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公开(公告)号：US10411944B2
公开(公告)日：2019-09-10
申请号：US16079693
申请日：2017-02-27
Inventor： Yutaka Murakami , Tomohiro Kimura , Mikihiro Ouchi
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 s1(i) and second modulated signals s2(i) from transmission data, the plurality of first modulated signals s1(i) being signals generated using a QPSK modulation scheme, and the plurality of second modulated signals s2(i) being signals generated using 16 QAM modulation; generating, from the plurality of first modulated signals s1(i) and the plurality of second modulated signals s2(i), a plurality of first signal-processed signals z1(i) and a plurality of second signal-processed signals z2(i) which satisfy a predetermined equation; and transmitting the plurality of first signal-processed signals z1(i) and the plurality of second signal-processed signals z2(i) using a plurality of antennas. A first signal-processed signal and a second signal-processed signal having identical symbol numbers are simultaneously transmitted at the same frequency.
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公开(公告)号：US10355898B2
公开(公告)日：2019-07-16
申请号：US16155016
申请日：2018-10-09
Inventor： Yutaka Murakami , Tomohiro Kimura , Mikihiro Ouchi
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：US10355710B2
公开(公告)日：2019-07-16
申请号：US15808411
申请日：2017-11-09
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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公开(公告)号：US10333551B2
公开(公告)日：2019-06-25
申请号：US16048949
申请日：2018-07-30
Inventor： Yutaka Murakami
Abstract: An encoding method and encoder of a time-varying LDPC-CC with high error correction performance are provided. In an encoding method of performing low density parity check convolutional coding (LDPC-CC) of a time varying period of q using a parity check polynomial of a coding rate of (n−1)/n (where n is an integer equal to or greater than 2), the time varying period of q is a prime number greater than 3, the method receiving an information sequence as input and encoding the information sequence using Equation 1 as a g-th (g=0, 1, . . . , q−1) parity check polynomial to satisfy 0.
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公开(公告)号：US10263749B2
公开(公告)日：2019-04-16
申请号：US16015053
申请日：2018-06-21
Inventor： Yutaka Murakami , Masayuki Orihashi , Akihiko Matsuoka
IPC: H04L1/02 , H04L5/00 , H04B7/06 , 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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Patent Agency Ranking
公开(公告)号：US10129062B2
公开(公告)日：2018-11-13
申请号：US15963438
申请日：2018-04-26
Inventor： Yutaka Murakami , Tomohiro Kimura , Mikihiro Ouchi
IPC: H04L27/26 , H04B7/06 , H04B7/0413 , H04L1/00
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：US10057096B2
公开(公告)日：2018-08-21
申请号：US15295162
申请日：2016-10-17
Inventor： Yutaka Murakami , Tomohiro Kimura , Mikihiro Ouchi
CPC classification number: H04L27/2601 , H04B7/0413 , H04B7/10 , H04J11/00 , H04L5/0053 , H04L5/0094 , H04L27/2602
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：US09712280B2
公开(公告)日：2017-07-18
申请号：US14487908
申请日：2014-09-16
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 , H04L27/2647 , H04L27/36 , H04L27/38
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：US09491026B2
公开(公告)日：2016-11-08
申请号：US14781455
申请日：2014-04-10
Inventor： Yutaka Murakami , Tomohiro Kimura , Mikihiro Ouchi
CPC classification number: H04L27/0008 , H04L27/34 , H04W28/0263
Abstract: Provided is a transmission method that contributes to an increase in data reception quality when iterative detection is performed at a receive apparatus side. A transmit apparatus alternates between two types of modulation scheme that each shift amplitude and phase, performs mapping to constellation points according to a selected modulation scheme, and transmits a modulated signal obtained by mapping.
Abstract translation: 提供了一种在接收装置侧进行迭代检测时有助于提高数据接收质量的传输方法。 发送装置在每种移动振幅和相位的两种调制方式之间交替，根据选择的调制方案执行到星座点的映射，并且发送通过映射获得的调制信号。
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公开(公告)号：US09479234B2
公开(公告)日：2016-10-25
申请号：US14859737
申请日：2015-09-21
Inventor： Yutaka Murakami , Tomohiro Kimura , Mikihiro Ouchi
CPC classification number: H04L1/0004 , H03M13/255 , H04B7/0413 , H04L1/0003 , H04L1/003 , H04L1/0057 , H04L1/0067 , H04L1/0071 , H04L1/08 , H04L5/005
Abstract: An encoder outputs a first bit sequence having N bits. A mapper generates a first complex signal s1 and a second complex signal s2 with use of bit sequence having X+Y bits included in an input second bit sequence, where X indicates the number of bits used to generate the first complex signal s1, and Y indicates the number of bits used to generate the second complex signal s2. A bit length adjuster is provided after the encoder, and performs bit length adjustment on the first bit sequence such that the second bit sequence has a bit length that is a multiple of X+Y, and outputs the first bit sequence after the bit length adjustment as the second bit sequence. As a result, a problem between a codeword length of a block code and the number of bits necessary to perform mapping by a set of modulation schemes is solved.
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