Patents by Inventor Kensuke Sawada

Kensuke Sawada 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: 10715263
    Abstract: An information processing apparatus includes a memory, and a processor coupled to the memory and configured to obtain location information indicating locations of a wireless transmitter and a wireless receiver, simulate a first power of a first reception signal at the wireless receiver in a condition that a radio signal is transmitted from the wireless transmitter, identify a first probability distribution model in accordance with the first reception signal, identify a first parameter of the first probability distribution model in accordance with the first power and a propagation environment defined by the locations of the wireless transmitter and the wireless receiver indicated by the location information, and based on the first probability distribution model using the first parameter, simulate a second power of a second reception signal at around the wireless receiver.
    Type: Grant
    Filed: August 14, 2018
    Date of Patent: July 14, 2020
    Assignee: FUJITSU LIMITED
    Inventors: Akihiro Wada, Teruhisa Ninomiya, Makoto Hamaminato, Hiromasa Yamauchi, Kaoru Yokoo, Kensuke Sawada
  • Publication number: 20190068302
    Abstract: An information processing apparatus includes a memory, and a processor coupled to the memory and configured to obtain location information indicating locations of a wireless transmitter and a wireless receiver, simulate a first power of a first reception signal at the wireless receiver in a condition that a radio signal is transmitted from the wireless transmitter, identify a first probability distribution model in accordance with the first reception signal, identify a first parameter of the first probability distribution model in accordance with the first power and a propagation environment defined by the locations of the wireless transmitter and the wireless receiver indicated by the location information, and based on the first probability distribution model using the first parameter, simulate a second power of a second reception signal at around the wireless receiver.
    Type: Application
    Filed: August 14, 2018
    Publication date: February 28, 2019
    Applicant: FUJITSU LIMITED
    Inventors: Akihiro WADA, Teruhisa Ninomiya, Makoto HAMAMINATO, Hiromasa Yamauchi, Kaoru Yokoo, Kensuke SAWADA
  • Publication number: 20170265037
    Abstract: A method includes: receiving beacon signals transmitted by each of a plurality of beacon devices around a positioning target terminal; first calculating, based on the received beacon signals, location information indicating locations of a plurality of mobile beacon devices included in the plurality of beacon devices; selecting a plurality of second mobile beacon devices from among the plurality of mobile beacon devices by excluding one or more first mobile beacon devices having similar azimuth directions from the positioning target terminal among the plurality of mobile beacon devices based on the calculated location information; and second calculating by circuitry, based on the selected plurality of second mobile beacon devices, a location of the positioning target terminal.
    Type: Application
    Filed: February 21, 2017
    Publication date: September 14, 2017
    Applicant: FUJITSU LIMITED
    Inventors: Kensuke SAWADA, Shinichiro MORI
  • Patent number: 8811746
    Abstract: The mobile unit position detecting apparatus generates target data by extracting a target from an image shot by the image capturing device, extracts target setting data that best matches the target data, is prerecorded in a recording unit and is shot for each target, obtains a target ID corresponding to the extracted target setting data from the recording unit, detects position data associated with the obtained target ID, tracks the target in the image shot by the image capturing device, and calculates an aspect ratio of the target being tracked in the image. If the aspect ratio is equal to or lower than a threshold value, the mobile unit position detecting apparatus outputs the detected position data.
    Type: Grant
    Filed: January 17, 2012
    Date of Patent: August 19, 2014
    Assignee: Fujitsu Limited
    Inventor: Kensuke Sawada
  • Publication number: 20120189162
    Abstract: The mobile unit position detecting apparatus generates target data by extracting a target from an image shot by the image capturing device, extracts target setting data that best matches the target data, is prerecorded in a recording unit and is shot for each target, obtains a target ID corresponding to the extracted target setting data from the recording unit, detects position data associated with the obtained target ID, tracks the target in the image shot by the image capturing device, and calculates an aspect ratio of the target being tracked in the image. If the aspect ratio is equal to or lower than a threshold value, the mobile unit position detecting apparatus outputs the detected position data.
    Type: Application
    Filed: January 17, 2012
    Publication date: July 26, 2012
    Applicant: Fujitsu Limited
    Inventor: Kensuke Sawada
  • Patent number: 8074075
    Abstract: To provide an authentication technology making it compatible to facilitate inputting of authentication information and to ensure the security. An authentication device connected to a transmitting terminal and a receiving terminal via a communication line, receives a message from the transmitting terminal, receives authentication information from the transmitting terminal, registers the message in association with the authentication information, receives a request with a purport of acquiring the message from the receiving terminal, determines, based on the authentication information received from the receiving terminal and the registered authentication information, whether to authenticate or not, and, if authenticated, transmits the message to the receiving terminal.
    Type: Grant
    Filed: December 21, 2005
    Date of Patent: December 6, 2011
    Assignee: Fujitsu Limited
    Inventor: Kensuke Sawada
  • Patent number: 7889694
    Abstract: A communication apparatus and method for channel switching for ad-hoc communication provides effective utilization of an infrastructure communication channel while preventing a deterioration in the quality of the infrastructure communication affected by a transmission signal used in the ad-hoc communication. Typically, the number of channels that can be used for a second communication is increased.
    Type: Grant
    Filed: July 6, 2007
    Date of Patent: February 15, 2011
    Assignee: Fujitsu Limited
    Inventors: Kazumasa Ushiki, Kensuke Sawada, Mitsunori Fukazawa
  • Publication number: 20100245174
    Abstract: A positioning device includes: a device body; a direction change detecting section that detects whether a traveling direction of the device body has been changed based on a detection of an azimuth with respect to reference axes preset in the device body; and an absolute position acquiring section that acquires an absolute position of the device body at a timing based on a change of the moving direction of the device body as detected by the direction change detecting section.
    Type: Application
    Filed: March 23, 2010
    Publication date: September 30, 2010
    Applicant: FUJITSU LIMITED
    Inventors: Kyouko Okuyama, Kensuke Sawada, Shinichiro Mori
  • Patent number: 7729320
    Abstract: A mobile station enables communication with a fixed station and other mobile stations. The mobile station includes a receiving unit receiving first timing information, second timing information and reliability information with regard to the second timing information. A selector selects a timing, to be used for communication timing with the fixed station or the other mobile stations, between the first timing information and the second timing information based on the reliability information.
    Type: Grant
    Filed: November 14, 2006
    Date of Patent: June 1, 2010
    Assignee: Fujitsu Limited
    Inventor: Kensuke Sawada
  • Patent number: 7545884
    Abstract: A digital baseband modulation apparatus includes: a spread modulation part for complex spreading an I component signal and a Q component signal of a send signal so as to output an output signal; and an amplitude conversion part for decreasing the amplitude component of the output signal to the half when the output signal is output on the I axis or on the Q axis.
    Type: Grant
    Filed: January 14, 2004
    Date of Patent: June 9, 2009
    Assignee: Fujitsu Limited
    Inventor: Kensuke Sawada
  • Publication number: 20080008132
    Abstract: A communication apparatus and method for channel switching for ad-hoc communication provides effective utilization of an infrastructure communication channel while preventing a deterioration in the quality of the infrastructure communication affected by a transmission signal used in the ad-hoc communication. Typically, the number of channels that can be used for a second communication is increased.
    Type: Application
    Filed: July 6, 2007
    Publication date: January 10, 2008
    Inventors: Kazumasa Ushiki, Kensuke Sawada, Mitsunori Fukazawa
  • Publication number: 20070249298
    Abstract: A communication apparatus based on the multi-carrier modulation system may be included in a mobile station or a base station for simultaneous transmission and reception with a simplified structure between the mobile station and base station using in common the same frequency band. A communication apparatus based on a multi-carrier modulation system for simultaneous communications with a plurality of sub-carriers using a plurality of sub-carriers modulated with data respectively, comprising a transmitting unit operable to transmit data with a plurality of sub-carriers by modulating a sub-carrier among the plurality of sub-carriers with data, and operable to use the other sub-carriers a receiving band without modulation with the data.
    Type: Application
    Filed: September 28, 2006
    Publication date: October 25, 2007
    Inventor: Kensuke Sawada
  • Publication number: 20070135115
    Abstract: A mobile station enables communication with a fixed station and other mobile stations. The mobile station includes a receiving unit receiving first timing information, second timing information and reliability information with regard to the second timing information. A selector selects a timing, to be used for communication timing with the fixed station or the other mobile stations, between the first timing information and the second timing information based on the reliability information.
    Type: Application
    Filed: November 14, 2006
    Publication date: June 14, 2007
    Applicant: FUJITSU LIMITED
    Inventor: Kensuke Sawada
  • Publication number: 20070135150
    Abstract: To reduce the processing load such as channel assignment and an authentication process in a plurality of radio base stations and communication terminals, and quickly and efficiently assign channels to the communication channels. The channel assigning method by a radio base station group, includes determining assignment of a communication channel between a communication terminal entering a radio area of the radio station group and all radio base stations within the radio station group by a base station in the radio base station group. Channel assigning information common to the radio base station group is updated as to the determined communication channel and a communication channel is assigned to the communication terminal with reference to the channel assigning information by each radio base station in the radio base station group other than the radio base station.
    Type: Application
    Filed: December 6, 2006
    Publication date: June 14, 2007
    Applicant: FUJITSU LIMITED
    Inventors: Kazumasa Ushiki, Kensuke Sawada, Mitsunori Fukazawa, Naofumi Okubo
  • Publication number: 20070135041
    Abstract: A mobile radio system for radio communications between a base station and a plurality of mobile stations, as well as among a plurality of mobile stations, including a mobile radio channel assignment method, where each mobile station is capable of acquiring position information of the current position of the mobile station, as well as assigning a frequency channel for radio communications. The mobile station transmits and receives information using the assigned frequency channel, corresponding to the acquired position information.
    Type: Application
    Filed: December 6, 2006
    Publication date: June 14, 2007
    Applicant: FUJITSU LIMITED
    Inventors: Kensuke Sawada, Kazumasa Ushiki, Mitsunori Fukazawa, Hirokazu Murakami
  • Publication number: 20070133491
    Abstract: To effectively utilize an infrastructure communication channel and increase a number of channels available for ad-hoc communication in a mobile communication apparatus enabling communication in an infrastructure communication mode for radio communication via a base station and in an ad-hoc communication mode for direct radio communication with another mobile communication apparatus, by providing a communication channel recognizer to recognize an infrastructure communication channel which does not interfere with an infrastructure communication within a radio service area of a base station, from among the infrastructure communication channels assigned for the infrastructure communication and a communication channel diverter to control utilizing a infrastructure communication channel, recognized by the communication channel recognizer, as a channel for the ad-hoc communication mode.
    Type: Application
    Filed: November 27, 2006
    Publication date: June 14, 2007
    Applicant: Fujitsu Limited
    Inventors: Kazumasa Ushiki, Kensuke Sawada, Mitsunori Fukazawa
  • Publication number: 20070049270
    Abstract: An appearance of other mobile wireless station within a communication area of a second wireless communication system of a main mobile wireless station when the main mobile wireless station is in the communication area of a wireless base station of the first wireless communication system, is automatically detected. Communications with other mobile wireless station are autonomously started by a second wireless communication system and communications with the wireless base station are performed by the first wireless communication system. Communication content from the wireless base station of the first wireless communication system and communication content from the other mobile wireless station of the second wireless communication system are mutually relayed. The relay control is terminated when the other mobile wireless station moves outside the communication area of the second wireless communication system of the main mobile wireless station.
    Type: Application
    Filed: October 31, 2006
    Publication date: March 1, 2007
    Inventor: Kensuke Sawada
  • Publication number: 20070038860
    Abstract: To provide an authentication technology making it compatible to facilitate inputting of authentication information and to ensure the security. An authentication device connected to a transmitting terminal and a receiving terminal via a communication line, receives a message from the transmitting terminal, receives authentication information from the transmitting terminal, registers the message in association with the authentication information, receives a request with a purport of acquiring the message from the receiving terminal, determines, based on the authentication information received from the receiving terminal and the registered authentication information, whether to authenticate or not, and, if authenticated, transmits the message to the receiving terminal.
    Type: Application
    Filed: December 21, 2005
    Publication date: February 15, 2007
    Inventor: Kensuke Sawada
  • Patent number: 7170925
    Abstract: In a CDMA receiver for applying despread processing to direct wave or delayed waves that arrive via each path of multiple paths, applying synchronous detection processing to the despread signals obtained, combining the detection signals of respective paths and discriminating the received data on the basis of the combined signal, (1) a weighting unit provided for every path measures power of delayed received waves that arrive via its own path and, if the reception power is less than a set level (breakpoint level), subjects an output signal to weighting conforming to the reception power; (2) a RAKE combiner combines signals output from the weighting units of the respective paths; and (3) a data discrimination unit discriminates receive data based upon the output signal of the combiner.
    Type: Grant
    Filed: February 13, 2002
    Date of Patent: January 30, 2007
    Assignee: Fujitsu Limited
    Inventors: Noriyuki Kawaguchi, Satoshi Nakamura, Kensuke Sawada, Dai Kimura, Tokuro Kubo, Morihiko Minowa
  • Patent number: 7139589
    Abstract: An appearance of other mobile wireless station within a communication area of a second wireless communication system of a main mobile wireless station when the main mobile wireless station is in the communication area of a wireless base station of the first wireless communication system, is automatically detected. Communications with other mobile wireless station are autonomously started by a second wireless communication system and communications with the wireless base station are performed by the first wireless communication system. Communication content from the wireless base station of the first wireless communication system and communication content from the other mobile wireless station of the second wireless communication system are mutually relayed. The relay control is terminated when the other mobile wireless station moves outside the communication area of the second wireless communication system of the main mobile wireless station.
    Type: Grant
    Filed: March 4, 2005
    Date of Patent: November 21, 2006
    Assignee: Fujitsu Limited
    Inventor: Kensuke Sawada