Xiao Wang

US Patent:

7974107, Jul 5, 2011

Filed:

Aug 27, 2008

Appl. No.:

12/199471

Inventors:

Yong Li - Campbell CA, US
Junjie Zheng - Santa Clara CA, US
Liang Yan - Campbell CA, US
John Kesterson - San Jose CA, US
Xiao Yan Wang - Pleasanton CA, US

Assignee:

iWatt Inc. - Los Gatos CA

International Classification:

H02M 3/335

US Classification:

363 2101, 363 2108, 363 2116, 363 2112

Abstract:

A hybrid constant current control system that uses both pulse width modulation (PWM) and pulse frequency modulation (PFM) control. When transitioning from constant voltage mode to constant current mode the present invention can continue to control using PWM. Thereafter, when the voltage has dropped, the present invention smoothly transitions to PFM mode. The point of transition is based upon the switching frequency and the lowest rated voltage of operation. The system and method avoids very short (narrow) Ton times which ensures accurate constant current (CC) control with bipolar junction transistor (BJT) devices. The present invention also avoids acoustic noise because the switching frequency is maintained at a high enough level to avoid such acoustic noise even when the energy transferred through the transformer is still substantial and the output voltage is not too low. In addition the output current limit is insensitive to variation in the inductance-input voltage ratio, and is minimized against leakage inductance.

US Patent:

20050238068, Oct 27, 2005

Filed:

Apr 27, 2004

Appl. No.:

10/832560

Inventors:

Suning Tang - Fremont CA, US
Xiao Wang - San Jose CA, US

International Classification:

H01S003/10

US Classification:

372020000

Abstract:

A method and apparatus for generating frequency tunable radio-frequency (RF) pulses utilizing a tunable cavity solid-state laser are disclosed. In one preferred embodiment, an optical RF source provides optical pulses with 1 to 200 GHz repetition rate. The disclosed optical RF source consists of a pump laser and mode matching optics, a pump beam coupler, a laser cavity end mirror, a laser gain medium, a Saturable Bragg Reflector, and a mechanism to change the effective optical length of the laser cavity. By adjusting the effective optical cavity length between the cavity end mirror that also serves as laser output coupler and Saturable Bragg Reflector that also serves as the other end mirror of the cavity, the repetition rate of the output optical pulses is changed. In another preferred embodiment, an optical RF source consists of a pump laser and mode matching optics, a Saturable Bragg Reflector that also serves as a pump coupler, a laser cavity end mirror that also serves as laser output coupler, a laser gain medium, and a mechanism to change the effective optical length of the laser cavity. By adjusting the effective optical cavity length between the cavity end mirror and Saturable Bragg Reflector, the repetition rate of the output optical pulses is changed. In yet another preferred embodiment, an optical RF source further includes an optical to electrical signal converter, and at least one of the following: a RF connector, a connecting waveguide, and a coaxial transmission cable with at least one terminating, impedance matching resistor. In an additional preferred embodiment, an optical RF source consists of a pump laser and mode matching optics, a Saturable Bragg Reflector that also serves as an output coupler and laser cavity end mirror, a second laser cavity end mirror also serving as pump coupler, a laser gain medium, and a mechanism to change the effective optical cavity length of the laser. By adjusting the effective optical cavity length between the cavity end mirrors, the repetition rate of the output optical pulses is changed.

US Patent:

20220322263, Oct 6, 2022

Filed:

Apr 1, 2021

Appl. No.:

17/220893

Inventors:

- San Diego CA, US
Le Liu - Fremont CA, US
Alberto Rico Alvarino - San Diego CA, US
Xiao Feng Wang - San Diego CA, US
Mungal Singh Dhanda - Slough, GB
Jun Ma - San Diego CA, US
Peter Gaal - San Diego CA, US
Bharat Shrestha - San Diego CA, US
Liangping Ma - San Diego CA, US
Umesh Phuyal - San Diego CA, US

International Classification:

H04W 56/00
H04B 7/185
H04W 72/04

Abstract:

Methods, systems, and devices for wireless communications are described in which UEs may communicate with satellites or base stations, or both in a non-terrestrial network. Due to large distances between transmitting devices and receiving devices in a non-terrestrial network, the UE may account for propagation delay and frequency shift of communications with a satellite based on location information of the satellite. The UE may receive first satellite location information from a base station or a satellite, via a broadcast message. The UE may receive second satellite location information from the wireless network node via a unicast message, where both the first satellite location information and the second satellite location information relate to a same satellite. The UE may transmit an uplink communication via the satellite based on at least one of the first satellite location information or the second satellite location information.

US Patent:

20220305488, Sep 29, 2022

Filed:

Aug 28, 2020

Appl. No.:

17/638543

Inventors:

- Boston MA, US
Xiao Wang - Malden MA, US
Irene Scarfo - Cambridge MA, US

International Classification:

B01L 3/00
G01N 15/14
G01N 33/50
G01N 33/68

Abstract:

Provided herein are cell assay devices, methods of assaying the activity of immune cells on target cells, and methods of selecting a treatment for a subject having cancer. Described herein are cell assay devices comprising a biocompatible substrate having an upper surface supporting a plurality of arrays of spots comprising an adhesion-promoting material; a biocompatible membrane having top and bottom surfaces and positioned adjacent to the upper surface of the substrate and defining a plurality of chambers within the membrane between the top surface and the bottom surface of the membrane, wherein the membrane comprises at least two openings in the top surface of the membrane into each chamber to provide access to the chambers.

US Patent:

20220303288, Sep 22, 2022

Filed:

Mar 16, 2021

Appl. No.:

17/202438

Inventors:

- Cambridge MA, US
Kyeong Jin Kim - Lexington MA, US
Xiao Wang - Allston MA, US

Assignee:

Mitsubishi Electric Research Laboratories, Inc. - Cambridge MA

International Classification:

H04L 29/06
G06N 3/08
G06K 9/62

Abstract:

An anomaly detector for detecting anomaly in input data comprises an auto-encoder trained to encode the input data and decode the encoded input data to reconstruct the input data. Further, the anomaly detector comprises a classifier trained to determine a reconstruction loss indicative of a difference between the accepted input data and the reconstructed input data, where the reconstruction loss includes a weighted combination of a plurality of loss functions evaluating reconstruction losses of a plurality of parts of the reconstructed input data, different types of loss functions, or both. The classifier is further configured to detect an anomaly in the reconstructed input data when the reconstruction loss is above a threshold.

US Patent:

20190288888, Sep 19, 2019

Filed:

May 30, 2019

Appl. No.:

16/427045

Inventors:

- San Diego CA, US
Chun-Hao HSU - San Jose CA, US
Xiao Feng WANG - San Diego CA, US
Peter GAAL - San Diego CA, US
Lei XIAO - San Jose CA, US

International Classification:

H04L 27/20
H04L 27/26
H04L 5/00
H04W 4/70

Abstract:

In order to enable a UE receiving a narrowband signal transmitted using in-band resources to use the LTE reference signals to assist the UE in receiving the narrowband signal using an in-band deployment, a phase rotation employed by the base station may be fixed relative to a known reference position in time. An apparatus for wireless communication at a base station may determine a phase offset for a narrowband signal for transmission using wideband resources, the phase offset having a relationship to a reference point in time and transmit the narrowband signal using the determined phase offset. An apparatus for wireless communication at a UE may receive a narrowband signal having a frequency location within a wideband signal and rotate a symbol of the wideband signal by a per symbol phase offset having a relationship of the phase offset to a reference point in time.

US Patent:

20190268118, Aug 29, 2019

Filed:

Feb 21, 2019

Appl. No.:

16/281329

Inventors:

- San Diego CA, US
Juergen Cezanne - Ocean Township NJ, US
Muhammad Nazmul Islam - Littleton MA, US
Navid Abedini - Somerset NJ, US
Xiao Feng Wang - San Diego CA, US
Makesh Pravin John Wilson - San Diego CA, US
Sony Akkarakaran - Poway CA, US
Alexandros Manolakos - San Diego CA, US

International Classification:

H04L 5/00
H04W 74/08
H04L 12/24
H04B 7/06

Abstract:

Methods, systems, and devices for wireless communications are described. A wireless device, such as a user equipment and/or a base station, may determine that an active transmit beam has changed from a first transmit beam to a second transmit beam, the second transmit beam being different from the first transmit beam. The wireless device may identify a reference signal identifier that is associated with the second transmit beam. The wireless device may update, based at least in part on the identifying, a channel state information (CSI) resource setting to include the reference signal identifier, wherein the CSI resource setting is associated with the active transmit beam.

US Patent:

20190182094, Jun 13, 2019

Filed:

Dec 5, 2018

Appl. No.:

16/210970

Inventors:

- San Diego CA, US
Muhammad Nazmul ISLAM - Littleton MA, US
Heechoon LEE - San Diego CA, US
Navid ABEDINI - Somerset NJ, US
Juergen CEZANNE - Ocean Township NJ, US
Alexei Yurievitch GOROKHOV - San Diego CA, US
Wanshi CHEN - San Diego CA, US
Xiao Feng WANG - San Diego CA, US
Hung Dinh LY - San Diego CA, US

International Classification:

H04L 27/26
H04L 5/00
H04W 72/04

Abstract:

Certain aspects of the present disclosure provide techniques for carrier independent signal transmission and reception. Certain aspects provide a method for wireless communication. The method includes applying, at a device, a phase correction to a first signal to compensate for a difference between a first zero tone location comprising a first frequency and a second zero tone location comprising a second frequency. The method further includes one of: transmitting the first signal after applying the phase correction; or receiving the first signal prior to applying the phase correction.