公开(公告)号：US11050593B1

公开(公告)日：2021-06-29

申请号：US16866007

申请日：2020-05-04

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Kwan-Woong Ryu ,  Jin-Hyuk Song ,  Joon-Young Jung ,  Dong-Joon Choi

IPC: H04L25/02 ,  H04L27/26 ,  H04L27/00 ,  H04L25/03

Abstract: Disclosed herein are a synchronization apparatus and method for a upstream system. The synchronization apparatus for a upstream system includes one or more processors, and execution memory for storing at least one program that is executed by the one or more processors, wherein the at least one program is configured to receive a signal and calculate a first channel estimation value for the received signal using a predefined pilot, and calculate a second channel estimation value using a predefined complementary pilot and the first channel estimation value.

公开(公告)号：US10425906B2

公开(公告)日：2019-09-24

申请号：US15819969

申请日：2017-11-21

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Sang-Jung Ra ,  Jin-Hyuk Song ,  Ho-Sook Lee ,  Dong-Joon Choi ,  Joon-Young Jung ,  Nam-Ho Hur

IPC: H04W56/00 ,  H04N7/10 ,  H04N7/22 ,  H04N5/455 ,  H04N21/61 ,  H04N7/173 ,  H04N21/239

Abstract: Disclosed herein are an apparatus and method for detecting an upstream RF signal based on a preamble. The apparatus for detecting an upstream RF signal based on a preamble includes an analog-to-digital converter unit for receiving an RF analog signal and converting the same into an RF digital signal; a down-converter unit for converting the RF digital signal into a baseband digital signal; a packet detection unit for performing packet detection by performing an operation on the baseband digital signal and preset differential preamble signals; and a timing calculation unit for generating timing information of a terminal device based on the baseband digital signal and time information generated through the packet detection.

公开(公告)号：US10291422B2

公开(公告)日：2019-05-14

申请号：US15793650

申请日：2017-10-25

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Dong-Joon Choi ,  Joon-Young Jung ,  Nam-Ho Hur

IPC: H04J3/06 ,  H04M7/12 ,  H04L12/28 ,  H04L12/70 ,  H04L29/06 ,  H04N21/61 ,  H04N21/242

Abstract: Disclosed herein is a synchronization method for transmitting a DOCSIS upstream signal, which is performed by an RoIP terminal, the synchronization method including receiving a synchronization (SYNC) message periodically sent by a Cable Modem Termination System (CMTS) and thereby synchronizing a clock and generating a reference time; receiving a ranging request signal from a Cable Modem (CM); including information about a start time of an allocated ranging interval in the ranging request signal, converting the ranging request signal into an IP packet, and transmitting the IP packet to an RoIP headend device over an IP network in order to enable the RoIP headend device to convert the ranging request signal, delivered via the IP network, into an RF signal and transmit the RF signal to the CMTS; and converting a ranging response message delivered from the CMTS into an electric signal and transmitting the electric signal to the CM.