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公开(公告)号：US20240113810A1
公开(公告)日：2024-04-04
申请号：US18532791
申请日：2023-12-07
Inventor： Yutaka MURAKAMI , Shutai OKAMURA , Kiyotaka KOBAYASHI , Masayuki ORIHASHI , Kazuaki TAKAHASHI
CPC classification number: H04L1/0071 , H03M13/15 , H04L1/0003 , H04L1/0009 , H04L1/0059 , H04L1/22 , H04L5/0007 , H04L27/0008 , H04L27/36 , H04L27/38 , H04L27/2647
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：US20210184694A1
公开(公告)日：2021-06-17
申请号：US17150766
申请日：2021-01-15
Inventor： Yutaka MURAKAMI , Kiyotaka KOBAYASHI , Choo Eng YAP
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 (100) transmits, from two antennas (114A,114B), LDPC encoded data formed by LDPC encoding blocks (102A,102B). In a case of a retransmittal, the multi-antenna transmitting apparatus (100) 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 (114A).
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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：US20200266930A1
公开(公告)日：2020-08-20
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：US20190280713A1
公开(公告)日：2019-09-12
申请号：US16421624
申请日：2019-05-24
Inventor： Yutaka MURAKAMI , Kiyotaka KOBAYASHI , Choo Eng YAP
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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Patent Agency Ranking
公开(公告)号：US20180145792A1
公开(公告)日：2018-05-24
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：US20170126446A1
公开(公告)日：2017-05-04
申请号：US15404910
申请日：2017-01-12
Inventor： Yutaka Murakami , Kiyotaka KOBAYASHI , Masayuki ORIHASHI , Akihiko MATSUOKA
CPC classification number: H04L27/0008 , H04B7/0413 , H04B7/0417 , H04B7/0669 , H04L1/0006 , H04L1/0026 , H04L1/06 , H04L1/0618 , H04L1/08 , H04L5/0046 , H04L27/3405 , 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：US20180183635A1
公开(公告)日：2018-06-28
申请号：US15902371
申请日：2018-02-22
Inventor： Yutaka MURAKAMI , Kiyotaka KOBAYASHI , Masayuki ORIHASHI , Akihiko MATSUOKA
IPC: H04L27/00 , H04B7/0413 , H04L5/00
CPC classification number: H04L27/0008 , H04B7/0413 , H04B7/0417 , H04B7/0669 , H04L1/0006 , H04L1/0026 , H04L1/06 , H04L1/0618 , H04L1/08 , H04L5/0046 , H04L27/3405 , 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：US20230124557A1
公开(公告)日：2023-04-20
申请号：US18068464
申请日：2022-12-19
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：US20220271774A1
公开(公告)日：2022-08-25
申请号：US17744449
申请日：2022-05-13
Inventor： Yutaka MURAKAMI , Kiyotaka KOBAYASHI , Choo Eng YAP
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 (100) transmits, from two antennas (114A,114B), LDPC encoded data formed by LDPC encoding blocks (102A,102B). In a case of a retransmittal, the multi-antenna transmitting apparatus (100) 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 (114A).
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