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公开(公告)号：US20210288721A1
公开(公告)日：2021-09-16
申请号：US16338733
申请日：2017-08-25
Applicant: NEC Corporation
Inventor： Tatsuya NAKAMURA , Junichi ABE
Abstract: A receiving unit (2020) generates a received frame from a modulated optical signal. The modulated optical signal is generated such that a transmission symbol is generated by mapping an encoded bit string obtained by encoding a transmission bit string to an m-dimensional symbol space, a transmission frame is generated by mapping the transmission symbol to an n-dimensional frame space (n
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公开(公告)号：US20210135760A1
公开(公告)日：2021-05-06
申请号：US17148829
申请日：2021-01-14
Applicant: NEC Corporation
Inventor： Junichi ABE , Tatsuya NAKAMURA
IPC: H04B10/516 , H04L27/38 , H04L27/36 , H04B10/25
Abstract: If a configuration is employed in which modulation schemes used for an optical communication system can be switched depending on transmission conditions, the power consumption increases and the control becomes complex; therefore, an optical transmitter according to an exemplary aspect of the present invention includes an encoding means for encoding digital signals to be transmitted under a predetermined transmission condition over an optical carrier wave by using one of a plurality of encoding methods; an encoding control means for selecting a predetermined encoding method corresponding to the predetermined transmission condition from among the plurality of encoding methods and causing the encoding means to operate in accordance with the predetermined encoding method; a mapping means for mapping output bit signals output from the encoding means to modulation symbols; and an optical modulation means for modulating the optical carrier wave based on symbol signals output from the mapping means.
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公开(公告)号：US20190081645A1
公开(公告)日：2019-03-14
申请号：US16084807
申请日：2017-04-14
Applicant: NEC Corporation
Inventor： Tatsuya NAKAMURA , Junichi ABE
Abstract: An optical transmission apparatus (100) generates a second bit sequence B by encoding a first bit sequence b having forward error correction coding performed on a transmission bit sequence, maps the second bit sequence to a transmission symbol signal, and transmits an optical modulated signal generated by modulating an optical carrier wave into the transmission symbol signal. A symbol output unit (2020) generates a received symbol signal by demodulating an optical modulated signal received by an optical reception apparatus (2000). A first computation unit (2040) computes LLR(Bi) which is a log-likelihood ratio (LLR) of each bit Bi of the second bit sequence, using the received symbol signal. A second computation unit (2060) computes a log-likelihood ratio LLR(bi) of each bit bi of the first bit sequence from the LLR(Bi). A correspondence relationship between each bit of the first bit sequence and each bit of the second bit sequence is used in this computation. A decoding unit (2080) decodes the transmission bit sequence using the LLR(bi).
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公开(公告)号：US20240396640A1
公开(公告)日：2024-11-28
申请号：US18796721
申请日：2024-08-07
Applicant: NEC Corporation
Inventor： Daisaku OGASAHARA , Junichi ABE
IPC: H04B10/61 , H04B10/079 , H04L27/26
Abstract: When a frequency deviation compensation amount is compensated for by use of frequency shift, a phase offset occurs between adjacent input blocks included in a plurality of input blocks as divided, with the result that an error occurs in a reconstructed bit sequence. A frequency deviation compensation system of the invention is characterized by comprising: a frequency deviation compensation means for compensating for a frequency deviation occurring in a signal by use of frequency shift; and a phase offset compensation means for compensating for a phase offset occurring, in the signal, due to the frequency shift.
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公开(公告)号：US20230361882A1
公开(公告)日：2023-11-09
申请号：US18351814
申请日：2023-07-13
Applicant: NEC CORPORATION
Inventor： Daisaku OGASAHARA , Junichi ABE
IPC: H04B10/61 , H04L27/26 , H04B10/079
CPC classification number: H04B10/6164 , H04L27/26526 , H04B10/0795 , H04B10/6165
Abstract: When a frequency deviation compensation amount is compensated for by use of frequency shift, a phase offset occurs between adjacent input blocks included in a plurality of input blocks as divided, with the result that an error occurs in a reconstructed bit sequence. A frequency deviation compensation system of the invention is characterized by comprising: a frequency deviation compensation means for compensating for a frequency deviation occurring in a signal by use of frequency shift; and a phase offset compensation means for compensating for a phase offset occurring, in the signal, due to the frequency shift.
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Patent Agency Ranking
公开(公告)号：US20230080973A1
公开(公告)日：2023-03-16
申请号：US17801331
申请日：2020-03-10
Applicant: NEC Corporation
Inventor： Jiro ABE , Akira TSUJI , Junichi ABE , Yoshimasa ONO , Shigeo SUZUKI , Hiroshi MATSUMOTO , Takanori SHIGETA , Taisuke TANABE
IPC: G01B11/24
Abstract: There are provided a data processing apparatus, a data processing system, and a data processing method that can improve convenience of display of point group data. A data processing apparatus (1) includes a point group data processing unit (10) configured to display, when a viewpoint for display of point group data obtained by scanning a display object is input, the point group data viewed from the viewpoint, and an image data processing unit (20) configured to determine image data corresponding to the point group data to be displayed, from a plurality of pieces of image data obtained by imaging the display object from different positions, and to display the determined image data.
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17.发明申请公开(公告)号：US20230080011A1
公开(公告)日：2023-03-16
申请号：US17801325
申请日：2020-03-10
Applicant: NEC Corporation
Inventor： Yoshimasa ONO , Akira TSUJI , Shigeo SUZUKI , Junichi ABE , Jiro ABE
IPC: G06T15/20
Abstract: A display device (10) according to the present disclosure includes: a detection unit (11) that detects, in a three-dimensional space including measurement point group data measured by a three-dimensional optical sensor, intermediate point group data of an intermediate region from a viewpoint for two-dimensionally displaying the measurement point group data to target point group data within the measurement point group data; a setting unit (12) that sets, based on the detected intermediate point group data, a display aspect of the measurement point group data or the target point group data in such a way that the target point group data become visually recognizable from the viewpoint; and a display unit (13) that two-dimensionally displays the measurement point group data and the target point group data according to the set display aspect.
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公开(公告)号：US20220343629A1
公开(公告)日：2022-10-27
申请号：US17641175
申请日：2019-09-20
Applicant: NEC Corporation
Inventor： Yoshimasa ONO , Akira TSUJI , Junichi ABE
IPC: G06V10/764 , G06V10/762
Abstract: A processing device (10) includes a classification means (12) for classifying three-dimensional point cloud data acquired based on reflected light from a plurality of reinforcing steel bars irradiated with light in a bar arrangement inspection into clusters, which are shape units corresponding to the plurality of reinforcing steel bars, based on position information at each point in the three-dimensional point cloud data, a smoothing means (13) for smoothing the contours of the classified clusters, and a cluster association means (14) for determining whether a first cluster and a second cluster contained in the smoothed clusters correspond to the same reinforcing steel bar based on positional relation between the smoothed clusters.
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公开(公告)号：US20210044362A1
公开(公告)日：2021-02-11
申请号：US17077501
申请日：2020-10-22
Applicant: NEC Corporation
Inventor： Daisaku OGASAHARA , Junichi ABE
IPC: H04B10/61 , H04B10/079
Abstract: When a frequency deviation compensation amount is compensated for by use of frequency shift, a phase offset occurs between adjacent input blocks included in a plurality of input blocks as divided, with the result that an error occurs in a reconstructed bit sequence. A frequency deviation compensation system of the invention is characterized by comprising: a frequency deviation compensation means for compensating for a frequency deviation occurring in a signal by use of frequency shift; and a phase offset compensation means for compensating for a phase offset occurring, in the signal, due to the frequency shift.
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公开(公告)号：US20200333460A1
公开(公告)日：2020-10-22
申请号：US16763206
申请日：2018-11-15
Applicant: NEC Corporation
Inventor： Akira TSUJI , Junichi ABE , Hidemi NOGUCHI
Abstract: A distance measurement apparatus comprises a distance measurement optical signal generation part, a collimating part, a beam diameter change part, an emission direction control part, and a beam diameter change control part. The distance measurement optical signal generation part generates an optical signal for measuring the distance to a target. The collimating part collimates the optical signal. The beam diameter change part is able to change a beam diameter of the collimated light. The emission direction control part controls an emission destination of the collimated light with the diameter changed. The beam diameter change control part controls the changing of the beam diameter by the beam diameter change part according to the emission direction of an outgoing.
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