Patents by Inventor Man-On Pun

Man-On Pun 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).

  • 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
  • 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
  • Patent number: 8907841
    Abstract: A method for detecting a target in a non-homogeneous environment using a space-time adaptive processing of a radar signal includes normalizing training data of the non-homogeneous environment to produce normalized training data; determining a normalized sample covariance matrix representing the normalized training data; tracking a subspace represented by the normalized sample covariance matrix to produce a clutter subspace matrix; determining a test statistic representing a likelihood of a presence of the target in the radar signal based on the clutter subspace matrix and a steering vector; and comparing the test statistic with a threshold to detect the target.
    Type: Grant
    Filed: November 8, 2011
    Date of Patent: December 9, 2014
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Zafer Sahinoglu, Man-On Pun, Pu Wang
  • Patent number: 8472550
    Abstract: This invention provides a method for exploiting precoder optimization gains and multi-user diversity gains with interference alignment in general MIMO wireless networks including multiple users. Specifically, two embodiments exploit either a gradient-based search or iteratively orthogonalizing inference. The method can achieve near-optimal performance at a low complexity. Furthermore, a scheduling criterion is provided for wireless networks comprised of a large number of mobile stations in each cell. The criterion can be done independently in each cell to significantly reduce information exchanged between base stations in different cells compared to the methods that perform joint scheduling over all cells. The two embodiments can be utilized in a spectrally efficient communications network equipped with relaying nodes.
    Type: Grant
    Filed: December 23, 2010
    Date of Patent: June 25, 2013
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Toshiaki Koike-Akino, Tiangao Gou, Man-On Pun
  • Patent number: 8451956
    Abstract: A blanking scheme for mitigating impulsive noise in wireless networks is based on the signal-to-noise ratio (SNR) of symbols. To fully gain the benefits of the SNR-based blanking scheme, two methods are developed, namely a multi-level thresholding scheme in the time-, spatial- and frequency-domains, and a weighted-input error-correction decoding. The symbols are conditioned as a function of the estimated SNR in time-, frequency-, or spatial-domains or combinations therefore, and the conditioning is applied to an amplitude, phase, or energy level, or combinations thereof.
    Type: Grant
    Filed: December 30, 2009
    Date of Patent: May 28, 2013
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Man-On Pun, Chunjie Duan, Zafer Sahinoglu, Dirk Brinkman
  • Patent number: 8326576
    Abstract: Power quality (PQ) events in a waveform in a power distribution network are detected by sampling the waveform. For each sample, a normalized sample is determined by subtracting an undistorted waveform from the sample. An accumulated weighted log-likelihood ratio (LLR) is determined for all normalized samples, as well as a minimum of the accumulated weighted LLR. If the difference between the accumulated weighted LLR an the minimum LLR is greater than a predetermined threshold, then the PQ event is signaled. The network can be a smart grid.
    Type: Grant
    Filed: December 30, 2009
    Date of Patent: December 4, 2012
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventor: Man-On Pun
  • Patent number: 8284098
    Abstract: A method provides space-time adaptive processing (STAP) for target detection using adaptive matched filters (AMF). A generalized likelihood ratio test (GLRT) is determined where spatial and temporal correlation matrices Q and A are assumed. Then, the correlation matrices A and Q are replaced with maximum likelihood (ML) estimates obtained only from training signals subject to a persymmetric constraint.
    Type: Grant
    Filed: November 24, 2010
    Date of Patent: October 9, 2012
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Zafer Sahinoglu, Pu Wang, Man-On Pun
  • Publication number: 20120249361
    Abstract: A method for detecting a target in a non-homogeneous environment using a space-time adaptive processing of a radar signal includes normalizing training data of the non-homogeneous environment to produce normalized training data; determining a normalized sample covariance matrix representing the normalized training data; tracking a subspace represented by the normalized sample covariance matrix to produce a clutter subspace matrix; determining a test statistic representing a likelihood of a presence of the target in the radar signal based on the clutter subspace matrix and a steering vector; and comparing the test statistic with a threshold to detect the target.
    Type: Application
    Filed: November 8, 2011
    Publication date: October 4, 2012
    Inventors: Zafer Sahinoglu, Man-On Pun, Pu Wang
  • Patent number: 8243582
    Abstract: Channel state information for closed-loop transmit precoding in MIMO networks is fed back from the MSs to the BSs. The feedback is quantized using codebooks shared by the MSs and BSs to reduce overhead. The codebooks can be full-rank or rank-one. The quantized feedback is applicable to any definitions of MIMO channel covariance matrix as well as MIMO channel matrix. Since these codebooks are designed for closed-loop MIMO precoded transmissions, no additional memory is needed to store the codebooks at the BS and the MS only for the quantized feedback purposes.
    Type: Grant
    Filed: December 18, 2009
    Date of Patent: August 14, 2012
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Man-On Pun, Jinyun Zhang, Philip V. Orlik
  • Patent number: 8238277
    Abstract: Channel state information in a closed-loop, multiple-input, multiple-output wireless networks is fed back from each mobile station to a base station by first determining a transmit covariance matrix R, and applying a singular value decomposition (SVD) R=U?VH, where U, V are left and right singular vector matrices, ? is a diagonal matrix with singular values. The matrix V includes column vectors V. A beamforming vector vmax=[1 exp(j?)exp(j2?) . . . exp(j?)]/?{square root over (N)}] is approximated by the column vector V having a maximum magnitude, where ? is a real number. Then, only the angle ? is fed back using a phase modulation mapping of the components exp(j?) onto the associated subcarrier.
    Type: Grant
    Filed: March 26, 2010
    Date of Patent: August 7, 2012
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Philip V. Orlik, Ron Porat, Ramesh Annavajjala, Man-On Pun
  • Patent number: 8228883
    Abstract: A wireless network master node periodically broadcasts beacons that specify a structure of a following fixed length superframe. Slave nodes determine a channel condition between each slave and the master. Then, the set of slaves is partitioned into subsets of slaves according to the channel conditions. The master assigns, to each slave, a transmission rate in a low to high order according to the channel conditions, and the slaves transmit data to the master in the low to high order between two consecutive beacons, wherein the subsets of slaves with a higher transmission rate also receive the data from the subsets of slaves with a lower transmission rate, and wherein a slave with a higher transmission rate includes a part of or all the data from a slave with a lower transmission rate.
    Type: Grant
    Filed: January 4, 2010
    Date of Patent: July 24, 2012
    Assignee: Mitsubishi Electric Research Labortories, Inc.
    Inventors: Raymond Yim, Zhifeng Tao, Zafer Sahinoglu, Man-On Pun
  • Publication number: 20120163433
    Abstract: This invention provides a method for exploiting precoder optimization gains and multi-user diversity gains with interference alignment in general MIMO wireless networks including multiple users. Specifically, two embodiments exploit either a gradient-based search or iteratively orthogonalizing inference. The method can achieve near-optimal performance at a low complexity. Furthermore, a scheduling criterion is provided for wireless networks comprised of a large number of mobile stations in each cell. The criterion can be done independently in each cell to significantly reduce information exchanged between base stations in different cells compared to the methods that perform joint scheduling over all cells. The two embodiments can be utilized in a spectrally efficient communications network equipped with relaying nodes.
    Type: Application
    Filed: December 23, 2010
    Publication date: June 28, 2012
    Inventors: Toshiaki Koike-Akino, Tiangao Gou, Man-On Pun
  • Publication number: 20120127027
    Abstract: A method provides space-time adaptive processing (STAP) for target detection using adaptive matched filters (AMF). A generalized likelihood ratio test (GLRT) is determined where spatial and temporal correlation matrices Q and A are assumed. Then, the correlation matrices A and Q are replaced with maximum likelihood (ML) estimates obtained only from training signals subject to a persymmetric constraint.
    Type: Application
    Filed: November 24, 2010
    Publication date: May 24, 2012
    Inventors: Zafer Sahinoglu, Pu Wang, Man-On Pun
  • Patent number: 8179300
    Abstract: A method surpresses clutter in a space-time adaptive processing system. The method achieves low-complexity computation via two steps. First, the method utilizes an improved fast approximated power iteration method to compress the data into a much smaller subspace. To further reduce the computational complexity, a progressive singular value decomposition (SVD) approach is employed to update the inverse of the covariance matrix of the compressed data. As a result, the proposed low-complexity STAP procedure can achieve near-optimal performance with order-of-magnitude computational complexity reduction as compared to the conventional STAP procedure.
    Type: Grant
    Filed: January 29, 2010
    Date of Patent: May 15, 2012
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Man-On Pun, Zafer Sahinoglu
  • Patent number: 8138963
    Abstract: A method detects a target in a radar signal using space-time adaptive processing. A test statistic is T = max ? ? max ? ? ? R ? f 1 ? ( x 0 , x 1 , … ? , x K ? ? , ? , R ) ? p ? ( R ) ? ? ? R max ? ? ? R ? f 0 ? ( x 0 , x 1 , … ? , x K ? ? , R ) ? p ? ( R ) ? ? ? R , where x0 is a test signal, xk are K training signals, ? is an unknown amplitude of a target signal within the test signal, ? is a scaling factor, R is a covariance matrix of the training signals, and a function max returns a maximum values. The test statistic is compared to a threshold to determine whether the target is present, or not.
    Type: Grant
    Filed: September 10, 2010
    Date of Patent: March 20, 2012
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Man-On Pun, Zafer Sahinoglu, Pu Wang
  • Publication number: 20120062409
    Abstract: A method detects a target in a radar signal using space-time adaptive processing. A test statistic is T = max ? ? max ? ? ? R ? f 1 ? ( x 0 , x 1 , … ? , x K ? ? , ? , R ) ? p ? ( R ) ? ? R max ? ? ? R ? f 0 ? ( x 0 , x 1 , … ? , x K ? ? , R ) ? p ? ( R ) ? ? R , where x0 is a test signal, xk are K training signals, ? is an unknown amplitude of a target signal within the test signal, ? is a scaling factor, R is a covariance matrix of the training signals, and a function max returns a maximum values. The test statistic is compared to a threshold to determine whether the target is present, or not.
    Type: Application
    Filed: September 10, 2010
    Publication date: March 15, 2012
    Inventors: Man-On Pun, Zafer Sahinoglu, Pu Wang
  • Publication number: 20110310931
    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) band-width 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 sub-bands using subsets of the set of antennas. First, the method determines if a number of subbands in the set of the sub-bands 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: June 24, 2009
    Publication date: December 22, 2011
    Inventors: Neelesh B. Mehta, Koon Hoo Teo, Jinyun Zhang, Gennadiy V. Vinokur, Man-On Pun
  • Publication number: 20110237198
    Abstract: Propagation channels are reconstructed from measurements in disjoint subbands of a wideband channel of interest. By using high-resolution estimation of multipath parameters, and suitable soft combining of the results, a channel estimate and subseqeuntly channel models can be extracted that accurately interpolate between the measured subbands.
    Type: Application
    Filed: March 25, 2010
    Publication date: September 29, 2011
    Inventors: Man-On Pun, Philip V. Orlik
  • Publication number: 20110187584
    Abstract: A method surpresses clutter in a space-time adaptive processing system. The method achieves low-complexity computation via two steps. First, the method utilizes an improved fast approximated power iteration method to compress the data into a much smaller subspace. To further reduce the computational complexity, a progressive singular value decomposition (SVD) approach is employed to update the inverse of the covariance matrix of the compressed data. As a result, the proposed low-complexity STAP procedure can achieve near-optimal performance with order-of-magnitude computational complexity reduction as compared to the conventional STAP procedure.
    Type: Application
    Filed: January 29, 2010
    Publication date: August 4, 2011
    Inventors: Man-On Pun, Zafer Sahinoglu
  • Publication number: 20110167126
    Abstract: A wireless network master node periodically broadcasts beacons that specify a structure of a following fixed length superframe. Slave nodes determine a channel condition between each slave and the master. Then, the set of slaves is partitioned into subsets of slaves according to the channel conditions. The master assigns, to each slave, a transmission rate in a low to high order according to the channel conditions, and the slaves transmit data to the master in the low to high order between two consecutive beacons, wherein the subsets of slaves with a higher transmission rate also receive the data from the subsets of slaves with a lower transmission rate, and wherein a slave with a higher transmission rate includes a part of or all the data from a slave with a lower transmission rate.
    Type: Application
    Filed: January 4, 2010
    Publication date: July 7, 2011
    Inventors: Raymond Yim, Zhifeng Tao, Zafer Sahinoghu, Man-On Pun