Patents by Inventor Seiichi Sampei
Seiichi Sampei 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: 11595153Abstract: A method implemented in a computer system includes training a network, which is obtained by unfolding an iterative algorithm for demodulation or demodulation and decoding, using a machine learning technique with a loss function that takes into account non-Gaussianity of a log-likelihood ratio (LLR) distribution calculated from an output of the network. The method further includes producing a first set of learned parameters of that iterative algorithm.Type: GrantFiled: February 16, 2022Date of Patent: February 28, 2023Assignees: NEC CORPORATION, OSAKA UNIVERSITY, THE DOSHISHAInventors: Kazushi Muraoka, Takanobu Doi, Naoto Ishii, Takumi Takahashi, Seiichi Sampei, Shinsuke Ibi
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Publication number: 20220337341Abstract: A method implemented in a computer system includes training a network, which is obtained by unfolding an iterative algorithm for demodulation or demodulation and decoding, using a machine learning technique with a loss function that takes into account non-Gaussianity of a log-likelihood ratio (LLR) distribution calculated from an output of the network. The method further includes producing a first set of learned parameters of that iterative algorithm.Type: ApplicationFiled: February 16, 2022Publication date: October 20, 2022Applicants: NEC CORPORATION, OSAKA UNIVERSITY, THE DOSHISHAInventors: Kazushi MURAOKA, Takanobu Doi, Naoto Ishii, Takumi Takahashi, Seiichi Sampei, Shinsuke Ibi
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Patent number: 11309991Abstract: A BP detector of a wireless receiver apparatus reads a first parameter set or a second parameter set. The first parameter set includes a plurality of scaling factors and a plurality of damping factors learned together using a deep learning technique. The second parameter set includes a plurality of scaling factors and a plurality of node selection factors learned together using a deep learning technique from a memory. The BP detector executes an iterative BP algorithm that uses the first parameter set or the second parameter set in order to perform multi-user detection.Type: GrantFiled: April 14, 2021Date of Patent: April 19, 2022Assignees: NEC CORPORATION, OSAKA UNIVERSITY, THE DOSHISHAInventors: Kazushi Muraoka, Naoto Ishii, Takumi Takahashi, Seiichi Sampei, Shinsuke Ibi
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Patent number: 11283659Abstract: An apparatus generating a packet of signals, a number of preamble signals of a preamble portion for each of a number of radio transmission units, and a number of data signals of a data portion, wherein a phase rotation in frequency domain is equal to a time shift in time domain is applied to each symbol of the number of preamble signals separately, the same phase rotation is applied to each symbol separately, the amount of the phase rotation is different for each preamble signal and each data signal, the amount of the phase rotation of one of the number of data signals and one of the number of preamble signals is both zero, and the amount of the phase rotation is equal between one of the preamble signals and one of the data signals for the same radio transmission unit.Type: GrantFiled: October 28, 2020Date of Patent: March 22, 2022Assignee: Sharp Kabushiki KaishaInventors: Shimpei To, Yasuhiro Hamaguchi, Hideo Nanba, Seiichi Sampei, Hiroshi Harada, Masafumi Moriyama
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Publication number: 20210320750Abstract: A BP detector of a wireless receiver apparatus reads a first parameter set or a second parameter set. The first parameter set includes a plurality of scaling factors and a plurality of damping factors learned together using a deep learning technique. The second parameter set includes a plurality of scaling factors and a plurality of node selection factors learned together using a deep learning technique from a memory. The BP detector executes an iterative BP algorithm that uses the first parameter set or the second parameter set in order to perform multi-user detection.Type: ApplicationFiled: April 14, 2021Publication date: October 14, 2021Applicants: NEC CORPORATION, OSAKA UNIVERSITY, THE DOSHISHAInventors: Kazushi MURAOKA, Naoto ISHII, Takumi TAKAHASHI, Seiichi SAMPEI, Shinsuke IBI
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Publication number: 20210044466Abstract: An apparatus generating a packet of signals, a number of preamble signals of a preamble portion for each of a number of radio transmission units, and a number of data signals of a data portion, wherein a phase rotation in frequency domain is equal to a time shift in time domain is applied to each symbol of the number of preamble signals separately, the same phase rotation is applied to each symbol separately, the amount of the phase rotation is different for each preamble signal and each data signal, the amount of the phase rotation of one of the number of data signals and one of the number of preamble signals is both zero, and the amount of the phase rotation is equal between one of the preamble signals and one of the data signals for the same radio transmission unit.Type: ApplicationFiled: October 28, 2020Publication date: February 11, 2021Applicant: SHARP KABUSHIKI KAISHAInventors: Shimpei TO, Yasuhiro HAMAGUCHI, Hideo NANBA, Seiichi SAMPEI, Hiroshi HARADA, Masafumi MORIYAMA
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Patent number: 10833903Abstract: An apparatus generating a packet of signals, a number of preamble signals of a preamble portion for each of a number of radio transmission units, and a number of data signals of a data portion, wherein a phase rotation in frequency domain is equal to a time shift in time domain is applied to each symbol of the number of preamble signals separately, the same phase rotation is applied to each symbol separately, the amount of the phase rotation is different for each preamble signal and each data signal, the amount of the phase rotation of one of the number of data signals and one of the number of preamble signals is both zero, and the amount of the phase rotation is equal between one of the preamble signals and one of the data signals for the same radio transmission unit.Type: GrantFiled: June 22, 2016Date of Patent: November 10, 2020Assignee: SHARP KABUSHIKI KAISHAInventors: Shimpei To, Yasuhiro Hamaguchi, Hideo Nanba, Seiichi Sampei, Hiroshi Harada, Masafumi Moriyama
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Patent number: 10660126Abstract: Provided is a communication device, even in a case that many communication devices are connected in a radio communication network constituted of a plurality of different radio communication technologies, that suppresses data transmission of one communication technology from delaying due to data transmission situation of another communication device and enables coexistence of different radio communication technologies.Type: GrantFiled: January 31, 2017Date of Patent: May 19, 2020Assignees: SHARP KABUSHIKI KAISHA, OSAKA UNIVERSITYInventors: Takashi Yoshimoto, Jungo Goto, Osamu Nakamura, Yasuhiro Hamaguchi, Seiichi Sampei, Shinsuke Ibi
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Publication number: 20200052823Abstract: A terminal apparatus for performing radio communication with another terminal apparatus via a base station apparatus, the terminal apparatus including: a transmitter configured to transmit, to the base station apparatus, a signal of data addressed to the other terminal apparatus; a receiver configured to receive a signal from the base station apparatus to the other terminal apparatus; and a controller configured to determine whether the base station apparatus has successfully received the signal of the data transmitted from the transmitter to the other terminal apparatus, by using the signal from the base station apparatus to the other terminal apparatus received by the receiver.Type: ApplicationFiled: March 28, 2018Publication date: February 13, 2020Inventors: JUNGO GOTO, OSAMU NAKAMURA, SEIICHI SAMPEI, SHINSUKE IBI
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Patent number: 10477548Abstract: A communication device comprising at least a receiver and a demodulator. The receiver receives first receiving signals and second receiving signals, wherein the first receiving signals are allocated to a first set of subcarriers composed of two or more continuous subcarriers, the second receiving signals are allocated to a second set of subcarriers composed of two or more continuous subcarriers, and at least a portion of the second set of subcarriers overlaps a portion of the first set of subcarriers in a time frame. The demodulator configured to detect the second receiving signals transmitted using one or more subcarriers from receiving signals including the first receiving signals and the second receiving signals, wherein the one or more subcarriers are subcarriers such that the first set of subcarriers overlap the second set of subcarriers, and the demodulator being demodulates the first receiving signals.Type: GrantFiled: April 4, 2017Date of Patent: November 12, 2019Assignee: SHARP KABUSHIKI KAISHAInventors: Kazunari Yokomakura, Yasuhiro Hamaguchi, Shimpei To, Minoru Kubota, Hideo Namba, Seiichi Sampei, Shinichi Miyamoto, Shinsuke Ibi
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Publication number: 20190045540Abstract: Provided is a communication device, even in a case that many communication devices are connected in a radio communication network constituted of a plurality of different radio communication technologies, that suppresses data transmission of one communication technology from delaying due to data transmission situation of another communication device and enables coexistence of different radio communication technologies.Type: ApplicationFiled: January 31, 2017Publication date: February 7, 2019Inventors: TAKASHI YOSHIMOTO, JUNGO GOTO, OSAMU NAKAMURA, YASUHIRO HAMAGUCHI, SEIICHI SAMPEI, SHINSUKE IBI
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Publication number: 20180343688Abstract: In a wireless communication system that includes a first access point and a guard terminal, the guard terminal transmits a signal for a reservation of a transmission medium after receiving a reservation medium signal transmitted from the first access point and the guard terminal transmits a signal for a reservation of the transmission medium after receiving a reservation medium signal transmitted from a second access point that is different from the first access point.Type: ApplicationFiled: February 23, 2016Publication date: November 29, 2018Inventors: Osamu NAKAMURA, Jungo GOTO, Yasuhiro HAMAGUCHI, Shinichi MIYAMOTO, Seiichi SAMPEI, Shinsuke IBI
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Patent number: 9788336Abstract: A microwave base station estimates a first position of a terminal station that has transmitted millimeter-wave signal quality information and a second position of a terminal station that has transmitted a data bandwidth reservation request and transmits the millimeter-wave signal quality information and the first position or the data bandwidth reservation request and the second position to a control station, and the control station stores the millimeter-wave signal quality information and the first position in a database in association with each other and determines, for the terminal station that has transmitted the data bandwidth reservation request, a millimeter-wave base station with which communication is to be performed, a first directivity, and a second directivity by referring to the database by using the second position, and allocates a radio resource based on the determined millimeter-wave base station, first directivity, and second directivity.Type: GrantFiled: August 7, 2015Date of Patent: October 10, 2017Assignee: Panasonic CorporationInventors: Kei Sakaguchi, Ehab Mahmoud Mohamed Mahmoud, Shinichi Miyamoto, Seiichi Sampei, Naganori Shirakata
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Publication number: 20170245277Abstract: A communication device comprising at least a receiver and a demodulator. The receiver receives first receiving signals and second receiving signals, wherein the first receiving signals are allocated to a first set of subcarriers composed of two or more continuous subcarriers, the second receiving signals are allocated to a second set of subcarriers composed of two or more continuous subcarriers, and at least a portion of the second set of subcarriers overlaps a portion of the first set of subcarriers in a time frame. The demodulator configured to detect the second receiving signals transmitted using one or more subcarriers from receiving signals including the first receiving signals and the second receiving signals, wherein the one or more subcarriers are subcarriers such that the first set of subcarriers overlap the second set of subcarriers, and the demodulator being demodulates the first receiving signals.Type: ApplicationFiled: April 4, 2017Publication date: August 24, 2017Applicant: SHARP KABUSHIKI KAISHAInventors: Kazunari YOKOMAKURA, Yasuhiro HAMAGUCHI, Shimpei TO, Minoru KUBOTA, Hideo NAMBA, Seiichi SAMPEI, Shinichi MIYAMOTO, Shinsuke IBI
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Patent number: 9680602Abstract: A bit coding device that creates a coded bit sequence by performing error correction coding on an input bit sequence that is input, includes a coding unit that creates a first bit sequence by performing the error correction coding on the input bit sequence, an extraction unit that extracts a second bit sequence from the first bit sequence, and an information compression unit that creates a third bit sequence by performing lossy compression on the second bit sequence, in which coded bits include at least a portion of the third bit sequence.Type: GrantFiled: August 13, 2013Date of Patent: June 13, 2017Assignees: SHARP KABUSHIKI KAISHA, OSAKA UNIVERSITYInventors: Jungo Goto, Hiroki Takahashi, Osamu Nakamura, Kazunari Yokomakura, Yasuhiro Hamaguchi, Shinsuke Ibi, Seiichi Sampei, Shinichi Miyamoto
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Patent number: 9629154Abstract: A communication device comprising at least a receiver and a demodulator. The receiver receives first receiving signals and second receiving signals, wherein the first receiving signals are allocated to a first set of subcarriers composed of two or more continuous subcarriers, the second receiving signals are allocated to a second set of subcarriers composed of two or more continuous subcarriers, and at least a portion of the second set of subcarriers overlaps a portion of the first set of subcarriers in a time frame. The demodulator configured to detect the second receiving signals transmitted using one or more subcarriers from receiving signals including the first receiving signals and the second receiving signals, wherein the one or more subcarriers are subcarriers such that the first set of subcarriers overlap the second set of subcarriers, and the demodulator being demodulates the first receiving signals.Type: GrantFiled: February 16, 2016Date of Patent: April 18, 2017Assignee: SHARP KABUSHIKI KAISHAInventors: Kazunari Yokomakura, Yasuhiro Hamaguchi, Shimpei To, Minoru Kubota, Hideo Namba, Seiichi Sampei, Shinichi Miyamoto, Shinsuke Ibi
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Publication number: 20160301553Abstract: An apparatus generating a packet of signals, a number of preamble signals of a preamble portion for each of a number of radio transmission units, and a number of data signals of a data portion, wherein a phase rotation in frequency domain is equal to a time shift in time domain is applied to each symbol of the number of preamble signals separately, the same phase rotation is applied to each symbol separately, the amount of the phase rotation is different for each preamble signal and each data signal, the amount of the phase rotation of one of the number of data signals and one of the number of preamble signals is both zero, and the amount of the phase rotation is equal between one of the preamble signals and one of the data signals for the same radio transmission unit.Type: ApplicationFiled: June 22, 2016Publication date: October 13, 2016Applicant: SHARP KABUSHIKI KAISHAInventors: Shimpei TO, Yasuhiro HAMAGUCHI, Hideo NANBA, Seiichi SAMPEI, Hiroshi HARADA, Masafumi MORIYAMA
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Publication number: 20160165603Abstract: A communication device comprising at least a receiver and a demodulator. The receiver receives first receiving signals and second receiving signals, wherein the first receiving signals are allocated to a first set of subcarriers composed of two or more continuous subcarriers, the second receiving signals are allocated to a second set of subcarriers composed of two or more continuous subcarriers, and at least a portion of the second set of subcarriers overlaps a portion of the first set of subcarriers in a time frame. The demodulator configured to detect the second receiving signals transmitted using one or more subcarriers from receiving signals including the first receiving signals and the second receiving signals, wherein the one or more subcarriers are subcarriers such that the first set of subcarriers overlap the second set of subcarriers, and the demodulator being demodulates the first receiving signals.Type: ApplicationFiled: February 16, 2016Publication date: June 9, 2016Applicant: SHARP KABUSHIKI KAISHAInventors: Kazunari YOKOMAKURA, Yasuhiro HAMAGUCHI, Shimpei TO, Minoru KUBOTA, Hideo NAMBA, Seiichi SAMPEI, Shinichi MIYAMOTO, Shinsuke IBI
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Patent number: 9301298Abstract: A communication device comprising a transmission unit and a reception unit. The transmission unit is configured to transmit, to a first communication device, first information indicating a first set of subcarriers comprising of a plurality of subcarriers, and to a second communication device, second information indicating a second set of subcarriers comprising of a plurality of subcarriers. The reception unit is configured to receive a first Discrete Fourier Transform-spread-OFDM (DFT-S-OFDM) signal from the first communication device using the first information and a second Discrete Fourier Transform-spread-OFDM (DFT-S-OFDM) signal from the second communication device using the second information. Also, in the communication device, a portion of the second set of subcarriers can overlap with at least a portion of the first set of subcarriers in a time frame of a plurality of time frames.Type: GrantFiled: March 6, 2014Date of Patent: March 29, 2016Assignee: SHARP KABUSHIKI KAISHAInventors: Kazunari Yokomakura, Yasuhiro Hamaguchi, Shimpei To, Minoru Kubota, Hideo Namba, Seiichi Sampei, Shinichi Miyamoto, Shinsuke Ibi
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Publication number: 20160056904Abstract: A microwave base station estimates a first position of a terminal station that has transmitted millimeter-wave signal quality information and a second position of a terminal station that has transmitted a data bandwidth reservation request and transmits the millimeter-wave signal quality information and the first position or the data bandwidth reservation request and the second position to a control station, and the control station stores the millimeter-wave signal quality information and the first position in a database in association with each other and determines, for the terminal station that has transmitted the data bandwidth reservation request, a millimeter-wave base station with which communication is to be performed, a first directivity, and a second directivity by referring to the database by using the second position, and allocates a radio resource based on the determined millimeter-wave base station, first directivity, and second directivity.Type: ApplicationFiled: August 7, 2015Publication date: February 25, 2016Inventors: KEI SAKAGUCHI, EHAB MAHMOUD MOHAMED MAHMOUD, SHINICHI MIYAMOTO, SEIICHI SAMPEI, NAGANORI SHIRAKATA