Patents by Inventor Shinsuke Ibi
Shinsuke Ibi 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: 11777585Abstract: A wireless receiving apparatus generates an N?×B? weight matrix W whose columns are orthogonal to each other by decomposing an estimated N?×M? channel matrix into the N?×B? weight matrix W and a B?×M? matrix containing two or more non-zero matrix elements in each column, where B? is an integer less than or equal to N?-1 and greater than or equal to M?. Alternatively, the wireless receiving apparatus generates a combination of an N?×B? sub-weight matrix W1 and at least one second sub-weight matrix, where the product of the sub-weight matrix W1 with the at least one second sub-weight matrix is equal to the weight matrix W. The wireless receiving apparatus performs receive beamforming on received signals of N? receiving antennas using the weight matrix W or the sub-weight matrix W1. The wireless receiving apparatus then performs a BP algorithm using receive-beamformed signals.Type: GrantFiled: August 30, 2022Date of Patent: October 3, 2023Assignees: NEC CORPORATION, OSAKA UNIVERSITY, THE DOSHISHAInventors: Takanobu Doi, Kazushi Muraoka, Naoto Ishii, Takumi Takahashi, Shinsuke Ibi
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Patent number: 11695455Abstract: A relay device relaying, to a reception device, a signal stream transmitted by a transmission device through MIMO transmission, the relay device including a lattice base reduction processing unit transforming bases of the signal stream transmitted by the transmission device through MIMO transmission, to increase orthogonality of a lattice of the signal stream, a MIMO equalization unit detecting, by equalization, reception symbols in the signal stream with the bases transformed by the lattice base reduction processing unit, a symbol quantization unit performing quantization by mapping the reception symbols detected by the MIMO equalization unit, to a region on a complex plane delimited by quantization threshold values, and a transmission unit transmitting, to the reception device, at least a signal quantized by the symbol quantization unit.Type: GrantFiled: July 15, 2020Date of Patent: July 4, 2023Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Naotaka Shibata, Jun Terada, Shinsuke Ibi, Seiichi Sanpei
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Patent number: 11627485Abstract: A computer system includes at least one memory and at least one processor coupled to the at least one memory and configured to execute one or more sets of instructions. The one or more sets of instructions, when executed by the at least one processor, cause the computer system to provide virtualized radio access network functions including executing a BP algorithm and provide controller functions including adjusting the total number of iterations of the BP algorithm depending on available computing resources of the computer system.Type: GrantFiled: April 14, 2021Date of Patent: April 11, 2023Assignees: NEC CORPORATION, OSAKA UNIVERSITY, THE DOSHISHAInventors: Kazushi Muraoka, Naoto Ishii, Takumi Takahashi, Shinsuke Ibi
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Publication number: 20230075680Abstract: A wireless receiving apparatus generates an N?×B? weight matrix W whose columns are orthogonal to each other by decomposing an estimated N?×M? channel matrix into the N?×B? weight matrix W and a B?×M? matrix containing two or more non-zero matrix elements in each column, where B? is an integer less than or equal to N?-1 and greater than or equal to M?. Alternatively, the wireless receiving apparatus generates a combination of an N?×B? sub-weight matrix W1 and at least one second sub-weight matrix, where the product of the sub-weight matrix W1 with the at least one second sub-weight matrix is equal to the weight matrix W. The wireless receiving apparatus performs receive beamforming on received signals of N? receiving antennas using the weight matrix W or the sub-weight matrix W1. The wireless receiving apparatus then performs a BP algorithm using receive-beamformed signals.Type: ApplicationFiled: August 30, 2022Publication date: March 9, 2023Applicants: NEC CORPORATION, OSAKA UNIVERSITY, THE DOSHISHAInventors: Takanobu DOI, Kazushi MURAOKA, Naoto ISHII, Takumi TAKAHASHI, Shinsuke IBI
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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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Publication number: 20220294498Abstract: A relay device relaying, to a reception device, a signal stream transmitted by a transmission device through MIMO transmission, the relay device including a lattice base reduction processing unit transforming bases of the signal stream transmitted by the transmission device through MIMO transmission, to increase orthogonality of a lattice of the signal stream, a MIMO equalization unit detecting, by equalization, reception symbols in the signal stream with the bases transformed by the lattice base reduction processing unit, a symbol quantization unit performing quantization by mapping the reception symbols detected by the MIMO equalization unit, to a region on a complex plane delimited by quantization threshold values, and a transmission unit transmitting, to the reception device, at least a signal quantized by the symbol quantization unit.Type: ApplicationFiled: July 15, 2020Publication date: September 15, 2022Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Naotaka SHIBATA, Jun TERADA, Shinsuke IBI, Seiichi SANPEI
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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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Publication number: 20210321284Abstract: A computer system includes at least one memory and at least one processor coupled to the at least one memory and configured to execute one or more sets of instructions. The one or more sets of instructions, when executed by the at least one processor, cause the computer system to provide virtualized radio access network functions including executing a BP algorithm and provide controller functions including adjusting the total number of iterations of the BP algorithm depending on available computing resources of the computer system.Type: ApplicationFiled: April 14, 2021Publication date: October 14, 2021Applicants: NEC CORPORATION, OSAKA UNIVERSITY, THE DOSHISHAInventors: Kazushi Muraoka, Naoto Ishii, Takumi Takahashi, Shinsuke Ibi
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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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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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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: 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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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: 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: 20160021663Abstract: According to one aspect of the present invention, there is provided a wireless communication device that transmits a first wireless signal representing a bit sequence to a reception device, in which the first wireless signal is transmitted concurrently with a second wireless signal representing the bit sequence described above, and in which between the first wireless signal and the second wireless signal, components with a prescribed ratio are mapped to a different frequency or to a different time between the first wireless signal and the second wireless signal and remaining components are mapped to the same frequency and to the same time between the first wireless signal and the second wireless signal.Type: ApplicationFiled: March 4, 2014Publication date: January 21, 2016Applicants: OSAKA UNIVERSITY, SHARP KABUSHIKI KAISHAInventors: Hiroki TAKAHASHI, Jungo GOTO, Osamu NAKAMURA, Kazunari YOKOMAKURA, Yasuhiro HAMAGUCHI, Seiichi SAMPEI, Shinichi MIYAMOTO, Shinsuke IBI
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Publication number: 20160013952Abstract: A reception unit for receiving a signal representing a bit sequence, a channel estimation unit for estimating channel variation that the received signal undergoes and calculating a channel estimation value representing the channel variation, and a demodulation unit for demodulating the signal by using the channel estimation value and restoring each bit included in the bit sequence represented by the received signal are included, and the demodulation unit performs demodulation of the received signal by using a value indicating magnitude of error included in the channel estimation value.Type: ApplicationFiled: February 19, 2014Publication date: January 14, 2016Applicants: OSAKA UNIVERSITY, SHARP KABUSHIKI KAISHAInventors: Osamu NAKAMURA, Hiroki TAKAHASHI, Jungo GOTO, Kazunari YOKOMAKURA, Yasuhiro HAMAGUCHI, Shinsuke IBI, Seiichi SAMPEI, Shinichi MIYAMOTO