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公开(公告)号：US11184060B2
公开(公告)日：2021-11-23
申请号：US16791312
申请日：2020-02-14
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 precoded 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：US11153125B2
公开(公告)日：2021-10-19
申请号：US16476063
申请日：2018-01-29
Inventor： Yutaka Murakami , Yasuaki Yuda
Abstract: A transmission apparatus according to the present disclosure includes a plurality of user modulated signal generators. A user #k modulated signal generator (104_k) (where k=1 to n) generates a modulated signal including reference signals for phase noise estimation (PT-RS: Reference Signal for Phase Tracking), for a plurality of reception apparatuses. A wireless unit (109_A, 109_B) transmits the generated modulated signal. A correction coefficient of transmission power for the reference signals is associated with a pattern of a sequence used as the reference signals, on a one-to-one basis.
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243.发明授权公开(公告)号：US11063693B2
公开(公告)日：2021-07-13
申请号：US16561308
申请日：2019-09-05
Inventor： Yutaka Murakami , Shutai Okamura
IPC: H04L1/00 , H03M13/11 , H03M13/00 , H03M13/27 , H03M13/35 , H04L1/18 , H03M13/37 , H04L1/08 , H03M13/17
Abstract: A loss correction encoding device having an improved capability of loss correction using LDPC-CC includes a rearranging unit that rearranges information data contained in n information packets according to the constraint length Kmax and the encoding rate (q−1)/q of a check polynomial of the loss correction code used in a loss correction encoding unit. Specifically, the rearranging unit rearranges the information data in such a way that continuous Kmax×(q−1) pieces of information data after rearrangement are contained in different information packets. The rearranging unit distributes the information data to information blocks from n information packets, where n satisfies the formula Kmax×(q−1)≤n.
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公开(公告)号：US11057075B2
公开(公告)日：2021-07-06
申请号：US16856710
申请日：2020-04-23
Inventor： Yutaka Murakami , Nobuhiko Hashida
IPC: H04B3/54 , H02J50/80 , H02J50/10 , B60L53/12 , B60L53/66 , B60L53/30 , H02J7/00 , H02J7/02 , H04L29/06
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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公开(公告)号：US11032027B2
公开(公告)日：2021-06-08
申请号：US16527609
申请日：2019-07-31
Inventor： Yutaka Murakami , Tomohiro Kimura , Mikihiro Ouchi
Abstract: One coding method of a plurality of coding methods including at least a first coding method and a second coding method is selected, an information sequence is encoded by using the selected coding method, and an encoded sequence obtained by performing predetermined processing on the information sequence is modulated and transmitted. The first coding method is a coding method having a first coding rate, for generating a first encoded sequence by performing puncturing processing on a generated first codeword by using a first parity check matrix. The second coding method is a coding method having a second coding rate, for generating a second encoded sequence by performing puncturing processing on a generated second codeword by using a second parity check matrix that is different from the first parity check matrix, the second coding rate after the puncturing process being different from the first coding rate.
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Patent Agency Ranking
公开(公告)号：US10951294B2
公开(公告)日：2021-03-16
申请号：US16773204
申请日：2020-01-27
Inventor： Yutaka Murakami , Tomohiro Kimura , Mikihiro Ouchi
IPC: H04B7/06 , H04B7/0452 , H04L1/06 , H04L1/00 , H04B7/0456 , H04L27/26 , H04B1/707 , H04L27/00
Abstract: A transmission apparatus includes M signal processors that respectively generate modulated signals directed to M reception apparatuses, M being an integer equal to or greater than 2, and an antenna section. Each signal processor modulates a first bit sequence made up of two bits to generate a first modulated signal and a second modulated signal, and modulates a second bit sequence made up of other two bits to generate a third modulated signal and a fourth modulated signal, in a case of transmitting multiple streams to a corresponding one of the M reception apparatuses. The antenna section includes a first antenna that transmits the first modulated signal and the third modulated signal and a second antenna that transmits the second modulated signal and the fourth modulated signal. At least either the signals transmitted from the first antenna or the signals transmitted from the second antenna are phase-changed signals.
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公开(公告)号：US10924135B2
公开(公告)日：2021-02-16
申请号：US16421624
申请日：2019-05-24
Inventor： Yutaka Murakami , Kiyotaka Kobayashi , Choo Eng Yap
Abstract: In a multi-antenna communication system using LDPC codes, a simple method is used to effectively improve the received quality by performing a retransmittal of less data without restricting applicable LDPC codes. In a case of a non-retransmittal, a multi-antenna transmitting apparatus transmits, from two antennas, LDPC encoded data formed by LDPC encoding blocks. In a case of a retransmittal, the multi-antenna transmitting apparatus uses a transmission method, in which the diversity gain is higher than in the previous transmission, to transmit only a part of the LDPC encoded data as previously transmitted. For example, the only the part of the LDPC encoded data to be re-transmitted is transmitted from the single antenna.
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公开(公告)号：US10911278B2
公开(公告)日：2021-02-02
申请号：US17002343
申请日：2020-08-25
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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公开(公告)号：US10893532B2
公开(公告)日：2021-01-12
申请号：US16816121
申请日：2020-03-11
Inventor： Yutaka Murakami
IPC: H04W52/16 , H04W72/12 , H04W16/14 , H04L5/06 , H04W72/04 , H04L5/00 , H04L27/34 , H04J11/00 , H04L27/26
Abstract: A transmission method is provided for a communication system in which communications using a plurality of communication methods having different transmission parameters are performed at the same frequency (in frequency bands that at least partially overlap with each other). The transmission method includes: generating a first symbol group that includes a control symbol for causing a communication partner apparatus to recognize that communication using a first communication method is to be performed and a second symbol group that includes a data symbol for the first communication method; transmitting the first symbol group at a first transmit power; and transmitting the second symbol group at a second transmit power that is smaller than the first transmit power.
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公开(公告)号：US10790886B2
公开(公告)日：2020-09-29
申请号：US16090625
申请日：2017-04-11
Inventor： Yutaka Murakami , Tomohiro Kimura , Mikihiro Ouchi
IPC: H04W72/04 , G06F17/16 , H04B7/0456 , H04L5/00
Abstract: A precoding process is performed on a first baseband signal and a second baseband signal to generate a first precoding signal and a second precoding signal. A pilot signal is inserted into the first precoding signal and phase change is performed on the second precoding signal. A pilot signal is inserted into the phase changed second precoding signal, and phase change is further performed on the phase-changed second precoding signal with the pilot signal inserted.
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