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公开(公告)号：US12192000B2
公开(公告)日：2025-01-07
申请号：US18532791
申请日：2023-12-07
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：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：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：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：US20150381398A1
公开(公告)日：2015-12-31
申请号：US14845132
申请日：2015-09-03
Inventor： Yutaka Murakami , Masayuki Orihashi , Akihiko Matsuoka
CPC classification number: H04L25/0204 , H04B7/0413 , H04B7/06 , H04B7/0626 , H04B7/0632 , H04B7/0671 , H04B7/0689 , H04B7/0697 , H04B7/082 , H04L1/0618 , H04L5/0023 , H04L5/003 , H04L5/0048 , 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.
Abstract translation: 发送装置包括生成第一OFDM调制信号和第二OFDM调制信号的多个正交频分复用（OFDM）调制信号发生器。 发送装置还包括在相同频带中从第一天线发送第一OFDM调制信号和来自第二天线的第二OFDM调制信号的发送器。 提供了一种接收装置，其包括接收多个OFDM调制信号的多个天线; 多个OFDM解调器，其使用傅里叶变换将所述多个OFDM调制信号变换为多个接收信号; 估计器，其使用所述多个接收信号中包含的用于解调的一个或多个符号来输出失真估计信号; 以及解调器，其使用失真估计信号来补偿接收信号的失真，并且解调包含在接收信号中的数据符号。
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Patent Agency Ranking
公开(公告)号：US09112595B2
公开(公告)日：2015-08-18
申请号：US13891027
申请日：2013-05-09
Inventor： Yutaka Murakami , Shinichiro Takabayashi , Masayuki Orihashi , Akihiko Matsuoka
IPC: H04B1/711 , H04B1/707 , H04B1/7075 , H04J13/00 , H04L1/00 , H04L27/18 , H04L27/227 , H04L27/26 , H04L27/34 , H04L27/38 , H04L5/00 , H04L27/00
CPC classification number: H04B1/711 , H04B1/707 , H04B1/7075 , H04B2201/70705 , H04B2201/70716 , H04B2201/70728 , H04J13/00 , H04L1/0003 , H04L1/0023 , H04L5/0007 , H04L5/0016 , H04L5/0044 , H04L5/0048 , H04L27/18 , H04L27/227 , H04L27/2602 , H04L27/2662 , H04L27/34 , H04L27/364 , H04L27/38 , H04L2027/004 , H04L2027/0061
Abstract: A transmitting apparatus includes an OFDM modulator that generates a first modulation symbol by modulating a first information signal using a first modulation scheme, a signal point of the first modulated information signal being at a first position in an in-phase quadrature-phase plane. A second modulation symbol by modulating a second information signal using the first modulation scheme, and by changing a second position at which a signal point of the modulated second information signal is arranged to a third position in the in-phase quadrature-phase plane, and an OFDM modulation signal including the first modulation symbol and the second modulation symbol, wherein the OFDM modulation signal comprises a plurality of subcarriers.
Abstract translation: 发送装置包括OFDM调制器，其通过使用第一调制方式调制第一信息信号来生成第一调制符号，第一调制信息信号的信号点处于同相正交相位平面中的第一位置。 第二调制符号，通过使用第一调制方案调制第二信息信号，并且通过改变调制的第二信息信号的信号点被布置在同相正交相位平面中的第三位置的第二位置，以及 包括第一调制符号和第二调制符号的OFDM调制信号，其中OFDM调制信号包括多个子载波。
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公开(公告)号：US20150156047A1
公开(公告)日：2015-06-04
申请号：US14616482
申请日：2015-02-06
Inventor： Yutaka Murakami , Masayuki Orihashi , Akihiko Matsuoka
CPC classification number: H04L25/0204 , H04B7/0413 , H04B7/06 , H04B7/0626 , H04B7/0632 , H04B7/0671 , H04B7/0689 , H04B7/0697 , H04B7/082 , H04L1/0618 , H04L5/0023 , H04L5/003 , H04L5/0048 , 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：US11469929B2
公开(公告)日：2022-10-11
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 , 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：US20200052851A1
公开(公告)日：2020-02-13
申请号：US16658994
申请日：2019-10-21
Inventor： Yutaka Murakami , Masayuki Orihashi , Akihiko Matsuoka
IPC: H04L5/00 , H04B7/06 , H04W52/52 , H04L27/26 , H04L25/02 , H04L27/18 , H04L29/06 , H04L27/06 , H04L27/14 , H04L27/12 , H04L27/04 , H04L1/06
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：US10305628B2
公开(公告)日：2019-05-28
申请号：US15266319
申请日：2016-09-15
Inventor： Yutaka Murakami , Katsuaki Abe , Masayuki Orihashi , Akihiko Matsuoka
Abstract: A transmission frame generating device generates a transmission frame. The generating device includes a control information signal generator which generates a modulation method control signal indicating a modulation method used for a data signal and an error correction method control signal indicating an error correction method used for the data signal and a frame former which forms the transmission frame by arranging a training signal, the data signal, the modulation method control signal and the error correction method control signal on a plurality of subcarriers on a frequency axis. The modulation method control signal being repeatedly and discretely arranged on a first multiple of the plurality of subcarriers on the frequency axis and the error correction method control signal being repeatedly and discretely arranged on a second multiple of the plurality of the subcarriers on the frequency axis.
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