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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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公开(公告)号：US20190165858A1
公开(公告)日：2019-05-30
申请号：US16190905
申请日：2018-11-14
Inventor： Seung-Hyun CHO , Joonyoung KIM , Minkyu SUNG , Jong Hyun LEE
IPC: H04B10/079 , H04B10/29 , H04J14/02 , H04W24/08
Abstract: An optical repeater performs an electrical-to-optical conversion based on a power level of an optical signal or an optical modulation index (OMI) required by a radio unit or a host unit connected to the optical repeater. Further, the optical repeater performs an optical-to-electrical conversion based on a power level of a radio frequency (RF) signal required by the radio unit or the host unit connected to the optical repeater.
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公开(公告)号：US20210336715A1
公开(公告)日：2021-10-28
申请号：US17230143
申请日：2021-04-14
Inventor： Eon-Sang KIM , Joonyoung KIM , Minkyu SUNG , Jong Hyun LEE , Seung-Hyun CHO
Abstract: Provided is an optical transmitting and receiving system. The optical transmitting and receiving system may include: a Main Hub Unit (MHU) configured to perform wavelength division multiplexing on a plurality of downlink signals using a plurality of wavelengths and transmit the multiplexed downlink signal through a first optical cable; a first Remote Optical Unit (ROU) configured to perform demultiplexing on the multiplexed downlink signal received from the MHU and output a part of the plurality of downlink signals; and a second ROU configured to perform demultiplexing on the multiplexed downlink signal and output other part of the plurality of downlink signals.
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公开(公告)号：US20210258778A1
公开(公告)日：2021-08-19
申请号：US17123588
申请日：2020-12-16
Inventor： Joonyoung KIM , Sang Rok MOON , Heuk PARK , Minkyu SUNG , Seung-Hyun CHO
IPC: H04W12/033 , G06N3/04 , G06N3/08 , G06N20/20
Abstract: A secure communication method and an apparatus performing the same are disclosed. The communication method includes receiving a signal encrypted based on at least one attractor and decrypting a security signal received using a neural network trained based on a training signal.
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公开(公告)号：US20190166602A1
公开(公告)日：2019-05-30
申请号：US16190785
申请日：2018-11-14
Inventor： Minkyu SUNG
IPC: H04W72/08 , H04B10/2575 , H04J14/00 , H04W72/04 , H04B10/2507
CPC classification number: H04W72/082 , H04B10/2507 , H04B10/2543 , H04B10/25751 , H04B10/25752 , H04B10/25753 , H04B10/25758 , H04B2210/006 , H04B2210/25 , H04J14/00 , H04W72/0453 , H04W88/085
Abstract: A host device uses an intermediate frequency determined based on frequencies of a second-order nonlinear intermodulation distortion component and a harmonic component which are generated in an analog optical link connected to the host device, for example, an analog optical link of a distributed antenna system (DAS), and precompensates for the second-order nonlinear intermodulation distortion component and the harmonic component generated in the analog optical link.
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Patent Agency Ranking
公开(公告)号：US20220021455A1
公开(公告)日：2022-01-20
申请号：US17374466
申请日：2021-07-13
Inventor： Joonyoung KIM , Eon-sang KIM , Minkyu SUNG , Jong Hyun LEE , Seung-Hyun CHO
IPC: H04B10/2575 , H04B10/50
Abstract: Disclosed is a radio-frequency-over-fiber (RFoF) transmission method using a directly modulated laser (DML). The RFoF transmission method to be performed by a head end includes combining a radio frequency (RF) carrier signal and a data signal having a lower frequency band than the RF carrier signal through an RF coupler, modulating the combined RF carrier signal and the combined data signal using a frequency response characteristic of a DML, and outputting an optical signal in which, of RF carrier signals and data signals being generated in a laterally symmetrical form based on an optical carrier frequency through the modulating, an RF carrier signal is suppressed.
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公开(公告)号：US20180152248A1
公开(公告)日：2018-05-31
申请号：US15792342
申请日：2017-10-24
Inventor： Minkyu SUNG
CPC classification number: H04B10/58 , H04B10/25753 , H04B10/27
Abstract: Provided is a frequency allocation method and a transmission apparatus for performing the method, the frequency allocation method may allocate a center frequency of a first intermediate frequency (IF) carrier of combined IF carriers at a position which is a predetermined interval apart based on direct current (DC) to avoid in view of a non-linear signal distortion component that is generated by an interaction between a chirp and a chromatic dispersion of a laser in a mobile fronthaul.
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公开(公告)号：US20180152245A1
公开(公告)日：2018-05-31
申请号：US15820700
申请日：2017-11-22
Inventor： Minkyu SUNG
IPC: H04B10/2575 , H04W56/00
CPC classification number: H04B10/25758 , H04J15/00 , H04W56/001
Abstract: Structures of a transmission apparatus and a reception apparatus using a mobile fronthaul that transmit and receive a frequency synchronization signal and a management control signal using at least one of in-band signaling and wavelength division multiplexing (WDM) in a single band or multiple bands of a mobile fronthaul using an intermediate frequency-over-fiber (IFoF) based analog transmission scheme.
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公开(公告)号：US20180152244A1
公开(公告)日：2018-05-31
申请号：US15823823
申请日：2017-11-28
Inventor： Seung-Hyun CHO , Hwan Seok CHUNG , Minkyu SUNG , Jong Hyun LEE
IPC: H04B10/2575 , H04J14/02
CPC classification number: H04B10/25753 , H04B1/38 , H04B2210/006 , H04J14/02
Abstract: A host unit is provided between a remote radio head and a radio unit. The host unit performs a conversion between a digital optical signal used by the remote radio head and an analog optical signal used by the radio unit. A frequency of the analog optical signal converted by the host unit may be an intermediate frequency. The radio unit performs a conversion between an analog optical signal used by the host unit and an analog radio signal used by a user terminal. A frequency of the analog radio signal may be included in a millimeter wave band or radio frequency band.
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公开(公告)号：US20230269002A1
公开(公告)日：2023-08-24
申请号：US18106640
申请日：2023-02-07
Inventor： Sang Rok MOON , Eon-sang KIM , Minkyu SUNG , Seung-Hyun CHO
IPC: H04B10/516 , H04B10/079 , H04Q11/00
CPC classification number: H04B10/516 , H04B10/07955 , H04Q11/0005 , H04Q11/0062 , H04Q2011/0009
Abstract: An apparatus and method for maintaining a wavelength interval of light sources are disclosed. The apparatus for maintaining a wavelength interval of light sources includes: a plurality of light sources configured to output light having different wavelengths and having a certain wavelength interval; a light reception unit configured to receive an optical signal in which at least some of the output light of each of the plurality of light sources is combined and output an electrical signal including a frequency component corresponding to the certain wavelength interval; and a controller configured to detect the frequency component corresponding to the certain wavelength interval from the electrical signal and control a wavelength of each of the plurality of light sources to maintain the certain wavelength interval based on the detected frequency component.
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