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公开(公告)号：US10601446B2
公开(公告)日：2020-03-24
申请号：US14994503
申请日：2016-01-13
Inventor： Yutaka Murakami
Abstract: An encoding method generates an encoded sequence by performing encoding of a given coding rate according to a predetermined parity check matrix. The predetermined parity check matrix is a first parity check matrix or a second parity check matrix. The first parity check matrix corresponds to a low-density parity check (LDPC) convolutional code using a plurality of parity check polynomials. The second parity check matrix is generated by performing at least one of row permutation and column permutation with respect to the first parity check matrix. An eth parity check polynomial that satisfies zero, of the LDPC convolutional code, is expressible by using a predetermined mathematical formula.
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公开(公告)号：US10560296B2
公开(公告)日：2020-02-11
申请号：US16039658
申请日：2018-07-19
Inventor： Yutaka Murakami , Tomohiro Kimura , Mikihiro Ouchi
IPC: H04L27/26 , H04B7/0413 , H04L5/00 , H04J11/00 , H04B7/10
Abstract: A transmitting apparatus according to one aspect of the present disclosure transmits a plurality of first transmission data and a plurality of second transmission data by using an OFDM (Orthogonal Frequency-Division Multiplexing) method. The transmitting apparatus includes frame configuring circuitry, which in operation, generates a frame including a first period in which a preamble is transmitted, a second period in which the plurality of first transmission data is multiplexed by a time division multiplexing method and is transmitted, and a third period in which the plurality of second transmission data is multiplexed by a frequency division multiplexing method and is transmitted; and transmitting circuitry that transmits the frame.
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公开(公告)号：US10547479B2
公开(公告)日：2020-01-28
申请号：US16296568
申请日：2019-03-08
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 , H04B7/06 , H04W52/42
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：US10484220B2
公开(公告)日：2019-11-19
申请号：US15736995
申请日：2016-06-13
Inventor： Yutaka Murakami , Yoshio Urabe , Tomohiro Kimura , Mikihiro Ouchi
IPC: H04L27/26 , H04L1/16 , H04L5/00 , H04B7/00 , H04B7/0413 , H04B7/06 , H04B7/0456 , H04J11/00
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：US10477153B2
公开(公告)日：2019-11-12
申请号：US16171059
申请日：2018-10-25
Inventor： Yutaka Murakami
IPC: H04W24/00 , H04N7/173 , H04B1/3827 , H04W48/18 , H04W8/18 , H04W36/00 , H04W48/12 , H04W52/02 , H04W72/04 , H04W84/00 , H04W88/06
Abstract: Control circuitry in a terminal apparatus generates one or more groups, each group including a selected plurality of communication methods whose total value of specific absorption rates (SARs) is equal to or less than a threshold value, and generates group information indicating the one or more groups. N transmitters transmit transmission data to a plurality of communication stations that respectively support the plurality of communication methods included in one group that is indicated by the group information, by using corresponding communication methods.
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Patent Agency Ranking
公开(公告)号：US10461984B2
公开(公告)日：2019-10-29
申请号：US16245546
申请日：2019-01-11
Inventor： Yutaka Murakami , Tomohiro Kimura , Mikihiro Ouchi
IPC: H04L27/34 , H04B7/0456 , H04L27/26 , H04L27/36 , H04L1/00
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：US10404395B2
公开(公告)日：2019-09-03
申请号：US15579685
申请日：2016-06-01
Inventor： Yutaka Murakami , Tomohiro Kimura , Mikihiro Ouchi
Abstract: A first transmission signal and a second transmission signal are generated from a first modulated signal and a second modulated signal by using a precoding matrix, and parameters of the precoding matrix are calculated from feedback information.
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公开(公告)号：US10277436B2
公开(公告)日：2019-04-30
申请号：US15902371
申请日：2018-02-22
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 , H04B7/06 , H04W52/42
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：US20180302204A1
公开(公告)日：2018-10-18
申请号：US16015053
申请日：2018-06-21
Inventor： Yutaka Murakami , Masayuki Orihashi , Akihiko Matsuoka
IPC: H04L5/00 , H04W52/52 , H04B7/06 , H04L1/06 , H04L29/06 , H04L27/26 , H04L27/18 , H04L27/14 , H04L27/12 , H04L27/06 , H04L27/04 , H04L25/02 , H04B7/08 , H04B7/0413 , H04W72/04
CPC classification number: H04L5/0048 , H04B7/0413 , H04B7/06 , H04B7/0626 , H04B7/0632 , H04B7/0671 , H04B7/0689 , H04B7/0697 , H04B7/082 , H04L1/0618 , H04L5/0023 , H04L5/003 , H04L25/0204 , H04L25/0206 , H04L27/04 , H04L27/06 , H04L27/12 , H04L27/14 , H04L27/18 , H04L27/2601 , H04L27/2602 , H04L27/2627 , H04L27/2649 , H04L27/2657 , H04L27/2659 , H04L27/2691 , H04L27/2695 , H04L69/22 , H04W52/52 , H04W72/0453
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：US10033551B2
公开(公告)日：2018-07-24
申请号：US15648218
申请日：2017-07-12
Inventor： Yutaka Murakami , Masayuki Orihashi , Akihiko Matsuoka
IPC: H04B7/02 , H04L25/02 , H04L27/26 , H04L29/06 , H04L5/00 , H04L1/06 , H04B7/06 , H04L27/14 , H04L27/12 , H04L27/06 , H04L27/04 , H04B7/0413 , H04B7/08 , H04L27/18
CPC classification number: H04L5/0048 , H04B7/0413 , H04B7/06 , H04B7/0626 , H04B7/0632 , H04B7/0671 , H04B7/0689 , H04B7/0697 , H04B7/082 , H04L1/0618 , H04L5/0023 , H04L5/003 , H04L25/0204 , H04L25/0206 , H04L27/04 , H04L27/06 , H04L27/12 , H04L27/14 , H04L27/18 , H04L27/2601 , H04L27/2602 , H04L27/2627 , H04L27/2649 , H04L27/2657 , H04L27/2659 , H04L27/2691 , H04L27/2695 , H04L69/22 , H04W52/52 , H04W72/0453
Abstract: A transmission apparatus includes orthogonal frequency division multiplexing (OFDM) modulation signal generating circuitry. The circuitry generates a first OFDM modulation signal by inserting symbols for demodulation in a first plurality of subcarriers at a first time and in a second plurality of sub-carriers at a second time adjacent to the first time, the symbols for demodulation being reception processing reference symbols of a reception apparatus, and, inserting symbols, having both an in-phase (I) component and a quadrature-phase (Q) component in an I-Q plane of zero, in the second plurality of sub-carriers at the first time and in the first plurality of sub-carriers at the second time. The circuitry generates a second OFDM modulation signal by inserting the symbols for demodulation in the second plurality of subcarriers at the first time and in the first plurality of sub-carriers at the second time, and, inserting the symbols, having both the I component and the Q component in the I-Q plane of zero, in the first plurality of sub-carriers at the first time and in the second plurality of sub-carriers at the second time. The apparatus includes transmitting circuitry to transmit the first and the second OFDM modulation signals, from respective different antennas, in an identical frequency band.
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