Patents by Inventor Eiji Mochida

Eiji Mochida 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: 20210328553
    Abstract: A distortion compensation device includes: a first distortion compensation circuit having a first distortion compensation characteristic for compensating for a first distortion occurring in an output of an amplifier, the first distortion compensation circuit being configured to compensate for the first distortion; a second distortion compensation circuit having a second distortion compensation characteristic for compensating for a second distortion occurring in the output of the amplifier, the second distortion compensation circuit being configured to compensate for the second distortion; and an update unit configured to update the second distortion compensation characteristic.
    Type: Application
    Filed: July 18, 2019
    Publication date: October 21, 2021
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventor: Eiji MOCHIDA
  • Publication number: 20210305946
    Abstract: Provided is a distortion compensation device performing distortion compensation on a signal to be amplified by an amplifier, of which an internal state affecting a distortion characteristic varies, using a distortion compensation model, wherein the distortion compensation model includes a plurality of calculation models having respective distortion compensation characteristic for the amplifier in different internal states, and a combiner combining the plurality of calculation models at a combination ratio corresponding to the internal state that varies.
    Type: Application
    Filed: March 15, 2021
    Publication date: September 30, 2021
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Masahiko ONISHI, Eiji MOCHIDA
  • Publication number: 20210303756
    Abstract: Provided is a modeling device performing calculation using an amplifier model that models an amplifier of which an internal state affecting a distortion characteristic varies, wherein the amplifier model includes a plurality of calculation models that model the amplifier in different internal states, and a combiner that combines the plurality of calculation models at a combination ratio corresponding to the internal state that varies.
    Type: Application
    Filed: March 15, 2021
    Publication date: September 30, 2021
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Masahiko ONISHI, Eiji MOCHIDA
  • Publication number: 20210152133
    Abstract: A distortion compensation device includes: a first predistorter configured to compensate for a distortion in an amplifier; and a second predistorter configured to compensate for the distortion in the amplifier, and update distortion compensation characteristics at a higher frequency than that of the first predistorter.
    Type: Application
    Filed: January 26, 2021
    Publication date: May 20, 2021
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventor: Eiji MOCHIDA
  • Patent number: 11005430
    Abstract: A distortion compensation device includes: a first predistorter configured to compensate for a distortion in an amplifier; and a second predistorter configured to compensate for the distortion in the amplifier, and update distortion compensation characteristics at a higher frequency than that of the first predistorter.
    Type: Grant
    Filed: November 8, 2017
    Date of Patent: May 11, 2021
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventor: Eiji Mochida
  • Publication number: 20190393842
    Abstract: A distortion compensation device includes: a first predistorter configured to compensate for a distortion in an amplifier; and a second predistorter configured to compensate for the distortion in the amplifier, and update distortion compensation characteristics at a higher frequency than that of the first predistorter.
    Type: Application
    Filed: November 8, 2017
    Publication date: December 26, 2019
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventor: Eiji MOCHIDA
  • Patent number: 10439688
    Abstract: A radio communication device includes: a baseband portion that generates a plurality of transmit signals destined for a same area; an antenna including a plurality of antenna elements; and a signal processing portion that splits each of the plurality of transmit signals generated by the baseband portion into signals for the respective plurality of antenna elements, multiplies each of the plurality of split transmit signals by a corresponding element of a weighting matrix, and then combines those of the transmit signals provided for each corresponding antenna element.
    Type: Grant
    Filed: October 1, 2015
    Date of Patent: October 8, 2019
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Eiji Mochida, Hitoshi Hirata
  • Publication number: 20180294853
    Abstract: A radio communication device includes: a baseband portion that generates a plurality of transmit signals destined for a same area; an antenna including a plurality of antenna elements; and a signal processing portion that splits each of the plurality of transmit signals generated by the baseband portion into signals for the respective plurality of antenna elements, multiplies each of the plurality of split transmit signals by a corresponding element of a weighting matrix, and then combines those of the transmit signals provided for each corresponding antenna element.
    Type: Application
    Filed: October 1, 2015
    Publication date: October 11, 2018
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Eiji MOCHIDA, Hitoshi HIRATA
  • Patent number: 9515614
    Abstract: An amplifier device 1 includes: a distortion compensation section 3 that performs distortion compensation for an input signal x to an amplifier 2 by digital signal processing; and a separation section 9 that separates an output signal from the amplifier 2 into an I signal as an analog signal component including phase information of the output signal and an analog signal component including power information of the output signal. The distortion compensation section 3 performs distortion compensation for the amplifier 2, based on 1-bit signals obtained by expressing, in 1 bit, the analog I signal and the analog signal component including the power information of the output signal, respectively.
    Type: Grant
    Filed: September 12, 2014
    Date of Patent: December 6, 2016
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventor: Eiji Mochida
  • Publication number: 20160013764
    Abstract: An amplifier device 1 includes: a distortion compensation section 3 that performs distortion compensation for an input signal x to an amplifier 2 by digital signal processing; and a separation section 9 that separates an output signal from the amplifier 2 into an I signal as an analog signal component including phase information of the output signal and an analog signal component including power information of the output signal. The distortion compensation section 3 performs distortion compensation for the amplifier 2, based on 1-bit signals obtained by expressing, in 1 bit, the analog I signal and the analog signal component including the power information of the output signal, respectively.
    Type: Application
    Filed: September 12, 2014
    Publication date: January 14, 2016
    Inventor: Eiji MOCHIDA
  • Patent number: 9049669
    Abstract: A base station device is provided with a MAC unit 30 which performs processing on a MAC layer for wireless communication, a scheduler 10 which performs scheduling for determining allocation of radio resources, and a radio resource management unit 70 which manages the radio resources. The scheduler 10 is connected to the radio resource management unit 70 so as to obtain information from the radio resource management unit 70 without intervention of the MAC unit 30.
    Type: Grant
    Filed: March 22, 2011
    Date of Patent: June 2, 2015
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Takashi Yamamoto, Yoshizo Tanaka, Eiji Mochida
  • Patent number: 9014149
    Abstract: There is provided a communication apparatus capable of effectively removing interference waves from a received signal while reducing the computation load. The communication apparatus includes a weight calculating unit. The weight calculating unit includes a calculating unit and a selecting unit. The calculating unit calculates a first weight and a second weight. The first weight is obtained, for a target known signal being an update target, by updating, using the target known signal, a weight of a first another known signal updated immediately before performing an update using the target known signal. The second weight is obtained, for a target known signal being an update target, by updating, using the target known signal, a weight of a second another known signal. The selecting unit selects one of the first weight and the second weight that has a lower estimation error.
    Type: Grant
    Filed: January 18, 2011
    Date of Patent: April 21, 2015
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventor: Eiji Mochida
  • Patent number: 8995984
    Abstract: A communication system (1) includes a mobile communication network (2); a fixed communication network (3) connected to the mobile communication network (2); and a plurality of radio base stations capable of communicating with a mobile terminal (100) by radio communication. The radio base stations include a first base station (41, 42) connected to the mobile communication network (2); and second base stations (51, 52) connected to the fixed communication network (3) through wire communication lines (61, 62). A communication connection using a predetermined interface is established between one of the second base stations (51) and one of neighboring base stations (the first base station (42) and another one of the second base stations (52)) located in the neighborhood of the one of the second base stations (51).
    Type: Grant
    Filed: October 29, 2010
    Date of Patent: March 31, 2015
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Eiji Mochida, Hirotsugu Yamamoto, Kenichi Murakami
  • Patent number: 8982797
    Abstract: A wireless communication apparatus including an MMSE combining processing unit that performs MMSE combining based on frequency domain received signals obtained by performing a discrete Fourier transform on received signals, the apparatus including an amount-of-phase-rotation estimating unit that estimates an amount of phase rotation occurring in the frequency domain received signals due to a shift in discrete Fourier transform timing of the received signals, and a reverse rotation unit that applies a reverse rotation of an amount of rotation corresponding to the amount of phase rotation estimated by the amount-of-phase-rotation estimating unit, to the frequency domain received signals, wherein the MMSE combining processing unit computes an MMSE weight based on the frequency domain received signals to which the reverse rotation has been applied by the reverse rotation unit, and performs MMSE combining.
    Type: Grant
    Filed: November 22, 2013
    Date of Patent: March 17, 2015
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventor: Eiji Mochida
  • Patent number: 8971882
    Abstract: When installing a femto base station device 1b, failure that may occur in wireless communication is suppressed. The femto base station device 1b includes an RF unit 4 which transmits broadcast information or paging information to a femto terminal device 2b communicating with the femto base station device 1b, and an information storage unit 31 which adds and stores, in the broadcast information or the paging information, location information that relates to the location of the femto base station device 1b and is used by another wireless communication device to suppress interference.
    Type: Grant
    Filed: January 13, 2011
    Date of Patent: March 3, 2015
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Eiji Mochida, Kenichi Murakami
  • Patent number: 8934897
    Abstract: When installing a femto base station device 1b, failure that may occur in wireless communication is suppressed. The femto base station device 1b includes an RF unit 4 which transmits broadcast information or paging information to a femto terminal device 2b communicating with the femto base station device 1b, and an information storage unit 31 which adds and stores, in the broadcast information or the paging information, location information that relates to the location of the femto base station device 1b and is used by another wireless communication device to suppress interference.
    Type: Grant
    Filed: January 13, 2011
    Date of Patent: January 13, 2015
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Eiji Mochida, Kenichi Murakami
  • Patent number: 8923227
    Abstract: A decrease in weight calculation accuracy in MMSE combining caused by a shift in the discrete Fourier transform timing of received signals is prevented. A wireless communication apparatus BS1 includes an MMSE combining processing unit 31 that performs MMSE combining based on frequency domain received signals obtained by performing a discrete Fourier transform on received signals. The wireless communication apparatus BS1 includes an amount-of-phase-rotation estimating unit 32 that estimates an amount of phase rotation occurring in the frequency domain received signals due to a shift in discrete Fourier transform timing of the received signals; and reverse rotation units 33a and 33b that apply a reverse rotation of an amount of rotation corresponding to the amount of phase rotation estimated by the amount-of-phase-rotation estimating unit 32, to the frequency domain received signals.
    Type: Grant
    Filed: October 26, 2010
    Date of Patent: December 30, 2014
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventor: Eiji Mochida
  • Publication number: 20140323124
    Abstract: A base station device is provided with a control information obtaining unit (23) that obtains allocation information indicating an allocation status, for each resource block, of a radio resource allocated to another terminal device that communicates with another base station device, and an output control unit (20) that controls a transmission power of a downlink signal of the base station device and/or a transmission power of an uplink signal of a terminal device connected to the base station device, for each resource block, based on the allocation information. Therefore, the base station device is capable of suppressing interference more effectively depending on various situations.
    Type: Application
    Filed: May 16, 2014
    Publication date: October 30, 2014
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Yoshizo TANAKA, Takashi YAMAMOTO, Eiji MOCHIDA
  • Patent number: 8842655
    Abstract: A communication apparatus capable of simultaneously receiving signals from a plurality of users by an SC-FDMA scheme reduces its circuit size. A communication apparatus BS1, BS2 is capable of simultaneously receiving signals from a plurality of users by the SC-FDMA scheme. The communication apparatus BS1, BS2 includes a plurality of antennas 1a and 1b; a processing unit 6 that performs multi-antenna signal processing on a plurality of received SC-FDMA signals in a frequency domain, the received SC-FDMA signals being received by the plurality of antennas 1a and 1b; and a user separating unit 7 that demultiplexes a signal obtained through the multi-antenna signal processing, into signals for each user based on user allocation information in the SC-FDMA scheme.
    Type: Grant
    Filed: October 26, 2009
    Date of Patent: September 23, 2014
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Eiji Mochida, Mitsuru Hirakawa
  • Publication number: 20140119308
    Abstract: A wireless communication apparatus including an MMSE combining processing unit that performs MMSE combining based on frequency domain received signals obtained by performing a discrete Fourier transform on received signals, the apparatus including an amount-of-phase-rotation estimating unit that estimates an amount of phase rotation occurring in the frequency domain received signals due to a shift in discrete Fourier transform timing of the received signals, and a reverse rotation unit that applies a reverse rotation of an amount of rotation corresponding to the amount of phase rotation estimated by the amount-of-phase-rotation estimating unit, to the frequency domain received signals, wherein the MMSE combining processing unit computes an MMSE weight based on the frequency domain received signals to which the reverse rotation has been applied by the reverse rotation unit, and performs MMSE combining.
    Type: Application
    Filed: November 22, 2013
    Publication date: May 1, 2014
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventor: Eiji Mochida