Zhigang Zhigang Xu

Author:

Zhigang Xu

ISBN #:

0813722373

US Patent:

20130028357, Jan 31, 2013

Filed:

Jul 25, 2011

Appl. No.:

13/190161

Inventors:

David Haub - San Diego CA, US
Zhigang Xu - San Diego CA, US
Jarrett Malone - Carlsbad CA, US

Assignee:

Spreadtrum Communications USA - San Diego CA

International Classification:

H04B 1/10

US Classification:

375350

Abstract:

A novel receiver architecture optimizes receiver performance in the presence of interference. In various embodiments, power estimation circuits are used with variable selectivity to determine the exact nature of the interference and to optimize the performance correspondingly. The variable selectivity is achieved using stages of filtering with progressively narrower bandwidths. Also, the actual method of optimizing the receiver performance is novel compared to the prior art in that the gain settings and the baseband filter order (stages to be used) will be optimized based on the nature of the interference as determined by the power detector measurements. For a device such as a cellular phone that operates in a dynamic and changing environment where interference is variable, embodiments advantageously provide the capability to modify the receiver's operational state depending on the interference.

US Patent:

20130102267, Apr 25, 2013

Filed:

Oct 24, 2011

Appl. No.:

13/279764

Inventors:

David Haub - San Diego CA, US
Zhigang Xu - San Diego CA, US
Jarrett Malone - Carlsbad CA, US

Assignee:

Spreadtrum Communications USA - San Diego CA

International Classification:

H04B 1/10

US Classification:

455296

Abstract:

Embodiments include a novel receiver architecture to optimize receiver performance in the presence of interference. In various embodiments, power estimation circuits are used to determine the exact nature of the interference and to optimize the performance correspondingly. Variable selectivity of at least one power estimation circuit is achieved using a filter with variable bandwidth, with power measurements taken using different bandwidth settings. Also, the actual method of optimizing the receiver performance is novel compared to the prior art in that the gain settings and the baseband filter order (stages to be used) will be optimized based on the nature of the interference as determined by the power detector measurements. For a device such as a cellular phone that operates in a dynamic and changing environment where interference is variable, embodiments advantageously provide the capability to modify the receiver's operational state depending on the interference.

US Patent:

20130309989, Nov 21, 2013

Filed:

Jul 22, 2013

Appl. No.:

13/947627

Inventors:

David HAUB - San Diego CA, US
Zhigang Xu - San Diego CA, US
Jarrett Malone - Carlsbad CA, US

Assignee:

Spreadtrum Communications USA - San Diego CA

International Classification:

H04B 1/10

US Classification:

4552451

Abstract:

Embodiments include a novel receiver architecture to optimize receiver performance in the presence of interference. In various embodiments, power estimation circuits are used to determine the exact nature of the interference and to optimize the performance correspondingly. Variable selectivity of at least one power estimation circuit is achieved using a filter with variable bandwidth, with power measurements taken using different bandwidth settings. Also, the actual method of optimizing the receiver performance is novel compared to the prior art in that the gain settings and the baseband filter order (stages to be used) will be optimized based on the nature of the interference as determined by the power detector measurements. For a device such as a cellular phone that operates in a dynamic and changing environment where interference is variable, embodiments advantageously provide the capability to modify the receiver's operational state depending on the interference.

US Patent:

20140004812, Jan 2, 2014

Filed:

Jul 2, 2012

Appl. No.:

13/540116

Inventors:

David Haub - San Diego CA, US
Zhigang Xu - San Diego CA, US
Jarrett Malone - Carlsbad CA, US

Assignee:

Spreadtrum Communications USA Inc. - San Diego CA

International Classification:

H04B 1/10
H04B 17/00

US Classification:

4552261, 455307

Abstract:

Embodiments include a novel receiver architecture to optimize receiver performance in the presence of interference. In various embodiments, the presence of interference is detected, and the relative frequency location of the interference is detected. The relative frequency location specifies whether the frequency of the interference is high side (above the desired signal, i.e., at a higher frequency) or low side (below the desired signal). The receiver is configured based on the detected interference and relative location thereof. For a device such as a cellular phone that operates in a dynamic and changing environment where interference is variable, embodiments advantageously provide the capability to modify the receiver's operational state depending on the interference.

US Patent:

20150381222, Dec 31, 2015

Filed:

Sep 3, 2015

Appl. No.:

14/844959

Inventors:

- San Diego CA, US
Zhigang Xu - San Diego CA, US
Jarrett Malone - Carlsbad CA, US

International Classification:

H04B 1/10
H04B 17/29
H04L 12/26

Abstract:

A receiver architecture optimizes receiver performance in the presence of interference. In various embodiments, power estimation circuits are used with variable selectivity to determine the exact nature of the interference and to optimize the performance correspondingly. The variable selectivity is achieved using stages of filtering with progressively narrower bandwidths. Also, the actual method of optimizing the receiver performance is an improvement compared to the traditional techniques in that the gain settings and the baseband filter order (stages to be used) will be optimized based on the nature of the interference as determined by the power detector measurements. For a device such as a cellular phone that operates in a dynamic and changing environment where interference is variable, embodiments advantageously provide the capability to modify the receiver's operational state depending on the interference.

US Patent:

20150349820, Dec 3, 2015

Filed:

Aug 6, 2015

Appl. No.:

14/820395

Inventors:

- San Diego CA, US
Zhigang Xu - San Diego CA, US
Jarrett Malone - Carlsbad CA, US

International Classification:

H04B 1/10
H04B 1/12

Abstract:

Embodiments include a novel receiver architecture to optimize receiver performance in the presence of interference. In various embodiments, the presence of interference is detected, and the relative frequency location of the interference is detected. The relative frequency location specifies whether the frequency of the interference is high side (above the desired signal, i.e., at a higher frequency) or low side (below the desired signal). The receiver is configured based on the detected interference and relative location thereof. For a device such as a cellular phone that operates in a dynamic and changing environment where interference is variable, embodiments advantageously provide the capability to modify the receiver's operational state depending on the interference.

US Patent:

20140329480, Nov 6, 2014

Filed:

Jul 21, 2014

Appl. No.:

14/336447

Inventors:

David Haub - San Diego CA, US
Zhigang Xu - San Diego CA, US
Jarrett Malone - Carlsbad CA, US

Assignee:

Spreadtrum Communications USA - San Diego CA

International Classification:

H04B 17/00
H04B 1/12

US Classification:

4552261

Abstract:

A receiver architecture optimizes receiver performance in the presence of interference. In various embodiments, power estimation circuits are used with variable selectivity to determine the exact nature of the interference and to optimize the performance correspondingly. The variable selectivity is achieved using stages of filtering with progressively narrower bandwidths. Also, the actual method of optimizing the receiver performance is an improvement compared to the traditional techniques in that the gain settings and the baseband filter order (stages to be used) will be optimized based on the nature of the interference as determined by the power detector measurements. For a device such as a cellular phone that operates in a dynamic and changing environment where interference is variable, embodiments advantageously provide the capability to modify the receiver's operational state depending on the interference.

US Patent:

20140155060, Jun 5, 2014

Filed:

Dec 3, 2012

Appl. No.:

13/691973

Inventors:

David Haub - San Diego CA, US
Zhigang Xu - San Diego CA, US

International Classification:

H04W 48/16

US Classification:

455434

Abstract:

In a signal processing method, an input signal is provided at an input to a receiver. A bandwidth of the receiver is controlled to a predetermined wideband setting. For band in a plurality of frequency bands, the input signal is processed at the receiver with a mixer, an amplifier, and a filter, to generate a first processed signal, and a power spectral density of the processed signal is generated over that frequency band, to provide a frequency domain signal for that frequency band. Based on the frequency domain signals corresponding to each frequency band in the plurality of frequency bands, a frequency domain representation of the processed signal is reconstructed over a reconstruction band having a bandwidth larger than the predetermined wideband setting. Based on the reconstructed frequency domain representation, a spectral component is identified corresponding to at least one cellular telephony access mode.