Patents by Inventor Junya Ashita

Junya Ashita 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).

  • Sampling circuit, communication device, distortion correction circuit, signal sampling method, and program
    Patent number: 9077298
    Abstract: A sampling circuit samples a transmission signal containing a particular transmission signal transmitted in a regular and intermittent transmission pattern. The sampling circuit includes a sampling processing unit that performs a sampling process that samples the transmission signal; a determination unit that determines whether the sampling process has been successfully or unsuccessfully performed; and a sampling control unit that sets up sampling acquisition intervals for the sampling processing unit in which the intervals differ depending on whether the sampling process is successfully or unsuccessfully, the sampling processing unit performing the sampling process based on the sampling acquisition interval that has been set up by the sampling control unit.
    Type: Grant
    Filed: August 26, 2010
    Date of Patent: July 7, 2015
    Assignee: NEC CORPORATION
    Inventor: Junya Ashita
  • Distortion compensation circuit, transmitting apparatus and distortion compensating method
    Patent number: 8848828
    Abstract: A distortion compensation circuit for compensating for the distortion characteristics of an amplifier, includes a distortion compensating coefficient calculating element and a distortion compensating operation element. The distortion compensating coefficient calculating element calculates a distortion compensating coefficient to be used for compensation of the distortion characteristics by comparing an input signal with the output signal amplified by the amplifier. The distortion compensating operation element performs a distortion compensating operation on the input signal, using a variably set bit format and the distortion compensating coefficient calculated by the distortion compensating coefficient calculating element.
    Type: Grant
    Filed: December 3, 2009
    Date of Patent: September 30, 2014
    Assignees: NEC Corporation, Hitachi Kokusai Electric Inc.
    Inventors: Junya Ashita, Teppei Shoji
  • Distortion compensation circuit and a distortion compensation method
    Patent number: 8446980
    Abstract: A distortion compensation circuit is provided with an input level limitation unit that limits signal level of an input signal and outputs a signal before distortion compensation, a distortion compensation unit that performs distortion compensation processing to the signal before distortion compensation and outputs a signal after distortion compensation, an distortion compensation coefficient calculation unit that calculates a coefficient for compensating distortion of the output signal of an amplifier as a distortion compensation coefficient, a storage unit that stores the distortion compensation coefficient and a limit value calculation unit that calculates signal level of the signal before distortion compensation.
    Type: Grant
    Filed: May 22, 2009
    Date of Patent: May 21, 2013
    Assignee: NEC Corporation
    Inventor: Junya Ashita
  • SAMPLING CIRCUIT, COMMUNICATION DEVICE, DISTORTION CORRECTION CIRCUIT, SIGNAL SAMPLING METHOD, AND PROGRAM
    Publication number: 20120163498
    Abstract: A sampling circuit samples a transmission signal containing a particular transmission signal transmitted in a regular and intermittent transmission pattern. The sampling circuit includes a sampling processing unit that performs a sampling process that samples the transmission signal; a determination unit that determines whether the sampling process has been successfully or unsuccessfully performed; and a sampling control unit that sets up sampling acquisition intervals for the sampling processing unit in which the intervals differ depending on whether the sampling process is successfully or unsuccessfully, the sampling processing unit performing the sampling process based on the sampling acquisition interval that has been set up by the sampling control unit.
    Type: Application
    Filed: August 26, 2010
    Publication date: June 28, 2012
    Applicant: NEC CORPORATION
    Inventor: Junya Ashita
  • DISTORTION COMPENSATION CIRCUIT, TRANSMITTING APPARATUS AND DISTORTION COMPENSATING METHOD
    Publication number: 20110255636
    Abstract: A distortion compensation circuit for compensating for the distortion characteristics of an amplifier, includes a distortion compensating coefficient calculating element and a distortion compensating operation element. The distortion compensating coefficient calculating element calculates a distortion compensating coefficient to be used for compensation of the distortion characteristics by comparing an input signal with the output signal amplified by the amplifier. The distortion compensating operation element performs a distortion compensating operation on the input signal, using a variably set bit format and the distortion compensating coefficient calculated by the distortion compensating coefficient calculating element.
    Type: Application
    Filed: December 3, 2009
    Publication date: October 20, 2011
    Applicants: HITACHI KOKUSAI ELECTRIC INC., NEC CORPORATION
    Inventors: Junya Ashita, Teppei Shoji
  • DISTORTION COMPENSATION CIRCUIT AND A DISTORTION COMPENSATION METHOD
    Publication number: 20110064155
    Abstract: A distortion compensation circuit and a distortion compensation method in which signal level of a signal after distortion compensation is limited, and which can improve the distortion compensation effect are provided.
    Type: Application
    Filed: May 22, 2009
    Publication date: March 17, 2011
    Inventor: Junya Ashita