Patents by Inventor Chris Leung

Chris Leung 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).

  • Patent number: 11323986
    Abstract: Described is a method of decoding a physical sidelink control channel (PSCCH). The method comprises: for a PSCCH candidate in a resource grid, processing a received demodulation reference signal (DMRS) in a subframe of the resource grid associated with the PSCCH candidate to determine one or more potential PSCCHs for decoding, each of the one or more potential PSCCHs being identified by resource block (RB) position in the resource grid and a corresponding DMRS cyclic shift (ncs) value. This step is repeated for at least one other DMRS in the subframe to determine one or more potential PSCCHs for the at least one other DMRS. Then, a subset L of PSCCHs is selected from the potential PSCCHs. The selected subset L of PSCCHs together with their corresponding DMRS cyclic shift (ncs) values are made available for use in a decoding process for the received channel signal.
    Type: Grant
    Filed: March 11, 2020
    Date of Patent: May 3, 2022
    Assignee: Hong Kong Applied Science and Technology Research Institue Company Limited
    Inventors: Eddy Chiu, Yun Hou, Yuyi Mao, Xiangyu Liu, Ching Hong Chris Leung, Man Wai Victor Kwan, Kong Chau Eric Tsang
  • Publication number: 20210289486
    Abstract: Described is a method of decoding a physical sidelink control channel (PSCCH). The method comprises: for a PSCCH candidate in a resource grid, processing a received demodulation reference signal (DMRS) in a subframe of said resource grid associated with said PSCCH candidate to determine one or more potential PSCCHs for decoding, each of said one or more potential PSCCHs being identified by resource block (RB) position in the resource grid and a corresponding DMRS cyclic shift (ncs) value. The foregoing step is repeated for at least one other DMRS in said subframe to determine one or more potential PSCCHs for said at least one other DMRS. Then, a subset L of PSCCHs is selected from said potential PSCCHs whereby said selected subset L of PSCCHs together with their corresponding DMRS cyclic shift (ncs) values are made available for use in a decoding process for the received channel signal.
    Type: Application
    Filed: March 11, 2020
    Publication date: September 16, 2021
    Inventors: Eddy Chiu, Yun Hou, Yuyi Mao, Xiangyu Liu, Ching Hong Chris Leung, Man Wai Victor Kwan, Kong Chau Eric Tsang
  • Patent number: 10812221
    Abstract: Systems and methods which provide for accurate decoding of a received channel signal when station identifier information is unknown. Embodiments accurately decode a physical downlink control channel (PDCCH), such as to obtain downlink control information (DCI), without knowing radio network temporary identifier (RNTI) information. An unknown station identifier information (USII) of embodiments uses redundancy reduction-based error checking (performing error checking between data decoded from a candidate control channel data block containing redundant data and a portion of that candidate control channel data block containing redundancy reduced data) for implementing decoding when station identifier information is unknown. Embodiments of a USII decoder may use a power detection technique for identifying candidate control channel data blocks used in redundancy reduction-based error checking operation.
    Type: Grant
    Filed: February 14, 2019
    Date of Patent: October 20, 2020
    Assignee: Hong Kong Applied Science and Technology Research Institute Co., Ltd.
    Inventors: Xiangyu Liu, Lu Yang, Eddy Chiu, Chenggang Lyu, Jun Zhu, Ching Hong Chris Leung, Man Wai Victor Kwan, Kong Chau Eric Tsang
  • Patent number: 10795407
    Abstract: An electronic reading device, including: a housing, wherein exterior surfaces of the housing include a first and second main surface, a first edge, a second edge, a third edge, and a fourth edge, and each of the edges is located in between the first and second main surface, and the third edge is parallel to the fourth edge, and the first edge is located at an opposite side of the housing than the second edge. The first main surface includes a display, and the second main surface is an opposing surface to the first main surface. The housing is asymmetrical as it includes an extended housing portion that is spaced away from one edge of the display, a thickness of the housing between the first and second main surface increases from the second edge to the first edge, and the housing has an upward bend at the extended housing portion.
    Type: Grant
    Filed: October 19, 2018
    Date of Patent: October 6, 2020
    Assignee: RAKUTEN KOBO INC.
    Inventors: Archer Wun, Kuan-Chang Lin, Anna Buechin, Chris Leung
  • Publication number: 20200266925
    Abstract: Systems and methods which provide for accurate decoding of a received channel signal when station identifier information is unknown. Embodiments accurately decode a physical downlink control channel (PDCCH), such as to obtain downlink control information (DCI), without knowing radio network temporary identifier (RNTI) information. An unknown station identifier information (USII) of embodiments uses redundancy reduction-based error checking (performing error checking between data decoded from a candidate control channel data block containing redundant data and a portion of that candidate control channel data block containing redundancy reduced data) for implementing decoding when station identifier information is unknown. Embodiments of a USII decoder may use a power detection technique for identifying candidate control channel data blocks used in redundancy reduction-based error checking operation.
    Type: Application
    Filed: February 14, 2019
    Publication date: August 20, 2020
    Inventors: Xiangyu Liu, Lu Yang, Eddy Chiu, Chenggang Lyu, Jun Zhu, Ching Hong Chris Leung, Man Wai Victor Kwan, Kong Chau Eric Tsang
  • Publication number: 20200125141
    Abstract: An electronic reading device, including: a housing, wherein exterior surfaces of the housing include a first and second main surface, a first edge, a second edge, a third edge, and a fourth edge, and each of the edges is located in between the first and second main surface, and the third edge is parallel to the fourth edge, and the first edge is located at an opposite side of the housing than the second edge. The first main surface includes a display, and the second main surface is an opposing surface to the first main surface. The housing is asymmetrical as it includes an extended housing portion that is spaced away from one edge of the display, a thickness of the housing between the first and second main surface increases from the second edge to the first edge, and the housing has an upward bend at the extended housing portion.
    Type: Application
    Filed: October 19, 2018
    Publication date: April 23, 2020
    Applicant: RAKUTEN KOBO INC.
    Inventors: Archer WUN, Kuan-Chang Lin, Anna Buechin, Chris Leung
  • Publication number: 20200125226
    Abstract: An electronic reading device, including: a housing, wherein exterior surfaces of the housing include a first main surface, a second main surface, a first edge, a second edge, a third edge, and a fourth edge, and each of the first edge, the second edge, the third edge, and the fourth edge is located in between the first main surface and the second main surface, and a display that is surrounded by the housing, wherein the first main surface of the electronic reading device includes the display, and the second main surface of the electronic reading device is an opposing surface to the first main surface, wherein the housing includes an extended housing portion that is spaced away from one edge of the display by a distance, and the extended housing portion includes a first button and a second button to control the movement of text and/or images that are displayed.
    Type: Application
    Filed: October 19, 2018
    Publication date: April 23, 2020
    Applicant: RAKUTEN KOBO INC.
    Inventors: Archer WUN, Kuan-Chang LIN, Anna BUECHIN, Chris LEUNG, Harry HUTTON, William CHABAN, Ramesh MANTHA
  • Patent number: 8279965
    Abstract: MIMO detection is described that reduces the complexity of computations for finding the soft bit output. The detection process includes QR factorization splitting the distance calculations into two groups, subset lookup using a last cross constellation set (LCCS) lookup, and minimal distance lookup with soft bit output calculation. By grouping the distance calculations into a first group that has one antenna transmitting using a modulation scheme with a generally square constellation diagram and a second group for all of the other antenna constellation diagrams, the LCCS lookup process may be used which substantially reduces the number of calculations to be made in the detection process. Moreover, in the special case of 2×2 antenna, QR factorization is performed by applying a scaled Givens rotation to the channel matrix. The application of the scaled Givens rotation operator eliminates any square root operations that would be performed in a standard QR factorization.
    Type: Grant
    Filed: June 30, 2009
    Date of Patent: October 2, 2012
    Assignee: Hong Kong Applied Science and Technology Research Institute Co., Ltd.
    Inventor: Chris Leung
  • Publication number: 20100329378
    Abstract: MIMO detection is described that reduces the complexity of computations for finding the soft bit output. The detection process includes QR factorization splitting the distance calculations into two groups, subset lookup using a last cross constellation set (LCCS) lookup, and minimal distance lookup with soft bit output calculation. By grouping the distance calculations into a first group that has one antenna transmitting using a modulation scheme with a generally square constellation diagram and a second group for all of the other antenna constellation diagrams, the LCCS lookup process may be used which substantially reduces the number of calculations to be made in the detection process. Moreover, in the special case of 2×2 antenna, QR factorization is performed by applying a scaled Givens rotation to the channel matrix. The application of the scaled Givens rotation operator eliminates any square root operations that would be performed in a standard QR factorization.
    Type: Application
    Filed: June 30, 2009
    Publication date: December 30, 2010
    Applicant: Hong Kong Applied Science and Technology Research Institute Co., Ltd.
    Inventor: Chris Leung
  • Publication number: 20060236117
    Abstract: A reader device includes a housing for receiving a smart card, a processor in electronic communication with an integrated circuit chip of the smart card when the smart card is received in the housing, a wireless communications device in electronic communication with the processor for enabling the reader device to transmit first encrypted information wirelessly and to receive second encrypted information wirelessly, and a memory in electronic communication with the processor that includes one or more routines executable by the processor. The one or more routines include a cryptographic module adapted to encrypt first information to create the first encrypted information and decrypt the second encrypted information to obtain second information. In addition, a communication system that includes the reader device and a computing device, wherein the reader device and computing device are able to wirelessly exchange information in a secure manner.
    Type: Application
    Filed: April 4, 2005
    Publication date: October 19, 2006
    Inventors: Mihal Lazaridis, Scott Rose, Scott Totzke, Herb Little, Chris Leung, Benjamin Boomhour
  • Patent number: D620005
    Type: Grant
    Filed: January 26, 2009
    Date of Patent: July 20, 2010
    Assignee: Research In Motion Limited
    Inventors: Roman P. Rak, Jason T. Griffin, Kwok Chris Leung