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公开(公告)号：US11563522B2
公开(公告)日：2023-01-24
申请号：US17590761
申请日：2022-02-01
Inventor： Yutaka Murakami , Shutai Okamura , Kiyotaka Kobayashi , Masayuki Orihashi , Kazuaki Takahashi
Abstract: A transmitter apparatus wherein a simple structure is used to successfully suppress the degradation of error rate performance that otherwise would be caused by fading or the like. There are included encoding parts that encode transport data; a mapping part that performs such a mapping that encoded data sequentially formed by the encoding parts are not successively included in the same symbol, thereby forming data symbols; and a symbol interleaver that interleaves the data symbols. In this way, a low computational complexity can be used to perform an interleaving process equivalent to a bit interleaving process to effectively improve the reception quality at a receiving end.
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公开(公告)号：US11539378B2
公开(公告)日：2022-12-27
申请号：US17322541
申请日：2021-05-17
Inventor： Yutaka Murakami , Shutai Okamura
Abstract: Disclosed are an encoder, a transmission device, and an encoding method with which the transmission amount is reduced and a deterioration in transmission efficiency is suppressed while improving reception quality when QC-LDPC or a like block encoding is used. A puncture pattern setting unit (620) searches for a puncture pattern for each integral multiple of the number of columns or for each divisor of the number of columns of a sub block matrix that forms a check matrix (H) of a QC-LDPC code, and a puncture unit (data reduction unit) (630) switches the puncture pattern for each integral multiple of the number of columns or for each divisor of the number of columns of the sub block matrix that forms the check matrix of the QC-LDPC code.
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公开(公告)号：US11515965B2
公开(公告)日：2022-11-29
申请号：US17729658
申请日：2022-04-26
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：US11296912B2
公开(公告)日：2022-04-05
申请号：US16952777
申请日：2020-11-19
Inventor： Yutaka Murakami , Tomohiro Kimura , Mikihiro Ouchi , Hiroyuki Motozuka
IPC: H04L27/04 , H04B17/318 , H04B7/0408 , H04B7/0456 , H04L5/00 , 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：US11239888B2
公开(公告)日：2022-02-01
申请号：US17174461
申请日：2021-02-12
Inventor： Yutaka Murakami , Tomohiro Kimura , Mikihiro Ouchi
IPC: H04B7/06 , H04B7/04 , H04J11/00 , H04B7/0417 , H04L27/26
Abstract: A transmission method includes generating a first precoded signal and a second precoded signal by performing a precoding process on a first baseband signal and a second baseband signal, outputting a third signal by inserting a pilot signal into the first precoded signal, outputting a fourth signal by applying a first phase change to the second precoded signal, outputting a fifth signal by inserting a pilot signal into the fourth signal, and outputting a sixth signal by applying a second phase change to the fifth signal.
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Patent Agency Ranking
公开(公告)号：US11223457B2
公开(公告)日：2022-01-11
申请号：US16658994
申请日：2019-10-21
Inventor： Yutaka Murakami , Masayuki Orihashi , Akihiko Matsuoka
IPC: H04B7/06 , H04L5/00 , H04L1/06 , H04L27/26 , H04L27/04 , H04L27/12 , H04L27/14 , H04L27/06 , H04L29/06 , H04L27/18 , H04L25/02 , H04W52/52 , H04B7/0413 , H04B7/08 , H04W72/04
Abstract: A transmission apparatus includes a plurality of orthogonal frequency division multiplexing (OFDM) modulation signal generators, which generate a first OFDM modulation signal and a second OFDM modulation signal. The transmission apparatus also includes a transmitter that transmits the first OFDM modulation signal from a first antenna and the second OFDM modulation signal from a second antenna, in an identical frequency band. A reception apparatus is provided, which includes a plurality of antennas that receive a plurality of OFDM modulation signals; a plurality of OFDM demodulators that transform the plurality of OFDM modulation signals to a plurality of reception signals using Fourier transform; an estimator that outputs a distortion estimation signal using one or more symbols for demodulation included in the plurality of reception signals; and a demodulator that compensates for distortion of the reception signals using the distortion estimation signal and demodulates a data symbol included in the reception signals.
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公开(公告)号：US11201671B2
公开(公告)日：2021-12-14
申请号：US16744766
申请日：2020-01-16
Inventor： Yutaka Murakami , Nobuhiko Hashida
IPC: H04B10/00 , H04B10/116 , H04B10/85 , H04N7/22 , H04J14/00
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：US20210273832A1
公开(公告)日：2021-09-02
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
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：US11057084B2
公开(公告)日：2021-07-06
申请号：US16551084
申请日：2019-08-26
Inventor： Yutaka Murakami , Tomohiro Kimura , Mikihiro Ouchi
IPC: H04B7/0456 , H04B7/0452 , H04B7/06 , H04B7/0413
Abstract: Provided are M signal processors that respectively generate modulated signals for M reception apparatuses (where M is an integer equal to 2 or greater), a multiplexing signal processor, and N antenna sections (where N is an integer equal to 1 or greater). When transmitting multiple streams, each of the M signal processors generates two mapped signals, generates first and second precoded signals by precoding the two mapped signals, periodically changes the phase of signal points in the IQ plane with respect to the second precoded signal, outputs the phase-changed signal, and outputs the first precoded signal and the phase-changed second precoded signal as two modulated signals. When transmitting a single stream, each of the M signal processor outputs a single modulated signal. The multiplexing signal processor multiplexes the modulated signals output from the M signal processors, and generates N multiplexed signals. The N antenna sections respectively transmit the N multiplexed signals.
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公开(公告)号：US11044131B2
公开(公告)日：2021-06-22
申请号：US16436091
申请日：2019-06-10
Inventor： Yutaka Murakami , Tomohiro Kimura , Mikihiro Ouchi , Hiroyuki Motozuka
IPC: H04L27/26 , H04L5/00 , H04B7/0456 , H04B7/06
Abstract: A transmission device that improves data reception quality includes: a first pilot inserter that inserts a pilot signal into a 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 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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