Patents by Inventor Hiromichi Tomeba

Hiromichi Tomeba 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).

  • Publication number: 20150282144
    Abstract: Degradation in transmission performance due to a feedback error is lessened in a wireless communication system that performs non-linear pre-coding.
    Type: Application
    Filed: October 18, 2013
    Publication date: October 1, 2015
    Inventors: Hiromichi Tomeba, Takashi Onodera, Alvaro Ruiz Delgado, Minoru Kubota
  • Publication number: 20150270884
    Abstract: In a wireless communication system that performs non-linear pre-coding, degradation in transmission performance due to a feedback error is improved. The terminal device according to the present invention is a terminal device which receives radio signals that are space-multiplexed and on which non-linear pre-coding is performed, from a base station device including multiple antennas, the terminal device including: a channel state estimator 53 that estimates channel state information on a channel between the terminal device and the base station device; a terminal antenna module 51 that acquires a linear filter that is calculated in the base station device; and a channel equalization module 57 that performs channel equalization processing on the radio signals that are received at a first point in time, based on the channel state information at a second point in time that precedes the first point in time and on the linear filter.
    Type: Application
    Filed: October 1, 2013
    Publication date: September 24, 2015
    Applicant: Sharp Kabushiki Kaisha
    Inventors: Hiromichi Tomeba, Takashi Onodera, Alvaro Ruiz Delgado, Minoru Kubota
  • Patent number: 9130629
    Abstract: A terminal device notifies a base station device about control information associated with a receive quality of the terminal device. The base station device performs data modulation on a plurality of pieces of transmit data for the terminal device, by using a plurality of different data modulation schemes one by one, based on the control information, and spatially multiplexes the plurality of pieces of transmit data after the data modulation over a single wireless resource and transmits a spatially multiplexed signal. The terminal device receives the signal with the plurality of pieces of transmit data spatially multiplexed, and detects desirable transmit data from the receive signal, based on a first channel matrix which represents channel state information between the base station device and the terminal device and a second channel matrix in which the first channel matrix is multiplied by a transform matrix.
    Type: Grant
    Filed: March 2, 2012
    Date of Patent: September 8, 2015
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Hiromichi Tomeba, Takashi Onodera, Hiroshi Nakano, Alvaro Ruiz Delgado, Shimpei To
  • Patent number: 9106297
    Abstract: When spatial multiplexing is performed to any of a plurality of receiving antennas included in each terminal, it becomes possible to obtain excellent receiving characteristics by combining signals received by all antennas appropriately. A receiving antenna unit 28 receives channel state information from each terminal, a channel matrix H is obtained. A transmit weight/interference coefficient calculation unit 24 calculates a transmit weight and an interference coefficient based on channel matrix. The transmit weight is input to transmit weight multiplication units 17 and 23. The interference generation unit 15 generates an interference signal based on the interference coefficient. An interference subtraction unit 13 subtracts the interference signal from a desired signal. A modulo unit 14 adds a signal so that amplitude of an information signal output from the interference subtraction unit 13 falls within a constant range.
    Type: Grant
    Filed: May 27, 2011
    Date of Patent: August 11, 2015
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Shimpei To, Takashi Onodera, Kozue Hirata, Hiroshi Nakano, Hiromichi Tomeba
  • Patent number: 9077599
    Abstract: More reduction of the amount of operation than in QRM-VP is realized while maintaining transmission performance that can be achieved by VP.
    Type: Grant
    Filed: July 20, 2012
    Date of Patent: July 7, 2015
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Hiromichi Tomeba, Takashi Onodera, Hiroshi Nakano, Alvaro Ruiz Delgado
  • Publication number: 20150139106
    Abstract: MU-MIMO is implemented with little changes in the mechanism of the DCF. There is provided a wireless terminal station apparatus that is used in a wireless communication system formed of one wireless base station apparatus and a plurality of wireless terminal station apparatus, in which grouping is performed on the wireless terminal station apparatus in such a way that the wireless terminal station apparatus belongs to any one of a plurality of groups, and the wireless terminal station apparatus includes a backoff controlling portion that performs control such that a backoff value at the time of random backoff, the backoff value of the wireless terminal station apparatus belonging to at least one group, is selected from a set of candidates for a backoff value which is a set of values formed of predetermined limited numbers.
    Type: Application
    Filed: June 4, 2013
    Publication date: May 21, 2015
    Inventors: Yoko Masuda, Hideo Namba, Takashi Onodera, Hiromichi Tomeba, Minoru Kubota
  • Patent number: 9019919
    Abstract: When signals received by receiving antennas included in each terminal are subjected to MMSE combining, it is configured that each terminal is able to grasp position of desired signal in signal vector obtained after combining. A base station 100 receives by a receiving antenna 23 from the terminal apparatus channel state information between a transmitting antenna 16 and spatial multiplexing object antennas included in each terminal apparatus. A transmit weight calculation unit 19 calculates a transmit weight for performing spatial multiplexing transmission to the terminal apparatus based on the channel state information. Transmit weight multiplication unit s 12 and 18 multiplies an information signal addressed to each terminal apparatus to be performed spatial multiplexing by the transmit weight. A signal multiplexing unit 13 multiplexes the information signal multiplied by the transmit weight and an information to specify the information signal that needs to be demodulated by each terminal apparatus.
    Type: Grant
    Filed: May 27, 2011
    Date of Patent: April 28, 2015
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Shimpei To, Takashi Onodera, Kozue Hirata, Hiroshi Nakano, Hiromichi Tomeba, Minoru Kubota
  • Publication number: 20150103742
    Abstract: The present invention provides a technology that sets an offset value with respect to a received power of a reference signal from each of base station apparatuses, taking into consideration a difference between precoding schemes, in a wireless communication system that supports multiple different precoding schemes. The base station apparatus according to the present invention communicates with at least one of terminal apparatuses using the multiple different precoding schemes. The base station apparatus according to the present invention includes a transmission unit that transmits to the terminal apparatus multiple offset values that are to be added by the terminal apparatus to the received power of the reference signal from the base station apparatus, in which the multiple offset values correspond to the multiple precoding schemes, respectively.
    Type: Application
    Filed: May 15, 2013
    Publication date: April 16, 2015
    Applicant: Sharp Kabushiki Kaisha
    Inventors: Takashi Onodera, Hiromichi Tomeba, Minoru Kubota, Alvaro Ruiz Delgado
  • Patent number: 9008166
    Abstract: A filter calculating device includes a first equalization filter calculating section that generates at least a first conversion matrix and a first triangular matrix based on a channel state of a first channel; a first quasi-orthogonalization section that calculates a first unimodular matrix based on the first triangular matrix; and a second equalization filter calculating section that generates at least a second conversion matrix and a second triangular matrix based on a channel state of a second channel and the first unimodular matrix.
    Type: Grant
    Filed: April 2, 2012
    Date of Patent: April 14, 2015
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Hiroshi Nakano, Hiromichi Tomeba, Takashi Onodera, Alvaro Ruiz Delgado
  • Publication number: 20150098402
    Abstract: A wireless reception device of the invention is a wireless reception device that includes a terminal antenna unit 401 having a plurality of antennas and that receives wireless signals having undergone nonlinear precoding and spatial multiplexing from a wireless transmission device and includes a channel estimation unit 403 that is configured to estimate a channel state to and from the wireless transmission device and to output channel state information, based on first reference signals, and to estimate the channel state to and from the wireless transmission device and to output specific equivalent channel state information, based on second reference signals having undergone the nonlinear precoding, and a spatial demultiplexing processing unit 415 that is configured to demodulate desired signals from the received wireless signals, based on the specific equivalent channel state information.
    Type: Application
    Filed: May 10, 2013
    Publication date: April 9, 2015
    Applicant: Sharp Kabushiki Kaisha
    Inventors: Hiromichi Tomeba, Takashi Onodera, Alvaro Ruiz Delgado, Minoru Kubota
  • Patent number: 9001724
    Abstract: A multiplexed signal generator is configured to multiplex a signal addressed to a first reception device which has been subjected to a power suppression process of suppressing the power of the signal, and a signal addressed to a second reception device which is not subjected to the power suppression process.
    Type: Grant
    Filed: December 17, 2010
    Date of Patent: April 7, 2015
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Hiroshi Nakano, Takashi Onodera, Kozue Hirata, Hiromichi Tomeba, Shimpei To
  • Patent number: 8976881
    Abstract: A data signal component output from a reference signal demultiplexer and channel state information obtained by using DM-RS output from a channel estimating unit are input into a modulo estimating unit. In a channel compensator, a first provisional decision value sequence is calculated on the basis of the channel state information. The first provisional decision value sequence is input into a modulo calculator, and modulo calculations are performed on the first provisional decision value sequence to obtain a second provisional decision value sequence. A decision-feedback channel estimating section finds a first channel estimation value based on the first provisional decision value sequence and a second channel estimation value based on the second provisional decision value sequence. A modulo decision section decides whether or not a perturbation term has been added to a code, and uses a decision result for the selection of a demodulation method.
    Type: Grant
    Filed: July 19, 2012
    Date of Patent: March 10, 2015
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Hiromichi Tomeba, Takashi Onodera, Hiroshi Nakano, Alvaro Ruiz Delgado
  • Publication number: 20150029979
    Abstract: A radio receiving apparatus is notified of whether a multi-user multiplexing transmission signal that is transmitted from a radio transmitting apparatus is the multi-user MIMO or the OFDMA without increasing a control information amount. The radio transmitting apparatus includes a scheduling section 115 that selects any one group from a plural groups that represent combinations of the plural radio receiving apparatuses, and a transmit symbol generating section 125 that generates a transmit signal by multiplexing data to be transmitted to the plural radio receiving apparatuses belonging to the selected group by the multiplexing method in advance determined corresponding to an identification number added to the selected group.
    Type: Application
    Filed: March 11, 2013
    Publication date: January 29, 2015
    Applicant: Sharp Kabushiki Kaisha
    Inventors: Takashi Onodera, Hiromichi Tomeba, Alvaro Ruiz Delgado, Minoru Kubota
  • Publication number: 20150023279
    Abstract: A terminal device knows which kind of pre-coding has been applied without increasing overhead in a wireless communication system in which plural kinds of pre-coding are selectively or simultaneously used. A pre-coding device that is applied to a wireless communication device that performs wireless communication with a wireless receiving device applies, based on control information obtained from the wireless receiving device, the pre-coding to a data signal and plural kinds of specific reference signals, provides phase rotation to the plural kinds of specific reference signals, and associates phase rotation amounts of the phase rotation with information that is notified to the wireless receiving device.
    Type: Application
    Filed: March 4, 2013
    Publication date: January 22, 2015
    Applicant: Sharp Kabushiki Kaisha
    Inventors: Hiromichi Tomeba, Takashi Onodera, Alvaro Ruiz Delgado, Minoru Kubota
  • Patent number: 8897122
    Abstract: Disclosed is a transmission device including a plurality of antennas for transmitting signals in the same channel at the same time point to a plurality of reception devices, characterized by including: a DRS generator configured to generate DRSs (dedicated reference signals) for the respective reception devices; a nonlinear spatial multiplexer configured to generate a nonorthogonal DRS by use of a first group of DRSs including at least one of the DRSs; and a transmitter configured to transmit a signal containing at least the nonorthogonal DRS.
    Type: Grant
    Filed: January 31, 2011
    Date of Patent: November 25, 2014
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Hiroshi Nakano, Takashi Onodera, Shimpei To, Kozue Hirata, Hiromichi Tomeba
  • Publication number: 20140204841
    Abstract: A wireless reception device is notified of whether a multi-user MIMO signal transmitted from a wireless transmission device has undergone linear precoding or non-linear precoding without increasing the amount of control information. A wireless transmission device having a plurality of transmit antennas 303, for transmitting spatially multiplexed signals to a plurality of wireless reception devices includes a group construction unit 307 configured to classify the wireless reception devices into a plurality of groups and to determine a precoding scheme for each of the groups, a selection unit 315 configured to select one group from among the groups, and a precoding unit 323 configured to precode transmit data addressed to each of wireless reception devices belonging to the selected group, using a precoding scheme determined for the selected group.
    Type: Application
    Filed: August 13, 2012
    Publication date: July 24, 2014
    Applicant: SHARP KABUSHIKI KAISHA
    Inventors: Alvaro Ruiz Delgado, Takashi Onodera, Hiromichi Tomeba, Hiroshi Nakano, Minoru Kubota
  • Publication number: 20140177763
    Abstract: A data signal component output from a reference signal demultiplexer and channel state information obtained by using DM-RS output from a channel estimating unit are input into a modulo estimating unit. In a channel compensator, a first provisional decision value sequence is calculated on the basis of the channel state information. The first provisional decision value sequence is input into a modulo calculator, and modulo calculations are performed on the first provisional decision value sequence to obtain a second provisional decision value sequence. A decision-feedback channel estimating section finds a first channel estimation value based on the first provisional decision value sequence and a second channel estimation value based on the second provisional decision value sequence. A modulo decision section decides whether or not a perturbation term has been added to a code, and uses a decision result for the selection of a demodulation method.
    Type: Application
    Filed: July 19, 2012
    Publication date: June 26, 2014
    Applicant: SHARP KABUSHIKI KAISHA
    Inventors: Hiromichi Tomeba, Takashi Onodera, Hiroshi Nakano, Alvaro Ruiz Delgado
  • Publication number: 20140177747
    Abstract: The current feedback mechanisms in the 802.11 standard are not appropriate for MU-MIMO, in which many STAs transmit their feedback to an AP, which then proceeds to select the most appropriate STAs for transmission and discards the feedback of the rest of the STAs. This operation leads to large overhead, effectively limiting the effectivity of the MU-MIMO operation. The techniques described in this document allow for a more efficient transmission of feedback related to a MIMO communication. In this invention a double step feedback method is proposed trough which the STAs first transmit a reduced feedback enabling the AP to perform scheduling, and then the STAs that are chosen for scheduling transmit complementary feedback for the only the streams that are chosen by the scheduling operation. This operation results in a much more efficient feedback transmission.
    Type: Application
    Filed: December 19, 2013
    Publication date: June 26, 2014
    Applicant: Sharp Kabushiki Kaisha
    Inventors: Alvaro RUIZ DELGADO, Minoru KUBOTA, Takashi ONODERA, Hiromichi TOMEBA
  • Publication number: 20140177751
    Abstract: More reduction of the amount of operation than in QRM-VP is realized while maintaining transmission performance that can be achieved by VP.
    Type: Application
    Filed: July 20, 2012
    Publication date: June 26, 2014
    Applicant: SHARP KABUSHIKI KAISHA
    Inventors: Hiromichi Tomeba, Takashi Onodera, Hiroshi Nakano, Alvaro Ruiz Delgado
  • Publication number: 20140146904
    Abstract: The present invention switches an interference suppression system between a linear precoding and a nonlinear precoding in accordance with a communication environment. A wireless transmission apparatus is provided with a plurality of transmission antenna units (303), and multiplexes spatially and transmits a plurality of series of data with respect to at least one wireless reception apparatus, and includes a selection unit (307) configured to select any one precoding system from a plurality of types of precoding systems and a precoding unit (315) configured to carry out precoding with respect to the plurality of series of data using the selected precoding system. In addition, the selection unit selects either of a first precoding system carrying out linear processing with respect to the plurality of series of data or a second precoding system carrying out nonlinear processing with respect to the plurality of series of data.
    Type: Application
    Filed: October 24, 2011
    Publication date: May 29, 2014
    Applicant: SHARP KABUSHIKI KAISHA
    Inventors: Takashi Onodera, Hiromichi Tomeba, Shimpei To, Hiroshi Nakano, Alvaro Ruiz Delgado, Minoru Kubota