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公开(公告)号：US20200153507A1
公开(公告)日：2020-05-14
申请号：US16744766
申请日：2020-01-16
Inventor： Yutaka MURAKAMI , Nobuhiko HASHIDA
IPC: H04B10/116 , H04N7/22 , H04B10/85
Abstract: A communication system includes: a plurality of cameras that generate image data by capturing images; a server that stores the image data generated by each of the plurality of cameras; and a plurality of transmission devices in one-to-one correspondence with the plurality of cameras. Each of the plurality of transmission devices transmits light including, as a visible light communication signal, information related to communication for accessing a storage location at which the image data generated by a corresponding one of the plurality of cameras is stored in the server.
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公开(公告)号：US20200099447A1
公开(公告)日：2020-03-26
申请号：US16697475
申请日：2019-11-27
Inventor： Yutaka MURAKAMI , Ryutaro MONDEN , Nobuhiko HASHIDA
IPC: H04B10/116 , G06K9/20 , H04N5/232 , H04W48/08
Abstract: A reception device includes: an image sensor that captures an image, and a reception unit configured to sample a plurality of pixels included in each of N (N being an integer greater than or equal to two) regions included in an imaging surface of the image sensor to receive, in parallel, N mutually different optical signals transmitted from a plurality of light sources.
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公开(公告)号：US20200067623A1
公开(公告)日：2020-02-27
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：US20200014577A1
公开(公告)日：2020-01-09
申请号：US16573458
申请日：2019-09-17
Inventor： Yutaka MURAKAMI , Tomohiro KIMURA , Mikihiro OUCHI
Abstract: Provided is a transmission method that improves data reception quality in radio transmission using a single-carrier scheme and/or a multi-carrier scheme. The transmission method includes: generating a plurality of first modulated signals and a plurality of second modulated signals from transmission data, the plurality of first modulated signals being signals generated using a 16 QAM modulation scheme, and the plurality of second modulated signals being signals generated using uniform constellation 64 QAM modulation; generating, from the plurality of first modulated signals and the plurality of second modulated signals, a plurality of first signal-processed signals and a plurality of second signal-processed signals which satisfy a predetermined equation; and changing the predetermined equation when a 64 QAM modulation used to generate the plurality of second modulated signals is switched from the uniform constellation 64 QAM modulation to a non-uniform constellation 64 QAM modulation.
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公开(公告)号：US20190356363A1
公开(公告)日：2019-11-21
申请号：US16529190
申请日：2019-08-01
Inventor： Tomohiro KIMURA , Yutaka MURAKAMI , Mikihiro OUCHI
IPC: H04B7/0413 , H04W76/40 , H04N21/426 , H04N21/2365 , H04B7/0404 , H04B7/06 , H04B7/08 , H04W16/28 , H04W16/26 , H04W4/06 , H04B1/16
Abstract: By a transmission method according to one aspect of the present disclosure, in a broadcasting system that generates a first broadcasting signal and a second broadcasting signal by performing multi-antenna encoding on program data, and wirelessly transmits a first broadcasting signal and a second broadcasting signal, a first transmit station transmits the first broadcasting signal, a second transmit station transmits the second broadcasting signal, the first transmit station and the second transmit station transmit the first broadcasting signal and the second broadcasting signal to an overlapping area at an identical time using an overlapping frequency band, polarized wave transmitted from the first transmit station differs from polarized wave transmitted from the second transmit station, and arrangement of the first transmit station differs from arrangement of the second transmit station.
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Patent Agency Ranking
公开(公告)号：US20190312769A1
公开(公告)日：2019-10-10
申请号：US16448607
申请日：2019-06-21
Inventor： Yutaka MURAKAMI , Tomohiro KIMURA , Mikihiro OUCHI
Abstract: Provided is a transmission method that improves data reception quality in radio transmission using a single-carrier scheme and/or a multi-carrier scheme. The transmission method includes: generating a plurality of first modulated signals s1(i) and second modulated signals s2(i) from transmission data, the plurality of first modulated signals s1(i) being signals generated using a QPSK modulation scheme, and the plurality of second modulated signals s2(i) being signals generated using 16QAM modulation; generating, from the plurality of first modulated signals s1(i) and the plurality of second modulated signals s2(i), a plurality of first signal-processed signals z1(i) and a plurality of second signal-processed signals z2(i) which satisfy a predetermined equation; and transmitting the plurality of first signal-processed signals z1(i) and the plurality of second signal-processed signals z2(i) using a plurality of antennas. A first signal-processed signal and a second signal-processed signal having identical symbol numbers are simultaneously transmitted at the same frequency.
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公开(公告)号：US20190305883A1
公开(公告)日：2019-10-03
申请号：US16444663
申请日：2019-06-18
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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公开(公告)号：US20190149385A1
公开(公告)日：2019-05-16
申请号：US16245546
申请日：2019-01-11
Inventor： Yutaka MURAKAMI , Tomohiro KIMURA , Mikihiro OUCHI
CPC classification number: H04L27/3433 , H04B7/0456 , H04L1/0003 , H04L27/26 , H04L27/3472 , H04L27/36
Abstract: Provided is a transmission method that improves data reception quality in radio transmission using a single-carrier scheme and/or a multi-carrier scheme. The transmission method includes: generating a plurality of first modulated signals and a plurality of second modulated signals from transmission data, the plurality of first modulated signals being signals generated using a 16 QAM modulation scheme, and the plurality of second modulated signals being signals generated using uniform constellation 64 QAM modulation; generating, from the plurality of first modulated signals and the plurality of second modulated signals, a plurality of first signal-processed signals and a plurality of second signal-processed signals which satisfy a predetermined equation; and changing the predetermined equation when a 64 QAM modulation used to generate the plurality of second modulated signals is switched from the uniform constellation 64 QAM modulation to a non-uniform constellation 64 QAM modulation.
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公开(公告)号：US20190028228A1
公开(公告)日：2019-01-24
申请号：US16138289
申请日：2018-09-21
Inventor： Tomohiro KIMURA , Yutaka MURAKAMI , Mikihiro OUCHI
CPC classification number: H04J15/00 , H04J14/005 , H04L27/183 , H04L27/32 , H04L27/3488
Abstract: A transmission device includes: a first mapper that maps a first bit stream of a first data series to generate a first modulated symbol stream of the first data series; a second mapper that maps a second bit stream of a second data series to generate a second modulated symbol stream of the second data series; a converter that subjects the second modulated symbol stream to conversion in accordance with the first modulated symbol stream; a superposition unit that superposes the first modulated symbol stream and the second modulated symbol stream at a predetermined amplitude ratio to generate a multiplexed signal, the second modulated symbol stream having been subjected to the conversion in accordance with the first modulated symbol stream; and a transmitter that transmits the multiplexed signal.
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公开(公告)号：US20180227613A1
公开(公告)日：2018-08-09
申请号：US15942845
申请日：2018-04-02
Inventor： Yutaka MURAKAMI , Tomohiro KIMURA
IPC: H04N21/242 , H04N21/462 , H04H20/18 , H04N21/2381
CPC classification number: H04N21/242 , H04H20/18 , H04N21/2381 , H04N21/462 , H04N21/4622
Abstract: Provided is a method for transmitting a broadcasting content and a line content, the broadcasting content and the line content being synchronously displayed, the method including: generating a line parity packet from a plurality of line data packets in each of which the line content is stored; transmitting the line data packet and the line parity packet through a communication line; and transmitting a plurality of broadcasting data packets in each of which the broadcasting content is stored, from a base station using a broadcasting wave, a transfer clock time of the broadcasting content being delayed by a predetermined time compared with a transfer clock time of the line content. At this point, video quality can be improved when the real-time broadcasting program content and the real-time line content are simultaneously displayed.
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