1/00

US Classification:

713320, 713322, 713324

Abstract:

User experiences on wireless devices are affected by communication, computation, and user interface capabilities. Another key performance indicator of a wireless device is its battery life. A method, algorithm and apparatus for improving the communication, computation and user interface capabilities of a mobile device is disclosed, which requires the expenditure of less energy and increases battery life. The trade-off between battery life and user experience related to the communication capability is managed by a protocol stack power optimization algorithm that optimally allocates energy resources. The power management algorithm inputs and combines measurements made at various layers of the protocol stack to selectively control a set of actions impacting energy usage. The algorithm maps from a set of measurements to a set of actions that provides the best trade-off between user experience and energy consumption.

US Patent:

6763061, Jul 13, 2004

Filed:

Jul 31, 2000

Appl. No.:

09/628842

Inventors:

Jeffrey C. Strait - Nevada City CA
Eugene T. Sy - Cupertino CA

Assignee:

3Com Corporation - Santa Clara CA

International Classification:

H04B 110

US Classification:

375219

Abstract:

The system and method of the preferred embodiments may be directed to improving the signal-to-noise ratio in frequency spectrum regions where narrowband interference may be present. The system and method of the preferred embodiments includes reducing the narrowband interference by determining a noise estimate. In accordance with the noise estimate and output of a frequency domain equalizer, a noise-cancelled output may be obtained.