Patents by Inventor Kemin Li

Kemin Li 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).

  • Methods and apparatus for power efficient broadcasting and communication systems
    Patent number: 9780959
    Abstract: A method and apparatus for content multicasting and broadcasting and data unicasting in a broadband multicarrier wireless communication system. A base station is configured to transmit, and a mobile station is configured to receive, a sequence of consecutive frames. The frames comprise two types: frames containing time-frequency resources for content multicasting and broadcasting via a single frequency network, and frames containing time-frequency resources for data unicasting without the use of a single frequency network. The two types of frames are intermixed in accordance with an intermixing configuration pattern. The intermixing configuration pattern is indicated by a bit-map contained in a scheduling signal.
    Type: Grant
    Filed: January 13, 2015
    Date of Patent: October 3, 2017
    Assignee: Neocific, Inc.
    Inventors: Haiming Huang, Xiaodong Li, Titus Lo, Kemin Li
  • METHODS AND APPARATUS FOR MULTI-CARRIER COMMUNICATIONS SYSTEMS WITH AUTOMATIC REPEAT REQUEST (ARQ)
    Publication number: 20170264397
    Abstract: Hybrid ARQ is employed in a multi-carrier communication system for retransmission of erroneous packets by taking advantage of time/frequency/space diversity and by combining ARQ functions at physical layer and MAC layers, making the multi-carrier system more robust in a high packet-error environment.
    Type: Application
    Filed: November 28, 2016
    Publication date: September 14, 2017
    Inventors: Xiaodong Li, Haiming Huang, Titus Lo, Kemin Li
  • Method and apparatus for interference control in a multi-cell communication system
    Patent number: 9755809
    Abstract: Methods and apparatus disclosed maximize the capacity of serving cells and minimize inter-cell interferences due to power emission from serving cells in a multi-carrier, multi-cell communication system. The control methods and apparatus take into account various factors such as cell configuration, frequency reuse, geometry and path-loss information, transmission priority, subchannel configuration, feedback from other cells, or any combination thereof, and produce signals that control the transmission power levels and the modulation and coding of transmitted signals.
    Type: Grant
    Filed: March 13, 2014
    Date of Patent: September 5, 2017
    Assignee: Amazon Technologies, Inc.
    Inventors: Xiaodong Li, Kemin Li, Titus Lo, Haiming Huang, Jun Meng
  • Method and apparatus for subframe configuration and generation in a multi-carrier communication system
    Patent number: 9750012
    Abstract: Methods and apparatus for subframe configuration and generation in a multi-cell multi-carrier system. A frame for radio transmission in the system consists of multiple subframes, and each subframe consists of multiple Orthogonal Frequency Division Multiplexing (OFDM) symbols. Training symbols, frequency-domain data scrambling, size of Fast-Fourier Transform (FFT), or length of cyclic prefix can be configured differently for each subframe to facilitate different applications, such as unicasting or broadcasting.
    Type: Grant
    Filed: November 23, 2015
    Date of Patent: August 29, 2017
    Assignee: Neocific, Inc.
    Inventors: Xiaodong Li, Titus Lo, Kemin Li, Haiming Huang
  • Method and apparatus using cell-specific and common pilot subcarriers in multi-carrier, multi-cell wireless communication networks
    Patent number: 9749168
    Abstract: A multi-carrier cellular wireless network (400) employs base stations (404) that transmit two different groups of pilot subcarriers: (1) cell-specific pilot subcarriers, which are used by a receiver to extract information unique to each individual cell (402), and (2) common pilots subcarriers, which are designed to possess a set of characteristics common to all the base stations (404) of the system. The design criteria and transmission formats of the cell-specific and common pilot subcarriers are specified to enable a receiver to perform different system functions. The methods and processes can be extended to other systems, such as those with multiple antennas in an individual sector and those where some subcarriers bear common network/system information.
    Type: Grant
    Filed: June 22, 2015
    Date of Patent: August 29, 2017
    Assignee: Neocific, Inc.
    Inventors: Xiaodong Li, Titus Lo, Kemin Li, Haiming Huang
  • METHODS AND APPARATUS FOR MULTI-CARRIER COMMUNICATION SYSTEMS WITH ADAPTIVE TRANSMISSION AND FEEDBACK
    Publication number: 20170055245
    Abstract: An arrangement is disclosed where in a multi-carrier communication system, the modulation scheme, coding attributes, training pilots, and signal power may be adjusted to adapt to channel conditions in order to maximize the overall system capacity and spectral efficiency without wasting radio resources or compromising error probability performance, etc.
    Type: Application
    Filed: March 28, 2016
    Publication date: February 23, 2017
    Inventors: Xiaodong Li, Titus Lo, Kemin Li, Haiming Huang
  • Methods and apparatus for random access in multi-carrier communication systems
    Patent number: 9565700
    Abstract: A method at a base station of determining a time delay associated with a mobile station in a multiple access wireless communication system. A signal is received from a mobile station over a selected random access subchannel in a selected random access time slot. A Fast Fourier Transform is applied to the received signal to generate a transformed signal in the frequency domain. The transformed signal is then processed in the frequency domain by computing a dot-product to identify a random access sequence carried in the received signal. The received signal is then processed in the time domain by computing a correlation between a time-shifted version of the received signal and the identified random access sequence to determine a time delay associated with the mobile station.
    Type: Grant
    Filed: May 21, 2013
    Date of Patent: February 7, 2017
    Assignee: Neocific, Inc.
    Inventors: Xiaodong Li, Titus Lo, Kemin Li, Haiming Huang
  • Methods and apparatus for multi-carrier communication systems with automatic repeat request (ARQ)
    Patent number: 9509451
    Abstract: Hybrid ARQ is employed in a multi-carrier communication system for retransmission of erroneous packets by taking advantage of time/frequency/space diversity and by combining ARQ functions at physical layer and MAC layers, making the multi-carrier system more robust in a high packet-error environment.
    Type: Grant
    Filed: July 10, 2015
    Date of Patent: November 29, 2016
    Assignee: Neocific, Inc.
    Inventors: Xiaodong Li, Haiming Huang, Titus Lo, Kemin Li
  • OFDMA WITH ADAPTIVE SUBCARRIER-CLUSTER CONFIGURATION AND SELECTIVE LOADING
    Publication number: 20160218842
    Abstract: A method and apparatus for allocating subcarriers in an orthogonal frequency division multiple access (OFDMA) system is described. In one embodiment, the method comprises allocating at least one diversity cluster of subcarriers to a first subscriber and allocating at least one coherence cluster to a second subscriber.
    Type: Application
    Filed: April 7, 2016
    Publication date: July 28, 2016
    Inventors: Xiaodong Li, Hui Liu, Kemin Li, Wenzhong Zhang
  • OFDMA with adaptive subcarrier-cluster configuration and selective loading
    Patent number: 9344211
    Abstract: A method and apparatus for allocating subcarriers in an orthogonal frequency division multiple access (OFDMA) system is described. In one embodiment, the method comprises allocating at least one diversity cluster of subcarriers to a first subscriber and allocating at least one coherence cluster to a second subscriber.
    Type: Grant
    Filed: July 23, 2015
    Date of Patent: May 17, 2016
    Assignee: Adaptix, Inc.
    Inventors: Xiaodong Li, Hui Liu, Kemin Li, Wenzhong Zhang
  • Methods and apparatus for multi-carrier communication systems with adaptive transmission and feedback
    Patent number: 9301296
    Abstract: An arrangement is disclosed where in a multi-carrier communication system, the modulation scheme, coding attributes, training pilots, and signal power may be adjusted to adapt to channel conditions in order to maximize the overall system capacity and spectral efficiency without wasting radio resources or compromising error probability performance, etc.
    Type: Grant
    Filed: November 12, 2014
    Date of Patent: March 29, 2016
    Assignee: Neocific, Inc.
    Inventors: Xiaodong Li, Titus Lo, Kemin Li, Haiming Huang
  • METHOD AND APPARATUS FOR SUBFRAME CONFIGURATION AND GENERATION IN A MULTI-CARRIER COMMUNICATION SYSTEM
    Publication number: 20160081070
    Abstract: Methods and apparatus for subframe configuration and generation in a multi-cell multi-carrier system. A frame for radio transmission in the system consists of multiple subframes, and each subframe consists of multiple Orthogonal Frequency Division Multiplexing (OFDM) symbols. Training symbols, frequency-domain data scrambling, size of Fast-Fourier Transform (FFT), or length of cyclic prefix can be configured differently for each subframe to facilitate different applications, such as unicasting or broadcasting.
    Type: Application
    Filed: November 23, 2015
    Publication date: March 17, 2016
    Inventors: Xiaodong Li, Titus Lo, Kemin Li, Haiming Huang
  • OFDMA with adaptive subcarrier-cluster configuration and selective loading
    Patent number: 9219572
    Abstract: A method and apparatus for allocating subcarriers in an orthogonal frequency division multiple access (OFDMA) system is described. In one embodiment, the method comprises allocating at least one diversity cluster of subcarriers to a first subscriber and allocating at least one coherence cluster to a second subscriber.
    Type: Grant
    Filed: July 23, 2015
    Date of Patent: December 22, 2015
    Assignee: Adaptix, Inc.
    Inventors: Xiaodong Li, Hui Liu, Kemin Li, Wenzhong Zhang
  • OFDMA with adaptive subcarrier-cluster configuration and selective loading
    Patent number: 9210708
    Abstract: A method and apparatus for allocating subcarriers in an orthogonal frequency division multiple access (OFDMA) system is described. In one embodiment, the method comprises allocating at least one diversity cluster of subcarriers to a first subscriber and allocating at least one coherence cluster to a second subscriber.
    Type: Grant
    Filed: August 14, 2015
    Date of Patent: December 8, 2015
    Assignee: Adaptix, Inc.
    Inventors: Xiaodong Li, Hui Liu, Kemin Li, Wenzhong Zhang
  • OFDMA WITH ADAPTIVE SUBCARRIER-CLUSTER CONFIGURATION AND SELECTIVE LOADING
    Publication number: 20150351100
    Abstract: A method and apparatus for allocating subcarriers in an orthogonal frequency division multiple access (OFDMA) system is described. In one embodiment, the method comprises allocating at least one diversity cluster of subcarriers to a first subscriber and allocating at least one coherence cluster to a second subscriber.
    Type: Application
    Filed: August 14, 2015
    Publication date: December 3, 2015
    Inventors: Xiaodong Li, Hui Liu, Kemin Li, Wenzhong Zhang
  • OFDMA with adaptive subcarrier-cluster configuration and selective loading
    Patent number: 9203553
    Abstract: A method and apparatus for allocating subcarriers in an orthogonal frequency division multiple access (OFDMA) system is described. In one embodiment, the method comprises allocating at least one diversity cluster of subcarriers to a first subscriber and allocating at least one coherence cluster to a second subscriber.
    Type: Grant
    Filed: July 23, 2015
    Date of Patent: December 1, 2015
    Assignee: Adaptix, Inc.
    Inventors: Xiaodong Li, Hui Liu, Kemin Li, Wenzhong Zhang
  • Methods and apparatus for subframe configuration and generation in a multi-carrier communication system
    Patent number: 9198179
    Abstract: Methods and apparatus for subframe configuration and generation in a multi-cell multi-carrier system. A frame for radio transmission in the system consists of multiple subframes, and each subframe consists of multiple Orthogonal Frequency Division Multiplexing (OFDM) symbols. Training symbols, frequency-domain data scrambling, size of Fast-Fourier Transform (FFT), or length of cyclic prefix can be configured differently for each subframe to facilitate different applications, such as unicasting or broadcasting.
    Type: Grant
    Filed: May 13, 2014
    Date of Patent: November 24, 2015
    Assignee: Neocific, Inc.
    Inventors: Xiaodong Li, Titus Lo, Kemin Li, Haiming Huang
  • OFDMA with adaptive subcarrier-cluster configuration and selective loading
    Patent number: 9191138
    Abstract: A method and apparatus for allocating subcarriers in an orthogonal frequency division multiple access (OFDMA) system is described. In one embodiment, the method comprises allocating at least one diversity cluster of subcarriers to a first subscriber and allocating at least one coherence cluster to a second subscriber.
    Type: Grant
    Filed: April 3, 2015
    Date of Patent: November 17, 2015
    Assignee: Adaptix, Inc.
    Inventors: Xiaodong Li, Hui Liu, Kemin Li, Wenzhong Zhang
  • OFDMA WITH ADAPTIVE SUBCARRIER-CLUSTER CONFIGURATION AND SELECTIVE LOADING
    Publication number: 20150326343
    Abstract: A method and apparatus for allocating subcarriers in an orthogonal frequency division multiple access (Oil)MA) system is described. In one embodiment, the method comprises allocating at least one diversity cluster of subcarriers to a first subscriber and allocating at least one coherence cluster to a second subscriber.
    Type: Application
    Filed: July 23, 2015
    Publication date: November 12, 2015
    Inventors: Xiaodong Li, Hui Liu, Kemin Li, Wenzhong Zhang
  • OFDMA WITH ADAPTIVE SUBCARRIER-CLUSTER CONFIGURATION AND SELECTIVE LOADING
    Publication number: 20150326344
    Abstract: A method and apparatus for allocating subcarriers in an orthogonal frequency division multiple access (OFDMA) system is described. In one embodiment, the method comprises allocating at least one diversity cluster of subcarriers to a first subscriber and allocating at least one coherence cluster to a second subscriber.
    Type: Application
    Filed: July 23, 2015
    Publication date: November 12, 2015
    Inventors: Xiaodong Li, Hui Liu, Kemin Li, Wenzhong Zhang