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公开(公告)号：US11277226B2
公开(公告)日：2022-03-15
申请号：US16859731
申请日：2020-04-27
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：US11050592B2
公开(公告)日：2021-06-29
申请号：US16709360
申请日：2019-12-10
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：US10680752B2
公开(公告)日：2020-06-09
申请号：US15621752
申请日：2017-06-13
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：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：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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Patent Agency Ranking
公开(公告)号：US09847793B2
公开(公告)日：2017-12-19
申请号：US14968350
申请日：2015-12-14
Inventor： Yutaka Murakami , Kiyotaka Kobayashi , Choo Eng Yap
CPC classification number: H03M13/1105 , H03M13/1102 , H03M13/1157 , H03M13/1174 , H03M13/1177 , H03M13/2909 , H04B7/0413 , H04L1/0045 , H04L1/0057 , H04L1/0061 , H04L1/06 , H04L1/1816 , H04L1/1893 , H04L5/0023 , H04L5/0037 , H04L5/0044
Abstract: In a multi-antenna communication system using LDPC codes, a simple method is used to effectively improve the received quality by performing a retransmittal of less data without restricting applicable LDPC codes. In a case of a non-retransmittal, a multi-antenna transmitting apparatus transmits, from two antennas, LDPC encoded data formed by LDPC encoding blocks. In a case of a retransmittal, the multi-antenna transmitting apparatus uses a transmission method, in which the diversity gain is higher than in the previous transmission, to transmit only a part of the LDPC encoded data as previously transmitted. For example, the only the part of the LDPC encoded data to be re-transmitted is transmitted from the single antenna.
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公开(公告)号：US09160491B2
公开(公告)日：2015-10-13
申请号：US14094420
申请日：2013-12-02
Inventor： Yutaka Murakami , Kiyotaka Kobayashi , Masayuki Orihashi , Akihiko Matsuoka
IPC: H04L27/06 , H04L1/06 , H04N19/39 , H04L1/00 , H04L25/06 , H04L27/34 , H04L27/38 , H04B7/04 , H04B7/08 , H04L25/03
CPC classification number: H04L1/06 , H04B7/0413 , H04B7/0854 , H04L1/0054 , H04L1/006 , H04L1/007 , H04L25/03305 , H04L25/03324 , H04L25/03891 , H04L25/061 , H04L27/3488 , H04L27/38 , H04L2025/03611 , H04N19/39
Abstract: A transmitting apparatus and method transmits different modulated signals from a plurality of antennas, and employs a configuration that includes a modulation section that obtains a modulated signal by performing signal point mapping of transmit bits using a signal point arrangement that is divided into a plurality of signal point sets on the IQ plane, whereby the minimum distance between signal points within a signal point set is smaller than the minimum signal point distance between signal point sets; and an antenna that transmits a modulated signal obtained by the modulation section. A signal point generating apparatus generates a first and second symbols to be transmitted by first and second antennas, respectively.
Abstract translation: 一种发送装置和方法从多个天线发送不同的调制信号，并且采用包括通过使用信号点布置来执行发送比特的信号点映射来获得调制信号的调制部分的配置，该信号点布置被划分为多个信号 在IQ平面上的点集合，由此信号点集合内的信号点之间的最小距离小于信号点集之间的最小信号点距离; 以及发送由调制部获得的调制信号的天线。 信号点生成装置生成分别由第一和第二天线发送的第一和第二符号。
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18.发明申请公开(公告)号：US20140307828A1
公开(公告)日：2014-10-16
申请号：US14314420
申请日：2014-06-25
Inventor： Yutaka MURAKAMI , Kiyotaka Kobayashi , Masayuki Orihashi , Akihiko Matsuoka
IPC: H04B7/04
CPC classification number: H04B7/0413 , H04B7/0608 , H04B7/0613 , H04B7/0689 , H04B7/0697 , H04L1/06
Abstract: Of any one of a transmission method X of transmitting modulated signal A and modulated signal B including the same data from a plurality of antennas and a transmission method Y of transmitting modulated signal A and modulated signal B having different data from the plurality of antennas, a base station apparatus does not change the transmission method during data transmission and changes only the modulation scheme. The base station apparatus transmits modulated signal A and modulated signal B to a communication terminal apparatus using the determined transmission method and modulation scheme. In this way, it is possible to improve data transmission efficiency when transmitting data using the plurality of antennas.
Abstract translation: 从多个天线发送调制信号A和包含相同数据的调制信号B的发送方法X和从多个天线发送具有不同数据的调制信号A和调制信号B的发送方式Y中的任一种， 基站装置在数据发送期间不改变发送方式，只改变调制方式。 基站装置使用所确定的发送方法和调制方式向调制信号A和调制信号B发送到通信终端装置。 以这种方式，可以在使用多个天线发送数据时提高数据传输效率。
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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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