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公开(公告)号：US12119896B2
公开(公告)日：2024-10-15
申请号：US18218668
申请日：2023-07-06
发明人： Tomohiro Kimura , Yutaka Murakami , Mikihiro Ouchi
IPC分类号： H04B7/04 , H04B1/16 , H04B7/0404 , H04B7/0413 , H04B7/06 , H04B7/08 , H04N21/2365 , H04N21/426 , H04W4/06 , H04W16/26 , H04W16/28 , H04W76/40 , H04B7/10
CPC分类号： H04B7/0413 , H04B1/16 , H04B7/0404 , H04B7/0697 , H04B7/0874 , H04N21/2365 , H04N21/42615 , H04N21/4263 , H04W4/06 , H04W16/26 , H04W16/28 , H04W76/40 , H04B7/10
摘要： 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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2.发明公开公开(公告)号：US20240235754A1
公开(公告)日：2024-07-11
申请号：US18615499
申请日：2024-03-25
发明人： Yutaka MURAKAMI , Yoshio Urabe , Tomohiro Kimura , Mikihiro Ouchi
CPC分类号： H04L5/0044 , H04J1/02 , H04J3/02 , H04L1/0075 , H04L27/265 , H04L27/26522 , H04J11/00 , H04J2011/0016 , H04L5/0007 , H04L5/0053
摘要： 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：US11902067B2
公开(公告)日：2024-02-13
申请号：US18090731
申请日：2022-12-29
发明人： Yutaka Murakami , Tomohiro Kimura , Mikihiro Ouchi
CPC分类号： H04L27/2604 , H04B7/0413 , H04B7/06 , H04B7/0682 , H04B7/0697 , H04B7/08 , H04L27/3405 , H04L27/3416 , H04L27/36 , H04L27/38 , H04L1/005 , H04L1/0071
摘要： 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：US11671166B2
公开(公告)日：2023-06-06
申请号：US16932015
申请日：2020-07-17
发明人： Yutaka Murakami , Tomohiro Kimura , Mikihiro Ouchi
IPC分类号： H04B7/10 , H04B7/0408 , H04B7/0452 , H04B7/06 , H04B7/08
CPC分类号： H04B7/10 , H04B7/0408 , H04B7/0452 , H04B7/063 , H04B7/0617 , H04B7/0684 , H04B7/0882
摘要： Provided is a transmitting device which can expand a communication range when performing multicast/broadcast communication. The 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. When the transmitter has received, from a terminal, a request to transmit the first stream, the transmitter further generates, from the first baseband signal, third transmission signals which are different from the first transmission signals and have different directivities, and transmits the third transmission signals.
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公开(公告)号：US11637626B2
公开(公告)日：2023-04-25
申请号：US17714286
申请日：2022-04-06
发明人： Mikihiro Ouchi , Tomohiro Kimura , Takayuki Sotoyama , Naoki Adachi , Naoya Shibaike , Shutai Okamura
摘要： A signal processing device includes: a transmission path estimator that estimates a first transmission path characteristic of a transmission signal using a vertical signal out of vertical and horizontal signals resulting from being received by a vertical polarization antenna and a horizontal polarization antenna; a transmission path estimator that estimates a second transmission path characteristic of the transmission signal using the horizontal signal; a weight calculator that calculates a first weight for the vertical signal and a second weight for the horizontal signal, using the first transmission path characteristic and the second transmission path characteristic; and a weighting applier that applies weighted summation to the vertical signal and the horizontal signal using the first weight and the second weight.
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公开(公告)号：US11581995B2
公开(公告)日：2023-02-14
申请号：US15580988
申请日：2016-06-01
发明人： Yutaka Murakami , Tomohiro Kimura , Mikihiro Ouchi
摘要： Provided are a frame configuring unit configured to configure 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 a transmitter which transmits the frame. The frame includes a first period in which a preamble which includes information on a frame configuration of the frame is transmitted, a second period in which a plurality of transmission data are transmitted by time division, a third period in which a plurality of transmission data are transmitted by frequency division, and a fourth period in which a plurality of transmission data are transmitted by time division and frequency division.
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公开(公告)号：US11184041B2
公开(公告)日：2021-11-23
申请号：US17036622
申请日：2020-09-29
发明人： Tomohiro Kimura , Mikihiro Ouchi
摘要： A transmission device includes a first mapper, a second mapper, a converter, a superposer, and a transmitter. The first mapper is configured to map a first bit stream of a first data series to generate a first modulated symbol stream. The second mapper is configured to map a second bit stream of a second data series to generate a second modulated symbol stream. The first modulated symbol stream and the second modulated symbol stream are representable on a complex plane extending in a first direction and a second direction. The converter is configured to convert the second modulated symbol stream in accordance with the first modulated symbol stream only in the first direction on the complex plane. The superposer is configured to superpose the first modulated symbol stream and the second modulated symbol stream converted by the converter, at an amplitude ratio, to generate a multiplexed signal.
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公开(公告)号：US10979276B2
公开(公告)日：2021-04-13
申请号：US16848057
申请日：2020-04-14
发明人： Yutaka Murakami , Tomohiro Kimura , Mikihiro Ouchi
IPC分类号： H04L27/36 , H04L27/34 , H04L27/18 , H04L27/20 , H04L27/38 , H04L27/00 , H04L27/04 , H04L5/00
摘要： 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：US10931343B2
公开(公告)日：2021-02-23
申请号：US15770961
申请日：2016-10-25
发明人： Yutaka Murakami , Tomohiro Kimura , Mikihiro Ouchi
IPC分类号： H04B7/02 , H01Q3/26 , H04B7/06 , H04B7/0408
摘要： 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：US10790887B2
公开(公告)日：2020-09-29
申请号：US16235236
申请日：2018-12-28
IPC分类号： H04B7/0456 , H04B7/0413 , H04B7/06 , H04B7/0417
摘要： 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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