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公开(公告)号：US20230146368A1
公开(公告)日：2023-05-11
申请号：US18090731
申请日：2022-12-29
Inventor： Yutaka MURAKAMI , Tomohiro KIMURA , Mikihiro OUCHI
CPC classification number: H04L27/2604 , H04B7/06 , H04B7/08 , H04B7/0413 , H04B7/0682 , H04B7/0697 , H04L27/36 , H04L27/38 , H04L27/3405 , H04L27/3416 , H04L1/005
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：US20230031907A1
公开(公告)日：2023-02-02
申请号：US17960240
申请日：2022-10-05
Inventor： Yutaka MURAKAMI , Yoshio URABE , Tomohiro KIMURA , Mikihiro OUCHI
IPC: H04L27/26 , H04L5/00 , H04B7/0413 , H04B7/00 , H04L1/16 , H04B7/06 , H04B7/0456
Abstract: A transmitting method includes: configuring a frame using a plurality of orthogonal frequency-division multiplexing (OFDM) symbols, by allocating a plurality of transmission data to a plurality of areas; and transmitting the frame. The plurality of areas are each identified by at least one time resource among resources and at least one frequency resource among frequency resources. The frame includes a first period in which a preamble 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. The second period includes a first area, and the first area includes a data symbol generated from first transmission data, a data symbol generated from second transmission data and subsequent to the data symbol generated from the first transmission data, and a dummy symbol subsequent to the data symbol generated from the second transmission data.
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公开(公告)号：US20220303007A1
公开(公告)日：2022-09-22
申请号：US17834738
申请日：2022-06-07
Inventor： Yutaka MURAKAMI
IPC: H04B10/116 , H04W4/40 , H04B10/114 , H04W64/00
Abstract: Useful data is transmitted to a terminal existing in a transportation vehicle. A communication apparatus installed in the transportation vehicle and configured to transmit the data to the terminal existing in the transportation vehicle includes a data selection unit and an illumination unit. The data selection unit acquires location information indicating a location of the transportation vehicle in which the terminal exists and which is traveling. Based on the acquired location information, the data selection unit selects approaching-location data related to a location ahead of a current location of the transportation vehicle in a traveling direction from a plurality of pieces of data related to the location. The illumination unit transmits, as a modulated light signal, a signal comprising the approaching-location data.
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公开(公告)号：US20220255695A1
公开(公告)日：2022-08-11
申请号：US17629296
申请日：2020-07-17
Inventor： Yutaka MURAKAMI
Abstract: This communication system comprises: a first radio-communication device that transmits a plurality of first reference signals with controlled directivity in a time-sharing manner in a first period; and a second radio-communication device that transmits a plurality of second reference signals with controlled directivity to the first radio-communication device in a time-sharing manner in a second period, the second reference signal including information on directivity corresponding to any one of the first reference signals received from the first radio-communication device.
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公开(公告)号：US20220255597A1
公开(公告)日：2022-08-11
申请号：US17727635
申请日：2022-04-22
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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Patent Agency Ranking
公开(公告)号：US20220183010A1
公开(公告)日：2022-06-09
申请号：US17682481
申请日：2022-02-28
Inventor： Yutaka MURAKAMI , Nobuhiko HASHIDA
IPC: H04W72/04
Abstract: A first apparatus that performs sensing to sense a second apparatus via radio waves includes: a communication unit that receives a frame transmitted by the second apparatus via radio waves and senses the second apparatus using the received frame; and a controller that selects, from among predetermined frequencies, a frequency for the second apparatus to transmit the radio waves at, notifies the second apparatus of the selected frequency, and controls the communication unit perform the sensing using the frequency.
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公开(公告)号：US20220182269A1
公开(公告)日：2022-06-09
申请号：US17673054
申请日：2022-02-16
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：US20220158762A1
公开(公告)日：2022-05-19
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：US20210409150A1
公开(公告)日：2021-12-30
申请号：US17463811
申请日：2021-09-01
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：US20210288665A1
公开(公告)日：2021-09-16
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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