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).
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Patent number: 8027392Abstract: 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: GrantFiled: November 30, 2005Date of Patent: September 27, 2011Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Yoshitaka Hara, Akinori Taira
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Patent number: 7965619Abstract: 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: GrantFiled: July 5, 2007Date of Patent: June 21, 2011Assignee: Mitsubishi Electric CorporationInventors: Akinori Taira, Yasunori Katou, Yoshitaka Hara
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Publication number: 20100329385Abstract: 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: ApplicationFiled: September 10, 2010Publication date: December 30, 2010Inventors: Noriharu Suematsu, Kouji Tsutsumi, Yasushi Sogabe, Toshihisa Kamemaru, Yoshihiko Konishi, Masataka Otsuka, Ryoji Hayashi, Akinori Taira
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Patent number: 7848458Abstract: 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: GrantFiled: February 16, 2006Date of Patent: December 7, 2010Assignee: Mitsubishi Electric CorporationInventors: Mari Ochiai, Akinori Taira, Yoshitaka Hara
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Patent number: 7817742Abstract: 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: GrantFiled: July 30, 2004Date of Patent: October 19, 2010Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Noriharu Suematsu, Kouji Tsutsumi, Yasushi Sogabe, Toshihisa Kamemaru, Yoshihiko Konishi, Masataka Otsuka, Ryoji Hayashi, Akinori Taira
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Patent number: 7764930Abstract: 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: GrantFiled: November 30, 2006Date of Patent: July 27, 2010Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Akinori Taira, Fumio Ishizu, Keishi Murakami
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Publication number: 20100150013Abstract: 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: ApplicationFiled: January 10, 2008Publication date: June 17, 2010Applicant: Mitsubishi Electric CorporationInventors: Yoshitaka Hara, Akinori Taira, Kenichi Tajima, Kazunari Kihira, Michiaki Takano, Kazuaki Ishioka, Yasunori Nouda
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Publication number: 20100016023Abstract: 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: ApplicationFiled: August 29, 2007Publication date: January 21, 2010Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Takahisa Yamauchi, Yukimasa Nagai, Akinori Taira
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Publication number: 20090196368Abstract: 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: ApplicationFiled: April 6, 2009Publication date: August 6, 2009Applicant: MITSUBISHI DENKI KABUSHIKI KAISHAInventors: Yoshitaka Hara, Akinori Taira, Tomoaki Otsuki, Kenji Suto
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Publication number: 20090196203Abstract: 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: ApplicationFiled: July 5, 2007Publication date: August 6, 2009Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Akinori Taira, Yasunori Katou, Yoshitaka Hara
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Publication number: 20090125778Abstract: 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: ApplicationFiled: November 1, 2006Publication date: May 14, 2009Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Shigeru Uchida, Toshiyuki Kuze, Wataru Matsumoto, Akinori Taira, Yukimasa Nagai
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Publication number: 20090029710Abstract: 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: ApplicationFiled: February 16, 2006Publication date: January 29, 2009Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Mari Ochiai, Akinori Taira, Yoshitaka Hara
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Publication number: 20090022231Abstract: 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: ApplicationFiled: February 16, 2006Publication date: January 22, 2009Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Mari Ochiai, Akinori Taira, Yoshitaka Hara
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Patent number: 7477878Abstract: 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: GrantFiled: December 24, 2003Date of Patent: January 13, 2009Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Akinori Taira, Fumio Ishizu, Keishi Murakami
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Patent number: 7406055Abstract: A radio communication apparatus at a transmission side that includes a plurality of transmission antennas and performs a communication using at least one carrier. The radio communication apparatus includes a channel dividing unit configured to divide a transmission signal into a plurality of channels based on channel structure information returned from another radio communication apparatus at a reception side and indicating a structure of a space-division-multiplexing-channel and a space-time-coding channel between transmission and reception antennas, and a space-time-coding unit configured to realize transmission diversity by performing a space-time-coding processing for each of the plurality of channels.Type: GrantFiled: March 18, 2004Date of Patent: July 29, 2008Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Akinori Taira, Fumio Ishizu
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Publication number: 20080094176Abstract: A radio-communication control apparatus controls a plurality of read/write devices that perform reading and writing of data with respect to a plurality of radio tags. A collecting unit collects, from the read/write devices, interference information on interference of reception signals received from the radio tags by the read/write devices. A timing determining unit determines a transmission timing at which the read/write devices transmit information to the radio tags, based on the collected interference information. The read/write devices transmit information to the radio tags based on the determined transmission timing.Type: ApplicationFiled: July 29, 2004Publication date: April 24, 2008Applicant: MITSUBISHI ELECTRIC CORPORATIONInventor: Akinori Taira
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Publication number: 20080056217Abstract: 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 to calculate transmission-related information corresponding to the pilot signal, and then selects, based on this calculated information, a signal to be sent to and utilized by the transmitter. The receiver then informs the selected signal to the transmitter. The transmitter selects, from the informed signal, transmission antennas and uses them to transmit information signals, so that a signal separation can be easily performed at the receiving end.Type: ApplicationFiled: July 29, 2004Publication date: March 6, 2008Applicant: MITSUBISHI DENKI KABUSIKI KAISHAInventors: Yoshitaka Hara, Akinori Taira, Tomoaki Otsuki, Kenji Suto
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Publication number: 20070081585Abstract: 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: ApplicationFiled: July 30, 2004Publication date: April 12, 2007Inventors: Noriharu Suematsu, Kouji Tsutsumi, Yasushi Sogabe, Toshihisa Kamemaru, Yoshihiko Konishi, Masataka Otsuka, Ryoji Hayashi, Akinori Taira
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Publication number: 20070072566Abstract: 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: ApplicationFiled: November 30, 2006Publication date: March 29, 2007Inventors: Akinori Taira, Fumio Ishizu, Keishi Murakami
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Publication number: 20070021130Abstract: In a communication device at a transmitting side, a by-channel pilot generator generates pilot signals by channels which are spread with a code orthogonal between channels. A common pilot generator generates a pilot signal common to multiple channels. Adders allocate user data, the common pilot signal, and the pilot signals by channels according to a prescribed frame format, thereby generating transmission signals by channels. In a communication device at a receiving side, a time synchronizing unit and a frequency synchronizing unit establish a timing synchronization and a frequency synchronization using the common pilot signal. A by-channel pilot extractor extracts the pilot signals by channels from a reception signal, after the timing synchronization is established.Type: ApplicationFiled: January 28, 2004Publication date: January 25, 2007Inventor: Akinori Taira