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公开(公告)号：US12177047B2
公开(公告)日：2024-12-24
申请号：US18111275
申请日：2023-02-17
Inventor： Won Kyoung Lee , Sang Rok Moon , Joon Ki Lee , Seung-Hyun Cho
Abstract: A method and apparatus for compensating an in- and quadrature-(IQ) imbalance are disclosed. The method and apparatus for compensating an in- and quadrature-(IQ) imbalance provide a technique for compensating a signal distortion caused by imperfect element features and various noises on a transmission link in terahertz wireless communication and improving transmission performance.
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公开(公告)号：US11949453B2
公开(公告)日：2024-04-02
申请号：US17846604
申请日：2022-06-22
Inventor： Seung-Hyun Cho , Joon Ki Lee
IPC: H04B10/07 , H04B10/077 , H04B10/2575
CPC classification number: H04B10/2575 , H04B10/077 , H04B10/07
Abstract: A test device and method for testing a distributed feedback laser diode (DFB-LD) device for an optical transceiver of a radio over fiber (RoF) system examines the DFB-LD device based on an absolute limiting rating, an operating case environment, and a functional specification, in which the absolute limiting rating is a rating at which there is no fatal damage to the DFB-LD device during a short period of time when each limiting parameter is isolated and all other parameters are in a normal performance parameter, the operating case environment includes an operating temperature, and the functional specification includes parameters to be tested according to an operating condition for the functional specification.
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公开(公告)号：US11799553B2
公开(公告)日：2023-10-24
申请号：US17695346
申请日：2022-03-15
Inventor： Eon-Sang Kim , Sang Rok Moon , Minkyu Sung , Seung-Hyun Cho
IPC: H04B10/50 , H04B10/079 , H04B10/69
CPC classification number: H04B10/504 , H04B10/0797 , H04B10/6911
Abstract: Provided are an apparatus and method of generating a terahertz (THz) signal using a directly-modulated laser. An apparatus of generating a THz signal includes a first directly-modulated laser configured to output a local oscillator (LO) signal, a second directly-modulated laser configured to receive a baseband signal used as data and optically modulate the baseband signal, a band-pass filter configured to filter a spectral component of the baseband signal optically modulated and outputted through the second directly-modulated laser by using a specific frequency bandwidth, a coupler configured to couple the baseband signal filtered through the band-pass filter and the LO signal to each other, and a uni-travelling-carrier photodiode (UTC-PD) configured to generate a THz signal by beating the baseband signal and the LO signal coupled to each other.
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公开(公告)号：US20220166977A1
公开(公告)日：2022-05-26
申请号：US17667141
申请日：2022-02-08
Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE , INDUSTRY-UNIVERSITY COOPERATION FOUNDATION KOREA AEROSPACE UNIVERSITY , HANBAT NATIONAL UNIVERSITY INDUSTRY-ACADEMIC COOPERATION FOUNDATION
Inventor： Jin-Ho Lee , Jung-Won Kang , Hyunsuk Ko , Sung-Chang Lim , Dong-San Jun , Ha-Hyun Lee , Seung-Hyun Cho , Hui-Yong Kim , Hae-Chul Choi , Dae-Hyeok Gwon , Jae-Gon Kim , A-Ram Back
IPC: H04N19/119 , H04N19/105 , H04N19/124 , H04N19/61 , H04N19/593
Abstract: Disclosed herein are a video decoding method and apparatus and a video encoding method and apparatus. In video encoding and decoding, multiple partition blocks are generated by splitting a target block. A prediction mode is derived for at least a part of the multiple partition blocks, among the multiple partition blocks, and prediction is performed on the multiple partition blocks based on the derived prediction mode. When prediction is performed on the partition blocks, information related to the target block may be used, and information related to an additional partition block, which is predicted prior to the partition block, may be used.
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公开(公告)号：US11205257B2
公开(公告)日：2021-12-21
申请号：US16697585
申请日：2019-11-27
Inventor： Se-Yoon Jeong , Dae-Yeol Lee , Seung-Hyun Cho , Hyunsuk Ko , Youn-Hee Kim , Jong-Ho Kim , Jin-Wuk Seok , Joo-Young Lee , Woong Lim , Hui-Yong Kim , Jin-Soo Choi
Abstract: Disclosed herein are a method and apparatus for measuring video quality based on a perceptually sensitive region. The quality of video may be measured based on a perceptually sensitive region and a change in the perceptually sensitive region. The perceptually sensitive region includes a spatial perceptually sensitive region, a temporal perceptually sensitive region, and a spatio-temporal perceptually sensitive region. Perceptual weights are applied to a detected perceptually sensitive region and a change in the detected perceptually sensitive region. Distortion is calculated based on the perceptually sensitive region and the change in the perceptually sensitive region, and a result of quality measurement for a video is generated based on the calculated distortion.
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Patent Agency Ranking
公开(公告)号：US10827173B2
公开(公告)日：2020-11-03
申请号：US16188587
申请日：2018-11-13
Inventor： Woong Lim , Seung-Hyun Cho , Joo-Young Lee , Youn-Hee Kim , Jin-Wuk Seok , Jong-Ho Kim , Dae-Yeol Lee , Se-Yoon Jeong , Hui-Yong Kim , Jin-Soo Choi
IPC: H04N19/124 , H04N19/70
Abstract: Disclosed herein are a video decoding method and apparatus and a video encoding method and apparatus. In quantization and dequantization, multiple quantization methods and multiple dequantization methods may be used. The multiple quantization methods include a variable-rate step quantization method and a fixed-rate step quantization method. The variable-rate step quantization method may be a quantization method in which an increment in a quantization step depending on an increase in a value of a quantization parameter by 1 is not fixed. The fixed-rate step quantization method may be a quantization method in which the increment in the quantization step depending on the increase of the value of the quantization parameter by 1 is fixed.
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公开(公告)号：US10110309B2
公开(公告)日：2018-10-23
申请号：US15823823
申请日：2017-11-28
Inventor： Seung-Hyun Cho , Hwan Seok Chung , Minkyu Sung , Jong Hyun Lee
IPC: H03M1/66 , H04B10/2575 , H04J14/02 , H04B1/38
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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18.发明授权公开(公告)号：US10020890B2
公开(公告)日：2018-07-10
申请号：US15640687
申请日：2017-07-03
Inventor： Seung-Hyun Cho , Hwan Seok Chung , Minkyu Sung , Jong Hyun Lee
CPC classification number: H04B10/40 , H04B7/04 , H04B10/25759 , H04L5/14 , H04L5/1469 , H04L7/0075
Abstract: A remote radio head disposed between a baseband unit and a host unit. The remote radio head may transmit and receive a digital optical signal to the baseband unit, transmit and receive an analog optical signal to the host unit, and convert the digital optical signal and the analog optical signal, a frequency of the analog optical signal transmitted and received by the remote radio head and the host unit may be an intermediate frequency of a baseband, the host unit may be disposed between the remote radio head and a radio unit, the host unit and the radio unit may transmit and receive the analog optical signal, and the frequency of the analog optical signal transmitted and received by the host unit and the radio unit may be the intermediate frequency with a baseband signal.
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公开(公告)号：US12176950B2
公开(公告)日：2024-12-24
申请号：US18389942
申请日：2023-12-20
Inventor： Seung-Hyun Cho , Joon Ki Lee
IPC: H04B10/07 , H04B10/077 , H04B10/2575
Abstract: A test device and method for testing a distributed feedback laser diode (DFB-LD) device for an optical transceiver of a radio over fiber (RoF) system examines the DFB-LD device based on an absolute limiting rating, an operating case environment, and a functional specification, in which the absolute limiting rating is a rating at which there is no fatal damage to the DFB-LD device during a short period of time when each limiting parameter is isolated and all other parameters are in a normal performance parameter, the operating case environment includes an operating temperature, and the functional specification includes parameters to be tested according to an operating condition for the functional specification.
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公开(公告)号：US11996890B2
公开(公告)日：2024-05-28
申请号：US17845190
申请日：2022-06-21
Inventor： Seung-Hyun Cho , Joon Ki Lee
IPC: H04B10/2575 , H04L7/04 , H04W88/08
CPC classification number: H04B10/25753 , H04L7/04 , H04W88/085
Abstract: Provided is a radio over fiber (RoF)-based distributed antenna system (DAS) structure that cost-effectively provides a fifth generation (5G) mobile communication service guaranteeing a quality of service (QoS) with high bandwidth and low latency characteristics without radio shadowing in an indoor environment.
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