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公开(公告)号：US10075184B2
公开(公告)日：2018-09-11
申请号：US15132971
申请日：2016-04-19
Inventor： Yutaka Murakami
CPC classification number: H03M13/1154 , H03M13/1105 , H03M13/1111 , H03M13/13 , H03M13/157 , H04L1/0041 , H04L1/0057
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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32.发明申请公开(公告)号：US20170366200A1
公开(公告)日：2017-12-21
申请号：US15692679
申请日：2017-08-31
Inventor： Yutaka Murakami , Shutai Okamura
CPC classification number: H03M13/116 , H03M13/005 , H03M13/1125 , H03M13/15 , H03M13/616 , H03M13/6362 , H03M13/6527 , H04L1/0041
Abstract: Disclosed are an encoder, a transmitting device, a coding method and a transmission method with which the transmission amount is reduced and a deterioration in transmission efficiency is suppressed while improving reception quality when QC-LDPC or a like block coding is used. A puncture pattern setting unit searches for a puncture pattern for each integral multiple of the number of columns or for each divisor of the number of columns of a sub block matrix that forms a check matrix (H) of a QC-LDPC code, and a puncture unit (data reduction unit) switches the puncture pattern for each integral multiple of the number of columns or for each divisor of the number of columns of the sub block matrix that forms the check matrix of the QC-LDPC code.
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公开(公告)号：US09628222B2
公开(公告)日：2017-04-18
申请号：US15046939
申请日：2016-02-18
Inventor： Yutaka Murakami
CPC classification number: H04L1/08 , G06F11/10 , H04L1/0041 , H04L1/0057 , H04L1/0061 , H04L1/0068 , H04L1/0071 , H04L1/1607 , H04L1/1819 , H04L1/1825 , H04L1/1845 , H04L1/1887 , H04L2001/0093 , H04L2001/0097
Abstract: Provided is a transmission method executed by a transmitting apparatus to transmit a content to a plurality of terminals. The content having transmission count information indicating a number of times the content is to be transmitted by the transmitting apparatus. The transmission method including a first transmission step of generating and transmitting a first transmission signal which transfers at least a first portion of a plurality of data packets including a plurality of content packets, storing data of the content therein, and a plurality of parity packets, generated from the content packets, and a second transmission step of, when the transmission count information of the content indicates a plurality of times, generating a second transmission signal including at least a second portion of the plurality of data packets, and transmitting the second transmission signal during a period which differs from a period during which the first transmission signal is transmitted.
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公开(公告)号：US09479235B2
公开(公告)日：2016-10-25
申请号：US14860018
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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公开(公告)号：US09362996B2
公开(公告)日：2016-06-07
申请号：US14454314
申请日：2014-08-07
Inventor： Yutaka Murakami , Tomohiro Kimura , Mikihiro Ouchi
CPC classification number: H04B7/0456 , H04B7/0413 , H04B7/0615 , H04J11/0033 , H04L1/0003 , H04L1/0071 , H04L1/0625 , H04L1/0631 , H04L1/0643 , H04L5/0007 , H04L25/03343 , H04L25/03891 , H04L27/2602 , H04L27/2647 , H04L27/3444 , H04L27/368
Abstract: Disclosed is a transmission scheme for transmitting a first modulated signal and a second modulated signal over the same frequency at the same time. According to the transmission scheme, a precoding weight multiplying unit multiplies a baseband signal after a first mapping and a baseband signal after a second mapping by a precoding weight and outputs the first modulated signal and the second modulated signal. In the precoding weight multiplying unit, precoding weights are regularly hopped.
Abstract translation: 公开了一种用于在相同频率上同时发送第一调制信号和第二调制信号的传输方案。 根据传输方案，预编码权重乘法单元在第一映射之后将基带信号与经过预编码权重的第二映射之后的基带信号相乘，并输出第一调制信号和第二调制信号。 在预编码权重乘法单元中，规则地跳跃预编码权重。
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Patent Agency Ranking
公开(公告)号：US09362989B2
公开(公告)日：2016-06-07
申请号：US14402115
申请日：2013-05-21
Inventor： Yutaka Murakami , Tomohiro Kimura , Mikihiro Ouchi
IPC: H04L27/00 , H03K9/00 , H03C3/00 , H04B7/04 , H04B7/06 , H04B7/08 , H04B7/10 , H04J11/00 , H04B7/02
CPC classification number: H04L5/0032 , H04B7/022 , H04B7/024 , H04B7/04 , H04B7/0413 , H04B7/0456 , H04B7/0469 , H04B7/0615 , H04B7/0619 , H04B7/0848 , H04B7/086 , H04B7/0891 , H04B7/10 , H04J11/00 , H04L5/005 , H04L12/1868 , H04W72/005 , H04W72/08
Abstract: When transmitting signals from a plurality of base stations (broadcasting stations), the base stations include at least a first base station having a first antenna with a first polarization and a second base station having a second antenna with a second polarization that is different from the first polarization. Then, when the first base station transmits a signal from the first antenna having the first polarization, the second base station transmits the same signal as the first antenna of the first base station from a second antenna having the second polarization, at the same time.
Abstract translation: 当从多个基站（广播站）发送信号时，基站至少包括具有第一极化的第一天线的第一基站和具有第二天线的第二基站，第二天线具有与 第一极化。 然后，当第一基站从具有第一极化的第一天线发送信号时，第二基站同时从具有第二极化的第二天线发送与第一基站的第一天线相同的信号。
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公开(公告)号：US09350387B2
公开(公告)日：2016-05-24
申请号：US14597810
申请日：2015-01-15
Inventor： Yutaka Murakami
CPC classification number: H03M13/1154 , H03M13/1105 , H03M13/1111 , H03M13/13 , H03M13/157 , H04L1/0041 , H04L1/0057
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.
Abstract translation: 提供了具有高纠错性能的时变LDPC-CC的编码方法和编码器。 在使用编码率为（n-1）/ n的奇偶校验多项式（其中n为等于或等于的整数）的奇偶校验多项式的q时变周期的低密度奇偶校验卷积编码（LDPC-CC）的编码方法中， 大于2），q的时变周期是大于3的质数，该方法接收信息序列作为输入，并且使用等式1将信息序列编码为第g（g = 0,1，...）。 ，q-1）奇偶校验多项式满足0。
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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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公开(公告)号：US09225407B2
公开(公告)日：2015-12-29
申请号：US14582652
申请日：2014-12-24
Inventor： Yutaka Murakami , Tomohiro Kimura , Mikihiro Ouchi
CPC classification number: H04B7/0456 , H04B7/0413 , H04B7/0469 , H04B7/0617 , H04L25/03171 , H04L25/03942 , H04L25/03949 , H04L27/18 , H04L27/2626 , H04L27/34
Abstract: Disclosed is a precoding method for generating, from a plurality of baseband signals, a plurality of precoded signals that are transmitted in the same frequency bandwidth at the same time. According to the precoding method, one matrix is selected from among matrices defining a precoding process that is performed on the plurality of baseband signals by hopping between the matrices. A first baseband signal and a second baseband signal relating to a first coded block and a second coded block generated by using a predetermined error correction block coding scheme satisfy a given condition.
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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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