Patents by Inventor Hidehiro Matsuoka
Hidehiro Matsuoka 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: 7103119Abstract: A beam formation circuit and an apparatus and a method of receiving radio frequency signals making use of a smart antenna are described in which the amount of computation tasks required for the weight calculation is significantly reduced. In realizing the directivity of the smart antenna, the output signals corresponding to a plurality of sub-carriers are weighted with a common antenna weight for each of the antenna elements.Type: GrantFiled: December 21, 2001Date of Patent: September 5, 2006Assignee: Kabushiki Kaisha ToshibaInventors: Hidehiro Matsuoka, Shuichi Obayashi
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Publication number: 20060114814Abstract: An OFDM demodulator that demodulates an OFDM signal includes an antenna that receives a signal including delayed signals, an estimation circuit that estimates the channel response of the received signal, and a control circuit that controls a length of a retention time interval based on the estimated channel response. The retention time interval includes a time period from the head of a delayed signal having a maximum delay time in the delayed signals to the tail of a preceding signal in the delayed signals based on the estimated channel response. The OFDM demodulator also includes a retention memory that retains a portion of the received signal corresponding to the retention time period, and a selection circuit that selects an OFDM symbol based on a calculation of a maximum likelihood that the retained received signal is equivalent to a signal replica based on the channel response.Type: ApplicationFiled: November 8, 2005Publication date: June 1, 2006Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Hideo Kasami, Hidehiro Matsuoka, Makoto Tsuruta
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Publication number: 20060115011Abstract: An OFDM receiver apparatus mounted on a movable object for receiving an OFDM signal, includes a plurality of directional antennas which receive an OFDM signal, an estimator to estimate a center frequency of a spectrum of a Doppler component from one of the received signals or a multiplexed signal obtained by multiplexing the received signals, a shift quantity calculator to calculate a shift quantity from the estimated center frequency of the estimator and directivity information representing directivity directions of the directional antennas, a plurality of frequency shifters to subject the received signals to frequency shift according to the shift quantity to compensate for Doppler shift, a combining unit to diversity-combine frequency shifted signals of the frequency shifters, and a demodulator/decoder to demodulate and decode combining diversity signals of the combining unit.Type: ApplicationFiled: November 29, 2005Publication date: June 1, 2006Inventors: Makoto Tsuruta, Hidehiro Matsuoka, Hideo Kasami
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Patent number: 7043275Abstract: In a radio communication apparatus, delay profiles of a desired wave and delay waves thereof are estimated by plural delay profile estimation sections for each of received signals from directional antennas constituting an array antenna. Received signals from the antennas selected by a reception antenna selector on the basis of the delay profile are subjected to a temporal/spatial equalization processing by an adaptive signal processing section and a path diversity combining section, thereby obtaining a reception output. An arrival angle range of the desired wave is estimated by a DOA estimation section from the delay profile estimated by the delay profile estimation section. Based on the arrival angle range, the antenna for transmission is selected by a transmission antenna selection section, and transmission signals are sent out.Type: GrantFiled: June 4, 2004Date of Patent: May 9, 2006Assignee: Kabushiki Kaisha ToshibaInventors: Hidehiro Matsuoka, Hiroki Shoki
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Patent number: 7043271Abstract: There is disclosed a radio communication system in which a constitution of a base station and further a control station can be simplified. A radio communication system according to the present invention converts a received signal received by a plurality of antenna elements in a base station to a signal of different frequency band, and then conflates the converted signal in order to generate sub-carrier wave multiplex signal. The signal is converted to an optical signal, and then the optical signal is transmitted to a control station via an optical fiber. Or the control station performs weighting to phase of the transmitted signal transmitted from a plurality of antennas of a base station, and then performs frequency conversion to different frequency band, and then conflates the converted signal in order to generate the sub-carrier wave multiplex signal. The signal is converted to an optical signal, and then an optical signal is transmitted to the base station side via the optical fiber.Type: GrantFiled: September 12, 2000Date of Patent: May 9, 2006Assignee: Kabushiki Kaisha ToshibaInventors: Ichiro Seto, Yasushi Murakami, Osamu Shibata, Hidehiro Matsuoka
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Publication number: 20060079290Abstract: There is disclosed a radio communication system in which a constitution of a base station and further a control station can be simplified. A radio communication system according to the present invention converts a received signal received by a plurality of antenna elements in a base station to a signal of different frequency band, and then conflates the converted signal in order to generate sub-carrier wavemultiplex signal. The signal is converted to an optical signal, and then the optical signal is transmitted to a control station via an optical fiber. Or the control station performs weighting to phase of the transmitted signal transmitted from a plurality of antennas of a base station, and then performs frequency conversion to different frequency band, and then conflates the converted signal in order to generate the sub-carrier wave multiplex signal. The signal is converted to an optical signal, and then an optical signal is transmitted to the base station side via the optical fiber.Type: ApplicationFiled: November 29, 2005Publication date: April 13, 2006Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Ichiro Seto, Yasushi Murakami, Osamu Shibata, Hidehiro Matsuoka
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Publication number: 20040235421Abstract: In a radio communication apparatus, delay profiles of a desired wave and delay waves thereof are estimated by plural delay profile estimation sections for each of received signals from directional antennas constituting an array antenna. Received signals from the antennas selected by a reception antenna selector on the basis of the delay profile are subjected to a temporal/spatial equalization processing by an adaptive signal processing section and a path diversity combining section, thereby obtaining a reception output. An arrival angle range of the desired wave is estimated by a DOA estimation section from the delay profile estimated by the delay profile estimation section. Based on the arrival angle range, the antenna for transmission is selected by a transmission antenna selection section, and transmission signals are sent out.Type: ApplicationFiled: June 4, 2004Publication date: November 25, 2004Inventors: Hidehiro Matsuoka, Hiroki Shoki
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Publication number: 20040192238Abstract: A receiver comprising: an antenna which receives a radio signal including N possible symbols {c1(n), c2(n), . . . cM−1(n), cM(n)}, an N correlation units which are provided corresponding to the N possible symbols, respectively, each correlation unit detecting the degree of correlation with the radio signal received by the antenna, and a symbol determination unit which determines the symbol included in the radio signal received by the antenna based on the degree of correlation detected by the N correlation units. The N correlation units detect the degree of correlation between the radio signal received by the antenna and the N possible symbols represented by M chips {&agr;0c1(n), &agr;0c2(n)+&agr;1c1(n), . . . , &agr;0cM−1(n)+&agr;1cM−2(n), &agr;0cM(n)+&agr;1cM−1(n)}.Type: ApplicationFiled: March 29, 2004Publication date: September 30, 2004Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Hideo Kasami, Hidehiro Matsuoka, Tsuguhide Aoki, Kazumi Sato
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Patent number: 6771988Abstract: In a radio communication apparatus, delay profiles of a desired wave and delay waves thereof are estimated by plural delay profile estimation sections for each of received signals from directional antennas constituting an array antenna. Received signals from the antennas selected by a reception antenna selector on the basis of the delay profile are subjected to a temporal/spatial equalization processing by an adaptive signal processing section and a path diversity combining section, thereby obtaining a reception output. An arrival angle range of the desired wave is estimated by a DOA estimation section from the delay profile estimated by the delay profile estimation section. Based on the arrival angle range, the antenna for transmission is selected by a transmission antenna selection section, and transmission signals are sent out.Type: GrantFiled: December 26, 2000Date of Patent: August 3, 2004Assignee: Kabushiki Kaisha ToshibaInventors: Hidehiro Matsuoka, Hiroki Shoki
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Publication number: 20040008614Abstract: This invention relates to improved antenna techniques, particularly for orthogonal frequency division multiplexed (OFDM) communications systems.Type: ApplicationFiled: January 28, 2003Publication date: January 15, 2004Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Hidehiro Matsuoka, Yong Sun
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Publication number: 20040001554Abstract: This invention relates to improved antenna techniques particularly for orthogonal frequency division multiplexed (OFDM) communications systems.Type: ApplicationFiled: March 11, 2003Publication date: January 1, 2004Applicant: Kabushiki Kaisha ToshibaInventors: Yong Sun, Hidehiro Matsuoka
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Publication number: 20020085653Abstract: A beam formation circuit and an apparatus and a method of receiving radio frequency signals making use of a smart antenna are described in which the amount of computation tasks required for the weight calculation is significantly reduced. In realizing the directivity of the smart antenna, the output signals corresponding to a plurality of sub-carriers are weighted with a common antenna weight for each of the antenna elements.Type: ApplicationFiled: December 21, 2001Publication date: July 4, 2002Applicant: KABUSHHIKI KAISHA TOSHIBAInventors: Hidehiro Matsuoka, Shuichi Obayashi
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Publication number: 20010049295Abstract: In a radio communication apparatus, delay profiles of a desired wave and delay waves thereof are estimated by plural delay profile estimation sections for each of received signals from directional antennas constituting an array antenna. Received signals from the antennas selected by a reception antenna selector on the basis of the delay profile are subjected to a temporal/spatial equalization processing by an adaptive signal processing section and a path diversity combining section, thereby obtaining a reception output. An arrival angle range of the desired wave is estimated by a DOA estimation section from the delay profile estimated by the delay profile estimation section. Based on the arrival angle range, the antenna for transmission is selected by a transmission antenna selection section, and transmission signals are sent out.Type: ApplicationFiled: December 26, 2000Publication date: December 6, 2001Inventors: Hidehiro Matsuoka, Hiroki Shoki
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Patent number: 6091364Abstract: A patch having a circular shape for instance is formed on the main surface of a substrate in the shape of, for example, an equilateral triangle. The center of the main surface of the patch is at a position different from the center of the substrate. A grounding conductor is disposed on the backside of the substrate. Power is supplied to the patch through, for example, a microstrip line, triplate line, coplanar waveguide, slot line or the like. An antenna configured as described above has the center of the patch at a position different from the center of the triangle substrate, so that beams can be tilted in a desired direction by a single patch and a single feeder circuit.Type: GrantFiled: June 30, 1997Date of Patent: July 18, 2000Assignee: Kabushiki Kaisha ToshibaInventors: Yasushi Murakami, Akihiro Tsujimura, Hisao Iwasaki, Hiroki Shoki, Hidehiro Matsuoka
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Patent number: 6061553Abstract: An adaptive antenna is disclosed, that comprises a plurality of antenna elements 1.sub.1, 1.sub.2, . . . , and 1.sub.N with different directivity, delay profile measuring units 2.sub.1, 2.sub.2, . . . , and 2.sub.N for estimating states of received signals of the antenna elements for each of delay times that have been designated, antenna selecting units 3.sub.1, 3.sub.2, . . . , and 3.sub.L for selecting a part of the antenna elements for each of the delay times corresponding to the estimated result, adaptive signal processing portions 4.sub.1, 4.sub.2, . . . , and 4.sub.L for determining the received signals of the part of the antenna elements that have been selected and multiplying the received signals to which relevant weights have been determined for each of the delay time and summing the weighted signals, delaying circuits 5.sub.2 and 5.sub.Type: GrantFiled: January 2, 1998Date of Patent: May 9, 2000Assignee: Kabushiki Kaisha ToshibaInventors: Hidehiro Matsuoka, Hiroki Shoki, Akihiro Tsujimura, Yasushi Murakami