公开(公告)号：US10523323B2

公开(公告)日：2019-12-31

申请号：US16207287

申请日：2018-12-03

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Hun Sik Kang ,  Sang Rok Moon ,  Seung-Woo Lee ,  Sun Hyok Chang ,  In Ki Hwang

IPC: H04B10/54 ,  H04B10/2513 ,  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.

公开(公告)号：US11411583B2

公开(公告)日：2022-08-09

申请号：US17199605

申请日：2021-03-12

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Seung-Woo Lee ,  Hun Sik Kang ,  In Ki Hwang

IPC: H03M13/27 ,  H03M13/11

Abstract: A deinterleaving method and a deinterleaving system performing the same are disclosed. According to an example embodiment, a data processing method includes dividing data into first data blocks of a first number of bits, performing deinterleaving on the first data blocks, and dividing deinterleaved data into second data blocks of a second number of bits and outputting the second data blocks, wherein the first number of bits is determined based on a minimum switching unit of a deinterleaving operation and the second number of bits.

公开(公告)号：US10904043B2

公开(公告)日：2021-01-26

申请号：US15931821

申请日：2020-05-14

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Hun Sik Kang ,  Sang Rok Moon ,  Seung Woo Lee ,  In Ki Hwang ,  Sun Hyok Chang

IPC: H04L25/03 ,  H04L1/00 ,  H04L25/02 ,  H04L1/20

Abstract: An optical transmission method for processing a signal based on direct detection includes setting, by an equalizer, an adaptive equalization coefficient by performing an equalization process during a training symbol field section in a frame of a received signal, performing, by a channel estimator, channel estimation to perform an equalization process of a soft output maximum likelihood sequence equalizer (MLSE) during the training symbol field section, driving the soft output MLSE, and compensating for, by the soft output MLSE, distortion of the received signal during a data symbol field section in the frame on the basis of the adaptive equalization coefficient and an estimated result value of a channel, and recovering, by an error corrector which allows soft-decision processing to be performed, the received signal by performing error correction on the received signal in which the distortion is compensated for.

公开(公告)号：US12301281B2

公开(公告)日：2025-05-13

申请号：US17989844

申请日：2022-11-18

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Jung-yeol Oh ,  Hun Sik Kang ,  Sang Rok Moon

IPC: H04B10/079

Abstract: Provided are a method and apparatus for registering a new terminal using chromatic dispersion distance estimation. The method of registering a new terminal, performed by a transport unit (TU), includes performing frame synchronization through a downstream packet received from a transport node (TN), identifying a position of a frequency of a spectral null and a number of frequencies of spectral nulls through analysis on a frequency spectrum of the received downstream packet, estimating a transmission distance of an optical fiber to the TN, based on the identified position of the frequency of the spectral null and the identified number of frequencies of spectral nulls, and determining a timing of transmitting a registration request message, based on the estimated transmission distance, where the discovery information message is received from the TN.

公开(公告)号：US12166531B2

公开(公告)日：2024-12-10

申请号：US18096638

申请日：2023-01-13

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Joon Young Huh ,  Sae Kyoung Kang ,  Hun Sik Kang ,  Sang Rok Moon ,  Joon Ki Lee

IPC: H04B10/00 ,  H04B10/572 ,  H04B10/58 ,  H04J14/00

Abstract: Disclosed herein is an optical transmitter for generating a vestigial sideband (VSB) optical signal. The optical transmitter includes: a modulator configured based on a photonic integrated chip (PIC); an optical fiber block; and a lensed thin film filter implemented between the modulator configured based on the PIC and the optical fiber block. The PIC includes at least one grating coupler, and the lensed thin film filter is disposed so that an angle of an optical signal emitted from a first grating coupler of the PIC coincides with an angle of incident (AOI) of the lensed thin film filter to design the first grating coupler and the lensed thin film filter.

公开(公告)号：US12155398B2

公开(公告)日：2024-11-26

申请号：US18113756

申请日：2023-02-24

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： In Ki Hwang ,  Hun Sik Kang ,  Joon Ki Lee

IPC: H03M13/11

Abstract: Provided are a method of low-complexity decoding based on soft decision and a computing device for performing the method. The method of low-complexity decoding based on soft decision, performed by a computing device, includes receiving a vector, in which a codeword is modulated, through a channel, determining a decoding result by sequentially applying the received vector to one or more decoding algorithms, and decoding the codeword based on an analysis on the decoding result of a detector corresponding to each of the one or more decoding algorithms.