公开(公告)号：KR20090062904A

公开(公告)日：2009-06-17

申请号：KR20070130388

申请日：2007-12-13

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： KANG YEON SU ,  KANG KUN SEOK ,  AHN DO SEOB ,  LEE HO JIN

IPC: H04B7/185

CPC classification number: H04L1/0668

Abstract: A method for transmitting a signal in a satellite communication system with a terrestrial assistant device is provided to apply space-time coding techniques, thereby improving receiving signal quality of an area where a signal of satellite or terrestrial assistant devices can be received. A core network produces the first symbol index and the second symbol index about the first transmission signal and the second transmission signal(S100). The core network generates the first and second transmission data symbols which are alpha and beta(S120). A space-time code is generated based on the first and second symbol indexes and the first and second transmission data symbols(S130). After the space-time code is transmitted to a satellite, the code is transmitted to a terminal through a terrestrial assistant device or transmitted to the terminal from the satellite.

Abstract translation: 提供了一种用于在具有地面辅助设备的卫星通信系统中发送信号的方法以应用空时编码技术，从而提高可以接收卫星或地面辅助设备的信号的区域的接收信号质量。 核心网络产生关于第一传输信号和第二传输信号的第一符号索引和第二符号索引（S100）。 核心网络生成α和β的第一和第二传输数据符号（S120）。 基于第一和第二符号索引以及第一和第二传输数据符号产生时空代码（S130）。 在将空时代码发送到卫星之后，通过地面辅助设备将码发送到终端，或者从卫星发送到终端。

公开(公告)号：KR100948692B1

公开(公告)日：2010-03-18

申请号：KR20080093358

申请日：2008-09-23

Applicant: KOREA ELECTRONICS TELECOMM

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

IPC: H04L29/02 ,  H04L27/02

CPC classification number: H04N21/4305

Abstract: PURPOSE: A reference time information restoring method and a device and a data reception device thereof are provided to maintain stable network synchronization by restoring an exact value by preventing inconsistencies between a transmission time and reception time. CONSTITUTION: A communications unit(100) receives the transmission stream of an external data transmission device. A reception time record unit(110) records the reception time of an initial frame of a plurality of physical layer frames included in the transmission frame. A reception time recognition unit(120) recognizes the reception time of an initial frame corresponding to a physical layer frame including the reference time information of the transmission frame. A restoring unit(130) restores reference time information according to the reception time information of an initial frame of the physical layer frame. A synchronization unit(140) synchronizes with a data transmission device which transmits a transmission frame through the communications unit based on the reference time information. An error correction unit(150) corrects errors in a data transmission process.

Abstract translation: 目的：提供参考时间信息恢复方法及其装置和数据接收装置，以通过防止传输时间与接收时间之间的不一致来恢复精确值来维持稳定的网络同步。 构成：通信单元（100）接收外部数据传输设备的传输流。 接收时间记录单元（110）记录包含在传输帧中的多个物理层帧的初始帧的接收时间。 接收时间识别单元（120）识别与包括传输帧的参考时间信息的物理层帧相对应的初始帧的接收时间。 恢复单元（130）根据物理层帧的初始帧的接收时间信息恢复基准时间信息。 同步单元（140）与基于参考时间信息通过通信单元发送传输帧的数据传输设备同步。 纠错单元（150）纠正数据传输过程中的错误。

公开(公告)号：KR100945532B1

公开(公告)日：2010-03-09

申请号：KR20080099497

申请日：2008-10-10

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： KIM PAN SOO ,  CHANG DAE IG ,  LEE HO JIN ,  KIM JIN YOUNG ,  PARK JAE SUNG ,  LIM YOUNG SUN

IPC: H04L27/22 ,  H04L1/00

CPC classification number: H04L27/22 ,  H04L1/0047 ,  H04L1/005 ,  H04L1/0066 ,  H04L2027/0067

Abstract: PURPOSE: An apparatus and a method for estimating phase error using a variable step size are provided to improve remarkably the astriction-speed and the accuracy of the estimation by forming an outside single estimator using the LMS(Least Mean Square) algorithm having the variable step size. CONSTITUTION: An APP mean value production unit(61) produces a posterior probability mean value from the soft-decision result for the current receiving symbol. A step size determination unit(62) determines variably the step size according to the channel condition. A phase error estimated unit(63) estimates the phase error of the current receiving symbol from the phase error and the posterior probability mean value of the previous receiving symbol using the step size which was variably determined. The soft-decision result is the soft decision output information which is generated in the decoding procedure of a turbo decoder.

Abstract translation: 目的：提供一种用于使用可变步长来估计相位误差的装置和方法，以通过使用具有可变步长的LMS（最小均方）算法形成外部单个估计器来显着地改善估计的收缩速度和精度 尺寸。 构成：APP平均值生产单元（61）根据当前接收符号的软判决结果产生后验概率平均值。 步长确定单元（62）根据信道条件可变地确定步长。 相位误差估计单元（63）使用可变确定的步长从相位误差和先前接收符号的后验概率平均值估计当前接收符号的相位误差。 软判决结果是在turbo解码器的解码过程中产生的软决策输出信息。

公开(公告)号：KR100902335B1

公开(公告)日：2009-06-12

申请号：KR20070132496

申请日：2007-12-17

Applicant: KOREA ELECTRONICS TELECOMM

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

IPC: H04L7/00 ,  H04B7/26 ,  H04J3/00

CPC classification number: H04B7/2125 ,  H04B7/18589 ,  H04W56/0075 ,  H04L27/3405

Abstract: An NCR packet insertion in satellite communication systems is provided to transmit steadily the NCR(net clock reference) value. The MODCOD having the lowest error rate is selected(102). The NCR value is inserted into the selected MODCOD frame. The MODCOD frame is transmitted to the reception terminal(103). The timer is the reset(104). The time value is increased. The arrival time value of packet is compared with the time value(106). If the time value is smaller than a threshold value(107), the time value is continually increased. If not so, the presence of selected MODCOD is confirmed(110). If there is no the selected MODCOD, the time value is increased.

Abstract translation: 提供在卫星通信系统中的NCR分组插入以稳定地传送NCR（净时钟参考）值。 选择具有最低错误率的MODCOD（102）。 将NCR值插入到所选的MODCOD帧中。 MODCOD帧被发送到接收终端（103）。 定时器是复位（104）。 时间值增加。 将分组的到达时间值与时间值（106）进行比较。 如果时间值小于阈值（107），则时间值不断增加。 如果不是这样，确认所选MODCOD的存在（110）。 如果没有选择的MODCOD，则时间值增加。