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公开(公告)号：US20210067174A1
公开(公告)日：2021-03-04
申请号：US17098648
申请日：2020-11-16
发明人： Kazuo Kubo , Hideo Yoshida
摘要： A transmitter according to the disclosure includes: an encoding unit that generates a code word by performing coding with a low-density parity-check code using a check matrix, the encoding unit being capable of switching the check matrix for use in generating the code word, between a first check matrix with a first code rate and a second check matrix with a second code rate smaller than the first code rate, the first check matrix containing a plurality of cyclic permutation matrices, the encoding unit generating the second check matrix by masking the cyclic permutation matrix at a predetermined position in the first check matrix and adding a row with a column weight equal to or less than a threshold; and a transmission unit that transmits the code word.
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公开(公告)号：US09813280B2
公开(公告)日：2017-11-07
申请号：US15112652
申请日：2015-02-16
摘要： A likelihood generation apparatus for acquiring a likelihood of a 16QAM signal includes a first likelihood generation unit configured to generate a likelihood of each of two bits of a 16QAM signal point of the 16QAM signal from a relationship of each of an I-axis component and a Q-axis component with a likelihood when the 16QAM signal point is mapped on a constellation diagram, and a second likelihood generation unit configured to generate a likelihood of each of remaining two bits other than the two bits of the 16QAM signal point of the 16QAM signal based on a position of the 16QAM signal point in a lookup table, which is configured to input the I-axis component and the Q-axis component of the 16QAM signal point as arguments, and includes regions acquired by dividing the constellation diagram based on a possible value of each of the bits.
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公开(公告)号：US09621291B2
公开(公告)日：2017-04-11
申请号：US14787663
申请日：2013-06-18
CPC分类号： H04J3/1652 , H04J3/0691 , H04J2203/0007
摘要： Provided is an optical communication cross-connection device for exchanging an OTN signal through optical communications, including: a plurality of OTN signal processing units (OTNsp units) for asynchronously conducting OTN signal processing; and a space switch connected between the plurality of OTNsp units, for conducting bidirectional signal exchange for the OTN signal, in which a first and a second OTNsp units that conduct signal transmission among the plurality of OTNsp units subject the OTN signal to skew processing on one side and deskew processing corresponding to the skew processing on another side between the first and second OTNsp units or between a communicating end-side one of the first and second OTNsp units and a communicating end-side OTNsp unit of an optical communication cross-connection device of a communication counterpart destination for the optical communication cross-connection device, and share a clock for the signal transmission therebetween.
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公开(公告)号：US09780897B2
公开(公告)日：2017-10-03
申请号：US15115823
申请日：2015-01-13
发明人： Yoshiaki Konishi , Kazuo Kubo
CPC分类号： H04J3/1652 , H04J3/0691 , H04J3/07 , H04L7/0075
摘要： An optical transmission apparatus that accommodates client signals in a line signal, includes: an OPUn mapper unit that receives and maps the client signals; and a mapping control unit that determines the number of pieces of client data to be mapped to a payload portion and determines the timing to insert client data and information on the number of pieces of client data into the payload portion to control mapping performed in the OPUn mapper unit.
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公开(公告)号：US09564974B2
公开(公告)日：2017-02-07
申请号：US14766852
申请日：2014-02-20
发明人： Yoshiaki Konishi , Kazuo Kubo
IPC分类号： H04B10/40 , H04B10/516 , H04B10/556 , H04B10/25 , H04L27/34 , H04J3/16 , H04B10/61 , H04J14/06 , H04L1/00 , H04L27/36
CPC分类号： H04B10/40 , H04B10/25 , H04B10/5161 , H04B10/5561 , H04B10/612 , H04J3/1652 , H04J14/06 , H04J2203/006 , H04J2203/0089 , H04L1/0042 , H04L27/34 , H04L27/362
摘要： An optical transmission device for transmitting and receiving a multilevel-modulated optical signal includes a plurality of transmission frame processors for generating transmission frame signals accommodating a plurality of client signals that are each subjected to error correction processing and scrambling/descrambling processing, and a digital modulator/demodulator for mapping the transmission frame signals that are input to and output from the plurality of transmission frame processors to a multilevel signal. The digital modulator/demodulator performs digital modulation/demodulation, in which the plurality of transmission frame processors each have a function of shifting a phase of a pattern between a plurality of transmission frames to be mapped to a multilevel signal and to be digitally modulated/demodulated.
摘要翻译： 用于发送和接收多级调制光信号的光传输装置包括多个传输帧处理器，用于产生容纳多个客户端信号的传输帧信号，每个客户端信号经过纠错处理和加扰/解扰处理，数字调制器 解调器，用于将输入到多个发送帧处理器的输出帧信号和从多个发送帧处理器输出的发送帧信号映射到多电平信号。 数字调制器/解调器执行数字调制/解调，其中多个传输帧处理器各自具有将要映射到多电平信号的多个传输帧之间的模式相位移位并被数字调制/解调的功能 。
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公开(公告)号：US11133824B2
公开(公告)日：2021-09-28
申请号：US16756334
申请日：2017-11-27
发明人： Kazuo Kubo
摘要： Provided is an optical transmission/reception device including: an error correction encoding unit configured to encode a sequence to be transmitted with one type of LDPC code; and an error correction decoding unit configured to decode a received sequence encoded with the LDPC code. The error correction decoding unit performs decoding processing for the received sequence based on a check matrix of an LDPC convolutional code. The decoding processing is windowed decoding processing, which is performed by using a window extending over one or more check submatrices. A window size of the window and a decoding iteration count are configured to be variable, and the window size and the decoding iteration count are input from a control circuit connected to the error correction decoding unit.
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公开(公告)号：US11095309B2
公开(公告)日：2021-08-17
申请号：US16321793
申请日：2017-02-02
发明人： Kenji Ishii , Kazuo Kubo , Kenya Sugihara , Hideo Yoshida
摘要： Provided is an optical transmission/reception device including an error correction decoding unit (36) for decoding a received sequence encoded with an LDPC code, in which the error correction decoding unit (36) is configured to perform decoding processing using a parity check matrix (70) of a spatially-coupled LDPC code, which includes a plurality of parity check sub-matrices (71) combined with each other, in which the decoding processing is windowed decoding processing that uses a window (80) over one or more parity check sub-matrices (71), and in which a window size of the window (80) and a decoding iteration count due to throughput and requested correction performance are variable and input from a control circuit (12) connected to the error correction decoding device (36).
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公开(公告)号：US10128940B2
公开(公告)日：2018-11-13
申请号：US15302382
申请日：2015-04-16
发明人： Hiroki Goto , Tsuyoshi Yoshida , Kiyoshi Onohara , Takashi Sugihara , Kazuo Kubo , Tatsuya Kobayashi , Keisuke Matsuda , Masashi Binkai
IPC分类号： H04B10/079 , H04B10/075 , H04B10/2543 , H04B10/50 , H04J14/02 , H04J14/06
摘要： An optical transmission method wavelength-multiplexing and transmitting multiple channels including data. The data are composed of data areas independent between the channels and data areas non-independent between the channels. Data patterns of the data areas non-independent between the channels are variable. The data patterns of the data areas non-independent between the channels are set so that in time periods of the non-independent data areas on an optical transmission section, a time period during which polarization states of the multiple channels are correlated in the optical transmission section has a length such that an error rate is less than or equal to a threshold value, the error rate being determined from a temporal distribution of bit errors obtained from a result of error decision after demodulation in an optical receiver.
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公开(公告)号：US10057149B2
公开(公告)日：2018-08-21
申请号：US15500673
申请日：2015-09-15
发明人： Yuta Takemoto , Kazuo Kubo , Yoshiaki Konishi
CPC分类号： H04L43/0864 , H04L12/28 , H04L69/40 , H04L2212/00 , H04Q11/0066 , H04Q2011/0083
摘要： A delay measuring device of a communication system that includes the delay measuring device sequentially transmitting and receiving frames having a known frame length, and a measurement object device serving as an object for measuring a round trip time by the delay measuring device, includes: an RTT measuring unit to measure a round trip time with respect to the measurement object device a number of times using information for delay measurement in the frame; an RTT change detection unit to detect a change of a value of the round trip time based on the values of the round trip time thus measured; and an RTT determination unit to determine a value of the round trip time to be adopted, from among the values of the round trip time, based on the change of a value of the round trip time.
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公开(公告)号：US11349497B2
公开(公告)日：2022-05-31
申请号：US17098648
申请日：2020-11-16
发明人： Kazuo Kubo , Hideo Yoshida
摘要： A transmitter according to the disclosure includes: an encoding unit that generates a code word by performing coding with a low-density parity-check code using a check matrix, the encoding unit being capable of switching the check matrix for use in generating the code word, between a first check matrix with a first code rate and a second check matrix with a second code rate smaller than the first code rate, the first check matrix containing a plurality of cyclic permutation matrices, the encoding unit generating the second check matrix by masking the cyclic permutation matrix at a predetermined position in the first check matrix and adding a row with a column weight equal to or less than a threshold; and a transmission unit that transmits the code word.
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