Patents by Inventor Kei Ito

Kei Ito 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: 11396289
    Abstract: A braking assistance device for a vehicle includes an object sensing unit for sensing an object, an intersection entry determination unit for determining entry of a host vehicle into an intersection, and a braking assistance execution unit for executing braking assistance by a braking device so as to avoid or mitigate collision with the object. If the host vehicle is determined to be entering the intersection, the braking assistance execution unit determines, based on a sensing result from the object sensing unit, a traffic environment at the intersection, and controls execution of the braking assistance in accordance with the determined traffic environment.
    Type: Grant
    Filed: June 12, 2019
    Date of Patent: July 26, 2022
    Assignee: DENSO CORPORATION
    Inventors: Kei Kamiya, Yosuke Ito, Takaharu Oguri, Takahiro Baba
  • Patent number: 11271784
    Abstract: A wireless communication device includes frequency hopping means for changing a radio frequency based on a temporarily defined pattern, and a frequency offset compensation unit. The frequency offset compensation unit includes a frequency offset calculator that calculates a frequency offset amount from a received signal, a hopping frequency value converter that uses the frequency offset amount, a radio frequency from which the frequency offset amount is calculated, and a transition destination radio frequency transitioned by the frequency hopping means to calculate an estimated frequency offset value for the transition destination radio frequency, and a rotator that uses the estimated frequency offset value for the transition destination radio frequency to perform phase rotation on the received signal.
    Type: Grant
    Filed: February 19, 2018
    Date of Patent: March 8, 2022
    Assignee: HITACHI KOKUSAI ELECTRIC INC.
    Inventor: Kei Ito
  • Publication number: 20200336345
    Abstract: A wireless communication device includes frequency hopping means for changing a radio frequency based on a temporarily defined pattern, and a frequency offset compensation unit. The frequency offset compensation unit includes a frequency offset calculator that calculates a frequency offset amount from a received signal, a hopping frequency value converter that uses the frequency offset amount, a radio frequency from which the frequency offset amount is calculated, and a transition destination radio frequency transitioned by the frequency hopping means to calculate an estimated frequency offset value for the transition destination radio frequency, and a rotator that uses the estimated frequency offset value for the transition destination radio frequency to perform phase rotation on the received signal.
    Type: Application
    Filed: February 19, 2018
    Publication date: October 22, 2020
    Inventor: Kei ITO
  • Patent number: 10587330
    Abstract: A reception device including reception antennas is provided. In the reception device, a demodulation unit is configured to calculate, for each of a plurality of antenna combinations of the reception antennas, log likelihood ratios of coded bits of error correction code obtained from reception signals of the reception antennas. A mutual information amount calculation unit is configured to calculate an average mutual information amount based on the log likelihood ratios corresponding to each of the antenna combinations. An antenna combination selection unit is configured to output determination information for specifying one of the antenna combinations for which the average mutual information amount is the maximum. A signal selection unit is configured to select the log likelihood ratios corresponding to the specified antenna combination based on the determination information, and a decoding unit is configured to decodes the selected log likelihood ratios.
    Type: Grant
    Filed: February 21, 2018
    Date of Patent: March 10, 2020
    Assignee: HITACHI KOKUSAI ELECTRIC INC.
    Inventors: Daiki Hoshi, Tatsuhiro Nakada, Kei Ito, Hiroki Kato
  • Patent number: 10565636
    Abstract: According to one embodiment, an electronic apparatus includes a memory and a processor. The processor is coupled to the memory, and is configured to: receive first information including information indicative of a usage state of a device; detect a sign of mechanical failure of the device by analyzing the first information; acquire second information associated with a replacement product for the device of which the sign of mechanical failure is detected, the second information including information of at least one of an identical product and an alternative product to the device; and output the second information as information associated with the device of which the sign of mechanical failure is detected.
    Type: Grant
    Filed: April 28, 2017
    Date of Patent: February 18, 2020
    Assignee: Toshiba Client Solutions CO., LTD.
    Inventors: Kei Ito, Kouetsu Wada
  • Publication number: 20200036432
    Abstract: A reception device including reception antennas is provided. In the reception device, a demodulation unit is configured to calculate, for each of a plurality of antenna combinations of the reception antennas, log likelihood ratios of coded bits of error correction code obtained from reception signals of the reception antennas. A mutual information amount calculation unit is configured to calculate an average mutual information amount based on the log likelihood ratios corresponding to each of the antenna combinations. An antenna combination selection unit is configured to output determination information for specifying one of the antenna combinations for which the average mutual information amount is the maximum. A signal selection unit is configured to select the log likelihood ratios corresponding to the specified antenna combination based on the determination information, and a decoding unit is configured to decodes the selected log likelihood ratios.
    Type: Application
    Filed: February 21, 2018
    Publication date: January 30, 2020
    Applicant: HITACHI KOKUSAI ELECTRIC INC.
    Inventors: DAIKI HOSHI, TATSUHIRO NAKADA, KEI ITO, HIROKI KATO
  • Patent number: 10419084
    Abstract: A wireless communication device suppresses increase in computation scale when applying maximum likelihood detection to a multi-level modulation scheme. Units calculate a likelihood, bit log-likelihood ratio, and mutual information content for the separation result of a received signal on the basis of the signal point of a reference selected from among a plurality of signal points that a transmitted signal can assume. A transmission candidate point selection unit selects signal points in a number that corresponds to the mutual information content as transmission candidate points from among the plurality of signal points in ascending order of distance to 0 and distance to 1 for each modulation bit that constitutes the signal point of the reference. A reception candidate point that is a candidate for the received signal is calculated. An external LLR calculation unit calculates the bit log-likelihood ratio by an MLD method.
    Type: Grant
    Filed: May 12, 2017
    Date of Patent: September 17, 2019
    Assignee: HITACHI KOKUSAI ELECTRIC INC.
    Inventors: Kei Ito, Daiki Hoshi
  • Patent number: 10341153
    Abstract: A peak power reduction device includes a unit for dividing digital information to be transmitted into a plurality of streams; a unit for selecting the modulation level of the streams and distribution of transmission power according to a transmission state; a unit for performing singular-value decomposition on the transmission path characteristic of a streams and precoding the resultant data by a right singular value matrix; a unit for performing complex mapping on the subcarrier of a stream according to the modulation level; a unit for converting a complex mapping signal into a time domain signal; a first unit for storing a conversion result as a time domain signal; a second unit for calculating a peak time signal exceeding a predetermined threshold value from a peak value, if any exists, that exceeds a prescribed threshold value for the amplitude of the time domain signal.
    Type: Grant
    Filed: June 7, 2016
    Date of Patent: July 2, 2019
    Assignee: HITACHI KOKUSAI ELECTRIC INC.
    Inventors: Tatsuhiro Nakada, Hiroki Kato, Kei Ito, Satoru Ejima
  • Publication number: 20190089565
    Abstract: A peak power reduction device includes a unit for dividing digital information to be transmitted into a plurality of streams; a unit for selecting the modulation level of the streams and distribution of transmission power according to a transmission state; a unit for performing singular-value decomposition on the transmission path characteristic of a streams and precoding the resultant data by a right singular value matrix; a unit for performing complex mapping on the subcarrier of a stream according to the modulation level; a unit for converting a complex mapping signal into a time domain signal; a first unit for storing a conversion result as a time domain signal; a second unit for calculating a peak time signal exceeding a predetermined threshold value from a peak value, if any exists, that exceeds a prescribed threshold value for the amplitude of the time domain signal.
    Type: Application
    Filed: June 7, 2016
    Publication date: March 21, 2019
    Applicant: HITACHI KOKUSAI ELECTRIC INC.
    Inventors: Tatsuhiro NAKADA, Hiroki KATO, Kei ITO, Satoru EJIMA
  • Publication number: 20190089422
    Abstract: A wireless communication device suppresses increase in computation scale when applying maximum likelihood detection to a multi-level modulation scheme. Units calculate a likelihood, bit log-likelihood ratio, and mutual information content for the separation result of a received signal on the basis of the signal point of a reference selected from among a plurality of signal points that a transmitted signal can assume. A transmission candidate point selection unit selects signal points in a number that corresponds to the mutual information content as transmission candidate points from among the plurality of signal points in ascending order of distance to 0 and distance to 1 for each modulation bit that constitutes the signal point of the reference. A reception candidate point that is a candidate for the received signal is calculated. An external LLR calculation unit calculates the bit log-likelihood ratio by an MLD method.
    Type: Application
    Filed: May 12, 2017
    Publication date: March 21, 2019
    Inventors: Kei ITO, Daiki HOSHI
  • Patent number: 10033480
    Abstract: SISO decoding of a reception signal having a scrambled symbol arrangement is realized using a process having reduced complexity. Coordinates are generated for a reference point obtained by scrambling and mapping a symbol number not a symbol reference point position. This reference point simulates transmission-side scrambling and is generated for each symbol number by a first mapping unit. Because the binary expression of a corresponding original signal number is retained, a bit likelihood calculation unit can easily calculate a bit likelihood based on the distance between the reference point and a reception signal. The calculated bit likelihood is then deinterleaved and subjected to SISO error-correcting decoding. The thus obtained bit likelihood is then reinterleaved and used to calculate a symbol probability. Soft symbols are generated through the multiplication of all the calculated symbol probabilities by corresponding reference points output by a second mapping unit similar to the first mapping unit.
    Type: Grant
    Filed: February 16, 2017
    Date of Patent: July 24, 2018
    Assignee: HITACHI KOKUSAI ELECTRIC INC.
    Inventor: Kei Ito
  • Patent number: 10006106
    Abstract: Provided is a brass alloy excellent in recyclability and corrosion resistance while avoiding the addition of Bi and Si, and with which machinability is ensured and processing is facilitated with preventing inclusion of lead. The present invention includes at least 58.0 to 63.0 mass % of Cu, 1.0 to 2.0 mass % of Sn and 0.05 to 0.29 mass % of Sb and the remainder composed of Zn and unavoidable impurities. With the present invention, stress corrosion crack resistance and machinability are improved. 0.05 to 1.5 mass % of Ni is included in a copper alloy to improve stress corrosion crack resistance as a result of the interaction between Ni and Sb. Furthermore, 0.05 to 0.2 mass % of P is included to improve anti-dezincification properties.
    Type: Grant
    Filed: April 8, 2013
    Date of Patent: June 26, 2018
    Assignees: KITZ CORPORATION, KITZ METALWORKS CORPORATION
    Inventors: Hidenobu Tameda, Hisanori Terui, Kei Ito, Tomoyuki Ozasa
  • Patent number: 9967113
    Abstract: Disclosed is a reception apparatus that has solved a problem that fluctuations cannot be followed immediately after a commencement of turbo equalization in a high-speed fading environment. A reception apparatus includes a soft interference canceller, an MMSE equalizer, a likelihood calculator, a de-interleaver, an SISO decoder, an information bit hard decision unit, a subtracter, an interleaver, a soft estimation value calculator, a zero storage unit, a known signal memory unit, a transmission path estimator, and a plurality of switches. At the time of equalization, the transmission path estimator uses, as a reference signal, a known signal stored in the known signal memory unit or an output of the MMSE equalizer. Meanwhile, at the time of a first equalization, the soft interference canceller is given a ‘0’ value from the zero storage unit as a reference signal.
    Type: Grant
    Filed: September 15, 2016
    Date of Patent: May 8, 2018
    Assignee: HITACHI KOKUSAI ELECTRIC INC.
    Inventors: Kei Ito, Keisuke Yamamoto, Tatsuhiro Nakada
  • Patent number: 9853700
    Abstract: An object of the present invention is to generate a soft estimation value where missing of bit information is avoided and to implement turbo equalization processing in a wireless transmission apparatus and a wireless transmission system where termination processing is not performed in an error correction coding part and interleave processing over frames is performed. A wireless transmission system of the present invention includes a transmission apparatus and a reception apparatus. The transmission apparatus includes an error correction coding unit, a first interleave unit, a second interleave unit, and a digital modulation unit. The reception apparatus includes a unit that detects a reception signal, a demapper unit, a second deinterleave unit, a unit to store a received bit logarithm of likelihood ratio in a frame buffer, a frequency interleaver data extraction part that extracts data of a predetermined period, a decoding part, and a hard decision part.
    Type: Grant
    Filed: March 15, 2017
    Date of Patent: December 26, 2017
    Assignee: Hitachi Kokusai Electric Inc.
    Inventors: Daiki Hoshi, Tatsuhiro Nakada, Kei Ito
  • Patent number: 9822262
    Abstract: An object of the present invention is to find a cationic electrodeposition coating composition excellent in coating composition stability, finished appearance, and corrosion resistance, and to provide a coated article excellent in these coating film properties. The present invention provides a cationic electrodeposition coating composition containing a polyester resin (A), an amino group-containing epoxy resin (B), and a blocked polyisocyanate curing agent (C), the polyester resin (A) being present in an amount of 3 to 40 mass %, the amino group-containing epoxy resin (B) being present in an amount of 20 to 60 mass %, and the blocked polyisocyanate curing agent (C) being present in an amount of 10 to 40 mass %, based on the total mass of the components (A), (B), and (C) on a solids basis, wherein the solubility parameter ?A of the component (A) and the solubility parameter ?B of the component (B) satisfy the relationship |?A??B|<1.0.
    Type: Grant
    Filed: June 11, 2014
    Date of Patent: November 21, 2017
    Assignee: KANSAI PAINT CO., LTD.
    Inventors: Hideki Iijima, Kei Ito
  • Patent number: 9742595
    Abstract: When a channel between a transmission apparatus and a reception apparatus is distorted by multipath fading or other reasons, linear interpolation between pilot subcarriers produces a large estimation error, resulting in an increase in an equalization error and a decrease in reception performance. The present invention allows feedback of a signal that undergoes error correction, reduction in the channel estimation error through repeated channel estimation, and improvement in the reception performance.
    Type: Grant
    Filed: March 20, 2017
    Date of Patent: August 22, 2017
    Assignee: Hitachi Kokusai Electric, Inc.
    Inventor: Kei Ito
  • Publication number: 20170236181
    Abstract: According to one embodiment, an electronic apparatus includes a memory and a processor. The processor is coupled to the memory, and is configured to: receive first information including information indicative of a usage state of a device; detect a sign of mechanical failure of the device by analyzing the first information; acquire second information associated with a replacement product for the device of which the sign of mechanical failure is detected, the second information including information of at least one of an identical product and an alternative product to the device; and output the second information as information associated with the device of which the sign of mechanical failure is detected.
    Type: Application
    Filed: April 28, 2017
    Publication date: August 17, 2017
    Inventors: Kei ITO, Kouetsu WADA
  • Publication number: 20170195144
    Abstract: When a channel between a transmission apparatus and a reception apparatus is distorted by multipath fading or other reasons, linear interpolation between pilot subcarriers produces a large estimation error, resulting in an increase in an equalization error and a decrease in reception performance. The present invention allows feedback of a signal that undergoes error correction, reduction in the channel estimation error through repeated channel estimation, and improvement in the reception performance.
    Type: Application
    Filed: March 20, 2017
    Publication date: July 6, 2017
    Inventor: Kei ITO
  • Publication number: 20170187434
    Abstract: An object of the present invention is to generate a soft estimation value where missing of bit information is avoided and to implement turbo equalization processing in a wireless transmission apparatus and a wireless transmission system where termination processing is not performed in an error correction coding part and interleave processing over frames is performed. A wireless transmission system of the present invention includes a transmission apparatus and a reception apparatus. The transmission apparatus includes an error correction coding unit, a first interleave unit, a second interleave unit, and a digital modulation unit. The reception apparatus includes a unit that detects a reception signal, a demapper unit, a second deinterleave unit, a unit to store a received bit logarithm of likelihood ratio in a frame buffer, a frequency interleaver data extraction part that extracts data of a predetermined period, a decoding part, and a hard decision part.
    Type: Application
    Filed: March 15, 2017
    Publication date: June 29, 2017
    Inventors: Daiki HOSHI, Tatsuhiro NAKADA, Kei ITO
  • Publication number: 20170163379
    Abstract: SISO decoding of a reception signal having a scrambled symbol arrangement is realized using a process having reduced complexity. Coordinates are generated for a reference point obtained by scrambling and mapping a symbol number not a symbol reference point position. This reference point simulates transmission-side scrambling and is generated for each symbol number by a first mapping unit. Because the binary expression of a corresponding original signal number is retained, a bit likelihood calculation unit can easily calculate a bit likelihood based on the distance between the reference point and a reception signal. The calculated bit likelihood is then deinterleaved and subjected to SISO error-correcting decoding. The thus obtained bit likelihood is then reinterleaved and used to calculate a symbol probability. Soft symbols are generated through the multiplication of all the calculated symbol probabilities by corresponding reference points output by a second mapping unit similar to the first mapping unit.
    Type: Application
    Filed: February 16, 2017
    Publication date: June 8, 2017
    Applicant: HITACHI KOKUSAI ELECTRIC INC.
    Inventor: Kei ITO