Patents by Inventor Akinori Taira

Akinori Taira 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: 20150263773
    Abstract: A radio communication apparatus includes antennas, transceiver units respectively connected to the antennas, and a radio control unit that controls the transceiver units, simultaneously inputs same transmission data to the transceiver units, and instructs, every switching cycle of frequency hopping, the transceiver units to start check processing for an idle state of frequency channels. The transceiver units respectively include hopping control units that switch the frequency channels every fixed time in synchronization with a communication partner and control such that each of the transceiver units uses a different frequency at the same hour. When determining that a frequency channel is in an idle state before a predetermined time elapses from the start of the check processing for an idle state, the transceiver units transmit the transmission data to the communication partner using the frequency channel.
    Type: Application
    Filed: September 21, 2012
    Publication date: September 17, 2015
    Applicant: Mitsubishi Electric Corporation
    Inventors: Kazumasa SUZUKI, Hiroyasu SANO, Akinori TAIRA
  • Publication number: 20150215935
    Abstract: A radio communication apparatus includes a FH control unit controlling frequency hopping for changing a frequency channel for each frame, a carrier sense unit performing carrier sense, for each of slots obtained by dividing the frame, a modulating unit determining transmission timing in the slot on the basis of a result of the carrier sense, a successive-transmission control unit generating a plurality of pieces of same data by duplicating transmission data, and a scheduler allocating, for each slot, a different communication time period to each mobile station. The radio communication apparatus transmits, on the basis of an allocation result of the communication time period, the transmission timing, and the instruction by the hopping control unit, the same data generated from same transmission data to the mobile stations in the frames different from each other and notifies the mobile stations of the allocation result.
    Type: Application
    Filed: September 21, 2012
    Publication date: July 30, 2015
    Applicant: Mitsubishi Electric Corporation
    Inventor: Akinori Taira
  • Publication number: 20140300448
    Abstract: An in-vehicle device stores a Wake Up pattern, which notifies a mobile device of a start of communication, in an area before a data storage area of a frame and transmits the frame, the mobile device includes a modulation/demodulation circuit and a microcomputer that perform a predetermined reception process on a reception signal, a pattern determination circuit that, when the reception signal includes a Wake Up pattern, determines to start communication and activates the modulation/demodulation circuit and the microcomputer, a power detection circuit that detects power of the reception signal, and, when power is detected for a certain period of time or longer, activates the pattern determination circuit, and a Wake-Up control unit that activates the power detection circuit for a predetermined time with a constant period during a time period other than during communication.
    Type: Application
    Filed: October 10, 2012
    Publication date: October 9, 2014
    Applicant: Mitsubishi Electric Corporation
    Inventors: Mari Ochiai, Akinori Taira
  • Patent number: 8385295
    Abstract: Conventionally, if the number of transmission antennas is greater than that of reception antennas, different signals simultaneously transmitted from the transmission antennas cannot be separated from one another at the receiving end, resulting in a significant degradation of received-signal quality. A transmitter and a receiver each have a plurality of antennas. The transmitter transmits a pilot signal. The receiver receives the pilot signal, calculates transmission-related information corresponding to the pilot signal, selects, based on this calculated information, a transmission signal to be used by the transmitter, and notifies the transmitter of the selected signal. The transmitter selects, from the informed transmission signal, transmission antennas and uses the selected antennas to transmit information signals, so that a signal separation can be easily performed at the receiving end.
    Type: Grant
    Filed: February 9, 2012
    Date of Patent: February 26, 2013
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yoshitaka Hara, Akinori Taira, Tomoaki Otsuki, Kenji Suto
  • Patent number: 8379758
    Abstract: When transmitting an RF signal for power supply or a pulse signal for data transmission, amplification is made in such a manner that the peak power of the RF signal becomes greater than the peak power of the pulse signal. Thus transmitting the RF signal with the greater peak power enables charging of a capacitor 23 of noncontact wireless communication equipment 2 even if the distance to the noncontact wireless communication equipment 2 is long.
    Type: Grant
    Filed: September 10, 2010
    Date of Patent: February 19, 2013
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Noriharu Suematsu, Kouji Tsutsumi, Yasushi Sogabe, Toshihisa Kamemaru, Yoshihiko Konishi, Masataka Otsuka, Ryoji Hayashi, Akinori Taira
  • Patent number: 8325701
    Abstract: A base station of a radio communication system emits a radio wave having the same frequency by time division toward a plurality of specific areas from a plurality of antenna elements by using a multiple-beam antenna to form a plurality of spot beams, and transmits broadcast information through a plurality of beacon channels. Upon reception of the broadcast information, a terminal that exists in any one of the plurality of specific areas selects an optimum beacon channel, and transmits a communication establishment request and a bandwidth request to the base station through a request channel corresponding to information for identifying the antenna element, which is included in the broadcast information received through the selected optimum beacon channel. Upon reception of the requests, the base station schedules, when a channel is to be allocated, a channel allocation time including downlink and uplink data bandwidths and the like.
    Type: Grant
    Filed: August 29, 2007
    Date of Patent: December 4, 2012
    Assignee: Mitsubishi Electric Corporation
    Inventors: Takahisa Yamauchi, Yukimasa Nagai, Akinori Taira
  • Publication number: 20120134437
    Abstract: Conventionally, if the number of transmission antennas is greater than that of reception antennas, different signals simultaneously transmitted from the transmission antennas cannot be separated from one another at the receiving end, resulting in a significant degradation of received-signal quality. A transmitter and a receiver each have a plurality of antennas. The transmitter transmits a pilot signal. The receiver receives the pilot signal, calculates transmission-related information corresponding to the pilot signal, selects, based on this calculated information, a transmission signal to be used by the transmitter, and notifies the transmitter of the selected signal. The transmitter selects, from the informed transmission signal, transmission antennas and uses the selected antennas to transmit information signals, so that a signal separation can be easily performed at the receiving end.
    Type: Application
    Filed: February 9, 2012
    Publication date: May 31, 2012
    Applicant: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yoshitaka HARA, Akinori TAIRA, Tomoaki OTSUKI, Kenji SUTO
  • Patent number: 8125963
    Abstract: A radio communication method and apparatus generate a plurality of information signals and transmit the signals to a communication partner from a plurality of antennas. A plurality of combination of signals to be transmitted are selected. A transmission evaluation value is determined based on the signal noise ratio of each signal. After all combinations are evaluated, a transmission format suitable for sending a combination of signals is determined based on a highest evaluation value.
    Type: Grant
    Filed: July 29, 2004
    Date of Patent: February 28, 2012
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yoshitaka Hara, Akinori Taira, Tomoaki Otsuki, Kenji Sudo
  • Patent number: 8027392
    Abstract: A method for transmitting information between at least two transceivers TRA and TRB linked together by a communication channel, said information being carried by means of at least one carrying signal Csg having an operating frequency, includes, according to the invention, a frequency selection step in the course of which said operating frequency is dynamically selected among frequencies comprised within at least a first and a second non-adjacent frequency intervals.
    Type: Grant
    Filed: November 30, 2005
    Date of Patent: September 27, 2011
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yoshitaka Hara, Akinori Taira
  • Patent number: 7965619
    Abstract: The present invention relates to a wireless communication system that performs data communication using a spatial multiplex transmission scheme. A mobile station includes a transmission weight calculating unit that calculates a transmission weight and a beam information notifying signal generating unit that transmits a known signal for generating partial space information at a base station side. A base station includes a scheduling unit (DL spatial scheduling unit (17), UL spatial scheduling unit (18), and beam information notifying signal response vector estimating unit (20)) that generates the partial space information based on a received first known signal, and performs downstream scheduling and upstream scheduling based on the partial space information, and a scheduling result transmitting unit (UL control information generating unit (14) and transmission weight calculating unit (19)) that transmits a packet including an upstream scheduling result.
    Type: Grant
    Filed: July 5, 2007
    Date of Patent: June 21, 2011
    Assignee: Mitsubishi Electric Corporation
    Inventors: Akinori Taira, Yasunori Katou, Yoshitaka Hara
  • Publication number: 20100329385
    Abstract: When transmitting an RF signal for power supply or a pulse signal for data transmission, amplification is made in such a manner that the peak power of the RF signal becomes greater than the peak power of the pulse signal. Thus transmitting the RF signal with the greater peak power enables charging of a capacitor 23 of noncontact wireless communication equipment 2 even if the distance to the noncontact wireless communication equipment 2 is long.
    Type: Application
    Filed: September 10, 2010
    Publication date: December 30, 2010
    Inventors: Noriharu Suematsu, Kouji Tsutsumi, Yasushi Sogabe, Toshihisa Kamemaru, Yoshihiko Konishi, Masataka Otsuka, Ryoji Hayashi, Akinori Taira
  • Patent number: 7848458
    Abstract: A communication apparatus associated with a system that uses two or more discontinuous frequency bands. The communication apparatus includes a BPF (band pass filter) including a plurality of BPFs associated with signals having respective frequency bands; a controller that controls each unit to transmit/receive the signals having the respective frequency bands; a down-converter that down-converts a filtered signal into a baseband signal while switching frequencies under control of the controller; a receiver that performs predetermined reception processing under control of the controller; and a transmitter that performs predetermined transmission processing under control of the controller, and common hardware is used in communication in all frequency bands with respect to processing of the baseband signal.
    Type: Grant
    Filed: February 16, 2006
    Date of Patent: December 7, 2010
    Assignee: Mitsubishi Electric Corporation
    Inventors: Mari Ochiai, Akinori Taira, Yoshitaka Hara
  • Patent number: 7817742
    Abstract: When transmitting an RF signal for power supply or a pulse signal for data transmission, amplification is made in such a manner that the peak power of the RF signal becomes greater than the peak power of the pulse signal. Thus transmitting the RF signal with the greater peak power enables charging of a capacitor 23 of noncontact wireless communication equipment 2 even if the distance to the noncontact wireless communication equipment 2 is long.
    Type: Grant
    Filed: July 30, 2004
    Date of Patent: October 19, 2010
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Noriharu Suematsu, Kouji Tsutsumi, Yasushi Sogabe, Toshihisa Kamemaru, Yoshihiko Konishi, Masataka Otsuka, Ryoji Hayashi, Akinori Taira
  • Patent number: 7764930
    Abstract: In a data transmission system, a transmitter adds control data to transmission data, and modulates the resultant signal by a predetermined modulation method, and sends the result in a wireless manner. A receiver detects a reception power intensity by use of the control data contained in the transmitted signal. A random pattern is used for a reception-power detecting portion for detecting a reception power intensity, which is contained in the control data.
    Type: Grant
    Filed: November 30, 2006
    Date of Patent: July 27, 2010
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Akinori Taira, Fumio Ishizu, Keishi Murakami
  • Publication number: 20100150013
    Abstract: A calibration method according to the present invention includes a step of first channel estimating for transmitting a pilot signal from a first antenna and receiving the pilot signal at a second antenna different from the first antenna to calculate a first channel estimation value; a step of second channel estimating for transmitting a plot signal from the second antenna and receiving the pilot signal at the first antenna to calculate a second channel estimation value; and a step of correction coefficient calculating for calculating, by using the first and second channel estimation values, a correction coefficient.
    Type: Application
    Filed: January 10, 2008
    Publication date: June 17, 2010
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yoshitaka Hara, Akinori Taira, Kenichi Tajima, Kazunari Kihira, Michiaki Takano, Kazuaki Ishioka, Yasunori Nouda
  • Publication number: 20100016023
    Abstract: A base station of a radio communication system emits a radio wave having the same frequency by time division toward a plurality of specific areas from a plurality of antenna elements by using a multiple-beam antenna to form a plurality of spot beams, and transmits broadcast information through a plurality of beacon channels. Upon reception of the broadcast information, a terminal that exists in any one of the plurality of specific areas selects an optimum beacon channel, and transmits a communication establishment request and a bandwidth request to the base station through a request channel corresponding to information for identifying the antenna element, which is included in the broadcast information received through the selected optimum beacon channel. Upon reception of the requests, the base station schedules, when a channel is to be allocated, a channel allocation time including downlink and uplink data bandwidths and the like.
    Type: Application
    Filed: August 29, 2007
    Publication date: January 21, 2010
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Takahisa Yamauchi, Yukimasa Nagai, Akinori Taira
  • Publication number: 20090196203
    Abstract: The present invention relates to a wireless communication system that performs data communication using a spatial multiplex transmission scheme. A mobile station includes a transmission weight calculating unit that calculates a transmission weight and a beam information notifying signal generating unit that transmits a known signal for generating partial space information at a base station side. A base station includes a scheduling unit (DL spatial scheduling unit (17), UL spatial scheduling unit (18), and beam information notifying signal response vector estimating unit (20)) that generates the partial space information based on a received first known signal, and performs downstream scheduling and upstream scheduling based on the partial space information, and a scheduling result transmitting unit (UL control information generating unit (14) and transmission weight calculating unit (19)) that transmits a packet including an upstream scheduling result.
    Type: Application
    Filed: July 5, 2007
    Publication date: August 6, 2009
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Akinori Taira, Yasunori Katou, Yoshitaka Hara
  • Publication number: 20090196368
    Abstract: Conventionally, if the number of transmission antennas is greater than that of reception antennas, different signals simultaneously transmitted from the transmission antennas cannot be separated from one another at the receiving end, resulting in a significant degradation of received-signal quality. A transmitter and a receiver each have a plurality of antennas. The transmitter transmits a pilot signal. The receiver receives the pilot signal, calculates transmission-related information corresponding to the pilot signal, selects, based on this calculated information, a transmission signal to be used by the transmitter, and notifies the transmitter of the selected signal. The transmitter selects, from the informed transmission signal, transmission antennas and uses the selected antennas to transmit information signals, so that a signal separation can be easily performed at the receiving end.
    Type: Application
    Filed: April 6, 2009
    Publication date: August 6, 2009
    Applicant: MITSUBISHI DENKI KABUSHIKI KAISHA
    Inventors: Yoshitaka Hara, Akinori Taira, Tomoaki Otsuki, Kenji Suto
  • Publication number: 20090125778
    Abstract: Within a communication system in which an ARQ control is exercised, in a transmission-side communication apparatus 11, a transmission scheduling unit 113 determines a transmission amount to be transmitted to a reception-side communication apparatus 21; an erasure correction encoding unit 112 performs an erasure correction encoding process on an information packet group that is made up of a plurality of packets to be transmitted so as to generate one or more erasure correction coded packets that fit the transmission amount instructed by the transmission scheduling unit 113 and specifies the one or more erasure correction coded packets as a unit of delivery confirmation; and a modulating unit 115 transmits a transmission data signal that has been generated by performing a predetermined modulation process on each of the erasure correction coded packets.
    Type: Application
    Filed: November 1, 2006
    Publication date: May 14, 2009
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Shigeru Uchida, Toshiyuki Kuze, Wataru Matsumoto, Akinori Taira, Yukimasa Nagai
  • Publication number: 20090029710
    Abstract: In a radio communication system that simultaneously provides communication service using a plurality of discontinuous frequency bands, a multi-band radio communication method according to the present invention is a method in which a base station constituting the system allocates a band to a mobile station that requests a communication starting. For example, a specific receiving unit within the base station extracts control information concerning a channel state in each of the frequency bands, and recognizes a frequency band in which the mobile station can receive information, from a result of the extraction. A channel controller 9 determines, starting from a high frequency band, whether a new traffic responding to the communication starting request can be allocated in each frequency band.
    Type: Application
    Filed: February 16, 2006
    Publication date: January 29, 2009
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Mari Ochiai, Akinori Taira, Yoshitaka Hara