Patents by Inventor Tsuguhide Aoki
Tsuguhide Aoki 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: 7502407Abstract: A wireless communication system which transmits and receives a signal by using a plurality of wireless apparatuses, comprising: a first wireless apparatus group having a plurality of transmitting apparatuses, each transmitting a wireless signal based on a first control signal, said first wireless apparatus group forming a first ad-hoc network between said transmitting apparatuses; and a second wireless apparatus group having a plurality of destination apparatuses, each receiving the wireless signal transmitted from said first wireless apparatus group, said second wireless apparatus group transmitting and receiving the wireless signal received by said destination apparatuses based on a second control signal, and said second wireless apparatus group forming a second ad-hoc network between said destination apparatuses different from said first ad-hoc network.Type: GrantFiled: October 24, 2007Date of Patent: March 10, 2009Assignee: Kabushiki Kaisha ToshibaInventors: Ren Sakata, Syuichi Sekine, Mutsumu Serizawa, Hiroki Shoki, Hiroshi Tsurumi, Shuichi Obayashi, Tomoko Adachi, Kiyoshi Toshimitsu, Tsuguhide Aoki
-
Publication number: 20090061802Abstract: An FM receiver includes a receiving unit that receives a signal from a broadcasting station and outputs a receiving signal, an equalizer that equalizes the receiving signal by using a calculated weight, and obtains an equalized output signal, a demodulator that demodulates the equalized output signal to reproduce the signal from the broadcasting station, a detection unit that observes size of the calculated weight to detect a capture state with respect to an undesired broadcasting station and generates a capture detection signal, and a weight setting unit that sets the calculated weight with respect to the equalizer at a steady state, and sets a specific weight for temporarily setting the equalizer in a through state when the capture detection signal is generated.Type: ApplicationFiled: September 2, 2008Publication date: March 5, 2009Inventors: Tsuguhide AOKI, Kiyonori TAKAHASHI, Yutaka MATSUMOTO
-
Patent number: 7489954Abstract: One of objects of a wireless communication apparatus according to the present invention is to realize stable communication regardless of received signal strength indication and information amount. The wireless communication apparatus for communicating in an autonomous distributed wireless network includes a detection unit which generates a detection signal by detecting a first wireless signal from a first wireless apparatus; a wireless circuit which receives a second wireless signal relating to said first wireless signal, transmitted from a second wireless apparatus which received said first wireless signal; a signal estimation unit which estimates said detection signal and the received second wireless signal; a signal selector which selects either said detection signal or the received second wireless signal, based on an estimation result of said signal estimation unit; and a demodulator which demodulates the signal selected by said signal selector.Type: GrantFiled: October 5, 2007Date of Patent: February 10, 2009Assignee: Kabushiki Kaisha ToshibaInventors: Syuichi Sekine, Mutsumu Serizawa, Hiroki Shoki, Hiroshi Tsurumi, Shuichi Obayashi, Kiyoshi Toshimitsu, Tomoko Adachi, Tsuguhide Aoki, Ren Sakata, Ryoko Matsuo
-
Publication number: 20090028271Abstract: A wireless device, method, and signal for use in communication of a wireless packet between transmitting device and a wireless receiving device via a plurality of antennas, wherein a signal generator generates wireless packet including a short-preamble sequence used for a first automatic gain control (AGC), a first long-preamble sequence, a signal field used for conveying a length of the wireless packet, an AGC preamble sequence used for a second AGC to be performed after the first AGC, a second long-preamble sequence, and a data field conveying data. The AGC preamble sequence is transmitted in parallel by the plurality of antennas.Type: ApplicationFiled: September 26, 2008Publication date: January 29, 2009Inventors: Tsuguhide Aoki, Daisuke Takeda, Takahiro Kobayashi, Yasuhiko Tanabe
-
Patent number: 7483503Abstract: A wireless communication apparatus includes a plurality of antennas, transmits a plurality of known symbol sequences each including a plurality of known symbols by using the antennas, each of the known symbols having subcarrier arrangement on which plural known information of the each of the known symbols are carried on, and inversion/non-inversion of a phase of known information on one of two adjacent subcarriers of the subcarrier arrangement being controlled in accordance with the number of the known symbols and time position of the each of the known symbols, and transmits data symbols by using the antennas after the known symbol sequences are transmitted.Type: GrantFiled: June 8, 2005Date of Patent: January 27, 2009Assignee: Kabushiki Kaisha ToshibaInventors: Yoshimasa Egashira, Daisuke Takeda, Tsuguhide Aoki, Yasuhiko Tanabe
-
Publication number: 20080279259Abstract: Radio communication apparatus for receiving OFDM signal from base station and transmitting FH signal to base station, using sub-channels, base station comparing hopping pattern information items indicating hopping patterns from radio communication apparatuses including radio communication apparatus, and generating collision information when hopping patterns include colliding hopping patterns, includes estimation unit configured to estimate channel response values of sub-channels based on OFDM signal, selector which selects, from sub-channels, several sub-channels which have higher channel response values than a value, each of channel response values being expressed by power level, signal-to-noise power ratio, or signal-to-interference ratio, determination unit configured to determine hopping pattern from selected sub-channels, transmitter which transmits, to base station, hopping pattern information item indicating determined hopping pattern, receiver which receives collision information from base station, anType: ApplicationFiled: June 10, 2008Publication date: November 13, 2008Inventors: Takahiro Kobayashi, Noritaka Deguchi, Yoshimasa Egashira, Yasuhiko Tanabe, Tsuguhide Aoki, Manabu Mukai, Tomoya Horiguchi
-
Patent number: 7450533Abstract: A wireless transmitting device includes a first and a second antennas, a first and a second transmitters connected to the first and the second antenna, respectively, signal provide unit provide a short preamble sequence, a first and a second signal fields to the first transmitter, and provide an AGC preamble sequence, a data and a long-preamble sequence to estimate a channel response to the first and the second transmitters, and a controller to power on the transmitters at different timings, respectively.Type: GrantFiled: May 19, 2005Date of Patent: November 11, 2008Assignee: Kabushiki Kaisha ToshibaInventors: Tsuguhide Aoki, Ichiro Seto, Kazumi Sato
-
Patent number: 7428280Abstract: The present invention has a N pieces of receiving antennas, a propagation path characterization estimator, a weight generator for interference canceller, an array processing interference canceller, a weight generator for signal estimator, a signal estimator, a transmission signal classification apparatus, and a decoding order decision apparatus. The antenna inference elimination circuit eliminates only signal component relating to transmission signal component which does not belong to groups. The signal estimator performs separation and decoding of the transmission signal belonging to the group. The transmission signal classification apparatus classifies the transmission signals from sets of the transmission antennas in which a cross-correlation value of the vector is larger than a threshold value, into one group, and classifies the transmission signal in which the cross-correlation value is smaller than the threshold value, into another group.Type: GrantFiled: June 21, 2007Date of Patent: September 23, 2008Assignee: Kabushiki Kaisha ToshibaInventors: Tsuguhide Aoki, Shuichi Obayashi
-
Publication number: 20080212704Abstract: In a wireless transmitting device which performs transmission by an OFDM using a plurality of subcarriers orthogonal to each other, a plurality of preambles to which a plurality of different subcarrier groups selected from a plurality of subcarriers within an OFDM signal band are allocated are transmitted by using a plurality of transmit antennas, and data is transmitted by using the antennas after the preambles are transmitted.Type: ApplicationFiled: April 1, 2008Publication date: September 4, 2008Inventors: Ichiro SETO, Tsuguhide Aoki, Hiroshi Yoshida
-
Publication number: 20080205540Abstract: Before data is transmitted from a plurality of antennas, a plurality of known symbol sequences are transmitted from these antennas. Each known symbol sequence contains a plurality of known symbols having different subcarrier arrangements. Known symbols transmitted from different antennas have different subcarrier arrangements.Type: ApplicationFiled: April 18, 2008Publication date: August 28, 2008Inventors: Daisuke TAKEDA, Yoshimasa EGASHIRA, Tsuguhide AOKI, Yasuhiko TANABE, Kohsuke HARADA, Hironori UCHIKAWA
-
Patent number: 7415074Abstract: In a wireless transmitting device which performs transmission by an OFDM using a plurality of subcarriers orthogonal to each other, a plurality of preambles to which a plurality of different subcarrier groups selected from a plurality of subcarriers within an OFDM signal band are allocated are transmitted by using a plurality of transmit antennas, and data is transmitted by using the antennas after the preambles are transmitted.Type: GrantFiled: December 21, 2004Date of Patent: August 19, 2008Assignee: Kabushiki Kaisha ToshibaInventors: Ichiro Seto, Tsuguhide Aoki, Hiroshi Yoshida
-
Patent number: 7386329Abstract: One of objects of a wireless communication apparatus according to the present invention is to realize stable communication regardless of received signal strength indication and information amount. The wireless communication apparatus for communicating in an autonomous distributed wireless network includes a detection unit which generates a detection signal by detecting a first wireless signal from a first wireless apparatus; a wireless circuit which receives a second wireless signal relating to said first wireless signal, transmitted from a second wireless apparatus which received said first wireless signal; a signal estimation unit which estimates said detection signal and the received second wireless signal; a signal selector which selects either said detection signal or the received second wireless signal, based on an estimation result of said signal estimation unit; and a demodulator which demodulates the signal selected by said signal selector.Type: GrantFiled: April 25, 2003Date of Patent: June 10, 2008Assignee: Kabushiki Kaisha ToshibaInventors: Syuichi Sekine, Mutsumu Serizawa, Hiroki Shoki, Hiroshi Tsurumi, Shuichi Obayashi, Kiyoshi Toshimitsu, Tomoko Adachi, Tsuguhide Aoki, Ren Sakata, Ryoko Matsuo
-
Publication number: 20080063120Abstract: A receiver of an OFDM signal includes a reception unit to receive an OFDM signal formed by a plurality of OFDM symbols respectively including data subcarriers to which data signals are allocated and pilot subcarriers to which cyclically shifted pilot signals are allocated in frequency domain, an estimator to estimate phase errors of the pilot signals to generate first estimated values related to an offset of the OFDM symbol corresponding to each two or more OFDM symbols in the OFDM signal, a weighting adder to perform weighting additions on the first estimated values to obtain one second estimated value related to the offset, a compensator to compensate the offset by using the second estimated value to obtain a compensated OFDM signal, and a decoder to decode the compensated OFDM signal to reproduce the data signals.Type: ApplicationFiled: March 21, 2007Publication date: March 13, 2008Inventors: Tsuguhide Aoki, Yoshimasa Egashira, Yasuhiko Tanabe
-
Publication number: 20080049665Abstract: A wireless communication system which transmits and receives a signal by using a plurality of wireless apparatuses, comprising: a first wireless apparatus group having a plurality of transmitting apparatuses, each transmitting a wireless signal based on a first control signal, said first wireless apparatus group forming a first ad-hoc network between said transmitting apparatuses; and a second wireless apparatus group having a plurality of destination apparatuses, each receiving the wireless signal transmitted from said first wireless apparatus group, said second wireless apparatus group transmitting and receiving the wireless signal received by said destination apparatuses based on a second control signal, and said second wireless apparatus group forming a second ad-hoc network between said destination apparatuses different from said first ad-hoc network.Type: ApplicationFiled: October 24, 2007Publication date: February 28, 2008Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Ren Sakata, Syuichi Sekine, Mutsumu Serizawa, Hiroki Shoki, Hiroshi Tsurumi, Shuichi Obayashi, Tomoko Adachi, Kiyoshi Toshimitsu, Tsuguhide Aoki
-
Publication number: 20080032757Abstract: One of objects of a wireless communication apparatus according to the present invention is to realize stable communication regardless of received signal strength indication and information amount. The wireless communication apparatus for communicating in an autonomous distributed wireless network includes a detection unit which generates a detection signal by detecting a first wireless signal from a first wireless apparatus; a wireless circuit which receives a second wireless signal relating to said first wireless signal, transmitted from a second wireless apparatus which received said first wireless signal; a signal estimation unit which estimates said detection signal and the received second wireless signal; a signal selector which selects either said detection signal or the received second wireless signal, based on an estimation result of said signal estimation unit; and a demodulator which demodulates the signal selected by said signal selector.Type: ApplicationFiled: October 5, 2007Publication date: February 7, 2008Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Syuichi SEKINE, Mutsumu Serizawa, Hiroki Shoki, Hiroshi Tsurumi, Shuichi Obayashi, Kiyoshi Toshimitsu, Tomoko Adachi, Tsuguhide Aoki, Ren Sakata, Ryoko Matsuo
-
Patent number: 7319714Abstract: A wireless communication system which transmits and receives a signal by using a plurality of wireless apparatuses, comprising: a first wireless apparatus group having a plurality of transmitting apparatuses, each transmitting a wireless signal based on a first control signal, said first wireless apparatus group forming a first ad-hoc network between said transmitting apparatuses; and a second wireless apparatus group having a plurality of destination apparatuses, each receiving the wireless signal transmitted from said first wireless apparatus group, said second wireless apparatus group transmitting and receiving the wireless signal received by said destination apparatuses based on a second control signal, and said second wireless apparatus group forming a second ad-hoc network between said destination apparatuses different from said first ad-hoc network.Type: GrantFiled: May 19, 2003Date of Patent: January 15, 2008Assignee: Kabushiki Kaisha ToshibaInventors: Ren Sakata, Syuichi Sekine, Mutsumu Serizawa, Hiroki Shoki, Hiroshi Tsurumi, Shuichi Obayashi, Tomoko Adachi, Kiyoshi Toshimitsu, Tsuguhide Aoki
-
Publication number: 20070297491Abstract: 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 {?0c1(n),?0c2(n)+?1c1(n), . . . ,?0cM?1(n)+?1cM?2(n), ?0cM(n)+?1cM?1(n)}.Type: ApplicationFiled: August 29, 2007Publication date: December 27, 2007Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Hideo Kasami, Hidehiro Matsuoka, Tsuguhide Aoki, Kazumi Sato
-
Patent number: 7305213Abstract: 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 {?0c1(n), ?0c2(n)+?1c1(n), . . . , ?0cM?1(n)+?1cM?2(n), ?0cM(n)+?1cM?1(n)}.Type: GrantFiled: March 29, 2004Date of Patent: December 4, 2007Assignee: Kabushiki Kaisha ToshibaInventors: Hideo Kasami, Hidehiro Matsuoka, Tsuguhide Aoki, Kazumi Sato
-
Publication number: 20070248200Abstract: The present invention has a N pieces of receiving antennas, a propagation path characterization estimator, a weight generator for interference canceller, an array processing interference canceller, a weight generator for signal estimator, a signal estimator, a transmission signal classification apparatus, and a decoding order decision apparatus. The antenna inference elimination circuit eliminates only signal component relating to transmission signal component which does not belong to groups. The signal estimator performs separation and decoding of the transmission signal belonging to the group. The transmission signal classification apparatus classifies the transmission signals from sets of the transmission antennas in which a cross-correlation value of the vector is larger than a threshold value, into one group, and classifies the transmission signal in which the cross-correlation value is smaller than the threshold value, into another group.Type: ApplicationFiled: June 21, 2007Publication date: October 25, 2007Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Tsuguhide Aoki, Shuichi Obayashi
-
Publication number: 20070232344Abstract: A wireless receiving device includes n (n is an integral number not less than 2) reception branches each capable of receiving a wireless packet containing a first signal, a second signal and a third signal in this order, the first signal including a single stream, the second signal indicating transmission of the third signal, and the third signal including a data section of a plurality of streams, a demodulation/decoding unit configured to demodulate and decode each of output signals of the reception branches, and a control unit configured to supply a power to m (m is an integral number of m<n) reception branches of the n reception branches during a receiving period of the first signal and to control power supplying to k (k is an integral number of m?k?n) reception branches after receiving the third signal.Type: ApplicationFiled: September 11, 2006Publication date: October 4, 2007Inventors: Tsuguhide Aoki, Kiyoshi Toshimitsu, Hiroshi Yoshida