Patents by Inventor Koon Hoo Teo

Koon Hoo Teo has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method for Analyzing Discrete Traps in Semiconductor Devices
    Publication number: 20150192635
    Abstract: A method analyzes traps in a semiconductor device by determining a first-order derivative of a signal representing an operation of the semiconductor device over time to produce a signal rate change. The traps in the semiconductor device are analyzed based on lifetimes corresponding to peaks of the signal rate change.
    Type: Application
    Filed: January 7, 2014
    Publication date: July 9, 2015
    Applicant: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Andrei Kniazev, Qun Gao, Koon Hoo Teo
  • System and method for linearizing power amplifiers
    Patent number: 9054940
    Abstract: A power encoder includes an amplitude-phase splitter for splitting an input signal into an envelope signal and a phase modulated signal, and a pre-distortion unit for distorting the envelope signal using a look-up table (LUT) to produce a distorted envelope signal. The power encoder also includes a digital converter for combining the distorted envelope signal with the phase modulated signal to produce a distorted input signal, a pulse width modulator (PWM) for modulating the distorted input signal according to the transformation function to produce a modulated signal, and a switch mode power amplifier for amplifying the modulated signal. The look-up table stores a non-linear mapping of a transformation function and a relationship between the distorted input signal and the modulated signal is non-linear.
    Type: Grant
    Filed: October 25, 2013
    Date of Patent: June 9, 2015
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Rui Ma, Qiuyao Zhu, Koon Hoo Teo, Chunjie Duan
  • Digital Power Encoder for Direct Digital-RF Transmitter
    Publication number: 20150146773
    Abstract: A transmitter includes a first digital up-converter for converting data to an intermediate frequency (IF) signal, a pulse width modulator (PWM) for encoding the IF signal to an IF pulse train, a second digital up-converter for converting the IF pulse train to a radio frequency (RF) pulse train, a power amplifier for amplifying the RF pulse train; and a filter for reconstructing a RF analog signal from the amplified RF pulse train.
    Type: Application
    Filed: January 31, 2015
    Publication date: May 28, 2015
    Inventors: Rui Ma, Qiuyao Zhu, Koon Hoo Teo, Chunjie Duan
  • Antenna selection with frequency-hopped sounding reference signals
    Patent number: 9025471
    Abstract: The embodiments of the invention describe a method for antenna selection in a wireless communication network. The network includes a transceiver having a set of antennas. The transceiver is configured to transmit a frequency-hopped sounding reference signal (SRS) over a subband from a subset of antennas at a time. The transceiver transmits the frequency-hopped SRS from subsets of antennas in the set of antennas alternately. In response to the transmitting, the transceiver receives information indicative of an optimal subset of antennas and transmits data from the optimal subset of antennas.
    Type: Grant
    Filed: March 31, 2009
    Date of Patent: May 5, 2015
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Neelesh B. Mehta, Koon Hoo Teo, Jinyun Zhang
  • System and Method for Linearizing Power Amplifiers
    Publication number: 20150117512
    Abstract: A power encoder includes an amplitude-phase splitter for splitting an input signal into an envelope signal and a phase modulated signal, and a pre-distortion unit for distorting the envelope signal using a look-up table (LUT) to produce a distorted envelope signal. The power encoder also includes a digital converter for combining the distorted envelope signal with the phase modulated signal to produce a distorted input signal, a pulse width modulator (PWM) for modulating the distorted input signal according to the transformation function to produce a modulated signal, and a switch mode power amplifier for amplifying the modulated signal. The look-up table stores a non-linear mapping of a transformation function and a relationship between the distorted input signal and the modulated signal is non-linear.
    Type: Application
    Filed: October 25, 2013
    Publication date: April 30, 2015
    Applicant: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Rui Ma, Qiuyao Zhu, Koon Hoo Teo, Chunjie Duan
  • Maximum Power Point Tracking for Photovoltaic Power Generation System
    Publication number: 20150069840
    Abstract: A method controls power generated by a photovoltaic array. The method estimates a voltage corresponding to a global maximum power point (MPP) of the power generated by the photovoltaic array to produce an estimated voltage; and tracks an output of the power based on the estimated voltage to determine the global MPP.
    Type: Application
    Filed: September 9, 2013
    Publication date: March 12, 2015
    Applicant: Mitsubishi Electric Research Laboratiories, Inc.
    Inventors: Koon Hoo Teo, Yi Deng
  • Space vector modulation for multilevel inverters
    Patent number: 8976556
    Abstract: Inverter is modulated based on first, second, and third switching states determined according to a reference vector represented as a sum of a remainder vector connecting the reference vector with a first vertex of a modulation triangle and a set of vertex vectors connecting a center vertex of space vector diagram with the first vertex. A first switching state of the inverter at the first vertex is determined based on angles of vertex vectors in the set. A second switching state of the inverter at a second vertex of the modulation triangle and a third switching state of the inverter at a third vertex of the modulation triangle are determined based on the first switching state and the remainder vector.
    Type: Grant
    Filed: July 12, 2012
    Date of Patent: March 10, 2015
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Koon Hoo Teo, Yi Deng
  • Method and system for determining parameters of sinusoidal signals
    Patent number: 8972215
    Abstract: At least one parameter of a signal is determined, wherein the signal is a sinusoidal signal including noise, wherein the parameter includes at least one of a frequency of the signal, and an angle of a phase of the signal. The frequency of the signal is determined iteratively based on a linear relationship among the frequency of the signal, samples of the noise, and samples of the signal using a statistical correlation among the samples of the noise. During a current iteration the statistical correlation is updated based on the frequency of the signal determined during a previous iteration, and the samples of the signal are updated with values of the signal during a current period of time.
    Type: Grant
    Filed: March 30, 2011
    Date of Patent: March 3, 2015
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Zafer Sahinoglu, Ming Sun, Koon Hoo Teo
  • Reconfigurable output matching network for multiple power mode power amplifiers
    Patent number: 8963644
    Abstract: An impedance matching network for a radio frequency (RF) amplifier includes multiple stages connected to each other in a first to last order. A first stage produces an RF output signal, and a last stage receives an RF input signal. Each stage includes a first inductor connected to produce an output signal, a second inductor connected to receive an input signal from a next stage, a capacitor connected between the first and second inductors and a ground. In addition, each stage other than the first stage further includes a first switch to by-pass the first and second inductors, a second switch connected between the first and second inductors and the ground, and a controller for controlling, the first and second switches to select a particular power level of a set of power levels.
    Type: Grant
    Filed: March 25, 2013
    Date of Patent: February 24, 2015
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Rui Ma, Sushmit Goswami, Koon Hoo Teo, Chunjie Duan
  • Digital power encoder for direct digital-RF transmitter
    Patent number: 8953670
    Abstract: A transmitter includes a first digital up-converter for converting data to an intermediate frequency (IF) signal, a pulse width modulator (PWM) for encoding the IF signal to an IF pulse train, a second digital up-converter for converting the IF pulse train to a radio frequency (RF) pulse train, a power amplifier for amplifying the RF pulse train; and a filter for reconstructing a RF analog signal from the amplified RF pulse train.
    Type: Grant
    Filed: October 25, 2013
    Date of Patent: February 10, 2015
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Rui Ma, Qiuyao Zhu, Koon Hoo Teo, Chunjie Duan
  • Relaying system and method with partner relays and selective transmission
    Patent number: 8942158
    Abstract: Partner relay systems and methods are provided in which relaying is performed by a pair of partner relays. Signals received from a base station are translated by a first of the pair of partner relays to a different transmission resource for communication between the pair of partner relays, and then upon reception by a second of the pair of partner relays, the signal is translated back to the original transmission resource and re-transmitted towards the receiver.
    Type: Grant
    Filed: September 21, 2012
    Date of Patent: January 27, 2015
    Assignee: Apple Inc.
    Inventors: Shalini Periyalwar, Koon Hoo Teo, Mo-Han Fong, David Falconer
  • Antenna Selection with Frequency-Hopped Sounding Reference Signals
    Publication number: 20150016489
    Abstract: The embodiments of the invention provide a method for selecting antennas for data transmission in a wireless communication network including user equipment (UE). The network is assigned a band of frequencies, wherein the band is partitioned into at least one set of subbands of the band according to a sounding reference signal (SRS) bandwidth configuration in a form of a code-tree having a plurality levels and each level is associated with a partition coefficient. The UE is configured to transmit frequency-hopped SRS on the set of subbands using subsets of the set of antennas. First, the method determines if a number of subbands in the set of the subbands is odd or even based on the SRS bandwidth configuration, and selects a particular subset of the antennas according to whether the number is odd or even. Then, the SRS is transmitted from the particular subset of the antennas.
    Type: Application
    Filed: September 30, 2014
    Publication date: January 15, 2015
    Inventors: Neelesh B Mehta, Koon Hoo Teo, Jinyun Zhang, Gennadiy Vinokur, Man-On Pun
  • Method and system for charging batteries using a kinetic model
    Patent number: 8933673
    Abstract: A battery is charged by first charging the battery at a constant current during a first time interval, and then charging the battery at a varying current during a second time interval. The battery can be a lithium-ion battery, and the charging uses a kinetic model. The kinetic model models the battery having an indiffused well having a capacity c, and a diffused well having a capacity 1?c, and the indiffused well is filled directly by the current, and the diffused well is filled only from the indiffused well via a valve with constant inductance.
    Type: Grant
    Filed: March 13, 2012
    Date of Patent: January 13, 2015
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Zafer Sahinoglu, Xusheng Sun, Koon Hoo Teo
  • DC-link voltage balancing control for multilevel inverters
    Patent number: 8934276
    Abstract: A method for balancing a voltage of an inverter determines an expected voltage of a capacitor based on a voltage of the capacitor at a start of a switching cycle and determines a duty cycle minimizing a value of an objective function representing a difference between the expected voltage of the capacitor and a desired voltage of the capacitor. A switching sequence controlling the inverter is selected based on the duty cycle.
    Type: Grant
    Filed: August 16, 2012
    Date of Patent: January 13, 2015
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Koon Hoo Teo, Yi Deng
  • Antenna selection with frequency-hopped sounding reference signals
    Patent number: 8913551
    Abstract: The embodiments of the invention provide a method for selecting antennas for date transmission in a wireless communication network including user equipment (UE). The network is assigned a band of frequencies, wherein the band is partitioned into at least one set of subbands of the band according to a sounding reference signal (SRS) bandwidth configuration in a form of a codetree having a plurality levels and each level is associated with a partition coefficient. The UE is configured to transmit frequency-hopped SRS on the set of subbands using subsets of the set of antennas. First, the method determines if a number of subbands in the set of the subbands is odd or even based on the SRS bandwidth configuration, and selects a particular subset of the antennas according to whether the number is odd or even. Then, the SRS is transmitted from the particular subset of the antennas.
    Type: Grant
    Filed: June 24, 2009
    Date of Patent: December 16, 2014
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Neelesh B. Mehta, Koon Hoo Teo, Jinyun Zhang, Gennadiy V. Vinokur, Man-On Pun
  • High electron mobility transistor with multiple channels
    Patent number: 8907378
    Abstract: A device includes a source and a drain for transmitting and receiving an electronic charge. The device also includes a first stack and a second stack for providing at least part of a conduction path between the source and the drain, wherein the first stack includes a first gallium nitride (GaN) layer of a first polarity, and the second stack includes a second gallium nitride (GaN) layer of the second polarity, and wherein the first polarity is different from the second polarity. At least one gate operatively connected to at least the first stack for controlling a conduction of the electronic charge, such that, during an operation of the device, the conduction path includes a first two-dimensional electron gas (2DEG) channel formed in the first GaN layer and a second 2DEG channel formed in the second GaN layer.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: December 9, 2014
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Koon Hoo Teo, Peijie Feng, Rui Ma
  • Wireless energy transfer using array of resonant objects
    Patent number: 8890366
    Abstract: A system for exchanging energy wirelessly comprises an array of at least three objects having a resonant frequency, each object is electromagnetic (EM) and non-radiative, and generates an EM near-field in response to receiving the energy, wherein each object in the array is arranged at a distance from all other objects in the array, such that upon receiving the energy the object is strongly coupled to at least one other object in the array via a resonant coupling of evanescent waves; and an energy driver for providing the energy at the resonant frequency to at least one object in the array, such that, during an operation of the system, the energy is distributed from the object to all other objects in the array.
    Type: Grant
    Filed: September 30, 2010
    Date of Patent: November 18, 2014
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Bingnan Wang, Koon Hoo Teo, Da Huang
  • Method for discovering multiple routes in sensor networks
    Patent number: 8861398
    Abstract: Multiple routes from a data source node to multiple data destination nodes in a large scale multi-hop mesh network are discovered. Nodes discover multiple routes to two destinations in an initial discovery phase that includes only two network-wide flooding of packets. The method can also work with one destination. The method can be extended to include more destinations with a proportional increase in the communication overhead. After the completion of the discovery phase, nodes can communicate or forward their own or received data by using any of the available routes.
    Type: Grant
    Filed: March 31, 2011
    Date of Patent: October 14, 2014
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Ghulam M Bhatti, Jianlin Guo, Jinyun Zhang, Koon Hoo Teo
  • Reconfigurable Output Matching Network for Multiple Power Mode Power Amplifiers
    Publication number: 20140285264
    Abstract: An impedance matching network for a radio frequency (RF) amplifier includes multiple stages connected to each other in a first to last order. A first stage produces an RE output signal, and a last stage receives an RF input signal. Each stage includes a first inductor connected to produce an output signal, a second inductor connected to receive an input signal from a next stage, a capacitor connected between the first and second inductors and a ground. In addition, each stage other than the first stage further includes a first switch to by-pass the first and second inductors, a second switch connected between the first and second inductors and the ground, and a controller for controlling, the first and second switches to select a particular power level of a set of power levels.
    Type: Application
    Filed: March 25, 2013
    Publication date: September 25, 2014
    Applicant: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Rui Ma, Sushmit Goswami, Koon Hoo Teo, Chunjie Duan
  • Antenna selection with frequency-hopped sounding reference signals
    Patent number: 8842554
    Abstract: The embodiments of the invention describe a method for antenna selection in a wireless communication network. The network includes a transceiver having a set of antennas. The transceiver is configured to transmit a frequency-hopped sounding reference signal (SRS) over a subband from a subset of antennas at a time. The transceiver transmits the frequency-hopped SRS from subsets of antennas in the set of antennas substantially alternately. In response to the transmitting, the transceiver receives information indicative of an optimal subset of antennas and transmits data from the optimal subset of antennas.
    Type: Grant
    Filed: March 31, 2009
    Date of Patent: September 23, 2014
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Neelesh B. Mehta, Koon Hoo Teo, Jinyun Zhang