公开(公告)号：US09059886B1

公开(公告)日：2015-06-16

申请号：US14308997

申请日：2014-06-19

Applicant: Electronics and Telecommunications Research Institute

Inventor： Jae-Ho Lee ,  Sang-Jung Ra ,  Dong Joon Choi ,  Namho Hur

IPC: H04L27/26

CPC classification number: H04L27/2613 ,  H04L27/2607 ,  H04L27/2627 ,  H04L27/2646

Abstract: In an orthogonal frequency division multiplexing (OFDM) wireless communication system, when path delay information is received from a reception apparatus through a return path after data transmission, a length of a cyclic prefix included in a transmitted signal is adjusted on the basis of a delay value included in the path delay information.

Abstract translation: 在正交频分复用（OFDM）无线通信系统中，当在数据发送之后通过返回路径从接收装置接收到路径延迟信息时，根据延迟来调整包含在发送信号中的循环前缀的长度 值包含在路径延迟信息中。

公开(公告)号：US11190333B2

公开(公告)日：2021-11-30

申请号：US16839916

申请日：2020-04-03

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Myung-Sun Baek ,  Sang-Jung Ra ,  Byungjun Bae ,  Yong Seong Cho ,  Hyoung Kyu Song ,  Won-Seok Lee

IPC: H04L7/00 ,  H04L27/26

Abstract: A method and an apparatus for estimating synchronization of a broadcast signal in a time domain using a synchronization estimation signal through steps of: performing a correlation operation using a correlation window on a plurality of synchronization estimation signals separated to a plurality of paths and outputting a plurality of correlated signals; delaying the plurality of correlated signals to output a plurality of delayed signals; and estimating the synchronization using the plurality of delayed signals are provided.

公开(公告)号：US20180167902A1

公开(公告)日：2018-06-14

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

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：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：US10110275B2

公开(公告)日：2018-10-23

申请号：US15656906

申请日：2017-07-21

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Jae Hwui Bae ,  Sang-Jung Ra ,  Jin Hyuk Song ,  Joon Young Jung ,  Dong Joon Choi ,  Namho Hur

IPC: H04B3/00 ,  H04B3/46 ,  H04B17/21 ,  H04B1/06 ,  H04B3/23 ,  H04L5/00 ,  H04L7/00 ,  H04L29/08

Abstract: A method of estimating an integer frequency offset and compensating for the integer frequency offset by an estimated error is provided. A frequency offset estimation method may include receiving a reception signal including PLC data and a physical layer link channel (PLC) preamble, detecting first position information on a position of a subcarrier of the PLC preamble in a frequency axis from the reception signal through a cross-correlation between the PLC preamble and the reception signal, detecting second position information on the position of the subcarrier of the PLC preamble defined in a transmission end by restoring the PLC data, and calculating a frequency offset by comparing the first position information with the second position information.