Christopher R Patrick

US Patent:

6480529, Nov 12, 2002

Filed:

Dec 21, 1999

Appl. No.:

09/468556

Inventors:

Gilbert C. Sih - San Diego CA
Ian Fevrier - San Diego CA
Inyup Kang - San Diego CA
Christopher Patrick - Del Mar CA

Assignee:

Qualcomm, Incorporated - San Diego CA

International Classification:

H04B 1500

US Classification:

375152, 375143, 375147, 375343

Abstract:

A novel and improved method and apparatus for searching is described. This searcher combines the ability to search multiple offsets of single pilots, such as those found in the IS-95 system, with the ability to search multiple pilots, such as those found in a GPS location determination system. Both types of searching can be done in a single architecture combining the parallel computation features of a matched filter with the flexibility of allowing a variable number of coherent accumulations and a variable number of non-coherent accumulations to be performed at high speed for a wide range of search hypotheses in a resource efficient manner. This invention allows for parallel use of the matched filter structure in a time-sliced manner to search multiple windows. In addition, the searcher allows for optional independent Walsh decovering for each search window. The time-sharing approach allows for optional frequency searching of any offset.

US Patent:

6522871, Feb 18, 2003

Filed:

May 9, 2000

Appl. No.:

09/567801

Inventors:

Christopher Patrick - San Diego CA
Saed G. Younis - San Diego CA

Assignee:

Qualcomm, Incorporated - San Diego CA

International Classification:

H04B 106

US Classification:

455256, 455255, 455258, 455264, 331176, 331177 R

Abstract:

The frequency error of an oscillator is minimized by characterizing the operating environment of the oscillator. An electronic device monitors parameters that are determined to have an effect on the frequency accuracy of the internal frequency source. Temperature is one parameter known to have an effect on the frequency of the internal frequency source and a primary contributor to device temperature is the RF Power Amplifier (PA). The electronic device collects and stores the activity level of the PA. The effective PA duty cycle over a predetermined period of time is calculated. The LO operating environment is stabilized by operating the PA at the calculated duty cycle when the LO is required to operate in a high stability mode.

US Patent:

6580746, Jun 17, 2003

Filed:

Aug 28, 2001

Appl. No.:

09/941362

Inventors:

Raghu Challa - San Diego CA
Farrokh Abrishamkar - San Diego CA
Ian Fevrier - San Diego CA
Serguei Glazko - San Diego CA
Christopher Patrick - San Diego CA
Gil Sih - San Diego CA

Assignee:

Qualcomm Incorporated - San Diego CA

International Classification:

H04B 1500

US Classification:

375130, 375136, 375137, 375147

Abstract:

A spread spectrum wireless device ( ) may include a receiver ( ), a searcher ( ), a search controller ( ) and other features. The search controller ( ) selectively generates control signals to control the searcher ( ), which searches for a spread-spectrum signal. In one embodiment, the architecture of the searcher ( ) is dynamically configurable by the search controller ( ) to selectively search multiple channels using multiple frequency bins for the signal.

US Patent:

6700922, Mar 2, 2004

Filed:

Apr 30, 2003

Appl. No.:

10/426219

Inventors:

Raghu Challa - San Diego CA 92128
Farrokh Abrishamkar - San Diego CA 92103
Ian Fevrier - San Diego CA 92129
Serguei Glazko - San Diego CA 92130
Christopher Patrick - San Diego CA 92129
Gil Sih - San Diego CA 92129

International Classification:

H04B 169

US Classification:

375147, 375149

Abstract:

A spread spectrum wireless device ( ) may include a receiver ( ), a searcher ( ), a search controller ( ) and other features. The search controller ( ) selectively generates control signals to control the searcher ( ), which searches for a spread-spectrum signal. In one embodiment, the architecture of the searcher ( ) is dynamically configurable by the search controller ( ) to selectively search multiple channels using multiple frequency bins for the signal.

US Patent:

6861980, Mar 1, 2005

Filed:

May 26, 2004

Appl. No.:

10/854981

Inventors:

Douglas N. Rowitch - Del Mar CA, US
Christopher Patrick - San Diego CA, US

Assignee:

Qualcomm Incorporated - San Diego CA

International Classification:

H04B007/185

US Classification:

34235706, 701213

Abstract:

An assisted wireless position determination system includes a plurality of base stations and a plurality of wireless devices, such as mobile telephones and personal digital assistants, adapted to communicate with the base stations. The wireless position determination system also includes a position determination system for determining the geographic position of the wireless devices. The position determination system includes a position determination entity (PDE) that is connected to the base stations and serves as a processing server for computing the position of the wireless devices. The system and method reduces or eliminates redundant and superfluous data. In addition, the system and method ensure that the wireless device is not loaded with additional capacity, and that the wireless device is provided with precise location information. The embodiments of the system and method of the invention are compliant with the TIA/EIA IS-801 standard or other standards.

US Patent:

6873910, Mar 29, 2005

Filed:

Oct 22, 2002

Appl. No.:

10/278694

Inventors:

Douglas N. Rowitch - Del Mar CA, US
Christopher Patrick - San Diego CA, US

Assignee:

Qualcomm Incorporated - San Diego CA

International Classification:

G01S005/04
G01C021/36

US Classification:

701213, 34235712

Abstract:

A method of and system for searching for position determination signals using a plurality of progressively more sensitive search modes comprising a first level mode, a second mode, and at least one higher level mode. If any of the search window parameters exceed prescribed limits, a first level search is performed, and the search window parameters are refined responsive to the ensuing search results so they are within the prescribed limits. Then, the second level search is performed, and measurements derived from the ensuing search results. If the measurements satisfy selected measurement sufficiency criteria, additional searching within the position fix attempt is avoided. If the measurements do not satisfy the selected measurement sufficiency criteria, a higher level, more sensitive search is performed.

US Patent:

6903684, Jun 7, 2005

Filed:

Mar 31, 2003

Appl. No.:

10/404711

Inventors:

Emilija Simic - La Jolla CA, US
Christopher Patrick - San Diego CA, US
Douglas Rowitch - Del Mar CA, US

Assignee:

Qualcomm Incorporated - San Diego CA

International Classification:

H04B007/185

US Classification:

34235715, 3423571

Abstract:

Position determination accuracy of a wireless communication device may be negatively affected by a large unaccounted GPS doppler bias, which in turn may affect GPS doppler estimations and GPS doppler measurements conducted by the wireless communication device. The quality of GPS doppler measurements is very important for position location, because poor quality GPS doppler measurements may prevent the wireless communication device from acquiring satellites in the most sensitive modes with narrow frequency ranges, which results in reduced GPS pseudorange measurement yield. Large unaccounted GPS doppler bias also adversely affects position accuracy because of the adverse effect on the GPS code phase measurements time propagation to common time prior to their use in position location calculation. The same is true in the case of unaccounted CDMA code doppler, through the adverse effect on the AFLT code phase measurements time propagation to common time prior to their use in a position location engine. This effect is the biggest concern in the case of large search windows.

US Patent:

6928275, Aug 9, 2005

Filed:

May 8, 2000

Appl. No.:

09/567803

Inventors:

Christopher Patrick - San Diego CA, US
Saed G. Younis - San Diego CA, US

Assignee:

Qualcomm Incorporated - San Diego CA

International Classification:

H04B001/06

US Classification:

455256, 455255, 455258, 455264, 331176, 331177 R, 34235712

Abstract:

The frequency error of an oscillator is minimized by characterizing the oscillator. A reference signal from an external source containing a minimal frequency error is provided to an electronic device. The external signal is used as a reference frequency to estimate the frequency error of an internal frequency source. The electronic device monitors parameters that are determined to have an effect on the frequency accuracy of the internal frequency source. Temperature is one parameter known to have an effect on the frequency of the internal frequency source. The electronic device collects and stores the values of the parameters as well as the corresponding output frequency or frequency error of the internal frequency source. The resultant characterization of the internal frequency source is used to compensate the internal frequency source when the internal frequency source is not provided the external reference signal.