Patents by Inventor Yoshihiro Ishikawa

Yoshihiro Ishikawa 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: 8295332
    Abstract: In this invention, a channel estimation value of data symbols of a data channel is calculated by weighting and averaging pilot symbols in a parallel time multiplexing method. Also, a channel estimation value of data symbols during each data symbol interval is calculated by dividing data symbols in a slot into a plurality of data symbol intervals, selecting pilot symbols suitable for calculation of a channel estimation value of data symbols during each data symbol interval and weighting and averaging that pilot symbols. Also, a fading frequency is detected based on an inner product value of pilot symbols. Weighting factors are changed based on the detected fading frequency. Also, a channel estimation value is calculated by weighting and averaging pilot signals using a plurality of weighting sequences. The calculated channel estimation value is used to demodulate received data. The output data with the highest quality is selected by judging reliability of these plurality of demodulated data.
    Type: Grant
    Filed: February 23, 2011
    Date of Patent: October 23, 2012
    Assignee: NTT DoCoMo, Inc.
    Inventors: Yukihiko Okumura, Hidehiro Ando, Masafumi Usuda, Yoshihiro Ishikawa, Seizo Onoe
  • Publication number: 20120259155
    Abstract: A magnetic body may be suitably applied to a drug delivery system using magnetism. Furthermore, a drug delivery control device allows the magnetic body to be suitably applied to drug delivery. The magnetic body includes a magnet and a cover part attached to an edge of the magnet. The cover part is composed of a material with high magnetic permeability, and a ratio of a length to a radius of the cover part is 10:1 to 7:3. The drug delivery control device includes the magnetic body, a head for supporting the magnetic body and a drive mechanism of the head that causes the head to operate along a projected region formed by the affected area with respect to a surface of a tissue. A magnetic field is applied from the magnetic body to the affected area where a magnetic drug is administered.
    Type: Application
    Filed: December 24, 2010
    Publication date: October 11, 2012
    Applicants: IHI CORPORATION
    Inventors: Yoshihiro Ishikawa, Haruki Eguchi, Masakazu Hara
  • Patent number: 8246975
    Abstract: It is intended to provide a drug delivery system which makes it possible to solve the existing technical problems and is easily usable in practice. A drug, which comprises an organic compound or an inorganic compound and has been magnetized by modifying a side chain and/or crosslinking side chains, is induced by a magnetic force into target tissues or an affected part.
    Type: Grant
    Filed: June 28, 2007
    Date of Patent: August 21, 2012
    Assignees: IHI Corporation
    Inventors: Haruki Eguchi, Yoshihiro Ishikawa
  • Publication number: 20120178393
    Abstract: Provided are a receiving apparatus and an interference power estimation method that can perform interference power estimation with high accuracy even when correlation in a fading variation between reference signals is low and obtain accurate receiving quality. The interference power estimation method according to the present invention receives a plurality of discontinuous reference signals on the time/frequency plane, extracts the reference signals from the received signal, linear-combines channel variation values obtained from reference signals surrounding a reference signal of a specific time/frequency on the time/frequency plane with predetermined weighting and estimates interference power using the linear-combined value resulting from the linear combining.
    Type: Application
    Filed: August 12, 2010
    Publication date: July 12, 2012
    Applicant: NTT DOCOMO, INC.
    Inventors: Hiroyuki Kawai, Mototsugu Suzuki, Tetsuro Imai, Yoshihiro Ishikawa
  • Patent number: 8175439
    Abstract: A curable composition for an optical material including a specific silicon-containing polymer (A), a specific epoxy resin (B) and an energy ray-sensitive cationic polymerization initiator (C) as essential components.
    Type: Grant
    Filed: March 7, 2007
    Date of Patent: May 8, 2012
    Assignee: Adeka Corporation
    Inventors: Naofumi Fujiue, Kenji Hara, Yoshihiro Ishikawa, Yoshikazu Shoji
  • Publication number: 20120029167
    Abstract: A drug using the magnetic properties of a metal salen complex as represented by the following general formula in order to magnetize the intended drug by chemically binding the drug to a metal salen complex so that the drug can be delivered to the target diseased site. The drug can be delivered to the diseased site using the magnetic properties of the drug per se without using a carrier made of a magnetic substance as in the conventional methods.
    Type: Application
    Filed: May 20, 2011
    Publication date: February 2, 2012
    Applicants: Yoshihiro Ishikawa, IHI Corporation
    Inventors: Yoshihiro ISHIKAWA, Haruki Eguchi
  • Publication number: 20110281612
    Abstract: A mobile station including a transmission power determining unit configured to determine a transmission power in an uplink shared channel, in accordance with a maximum transmission power value corresponding to power class of the mobile station, the number of resource blocks for the uplink shared channel, path loss between the mobile station and a radio base station which is a connection destination of the uplink shared channel, and transmission power control information received from the radio base station, where when receiving a maximum allowable transmission power value from the radio base station, the transmission power determining unit is configured to determine transmission power in the uplink shared channel, using the maximum allowable transmission power value instead of the maximum transmission power value corresponding to the power class of the mobile station.
    Type: Application
    Filed: September 17, 2009
    Publication date: November 17, 2011
    Applicant: NTT DOCOMO, INC.
    Inventors: Hiroyuki Ishii, Mikio Iwamura, Takahiro Hayashi, Yoshihiro Ishikawa
  • Patent number: 8055202
    Abstract: A measuring apparatus for measuring service quality in an area in a communication system, in which a plurality of base stations use one frequency band for transmitting downlink signals, includes: a receiver configured to receive constant power signals that are the downlink signals transmitted by the base stations through constant power channels in which transmission powers are constant; a reception power measuring unit configured to measure reception powers of the constant power signals transmitted by the respective base stations; a reception power selector configured to select a reception power which is a base for measurement of the quality in the area, out of the reception powers measured by the reception power measuring unit; and an area quality measuring unit configured to measure the quality in the area on the basis of the reception power selected by the reception power selector, and a total of the reception powers not selected by the reception power selector.
    Type: Grant
    Filed: April 6, 2007
    Date of Patent: November 8, 2011
    Assignee: NTT DoCoMo, Inc.
    Inventors: Rie Nagato, Yoshihiro Ishikawa
  • Publication number: 20110222632
    Abstract: A receiving apparatus configured to receive a downlink signal in which pilot symbols are mapped discontinuously on a frequency axis and on a time axis, includes: a first Fourier transform unit configured to perform Fourier transform on the downlink signal; an extraction unit configured to extract reference signals included in a predetermined band from the downlink signal that is Fourier transformed; an inverse Fourier transform unit configured to generate a first signal having a first window size by arranging the extracted reference signals on the frequency axis and by performing inverse Fourier transform on the reference signals arranged on the frequency axis; a time extraction unit configured to divide the first signal into a plurality of signals to extract a signal included in a second window; an adjustment unit configured to generate a second signal that includes the signal included in the second window and that has a window size similar to the first window size in which 0 is inserted in points other than
    Type: Application
    Filed: September 4, 2009
    Publication date: September 15, 2011
    Applicant: NTT DoCoMo Inc.
    Inventors: Mototsugu Suzuki, Tetsurou Imai, Koushirou Kitao, Yoshihiro Ishikawa
  • Publication number: 20110211627
    Abstract: A mobile communication method includes: a step in which a neighboring radio base station eNB#A stops transmission of signals other than a predetermined signal in a predetermined subframe within a predetermined frequency band; a step in which a measurement target radio base station eNB#B changes the transmission frequency or the transmission timing of a pilot symbol not to overlap with the transmission frequency and the transmission timing of the predetermined signal; and a step in which a mobile station UE measures the reception quality of the pilot symbol transmitted by the measurement target radio base station eNB#B.
    Type: Application
    Filed: August 27, 2009
    Publication date: September 1, 2011
    Applicant: NTT DOCOMO, INC.
    Inventors: Mototsugu Suzuki, Tetsurou Imai, Koushirou Kitao, Yoshihiro Ishikawa
  • Publication number: 20110201291
    Abstract: A mobile station UE includes: a measuring unit (12) which measures the reception power of a predetermined signal formed by symbols continuously transmitted in the frequency axis direction or the time axis direction; an estimating unit (14) which estimates the propagation loss of a predetermined signal in the downlink in accordance with the transmission power of a predetermined signal stored in advance and the reception power of the predetermined signal measured by the measuring unit (12); and a calculating unit which calculates the reception power of a pilot signal in accordance with the transmission power of the pilot signal stored in advance and the propagation loss of the predetermined signal estimated by the estimating unit (14).
    Type: Application
    Filed: August 27, 2009
    Publication date: August 18, 2011
    Applicant: NTT DOCOMO, INC.
    Inventors: Mototsugu Suzuki, Tetsurou Imai, Koushirou Kitao, Yoshihiro Ishikawa
  • Publication number: 20110188556
    Abstract: A reception device calculates a radio quality in a downlink by using a plurality of pilot symbols transmitted from a base station. The reception device includes a correlation calculation unit and a radio quality calculation unit. The correlation calculation unit calculates a correlation value between a first pilot symbol and a second pilot symbol on a time axis or a correlation value there between on a frequency axis. If the correlation value obtained by the correlation calculation unit exceeds a predetermined threshold value, the radio quality calculation unit calculates a radio quality in the downlink by using a reception quality of the first pilot symbol and a reception quality of the second pilot symbol.
    Type: Application
    Filed: June 9, 2009
    Publication date: August 4, 2011
    Applicant: NTT DOCOMO, INC.
    Inventors: Mototsugu Suzuki, Tetsurou Imai, Koushirou Kitao, Yoshihiro Ishikawa
  • Publication number: 20110142102
    Abstract: In this invention, a channel estimation value of data symbols of a data channel is calculated by weighting and averaging pilot symbols in a parallel time multiplexing method. Also, a channel estimation value of data symbols during each data symbol interval is calculated by dividing data symbols in a slot into a plurality of data symbol intervals, selecting pilot symbols suitable for calculation of a channel estimation value of data symbols during each data symbol interval and weighting and averaging that pilot symbols. Also, a fading frequency is detected based on an inner product value of pilot symbols. Weighting factors are changed based on the detected fading frequency. Also, a channel estimation value is calculated by weighting and averaging pilot signals using a plurality of weighting sequences. The calculated channel estimation value is used to demodulate received data. The output data with the highest quality is selected by judging reliability of these plurality of demodulated data.
    Type: Application
    Filed: February 23, 2011
    Publication date: June 16, 2011
    Applicant: NTT DoCoMo, Inc.
    Inventors: Yukihiko Okumura, Hidehiro Ando, Masafumi Usuda, Yoshihiro Ishikawa, Seizo Onoe
  • Patent number: 7929592
    Abstract: A channel estimation value of data symbols of a data channel is calculated by weighting and averaging pilot symbols in a parallel time multiplexing method. Also, a channel estimation value of data symbols during each data symbol interval is calculated by dividing data symbols in a slot into a plurality of data symbol intervals, selecting pilot symbols suitable for calculation of a channel estimation value of data symbols during each data symbol interval and weighting and averaging that pilot symbols. Also, a fading frequency is detected based on an inner product value of pilot symbols. Weighting factors are changed based on the detected fading frequency. Also, a channel estimation value is calculated by weighting and averaging pilot signals using a plurality of weighting sequences. The calculated channel estimation value is used to demodulate received data.
    Type: Grant
    Filed: March 31, 2000
    Date of Patent: April 19, 2011
    Assignee: NTT Docomo, Inc.
    Inventors: Yukihiko Okumura, Hidehiro Ando, Masafumi Usuda, Yoshihiro Ishikawa, Seizo Onoe
  • Patent number: 7866898
    Abstract: Disclosed is an optical communication module including a module base in an approximately rectangular shape in which the light path member is introduce from one end surface in a longitudinal direction, a cover member provided at an upper portion of the module base and a plurality of pairs of conductive members in which each of the conductive members constituting a pair are respectively disposed at both outside surfaces of the module base and which are electrically connected to the light path member, and a concave portion is formed at an upper surface of the module base, the cover member is formed so as to cover an opening of the concave portion, and the conductive members are formed so as to extend for equal lengths toward an upper surface side and a lower surface side of the module base from a center line of a height direction of the outside surfaces.
    Type: Grant
    Filed: March 10, 2009
    Date of Patent: January 11, 2011
    Assignee: Mitsumi Electric Co., Ltd.
    Inventors: Yoshihiro Ishikawa, Shinichi Asano, Youichi Itagaki
  • Patent number: 7833042
    Abstract: Provided is a connector for connecting an electronic component, which reduces noise radiation when the electronic component is connected to a substrate through the connector and driven. In a connector (100), a connector main body (130) stores a module (210) inside an opening section (110), and the connector main body is mounted on the substrate by being electrically connected to the stored module (210). The connector main body (130) is provided with a contact lead section (120b) which is lead out to the side of the connector main body (130) to be bonded to a conductor on the substrate. A cover member (160) which opens and closes by turning with a shaft section (161) at the center is pivotally supported on the connector main body (130), and the opening section (110) is covered with the cover member (160) from above. The cover member (160) is provided with a conductive skirt section (170) for covering the contact lead section (120b) from above in a closed state.
    Type: Grant
    Filed: June 29, 2007
    Date of Patent: November 16, 2010
    Assignee: Mitsumi Electric Co., Ltd.
    Inventors: Atsushi Nishio, Shinichi Asano, Yoshihiro Ishikawa, Taketomo Nakane
  • Patent number: 7701906
    Abstract: There is provided a handover control method that does not produce quality deterioration or other similar problems during handover in a mobile communication system in which a first channel shared by a plurality of mobile stations and second channels exclusively used by respective mobile are used in combination.
    Type: Grant
    Filed: October 29, 2002
    Date of Patent: April 20, 2010
    Assignee: NTT DoCoMo, Inc.
    Inventors: Yoshihiro Ishikawa, Takahiro Hayashi, Mikio Iwamura, Takehiro Nakamura
  • Patent number: 7693106
    Abstract: A base station captures phase difference information between a long period spreading code of a common control channel of the base station and a long period spreading code of a common control channel of a neighboring base station of the base station from a mobile station. The base station transmits the phase difference information to a mobile station. The mobile station carries out cell search in accordance with the received phase difference information.
    Type: Grant
    Filed: June 14, 2000
    Date of Patent: April 6, 2010
    Assignee: NTT Docomo, Inc.
    Inventors: Yoshihiro Ishikawa, Mamoru Sawahashi, Seizo Onoe
  • Patent number: 7649859
    Abstract: A CDMA apparatus including a propagation path variation estimator for estimating propagation path variations between respective prior transmit power control sections and a current transmit power control section to obtain propagation path variation estimation values, wherein each of the propagation path variation estimation values is obtained by estimating a propagation path variation between a different corresponding prior transmit power control section and the current transmit power control section; propagation path variation correction part for generating a plurality of corrected products, each corrected product obtained by multiplying at least one of vector, amplitude and/or power of a received signal of the different corresponding prior transmit power control section by said propagation path variation estimation value obtained by estimating the propagation path variation between the different corresponding prior transmit power control section and the current transmit power control section; and averaging p
    Type: Grant
    Filed: November 1, 2005
    Date of Patent: January 19, 2010
    Assignee: NTT DoCoMo, Inc.
    Inventors: Masafumi Usuda, Yoshihiro Ishikawa, Seizo Onoe
  • Publication number: 20090318182
    Abstract: A femto base station according to the present invention includes: a downlink perch channel signal transmission power controller unit configured to change a transmission power of a downlink perch channel signal when a first condition is satisfied; and an uplink reception sensitivity controller unit configured to change an uplink reception sensitivity when a second condition is satisfied after the first condition is satisfied.
    Type: Application
    Filed: June 18, 2009
    Publication date: December 24, 2009
    Applicant: NTT DoCoMo, Inc
    Inventors: Rie NAGATO, Yoshihiro Ishikawa