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公开(公告)号：US20210184694A1
公开(公告)日：2021-06-17
申请号：US17150766
申请日：2021-01-15
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 (100) transmits, from two antennas (114A,114B), LDPC encoded data formed by LDPC encoding blocks (102A,102B). In a case of a retransmittal, the multi-antenna transmitting apparatus (100) 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 (114A).
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公开(公告)号：US20210143881A1
公开(公告)日：2021-05-13
申请号：US17152173
申请日：2021-01-19
Inventor： Yutaka MURAKAMI , Tomohiro KIMURA , Mikihiro OUCHI
IPC: H04B7/06 , H04B7/0408
Abstract: A transmitting device includes a plurality of transmission antennas, and includes: a signal processor which generates a first baseband signal by modulating data of a first stream, and a second baseband signal by modulating data of a second stream; and a transmitter which generates, from the first baseband signal, first transmission signals having different directivities, generates, from the second baseband signal, second transmission signals having different directivities, and transmits the first transmission signals and the second transmission signals at a same time.
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公开(公告)号：US20210050916A1
公开(公告)日：2021-02-18
申请号：US17089624
申请日：2020-11-04
Inventor： Yutaka MURAKAMI
IPC: H04B10/116 , H04W48/20 , H04W48/16 , B64D11/00 , H04W12/06 , H04W48/08 , H04W84/12 , H04B10/2575
Abstract: A terminal (1050) includes a light receiver (151) that receives a light signal emitted by an apparatus (1000), the light signal including an identifier (SSID) of at least one base station (470); a receiver (153) that performs a reception process on the received light signal to output reception data; a data analyzer (155) that selects one base station based on the identifier of the at least one base station that is included in the reception data; and a radio device (453) that establishes a wireless connection with the selected base station (470) by using the identifier of the base station (470) and wirelessly communicates with the base station (470).
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公开(公告)号：US20210044346A1
公开(公告)日：2021-02-11
申请号：US16968144
申请日：2019-01-30
Inventor： Yutaka MURAKAMI
IPC: H04B7/15 , H04W72/04 , H04B7/0413 , H04W40/22
Abstract: This communication device relays a relay signal to be transmitted to and from a first communication device and a second communication device, and is connected to a first apparatus. The communication device transmits the relay signal using a first transmission slot, and also transmits, using a second transmission slot, a signal having been transmitted from the first apparatus, said signal being transmitted within the transmission period of the first transmission slot in a frequency domain different from that of the first transmission slot.
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225.发明申请公开(公告)号：US20200328809A1
公开(公告)日：2020-10-15
申请号：US16916672
申请日：2020-06-30
Inventor： Yutaka MURAKAMI
IPC: H04B10/116 , H04W84/12 , H04W48/16 , H04W76/11 , H04W48/08
Abstract: Provided is a device, which is a transmission device that can improve performance, that includes: a light source; and a transmitter that generates a modulated signal based on an input signal and transmits the modulated signal from the light source as visible light by changing a luminance of the light source in accordance with the modulated signal. The transmitter includes, in the modulated signal, a plurality of items of information related to service set identifiers (SSIDs) of a plurality of mutually different access points in a wireless local area network (LAN), and transmits the modulated signal from the light source.
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Patent Agency Ranking
公开(公告)号：US20200313797A1
公开(公告)日：2020-10-01
申请号：US16901295
申请日：2020-06-15
Inventor： Yutaka MURAKAMI , Tomohiro KIMURA , Mikihiro OUCHI
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：US20200313774A1
公开(公告)日：2020-10-01
申请号：US16902619
申请日：2020-06-16
Inventor： Yutaka MURAKAMI , Nobuhiko HASHIDA , Ryutaro MONDEN
IPC: H04B10/54 , H04B10/116 , H04B10/508
Abstract: A transmission method includes: in a first period, causing a light source to emit light having a first luminance; and in a second period, causing the light source to transmit an optical signal by causing the light source to alternately emit light having a second luminance and light having a third luminance lower than the second luminance.
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公开(公告)号：US20200266833A1
公开(公告)日：2020-08-20
申请号：US16862239
申请日：2020-04-29
Inventor： Yutaka MURAKAMI
Abstract: A decoding method includes inputting coded data, and decoding the coded data to obtain decoded data. The coded data are generated by using an encoding process at an encoding apparatus, and the encoding process includes: (i) repeatedly-selecting and collecting first packets included in the decoded data to generate at least one second packet; (ii) dividing at least one third packet included in the decoded data into fourth packets; and (iii) allocating fifth packets included in the decoded data to respective sixth packets without collecting the first packets or dividing the at least one third packet, and performing an error correcting encoding on the at least one second packet, the fourth packets, and the sixth packets in accordance with a coding rate selected from a plurality of coding rates to generate parity data.
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公开(公告)号：US20200228205A1
公开(公告)日：2020-07-16
申请号：US16831344
申请日：2020-03-26
Inventor： Yutaka MURAKAMI
IPC: H04B10/116 , H04B10/2575 , H04W48/08 , H04W48/16 , H04W84/12 , H04W48/20 , H04W12/06
Abstract: A terminal (1050) includes a light receiver (151) that receives a light signal emitted by an apparatus (1000), the light signal including an identifier (SSID) of at least one base station (470); a receiverreceiver (153) that performs a reception process on the received light signal to output reception data; a data analyzer (155) that selects one base station based on the identifier of the at least one base station that is included in the reception data; and a radio device (453) that establishes a wireless connection with the selected base station (470) by using the identifier of the base station (470) and wirelessly communicates with the base station (470).
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公开(公告)号：US20200186282A1
公开(公告)日：2020-06-11
申请号：US16793763
申请日：2020-02-18
Inventor： Tomohiro KIMURA , Yutaka MURAKAMI , Mikihiro OUCHI
Abstract: A reception device includes: a receiver that receives a multiplexed signal; a first demapper that demaps the multiplexed signal, with a second modulated symbol stream of a second data series being included in the multiplexed signal as an undefined signal component, to generate a first bit likelihood stream of a first data series; a second demapper that demaps the multiplexed signal, with a first modulated symbol stream of the first data series being included in the multiplexed signal as an undefined signal component, to generate a second bit likelihood stream of the second data series; a first decoder that performs error control decoding on the first bit likelihood stream to derive the first data series; and a second decoder that performs error control decoding on the second bit likelihood stream to derive the second data series.
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