公开(公告)号：WO2010035974A3

公开(公告)日：2012-12-27

申请号：PCT/KR2009005196

申请日：2009-09-11

Applicant: KOREA ELECTRONICS TELECOMM ,  LEE NAM-KYUNG ,  HAN KI-SEOP ,  CHANG DAE-IG ,  LEE HO-JIN

Inventor： LEE NAM-KYUNG ,  HAN KI-SEOP ,  CHANG DAE-IG ,  LEE HO-JIN

IPC: H04N7/26

CPC classification number: H04N21/4305

Abstract: A method of reconstructing reference time information of a transmission frame in a digital satellite communication system is provided, including: receiving the transmission frame including reference time information; recording receiving time of start of frames of the plurality of physical layer frames included in the transmission frame; determining receiving time of a start of frame corresponding to the physical layer frames including the reference time information based on the recorded information when the physical layer frame including the reference time information is received; and reconstructing the reference time information based on the determined receiving time information of the start of frame. Network synchronization is stably acquired and maintained during two-way communication even in the satellite communication network environment.

Abstract translation: 提供一种在数字卫星通信系统中重建传输帧的参考时间信息的方法，包括：接收包括参考时间信息的传输帧; 记录包括在所述传输帧中的所述多个物理层帧的帧的开始的接收时间; 当接收到包括参考时间信息的物理层帧时，基于所记录的信息确定与包括基准时间信息的物理层帧相对应的帧起始帧的接收时间; 以及基于所确定的帧开始的接收时间信息来重构参考时间信息。 即使在卫星通信网络环境中，也可以在双向通信中稳定地获取和维护网络同步。

公开(公告)号：DE60329158D1

公开(公告)日：2009-10-22

申请号：DE60329158

申请日：2003-12-22

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： RYU JOON-GYU ,  JEONG HOON ,  LEE HO-JIN ,  OH DEOCK-GIL

IPC: H04L27/34 ,  H03D7/16 ,  H04B1/04 ,  H04B1/30 ,  H04B1/713

Abstract: Disclosed is a frequency hopping system for converting frequencies of signals into RF (radio frequency) signals, which comprises: a frequency hopper (200) for outputting signals with temporarily varied frequencies according to a predetermined pattern; a fixed PLL (phase locked loop) unit (500) for outputting frequency-fixed signals; a mixer (400) for mixing the output signals of the frequency hopper and the fixed PLL unit, and outputting frequency-hopped local signals; and a modulator (100) for receiving I and Q (in-phase and quadrature-phase) signals from a baseband device, synthesizing the I and Q signals with the frequency-hopped local signals, combining the two synthesized signals, and outputting RF signals.

公开(公告)号：AU9607801A

公开(公告)日：2002-05-21

申请号：AU9607801

申请日：2001-10-17

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： LIM KWANG-JAE ,  KIM SOO-YOUNG ,  LEE HO-JIN ,  YOU MOON-HEE

IPC: H04B7/26 ,  H04B7/185 ,  H04L12/56 ,  H04W74/08 ,  H04W84/06

Abstract: The present invention relates to Random Access Channel (RACH) access apparatus for mobile satellite communication system and method therefor. The method for accessing random access channel (RACH) on satellite system, random access channel (RACH) carrying message from a plurality of mobile stations to the satellite system, the method includes the steps of: receiving preamble and the message, the message successively transmitted with the preamble from the plurality of mobile stations; and transmitting acquisition response signal corresponding to the preamble or the message to the plurality of mobile stations. Accordingly, success of packet reception of satellite system is improved and transmission delay is reduced.

公开(公告)号：WO2010035973A3

公开(公告)日：2012-12-27

申请号：PCT/KR2009005191

申请日：2009-09-11

Applicant: KOREA ELECTRONICS TELECOMM ,  LEE NAM-KYUNG ,  CHANG DAE-IG ,  LEE HO-JIN

Inventor： LEE NAM-KYUNG ,  CHANG DAE-IG ,  LEE HO-JIN

IPC: H04N7/088 ,  H04N7/56

CPC classification number: H04N21/4385 ,  H04N21/2383 ,  H04N21/2389 ,  H04N21/242 ,  H04N21/4382 ,  H04N21/8547

Abstract: A variable length packet data transmission apparatus and method are provided. The variable length packet data transmission apparatus using a variable length packet transmission technique includes a data transmitter (10) generating synchronization information for synchronizing data communication with a data receiving apparatus (20), including the generated synchronization information in transmission data to be transmitted according to a variable length packet transmission technique, and transmitting the transmission data including the synchronization information to the data receiving apparatus (20), and a data receiver (20) receiving the transmission data including synchronization information from a data transmission apparatus (10), reconstructing the synchronization information included in the received transmission data, and performing synchronization with the data transmission apparatus (10) using the reconstructed synchronization information.

Abstract translation: 提供了一种可变长度分组数据传输装置和方法。 使用可变长度分组传输技术的可变长度分组数据传输装置包括产生用于与数据接收装置（20）同步数据通信的同步信息的数据发射机（10），包括根据根据 可变长度分组传输技术，并且将包括同步信息的传输数据发送到数据接收装置（20），以及从数据传输装置（10）接收包括同步信息的传输数据的数据接收机（20），重建 同步信息包括在接收到的发送数据中，并且使用重构的同步信息与数据发送装置（10）进行同步。

公开(公告)号：WO2010035959A3

公开(公告)日：2012-11-29

申请号：PCT/KR2009004796

申请日：2009-08-27

Applicant: KOREA ELECTRONICS TELECOMM ,  LEE NAM-KYUNG ,  CHANG DAE-IG ,  LEE HO-JIN

Inventor： LEE NAM-KYUNG ,  CHANG DAE-IG ,  LEE HO-JIN

IPC: H04N7/173 ,  H04N7/24

CPC classification number: H04N21/2381 ,  H04N21/238 ,  H04N21/242 ,  H04N21/4305 ,  H04N21/6143 ,  H04N21/6193

Abstract: Provided is a satellite network communication system based on Second Generation Digital Video Broadcasting via Satellite (DVB-S2). A method for encapsulating transmission data in a digital satellite communication system includes: determining whether a time at which a reference time information packet has to be inserted into a packet data unit is arrived, in the digital satellite communication system; and if the time at which the reference time information packet has to be inserted into the packet data unit is arrived, transforming the packet data unit in the form of a baseband data packet including the reference time information packet. Therefore, by allowing transmission of Network Clock Reference (NCR) information in a satellite communication environment based on Generic Steam Encapsulation (GSE), bidirectional satellite communications are possible.

Abstract translation: 提供了一种基于通过卫星的第二代数字视频广播（DVB-S2）的卫星网络通信系统。 一种在数字卫星通信系统中封装发送数据的方法包括：在数字卫星通信系统中，确定是否必须将参考时间信息分组插入分组数据单元的时间到达; 并且如果要将参考时间信息包必须插入分组数据单元的时间到达，则以包括基准时间信息包的基带数据分组的形式变换分组数据单元。 因此，通过允许基于通用蒸汽封装（GSE）的卫星通信环境中的网络时钟参考（NCR）信息的传输，双向卫星通信是可能的。

公开(公告)号：WO2010018934A2

公开(公告)日：2010-02-18

申请号：PCT/KR2009004043

申请日：2009-07-21

Applicant: KOREA ELECTRONICS TELECOMM ,  KWAK CHANGSOO ,  YOM IN-BOK ,  YUN SO-HYEUN ,  SHIN DONGHWAN ,  LEE HO-JIN

Inventor： KWAK CHANGSOO ,  YOM IN-BOK ,  YUN SO-HYEUN ,  SHIN DONGHWAN ,  LEE HO-JIN

IPC: H01Q1/42

CPC classification number: H01Q1/02 ,  H01Q1/42

Abstract: A system for controlling temperature of an antenna module including a heat generating module, and a radome and an underbody cover that enclose the heat generating module. The system includes: a heat collecting unit mounted on inner surface of the antenna module; a heat discharging unit mounted on outer surface of the antenna module; and a heat transfer unit for transferring heat from the heat collecting unit to the heat discharging unit.

Abstract translation: 一种用于控制包括发热模块的天线模块的温度的系统，以及包围发热模块的天线罩和底盖。 该系统包括：安装在天线模块的内表面上的集热单元; 安装在所述天线模块的外表面上的放热单元; 以及用于将热量从集热单元传递到散热单元的传热单元。

公开(公告)号：AT544259T

公开(公告)日：2012-02-15

申请号：AT02254815

申请日：2002-07-09

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： LEE SEUNG-JOON ,  CHO YONG-HOON ,  LEE HO-JIN

IPC: H04L7/00 ,  H04L7/02

Abstract: A receiving system for estimating symbol timing in a feed-forward manner comprises: a matched filter for receiving baseband signals and dividing them into real and imaginary numbers; a symbol timing estimator for receiving signals from the matched filter and estimating symbol timing using variables; a storage unit for storing the variables and outputting them according to requests of the symbol timing estimator; an interpolator for receiving a symbol timing estimate from the symbol timing estimator, and interpolating symbol-reading timing of the baseband signal; a delayer for delaying the baseband signal input to the interpolator; an RF/IF signal processor for receiving RF signals and performing RF/IF signal processing; and a baseband converter for converting the signal output from the RF/IF signal processor into baseband signals, and outputting them to the matched filter.

公开(公告)号：DE602004028180D1

公开(公告)日：2010-08-26

申请号：DE602004028180

申请日：2004-12-27

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： KIM BYOUNG-HAK ,  LEE HO-JIN ,  KIM HO-KYOM ,  OH DEOCK-GIL

IPC: H04J3/06 ,  H04L7/00 ,  H04L7/033 ,  H04N7/24

公开(公告)号：DE602004025786D1

公开(公告)日：2010-04-15

申请号：DE602004025786

申请日：2004-08-06

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： LEE HO-JIN ,  OH DEOCK-GIL ,  LEE KI-DONG ,  KIM HO-KYOM

IPC: H04B7/185 ,  H04B7/26

Abstract: A method for controlling data transmission rate in order to save waste of resources due to Non-Line Of Sight (NLOS) region when a mobile terminal passes through the NLOS region in an interactive satellite communication system is disclosed. The method includes the steps of setting at least one threshold; at a Network Control Center (NCC) adjusting allocated resources based on the Constant Resources Allocation (CRA) after detecting whether Satellite Access Control is lost or not; compensating transmission delay by reallocating if the mobile terminal returns from the NLOS region within a first threshold duration, wherein the mobile terminal maintains the fine sync state during the first threshold duration; and deallocating all resources allocated based on the CRA if the mobile terminal does not return from the NLOS region within the first threshold duration.

公开(公告)号：AT474389T

公开(公告)日：2010-07-15

申请号：AT07124129

申请日：2004-12-27

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： KIM BYOUNG-HAK ,  LEE HO-JIN ,  KIM HO-KYOM ,  OH DEOCK-GIL

IPC: H04J3/06 ,  H04L7/00 ,  H04L7/033 ,  H04N7/24

Abstract: A reference clock recovery apparatus is provided and includes a tuning unit for receiving a modulated signal and converting the modulated signal into a digital value; a first frequency difference detecting unit for detecting a frequency difference between the central station and a terminal; first and second filtering unit for smoothing the frequency difference; a second frequency difference detecting unit for causing the terminal to maintain a synchronization to the cl.ock of the central station; a switching unit for selecting an operation of the first frequency difference detecting unit or an operation of the second frequency difference detecting unit; an digital-to-analog converting unit for converting a digital signal into an analog signal; an oscillating unit for receiving an output of the digital-to-analog converting unit and outputting a desired frequency; a counting unit for counting the clocks and outputting the count value; and a transmitting unit for transmits the timing information.