Patents by Inventor Itsuhei SHIMIZU

Itsuhei SHIMIZU 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: 10587448
    Abstract: According to one embodiment, a transmission device includes an insertion unit, an allocation unit, a division unit, an IFFT unit, a phase rotation unit, and a transmission unit. The phase rotation unit performs a phase rotation to reduce a PAPR characteristic for each block on which inverse fast Fourier transform has been performed. The transmission unit combines transmission signals, on each of which a phase rotation has been performed by the phase rotation unit, and transmits the combined transmission signal to an external device. In addition, the division unit includes a predetermined band and at least one pilot symbol located outside another of end of this predetermined band on an opposite side of the one end into one block.
    Type: Grant
    Filed: December 12, 2017
    Date of Patent: March 10, 2020
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Infrastructure Systems & Solutions Corporation
    Inventors: Itsuhei Shimizu, Makoto Tanahashi, Noboru Taga, Hideki Oono, Kenichi Matsushita
  • Publication number: 20180183648
    Abstract: According to one embodiment, a transmission device includes an insertion unit, an allocation unit, a division unit, an IFFT unit, a phase rotation unit, and a transmission unit. The phase rotation unit performs a phase rotation to reduce a PAPR characteristic for each block on which inverse fast Fourier transform has been performed. The transmission unit combines transmission signals, on each of which a phase rotation has been performed by the phase rotation unit, and transmits the combined transmission signal to an external device. In addition, the division unit includes a predetermined band and at least one pilot symbol located outside another of end of this predetermined band on an opposite side of the one end into one block.
    Type: Application
    Filed: December 12, 2017
    Publication date: June 28, 2018
    Inventors: Itsuhei Shimizu, Makoto Tanahashi, Noboru Taga, Hideki Oono, Kenichi Matsushita
  • Patent number: 9225577
    Abstract: According to one embodiment, an exciter comprises a sine wave generator, a filter, a digital/analog converter, and a quadrature modulator. The sine wave generator generates a first sine wave and a second sine wave while changing a frequency in a predetermined step at a preset time interval. The filter sets one of stored filter coefficients and performs filter processing for the first sine wave and the second sine wave. The digital/analog converter converts the first sine wave and the second sine wave after the filter processing into a first analog signal and a second analog signal, respectively. The quadrature modulator quadrature-modulates the first analog signal and the second analog signal.
    Type: Grant
    Filed: December 11, 2014
    Date of Patent: December 29, 2015
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Itsuhei Shimizu
  • Publication number: 20150098522
    Abstract: According to one embodiment, an exciter comprises a sine wave generator, a filter, a digital/analog converter, and a quadrature modulator. The sine wave generator generates a first sine wave and a second sine wave while changing a frequency in a predetermined step at a preset time interval. The filter sets one of stored filter coefficients and performs filter processing for the first sine wave and the second sine wave. The digital/analog converter converts the first sine wave and the second sine wave after the filter processing into a first analog signal and a second analog signal, respectively. The quadrature modulator quadrature-modulates the first analog signal and the second analog signal.
    Type: Application
    Filed: December 11, 2014
    Publication date: April 9, 2015
    Inventor: Itsuhei SHIMIZU