Qinghua Li from San Ramon, CA, age 54

Name / Title

Company / Classification

Phones & Addresses

Qinghua Li
President

NEW GLOBE FOUNDATION
Civic/Social Association

5117 Chiltern Ln, San Ramon, CA 94582

Method And Apparatus For Transmitting Wireless Signals On Multiple Frequency Channels In A Frequency Agile Network
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US Patent:

7039412, May 2, 2006
Filed:

Dec 22, 2003
Appl. No.:

10/744318
Inventors:

Sumeet Sandhu - San Jose CA, US
Qinghua Li - Sunnyvale CA, US
Assignee:

Intel Corporation - Santa Clara CA
International Classification:

H04Q 7/20
H04Q 5/22
H04B 7/216
US Classification:

455445, 455450, 370335, 370342, 340 101
Abstract:

A mixed data unit for use in a wireless network may include a first portion having information that is coded over a single frequency channel and a second portion having information that is coded across multiple frequency channels. In at least one embodiment, the first portion includes duration related information that may be used by legacy client devices within the network to determine a duration for which the legacy device is to remain quiet to avoid packet collisions in the network.

Adaptive Receiver For Multiplex/Multi-Access Communications
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US Patent:

7103098, Sep 5, 2006
Filed:

Mar 15, 2002
Appl. No.:

10/099099
Inventors:

Qinghua Li - Pleasanton CA, US
Leslie A. Rusch - Quebec, CA
Assignee:

Intel Corporation - Santa Clara CA
International Classification:

H03H 7/30
H03H 7/40
H03K 7/00
US Classification:

375229, 375230, 375232
Abstract:

A received communication signal in which input data has been differentially encoded using a number of nominal symbols is filtered according to variable filter coefficients. A symbol is predicted based on the filtered signal, as if the input data had been encoded non-differentially in the communication signal. The filter coefficients are updated in response to the predicted symbol. An example of the differential encoding is differential phase shift keying (DPSK) modulation.

Wideband Spread Spectrum Clock
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US Patent:

7154313, Dec 26, 2006
Filed:

Sep 30, 2004
Appl. No.:

10/957121
Inventors:

Xintian E. Lin - Mountain View CA, US
Qinghua Li - Sunnyvale CA, US
Assignee:

Intel Corporation - Santa Clara CA
International Classification:

H03K 3/84
US Classification:

327164, 327291
Abstract:

A method and apparatus are described. The method comprises generating a clock signal comprising regularly spaced clock-timing transitions between a signal high and a signal low to provide timing for a circuit coupled to the clock signal, and periodicity-disrupting transitions between the signal high and signal low, randomly inserted between the clock-timing transitions to disrupt a periodicity of the regularly spaced clock-timing transitions; and transmitting the clock signal to the circuit.

Antenna Subsystem Calibration Apparatus And Methods In Spatial-Division Multiple-Access Systems
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US Patent:

7206550, Apr 17, 2007
Filed:

Dec 29, 2003
Appl. No.:

10/749904
Inventors:

Qinghua Li - Sunnyvale CA, US
Xintian E Lin - Palo Alto CA, US
Assignee:

Intel Corporation - Santa Clara CA
International Classification:

H04B 1/00
H04B 7/00
US Classification:

455 69, 455 68, 455 73, 4551272, 370401, 370282, 370343
Abstract:

A wireless local area network (WLAN) includes an access point (AP), which provides communications channels to a plurality of stations. The AP supports spatial-division, multiple-access (SDMA) and accordingly includes a plurality of antenna subsystems. In order to achieve zero-forcing downlink beamforming, internal calibration procedures are occasionally performed within the AP. An internal calibration procedure includes an antenna subsystem transmitting a calibration signal. Received signals are measured at other antenna subsystems, and from these measurements, the transmit and receive chain gains are calculated for each antenna subsystem. One or more of these gains are adjusted to satisfy a primary condition, which is that the ratio of the transmit chain gain and the receive chain gain for all of the antenna subsystems are approximately equal (i. e. , all of these ratios are equal to a calibration constant).

Closed Loop Feedback In Mimo Systems
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US Patent:

7236748, Jun 26, 2007
Filed:

Sep 30, 2004
Appl. No.:

10/955826
Inventors:

Qinghua Li - Sunnyvale CA, US
Xintian E. Lin - Palo Alto CA, US
Assignee:

Intel Corporation - Santa Clara CA
International Classification:

H04B 1/38
H04M 1/00
US Classification:

455 69, 4555621
Abstract:

Feedback bandwidth may be reduced in a closed loop MIMO system by representing a beamforming matrix using orthogonal generator matrices.

Compact Feedback For Closed Loop Mimo
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US Patent:

7289770, Oct 30, 2007
Filed:

Sep 28, 2004
Appl. No.:

10/952505
Inventors:

Qinghua Li - Sunnyvale CA, US
Xintian E. Lin - Palo Alto CA, US
Assignee:

Intel Corporation - Santa Clara CA
International Classification:

H04B 1/00
US Classification:

455 69, 4555621, 370334
Abstract:

Compact feedback schemes are presented for use in closed loop multiple input, multiple output systems.

Antenna Selection For Diversity Combining
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US Patent:

7356323, Apr 8, 2008
Filed:

Dec 15, 2003
Appl. No.:

10/734198
Inventors:

Xintian E. Lin - Palo Alto CA, US
Qinghua Li - Sunnyvale CA, US
Assignee:

Intel Corporation - Santa Clara CA
International Classification:

H04B 1/06
US Classification:

4552772, 455 78
Abstract:

A diversity combining receiver may employ a switching architecture that permits multiple receiver chains to be coupled to multiple antennas.

Calibration In Mimo Systems
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US Patent:

7366245, Apr 29, 2008
Filed:

Sep 10, 2004
Appl. No.:

10/939162
Inventors:

Qinghua Li - Sunnyvale CA, US
Xintian E. Lin - Mountain View CA, US
Assignee:

Intel Corporation - Santa Clara CA
International Classification:

H04L 27/28
US Classification:

375260
Abstract:

Aggregate channel reciprocity in a wireless system is supported by calibrating transmitter/receiver pairs.