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公开(公告)号：US20220247439A1
公开(公告)日：2022-08-04
申请号：US17514849
申请日：2021-10-29
Inventor： Sang Rok MOON , Minkyu SUNG , Eon-sang KIM , Won Kyoung LEE , Seung-Hyun CHO
Abstract: Disclosed is a method and apparatus for phase error compensation having tolerance to a cyclic slip. The method includes determining first phase error candidates based on symbol phases of a first block of a received signal, determining an initial estimation error according to the first phase error candidates, determining second phase error candidates based on symbol phases of a second block of the received signal, determining a final estimation error according to the initial estimation error and the second phase error candidates, and compensating for a phase of the received signal according to the final estimation error.
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12.发明申请公开(公告)号：US20170373787A1
公开(公告)日：2017-12-28
申请号：US15471064
申请日：2017-03-28
Inventor： Sang Rok MOON , Changyo HAN
IPC: H04J14/04 , H04B10/079
CPC classification number: H04J14/04 , H04B10/0793 , H04B10/0795
Abstract: A mode-multiplexing control method, and a transmission apparatus and reception apparatus for the same, the mode-multiplexing control method performed by the transmission apparatus, the mode-multiplexing control method including measuring data traffic, determining a transmission mode count to be used based on the measured data traffic, and transmitting data to a reception apparatus through an optical line in transmission modes corresponding to the determined transmission mode count.
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公开(公告)号：US20230308318A1
公开(公告)日：2023-09-28
申请号：US18126137
申请日：2023-03-24
Inventor： Seung-Woo LEE , Sang Rok MOON , Joon Ki LEE
IPC: H04L25/03 , H04L25/497
CPC classification number: H04L25/03343 , H04L25/497 , H04L25/03025 , H04L2025/0349
Abstract: A method of equalization for high-speed processing and an equalizer thereof are proposed. The method of equalization includes determining a filter coefficient applied to a transmitter equalizer provided with a 2-tap precoder according to an approximate channel response characteristic, generating a pre-equalization signal by removing precursor ISI of a transmission feedback signal by the precoder to which the filter coefficient is applied, so as to output the pre-equalization signal as a transmitting signal, and receiving a transmission signal and generating an equalization signal by removing postcursor ISI of the received transmission signal by a receiver equalizer provided with a feedback filter having auxiliary coefficients for compensating for a difference between an overall channel response of the transmission signal and a channel response based on the precoder.
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Patent Agency Ranking
公开(公告)号：US20210270732A1
公开(公告)日：2021-09-02
申请号：US17131063
申请日：2020-12-22
Inventor： Sun Hyok CHANG , Sang Rok MOON
IPC: G01N21/3586 , G02F1/39 , G01N21/39
Abstract: A method of generating a terahertz wave and apparatuses performing the method are disclosed. According to an example embodiment, a method of generating a terahertz wave includes outputting a laser comb by modulating a laser output from a laser source based on a linearly modulated frequency of an output that is output from a frequency source, and generating a terahertz wave based on a first comb line and a second comb line selected from the laser comb.
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公开(公告)号：US20210152251A1
公开(公告)日：2021-05-20
申请号：US17097212
申请日：2020-11-13
Inventor： Sang Rok MOON , Joonyoung KIM , Sun Hyok CHANG
IPC: H04B10/50 , H04B10/572 , H01S3/30 , H01S3/067
Abstract: A wireless signal transmitter and a wireless signal receiver are provided. The wireless signal transmitter includes an optical signal generation region that generates excitation light by beating two optical signals that have different wavelengths and that are output through different laser diodes, and a wireless signal generation region that modulates the excitation light output from the optical signal generation region into a wireless signal with a carrier frequency of a terahertz band, using a photomixer. The optical signal generation region and the wireless signal generation region may be connected by a multimode optical fiber to reduce a nonlinear effect occurring in an optical fiber. Also, the wireless signal receiver includes a signal processor, for example, an equalizer, for compensating for a modal dispersion, and may compensate for a modal dispersion caused by the multimode optical fiber used in the wireless signal transmitter.
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公开(公告)号：US20200169273A1
公开(公告)日：2020-05-28
申请号：US16553445
申请日：2019-08-28
Inventor： Sang Rok MOON , Hun Sik KANG
Abstract: A method and apparatus for estimating a burst error. A burst error estimation method includes measuring a frequency of a spectrum null for an optical signal received through an optical receiver; determining whether the measured frequency of the spectrum null corresponds to an intermediate frequency of a baud rate; and estimating that a burst error occurrence condition is met when the frequency of the spectrum null is determined to correspond to the intermediate frequency of the baud rate.
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17.发明申请公开(公告)号：US20190319708A1
公开(公告)日：2019-10-17
申请号：US16207287
申请日：2018-12-03
Inventor： Hun Sik KANG , Sang Rok MOON , Seung-Woo LEE , Sun Hyok CHANG , In Ki HWANG
IPC: H04B10/2513 , H04B10/54 , H04B10/079
Abstract: A method and apparatus for compensation of a chromatic dispersion through an optical compensation and an electronical compensation in optical communication. An optical communication method receives an optical signal, estimates a first transmission length based on a null component included in a frequency spectrum of the optical signal, optically compensates for a chromatic dispersion of the optical signal based on the first transmission length, estimates a second transmission length based on a null component included in a frequency spectrum of the compensated optical signal, and electronically compensates for a residual chromatic dispersion of the compensated optical signal based on the second transmission length.
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公开(公告)号：US20190222352A1
公开(公告)日：2019-07-18
申请号：US16112628
申请日：2018-08-24
Inventor： Sang Rok MOON , Hun Sik KANG
CPC classification number: H04L1/0047 , G06N20/00 , H03M13/3927 , H04B10/50 , H04B10/67 , H04L1/0076
Abstract: Disclosed is an optical receiver and an error correction method performed by the optical receiver, receiving, using a receiving antenna or a photodetector, a training signal in which an error occurs due to noise and distortion while being output from an optical transmitter and transmitted through a communication channel and identifying a hyperplane for classifying a probability that the received training signal is a training signal corresponding to a training signal output from the optical signal using a support vector machine (SVM) and learning a parameter of the identified hyperplane such that a classification error probability is minimized when the probability is extracted using the identified hyperplane, wherein the parameter of the identified hyperplane is used to correct an error occurring while a transmission signal output from the optical signal is received using the receiving antenna or the photodetector.
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