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公开(公告)号：US11689315B2
公开(公告)日：2023-06-27
申请号：US17463811
申请日：2021-09-01
Inventor： Yutaka Murakami , Tomohiro Kimura , Mikihiro Ouchi
IPC: H03M13/00 , H04L1/00 , H04L27/34 , H03M13/25 , H04L1/06 , H03M13/11 , H04B7/06 , H04B7/0413 , H04L27/18
CPC classification number: H04L1/0041 , H03M13/255 , H04L1/0045 , H04L1/0057 , H04L1/0071 , H04L1/0643 , H04L27/34 , H03M13/1102 , H03M13/1165 , H04B7/0413 , H04B7/0669 , H04L27/18 , H04L2001/0093
Abstract: In a transmission method according to one aspect of the present disclosure, a encoder performs error correction coding on an information bit string to generate a code word. A mapper modulates a first bit string in which the number of bits is the predetermined integral multiple of (X+Y) in the code word using a first scheme, the first scheme being a set of a modulation scheme in which an X-bit bit string is mapped to generate a first complex signal and a modulation scheme in which a Y-bit bit string is mapped to generate a second complex signal, and modulates a second bit string in which the first bit string is removed from the code word using a second scheme different from the first scheme.
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公开(公告)号：US11611415B2
公开(公告)日：2023-03-21
申请号：US17673054
申请日：2022-02-16
Inventor： Yutaka Murakami , Tomohiro Kimura , Mikihiro Ouchi , Hiroyuki Motozuka
IPC: H04L5/00 , H04B17/318 , H04B7/0408 , H04B7/0456 , H04L27/04 , H04L27/26
Abstract: A transmission device that improves data reception quality includes: a weighting synthesizer that generates a first precoded signal and a second precoded signal from a first baseband signal and a second baseband signal, respectively; a phase changer that applies a phase change of i×Δλ to the second precoded signal; an inserter that inserts a pilot signal into the second precoded signal applied with the phase change; and a phase changer that applies a phase change to the second precoded signal applied with the phase change and inserted with the pilot signal. Δλ satisfies π/2 radians
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公开(公告)号：US11606159B2
公开(公告)日：2023-03-14
申请号：US16665597
申请日：2019-10-28
Inventor： Yutaka Murakami , Nobuhiko Hashida
IPC: H04J14/02 , H04B10/2575
Abstract: A transmission device includes a symbol generator that generates a modulation symbol by mapping transmission data to a signal point arranged in a two-dimensional or three-dimensional color space; and an outputter that outputs an optical signal modulated according to the modulation symbol.
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公开(公告)号：US11601168B2
公开(公告)日：2023-03-07
申请号：US17500190
申请日：2021-10-13
Inventor： Yutaka Murakami , Tomohiro Kimura , Mikihiro Ouchi , Hiroyuki Motozuka
IPC: H04B7/0456 , H04B7/0413 , H04B7/06 , H04B7/0417
Abstract: A transmission device includes: a weighting synthesizer that generates a first precoded signal and a second preceded signal; a first pilot inserter that inserts a pilot signal into the first precoded signal; a phase changer that applies a phase change of i×Δλ to the second precoded signal, where i is a symbol number and an integer that is greater than or equal to 0; an inserter that inserts a pilot signal into the phase-changed second precoded signal; and a phase changer that applies a phase change to the phase-changed and pilot-signal-inserted second precoded signal. Δλ satisfies π/2 radians
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公开(公告)号：US11575553B2
公开(公告)日：2023-02-07
申请号：US17500511
申请日：2021-10-13
Inventor： Yutaka Murakami , Tomohiro Kimura , Mikihiro Ouchi
Abstract: A transmission method includes mapping processing, phase change processing, and transmission processing. In the mapping processing, a plurality of first modulation signals and a plurality of second modulation signals are generated using a first mapping scheme, and a plurality of third modulation signals and a plurality of fourth modulation signals are generated using a second mapping scheme. In the phase change processing, a phase change is performed on the plurality of second modulation signals and the plurality of fourth modulation signals using all N kinds of phases. In the transmission processing, the first modulation signals and the second modulation signals are respectively transmitted at a same frequency and a same time from different antennas, and the third modulation signals and the fourth modulation signals are respectively transmitted at a same frequency and a same time from the different antennas.
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Patent Agency Ranking
公开(公告)号：US11515922B2
公开(公告)日：2022-11-29
申请号：US17394947
申请日：2021-08-05
Inventor： Yutaka Murakami , Tomohiro Kimura , Mikihiro Ouchi
Abstract: An indicator in a master AP from among a plurality of APs obtains communication quality of communication with an AP which is a communication partner. In the case where the obtained communication quality is less than a threshold, the indicator causes the plurality of APs including the master AP to perform cooperative operation to transmit data. In the case where the obtained communication quality is not less than the threshold, the indicator causes the plurality of APs including the master AP to stop the cooperative operation.
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公开(公告)号：US11509434B2
公开(公告)日：2022-11-22
申请号：US17159330
申请日：2021-01-27
Inventor： Yutaka Murakami , Yoshio Urabe , Tomohiro Kimura , Mikihiro Ouchi
Abstract: A transmitting method includes: configuring a frame using a plurality of orthogonal frequency-division multiplexing (OFDM) symbols, by allocating time resources and frequency resources to a plurality of transmission data; and transmitting the frame, wherein the frame includes a first period in which a preamble which includes information on a frame configuration of the frame is transmitted, and a second period in which the plurality of transmission data are transmitted by at least one of time division and frequency division, and among the plurality of OFDM symbols, OFDM symbols included in the second period include pilot symbols arranged along a time axis with a predetermined spacing therebetween, and a predetermined number of data symbols.
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公开(公告)号：US11469929B2
公开(公告)日：2022-10-11
申请号：US17324795
申请日：2021-05-19
Inventor： Yutaka Murakami , Kiyotaka Kobayashi , Masayuki Orihashi , Akihiko Matsuoka
IPC: H04L27/00 , H04B7/0417 , H04L1/00 , H04L1/06 , H04L1/08 , H04L27/34 , H04L5/00 , H04B7/0413 , H04B7/06 , H04W52/42
Abstract: Modulated signal A is transmitted from a first antenna, and modulated signal B is transmitted from a second antenna. As modulated signal B, modulated symbols S2(i) and S2(i+1) obtained from different data are transmitted at time i and time i+1 respectively. In contrast, as modulated signal A, modulated symbols S1(i) and S1(i)′ obtained by changing the signal point arrangement of the same data are transmitted at time i and time i+1 respectively. As a result the reception quality can be changed intentionally at time i and time i+1, and therefore using the demodulation result of modulated signal A of a time when the reception quality is good enables both modulated signals A and B to be demodulated with good error rate performances.
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公开(公告)号：US11368819B2
公开(公告)日：2022-06-21
申请号：US16939443
申请日：2020-07-27
Inventor： Yutaka Murakami
Abstract: A controller, which is a communication device, includes: a transfer unit including a function of transferring data received from a first terminal to another communication device via wireless communication; and a determination unit configured to determine whether first information is included in the data received by the transfer unit, the first information indicating that the data is to be multicast. The transfer unit is further configured to multicast the data to a second terminal when the determination unit determines that the first information is included in the data, the second terminal and the first terminal being different terminals.
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公开(公告)号：US11323151B2
公开(公告)日：2022-05-03
申请号：US17333334
申请日：2021-05-28
Inventor： Yutaka Murakami , Nobuhiko Hashida
IPC: H04B3/54 , H02J50/80 , H02J50/10 , B60L53/12 , B60L53/66 , B60L53/30 , H02J7/00 , H02J7/02 , H04L67/01
Abstract: A communication system includes one or more chargers and a server capable of communicating with the one or more chargers. The server obtains first information from a first vehicle via a first charger included in the one or more chargers, during charging of the first vehicle by the first charger, and supplies second information based on the first information to a second vehicle via a second charger included in the one or more chargers, during charging of the second vehicle by the second charger.
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