Vinh C Le

US Patent:

7983684, Jul 19, 2011

Filed:

Jan 31, 2007

Appl. No.:

11/669411

Inventors:

Vinh Le - Fremont CA, US

Assignee:

Symbol Technologies, Inc. - Holtsville NY

International Classification:

H04W 40/00

US Classification:

455446, 4554141, 4554221, 455423, 455457

Abstract:

Systems and methods are provided for optimizing the placement of RF components within an environment. The system operates by defining a spatial model associated with the environment, determining a first placement location of the RF device within the spatial model, defining a localized reference area, determining a coverage area associated with the RF device, identifying a set of gaps associated with the coverage area within the reference area, determining a second placement location of the RF device within the spatial model based on the set of gaps, and placing the AP in the second placement location within the environment.

US Patent:

8223657, Jul 17, 2012

Filed:

Aug 27, 2009

Appl. No.:

12/549043

Inventors:

Ed Geiger - San Martin CA, US
Vinh Le - Fremont CA, US
Nhan Nguyen - San Jose CA, US
Julie Phan - San Jose CA, US

Assignee:

Symbol Technologies, Inc. - Holtsville NY

International Classification:

H04W 24/02

US Classification:

370241, 370252

Abstract:

Techniques are provided for selecting one of a plurality of clock signals used to drive a bus of a WLAN-enabled device having a WLAN radio module coupled to the bus and designed to operate over a plurality of WLAN channels. A network infrastructure device, such as an access point or port, is provided that comprises a WLAN radio module, a PCI bus coupled to the WLAN radio module, a look up table (LUT) and a processor. The WLAN radio module designed to operate over a plurality of WLAN channels in a first frequency band. The LUT comprises a plurality of entries. Each entry comprises: a particular one of the WLAN channels and a corresponding one of a first clock signal having a first clock frequency and a second clock signal having a second clock frequency that is to be selected. The first clock signal causes interference at the WLAN radio module when operating over a first subset of the WLAN channels, and the second clock signal causes interference at the WLAN radio module when operating over a second subset of the WLAN channels. The processor selects, from the LUT based on the one of the WLAN channels that has been selected for the WLAN radio module to communicate over, either the first clock signal or the second clock signal that is to be used to drive the bus.

US Patent:

20080180227, Jul 31, 2008

Filed:

Jan 31, 2007

Appl. No.:

11/669887

Inventors:

Vinh Le - Fremont CA, US
Morteza Zarrabian - Los Altos CA, US

Assignee:

Symbol Technologies, Inc. - Holtsville NY

International Classification:

G08B 1/00

US Classification:

34028602

Abstract:

Systems and methods are provided for optimizing the placement of wireless transmitters or other RF components within an environment. A first one of the plurality of RF devices is initially placed at a first initial location within the spatial model, wherein the first initial location is determined with respect to the reference point. The coverage area for the first RF device is determined, and a second one of the plurality of RF devices is initially placed at a second initial location within the spatial model, wherein the second initial location is determined with respect to the coverage area of the first RF device. At least one of the first and second initial locations can be adjusted to improve the combined coverage area of the first and second RF devices.

US Patent:

20080182528, Jul 31, 2008

Filed:

Jan 31, 2007

Appl. No.:

11/669515

Inventors:

Vinh Le - Fremont CA, US

Assignee:

SYMBOL TECHNOLOGIES, INC. - Holtsville NY

International Classification:

H04B 1/02

US Classification:

455 91

Abstract:

Systems and methods are provided for improving the placement of RF devices each having a position and a coverage area within an environment. The system operates by identifying a gap in the environment that is outside the coverage areas of the RF. A size of the gap and a relative direction of the gap from the position of one of the RF devices are determined. The position of the RF device is then moved in a direction corresponding to the relative direction to thereby reduce the size of the gap. The process can be repeated any number of times until a suitable placement scheme is achieved.

US Patent:

20080182583, Jul 31, 2008

Filed:

Jan 31, 2007

Appl. No.:

11/669374

Inventors:

Vinh Le - Fremont CA, US
Chris Hinsz - San Jose CA, US

Assignee:

SYMBOL TECHNOLOGIES, INC. - Holtsville NY

International Classification:

H04Q 7/36

US Classification:

455446

Abstract:

Systems and methods are provided for optimizing the placement of RF components within an environment. The system operates by defining a spatial model associated with the environment, determining a first placement location of the RF device within the spatial model, determining a coverage area associated with the RF device, identifying a set of gaps associated with the coverage area, calculating a coverage metric based on the set of gaps, determining a second placement location of the RF device within the spatial model based on the coverage metric, and placing the AP in the second placement location within the environment if the coverage metric is less than or equal to a predetermined threshold.

US Patent:

51424010, Aug 25, 1992

Filed:

Jun 28, 1990

Appl. No.:

7/545251

Inventors:

Nelson M. Shen - Palo Alto CA
Vinh P. Le - Sunnyvale CA

Assignee:

Raynet Corporation - Menlo Park CA

International Classification:

H04B 1006

US Classification:

359189

Abstract:

An optical receiver includes a photodetecting device and a wide band video amplifier. The photodetecting device and the video amplifier are coupled by reactive elements which are selected to provide a highly linear and highly sensitive response over a frequency range of approximately 400-950 MHz. The crosstalk between two signals are ten parts per billion when the laser power is at 1 milliwatt and modulation is 25 percent per signal. The noise generated by the receiver is only equivalent to 6 billionth of an ampere. The receiver uses commerically available components.

US Patent:

20200411986, Dec 31, 2020

Filed:

Jun 28, 2019

Appl. No.:

16/456856

Inventors:

- Cupertino CA, US
Amin Tayebi - San Jose CA, US
Carlo Di Nallo - Belmont CA, US
Vinh T. Le - San Jose CA, US

International Classification:

H01Q 5/25
H01Q 1/48
H01Q 1/38
H01Q 1/24

Abstract:

An electronic device may be provided with an antenna for receiving signals in first and second ultra-wideband communications bands. The antenna may include a first arm that radiates in the first band and a second arm that radiates in the second band. The antenna may be fed by a stripline. A microstrip may couple the stripline to the first and second arms and may be configured to match the impedance of the stripline to the impedance of the first and second arms in the first and second bands, respectively. Sets of antennas tuned to different frequencies may be fed by the same transmission line and may collectively exhibit a relatively wide bandwidth. A conductive shielding layer or other conductive components may be layered over the antennas to mitigate cross-polarization interference at the antennas.