公开(公告)号：US11201666B2

公开(公告)日：2021-12-14

申请号：US16723448

申请日：2019-12-20

Applicant: Electronics and Telecommunications Research Institute

Inventor： Pansoo Kim ,  Deock Gil Oh ,  Joon Gyu Ryu

IPC: H04B7/204 ,  H04B7/185

Abstract: Disclosed is a communication method of a satellite and a ground station and apparatuses performing the same. The communication method includes transmitting a plurality of frames to a satellite based on a beam hopping time plan (BHTP) of the satellite and a ground station and synchronizing the BHTP based on an index of a frame received through a beam switching window (BSW) allocated to the ground station among the plurality of frames, and an identification value indicating at least one sub-frame included in the frame.

公开(公告)号：US10411790B2

公开(公告)日：2019-09-10

申请号：US15726006

申请日：2017-10-05

Applicant: Electronics and Telecommunications Research Institute

Inventor： Hyun Ha Hong ,  Mankyu Park ,  Deock Gil Oh ,  Joon Gyu Ryu ,  Dae Ig Chang

IPC: H04H20/74 ,  H04B7/185 ,  H04H60/90 ,  H04N7/20 ,  H04H40/90 ,  H04H20/42 ,  H04H60/80 ,  H04L27/00

Abstract: Disclosed is a star network/mesh network accessing method and apparatus of a terminal in a satellite communication system, the method including receiving time slot resources from a central station and operating in a time division multiple access (TDMA) start network communication mode between the central station and a terminal, transferring, to the central station, a TDMA mesh network connection request message for a destination terminal, receiving traffic burst time plan (TBTP) information corresponding to the TDMA mesh network connection request message from the central station and operating in a TDMA mesh network communication mode between terminals, and switching from the TDMA mesh network communication mode between the terminals to a single channel per carrier (SCPC) mesh network communication mode between the terminals when Voice over Internet Protocol (VoIP) traffic is greater than a threshold.

公开(公告)号：US20140245361A1

公开(公告)日：2014-08-28

申请号：US14188823

申请日：2014-02-25

Applicant: Electronics and Telecommunications Research Institute

Inventor： Jun Gil JEON ,  Joon Gyu Ryu ,  Min Su Shin ,  Deock Gil Oh

IPC: H04N21/61 ,  H04N21/44 ,  H04N19/50

CPC classification number: H04N5/4401 ,  H04H40/90 ,  H04N19/30 ,  H04N21/234327 ,  H04N21/42607 ,  H04N21/44209 ,  H04N21/6143

Abstract: Provided is a multilevel satellite broadcasting system for providing a hierarchical satellite broadcasting, including a demodulator to demodulate a transmitted multilevel compression stream based on a modulation parameter, a hierarchical video decoder to receive the demodulated multilevel compression stream, and a channel predicting and controlling unit to process at least one of channel prediction and channel control with respect to the demodulated multilevel compression stream based on channel information of the demodulator.

Abstract translation: 提供了一种用于提供分级卫星广播的多级卫星广播系统，包括：解调器，用于基于调制参数解调发送的多级压缩流;分层视频解码器，用于接收解调的多级压缩流;以及信道预测和控制单元， 基于解调器的信道信息处理关于解调的多级压缩流的信道预测和信道控制中的至少一个。

公开(公告)号：US20220141073A1

公开(公告)日：2022-05-05

申请号：US17494464

申请日：2021-10-05

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Soo Yeob Jung ,  Pan Soo Kim ,  Joon Gyu Ryu ,  Gyeong Rae Im ,  Dong Hyun Jung

IPC: H04L27/26

Abstract: A method for receiving a wireless signal, performed by a first communication node, may comprise: storing a wireless signal received by the first communication node as samples in a buffer; performing partial correlation operations on the stored samples by a plurality of partial correlators; performing a first FFT operation on results of the partial correlation operations; performing a cumulative product operation on results of the first FFT operation; performing a second FFT operation based on a result of the cumulative product operation; and performing synchronization estimation based on the results of the first FFT operation and a result of the second FFT operation.

公开(公告)号：US10911133B2

公开(公告)日：2021-02-02

申请号：US16181149

申请日：2018-11-05

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Jonggyu Oh ,  Pansoo Kim ,  Deock Gil Oh ,  Joon Gyu Ryu ,  Soo Yeob Jung

IPC: H04B7/185 ,  H04B7/212 ,  H04W72/04 ,  H04W84/06 ,  H04B7/155 ,  H04W56/00

Abstract: Disclosed is a communication method performed between a satellite and a ground station and apparatuses performing the communication method. The communication method includes transmitting a plurality of frames based on a beam allocation time schedule (BATS) between a satellite and a ground station, and synchronizing the BATS based on a reception time and a detection time of one or more frames among the plurality of frames to be received through a beam open window (BOW) allocated to the ground station.

公开(公告)号：US10057869B2

公开(公告)日：2018-08-21

申请号：US15815259

申请日：2017-11-16

Applicant: Electronics and Telecommunications Research Institute

Inventor： Joon Gyu Ryu ,  Soo Yeob Jung ,  Deock Gil Oh ,  Jonggyu Oh

IPC: H04B7/19 ,  H04W56/00 ,  H04W84/06

CPC classification number: H04W56/004 ,  H04W84/06

Abstract: Disclosed is a network synchronization apparatus and method of a time division multiple access (TDMA)-based mesh network satellite communication system, the network synchronization method of a terminal in a satellite communication system including receiving timing error information from a central station, generating a mesh superframe start time (SST′) by reversing a sign of the timing error information, and receiving traffic information transmitted by a transmission terminal using the mesh SST′.

公开(公告)号：US09692527B2

公开(公告)日：2017-06-27

申请号：US15260964

申请日：2016-09-09

Applicant: Electronics and Telecommunications Research Institute

Inventor： Joon Gyu Ryu

IPC: H04B1/10 ,  H04B15/00 ,  H04W84/06 ,  H04L7/00

CPC classification number: H04B15/00 ,  H04B7/185 ,  H04B7/1851 ,  H04B7/18519 ,  H04B7/212 ,  H04B7/2656 ,  H04L7/0008 ,  H04N21/8547 ,  H04W56/0015

Abstract: Provided is an apparatus for an interference signal cancellation of a central station. The apparatus includes: a communication unit; a storage unit configured to store a transmission signal of the central station received via the communication unit; and a signal processor configured to extract first time synchronization information (NCR) of a current time and second time synchronization information (NCR) included in an overlapping signal and calculate a difference value between the two time synchronization information, when the overlapping signal which is an overlapped signal of a terminal station is received on the same channel as a channel of the transmission signal of the central station, and to extract the transmission signal of the central station stored in a previous time in the storage unit based on the difference value and remove an interference signal included in the overlapping signal.

公开(公告)号：US09083379B2

公开(公告)日：2015-07-14

申请号：US14301753

申请日：2014-06-11

Applicant: Electronics and Telecommunications Research Institute

Inventor： Soo Yeob Jung ,  Pan Soo Kim ,  Joon Gyu Ryu ,  Deock Gil Oh

IPC: H03M1/66

CPC classification number: H03M1/662 ,  H03M1/0624 ,  H03M1/66

Abstract: Provided is a system and method for synchronization between digital-to-analog converters (DAC) for high speed signal processing. A synchronization method of a multi-DAC apparatus may include: inputting a clock to a multiplexer (MUX) DAC; dividing the clock into a first clock and a second clock; transferring a phase difference between the first clock and the second clock to a D flip-flop; and synchronizing the first clock and the second clock by processing the phase difference.

Abstract translation: 提供了用于高速信号处理的数模转换器（DAC）之间的同步的系统和方法。 多DAC装置的同步方法可以包括：将时钟输入到多路复用器（MUX）DAC; 将时钟分为第一时钟和第二时钟; 将第一时钟和第二时钟之间的相位差传送到D触发器; 以及通过处理所述相位差来同步所述第一时钟和所述第二时钟。

公开(公告)号：US09025679B2

公开(公告)日：2015-05-05

申请号：US13972288

申请日：2013-08-21

Applicant: Electronics and Telecommunications Research Institute

Inventor： Joon Gyu Ryu ,  Do Huy Wang ,  Deock Gil Oh

IPC: H04L27/00 ,  H04B7/185 ,  H04L1/00

CPC classification number: H04B7/18519 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0015

Abstract: An adaptive coding and modulation (ACM) apparatus and method for a forward link in satellite communication is provided. The ACM apparatus may include a receiving unit to receive a signal-to-noise ratio (SNR) of a received signal, a determination unit to determine whether the SNR of the received signal is less than or equal to a threshold value, and a processing unit to execute a channel prediction algorithm when the SNR of the received signal is determined to be less than or equal to the threshold value.

Abstract translation: 提供了用于卫星通信中的前向链路的自适应编码和调制（ACM）装置和方法。 ACM装置可以包括：接收单元，用于接收接收信号的信噪比（SNR）;确定单元，用于确定接收信号的SNR是否小于或等于阈值;以及处理 当接收信号的SNR被确定为小于或等于阈值时执行信道预测算法的单元。

公开(公告)号：US11870550B2

公开(公告)日：2024-01-09

申请号：US17361575

申请日：2021-06-29

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Pansoo Kim ,  Soo Yeob Jung ,  Joon Gyu Ryu

IPC: H04J13/00 ,  H04L5/00 ,  H04B17/327 ,  H04L1/00 ,  H04L27/00 ,  H04W72/23 ,  H04B17/318

CPC classification number: H04J13/0051 ,  H04B17/318 ,  H04B17/327 ,  H04J13/0044 ,  H04L1/0063 ,  H04L1/0071 ,  H04L5/0048 ,  H04L27/0014 ,  H04W72/23 ,  H04L2027/0065

Abstract: An ultra-low power data transmission method and apparatus are disclosed. An ultra-low power data transmission method to be performed by a user terminal of an ultra-low power data transmission system includes performing channel coding on a payload included in a transmission packet; interleaving a payload obtained through the channel coding, spreading the interleaved payload using a gold code and an orthogonal variable spreading factor (OVSF), combining a synchronization header spread using the gold code and the OVSF with the spread payload, and modulating a transmission packet in which the payload and the synchronization header are combined.