公开(公告)号：US07940713B2

公开(公告)日：2011-05-10

申请号：US11635295

申请日：2006-12-07

申请人： Gwang-Ja Jin ,  Min-Su Shin ,  Nam-Kyung Lee ,  Deock-Gil Oh ,  Ho-Jin Lee

发明人： Gwang-Ja Jin ,  Min-Su Shin ,  Nam-Kyung Lee ,  Deock-Gil Oh ,  Ho-Jin Lee

IPC分类号： H04L12/56

CPC分类号： H04L47/10 ,  H04B7/18593 ,  H04L47/14 ,  H04L47/40 ,  H04L63/0272 ,  H04L63/0428 ,  H04L63/164 ,  H04L69/16 ,  H04L69/161 ,  H04L69/163 ,  H04L69/168 ,  H04W12/02 ,  H04W80/04

摘要： There are provided an apparatus and method for traffic performance improvement and traffic security in an interactive satellite communication system. The method for traffic performance improvement of an interactive satellite communication system includes the steps of: a) storing an Internet protocol (IP) packet that is received from a user terminal connected to a satellite mobile terminal of the interactive satellite communication system and is to be transmitted to a central station through a satellite; b) transmitting acknowledgement for the stored IP packet to the user terminal by acting for the central station, before the stored IP packet is transmitted to the central station; and c) transmitting the stored IP packet through the satellite to the central station, and retransmitting an unacknowledged IP packet according to a retransmission request of the central station.

摘要翻译： 提供了一种用于交互式卫星通信系统中的交通性能改善和交通安全的装置和方法。 交互式卫星通信系统的交通性能改善方法包括以下步骤：a）存储从连接到交互式卫星通信系统的卫星移动终端的用户终端接收到的因特网协议（IP）分组， 通过卫星传送到中心站; b）在所存储的IP分组被发送到中心站之前，通过对中心站的动作来向所述用户终端发送所存储的IP分组的确认; 以及c）通过所述卫星将所存储的IP分组发送到所述中心站，并且根据所述中心站的重发请求重传未确认的IP分组。

公开(公告)号：US20070133528A1

公开(公告)日：2007-06-14

申请号：US11635295

申请日：2006-12-07

申请人： Gwang-Ja Jin ,  Min-Su Shin ,  Nam-Kyung Lee ,  Deock-Gil Oh ,  Ho-Jin Lee

发明人： Gwang-Ja Jin ,  Min-Su Shin ,  Nam-Kyung Lee ,  Deock-Gil Oh ,  Ho-Jin Lee

IPC分类号： H04L12/56 ,  H04L12/54

CPC分类号： H04L47/10 ,  H04B7/18593 ,  H04L47/14 ,  H04L47/40 ,  H04L63/0272 ,  H04L63/0428 ,  H04L63/164 ,  H04L69/16 ,  H04L69/161 ,  H04L69/163 ,  H04L69/168 ,  H04W12/02 ,  H04W80/04

摘要： There are provided an apparatus and method for traffic performance improvement and traffic security in an interactive satellite communication system. The method for traffic performance improvement of an interactive satellite communication system includes the steps of: a) storing an Internet protocol (IP) packet that is received from a user terminal connected to a satellite mobile terminal of the interactive satellite communication system and is to be transmitted to a central station through a satellite; b) transmitting acknowledgement for the stored IP packet to the user terminal by acting for the central station, before the stored IP packet is transmitted to the central station; and c) transmitting the stored IP packet through the satellite to the central station, and retransmitting an unacknowledged IP packet according to a retransmission request of the central station.

摘要翻译： 提供了一种用于交互式卫星通信系统中的交通性能改善和交通安全的装置和方法。 交互式卫星通信系统的交通性能改善方法包括以下步骤：a）存储从连接到交互式卫星通信系统的卫星移动终端的用户终端接收到的因特网协议（IP）分组， 通过卫星传送到中心站; b）在所存储的IP分组被发送到中心站之前，通过对中心站的动作来向所述用户终端发送所存储的IP分组的确认; 以及c）通过所述卫星将所存储的IP分组发送到所述中心站，并且根据所述中心站的重发请求重传未确认的IP分组。

公开(公告)号：US07782823B2

公开(公告)日：2010-08-24

申请号：US11305587

申请日：2005-12-16

申请人： Ki-Dong Lee ,  Deock-Gil Oh ,  Ho-Jin Lee

发明人： Ki-Dong Lee ,  Deock-Gil Oh ,  Ho-Jin Lee

IPC分类号： H04Q7/00

CPC分类号： H04L41/0896 ,  H04W28/20

摘要： Provided are an apparatus for estimating an increment in the number of packets arriving at a transmission queue of each terminal and allocating resources to terminals based on the increment in a Demand Assignment Multiple Access (DAMA) satellite communication system, and a method thereof. The method, includes the steps of: a) comparing a summation of requested time slot quantities of terminals with a total number of available time slots; and b) allocating the time slots as much as the requested time slot quantity to each terminal and allocating remaining time slots additionally in proportion to an estimated increase in the number of packets arriving at a transmission queue of each terminal. The apparatus can raise efficiency of resources allocation in DAMA communications and reduce the packet transmission time in a terminal transmission queue.

摘要翻译： 提供了一种用于估计到达每个终端的传输队列的分组数量的增量的装置，并且基于在请求分配多路访问（DAMA）卫星通信系统中的增量向终端分配资源及其方法。 该方法包括以下步骤：a）将所请求的终端时隙量的总和与可用时隙的总数进行比较; 以及b）将所请求的时隙数量的时隙分配给每个终端，并且分配剩余时隙，以与到达每个终端的传输队列的分组数量的估计增加成比例地分配剩余时隙。 该装置可以提高DAMA通信中资源分配的效率，并减少终端传输队列中的分组传输时间。

公开(公告)号：US20060115013A1

公开(公告)日：2006-06-01

申请号：US11184592

申请日：2005-07-19

申请人： Il Kim ,  Ho-Kyom Kim ,  Deock-Gil Oh ,  Ho-Jin Lee

发明人： Il Kim ,  Ho-Kyom Kim ,  Deock-Gil Oh ,  Ho-Jin Lee

IPC分类号： H04L23/02

CPC分类号： H04L27/0012

摘要： A blind modulation classification apparatus in a satellite communication system improves performance in non-ideal communication environment having frequency error and phase error, by reducing computational burden of test statistic and possibility of numerical error of hardware, with computation of likelihood for each stage independently. The blind modulation classification apparatus includes a plurality of likelihood computing units, each for computing a likelihood value of a received baseband signal for corresponding one of a plurality of modulation schemes; a maximum selecting and setting units for selecting the maximum among the calculated likelihood values and setting a flag corresponding to the maximum to ‘1’ and the other flags to ‘0’; a plurality of flag summing-up units for summing up the flags of the plurality of the modulation schemes; and a modulation scheme selecting unit for selecting the maximum among the summed-up values and selecting the modulation scheme corresponding to the selected value.

摘要翻译： 卫星通信系统中的盲调制分类装置通过减少测试统计量的计算负担和硬件的数值误差的可能性，通过独立地计算每个阶段的可能性来提高具有频率误差和相位误差的非理想通信环境中的性能。 盲调制分类装置包括多个似然度计算单元，每个似然运算单元用于计算多个调制方案中的相应一个的接收基带信号的似然值; 最大选择和设置单位，用于在所计算的似然值中选择最大值，并将与最大值相对应的标志设置为“1”，将其他标志设置为“0”; 多个标记求和单元，用于对多个调制方案的标志进行相加; 以及调制方式选择单元，用于选择累加值中的最大值，并选择与所选值对应的调制方案。

公开(公告)号：US08259646B2

公开(公告)日：2012-09-04

申请号：US12517432

申请日：2007-12-03

申请人： Pan-Soo Kim ,  Dae-Ig Jang ,  Deock-Gil Oh ,  Ho-Jin Lee

发明人： Pan-Soo Kim ,  Dae-Ig Jang ,  Deock-Gil Oh ,  Ho-Jin Lee

IPC分类号： H04J3/06

CPC分类号： H04L7/042 ,  H04L7/046 ,  H04L27/0014 ,  H04L2027/003

摘要： An apparatus and method for acquiring reliable frame synchronization performance and frequency synchronization simultaneously in a communication system includes a differential correlator outputting a result value obtained by performing a differential operation based on an input signal having symbol timing synchronization and a value pre-defined with a sender sending the input signal, a frequency error calculator compensating for a frequency error based on the result value of the differential correlator and a frequency compensation control signal, and a frame synchronization determiner outputting the frequency compensation control signal if the result value of the differential correlator is greater than a threshold set having at least one value. By introducing a correlation scheme, i.e. Differential Generalized Post Detection Integration (DGPDI), in which differential information corresponding to a half of a symbol duration length is used within a duration from a frame start symbol to a UW symbol duration in a TDM/TDMA transmission structure in which a low SNR and a high frequency error must be considered, a more reliable frame synchronization estimation value can be acquired in comparison to a conventional frame synchronization scheme in which differential information between single neighbor symbols is used.

摘要翻译： 一种用于在通信系统中同时获取可靠的帧同步性能和频率同步的装置和方法包括差分相关器，其输出通过基于具有符号定时同步的输入信号执行差分运算而得到的结果值，以及预定义的发送器 发送输入信号，基于差分相关器的结果值和频率补偿控制信号来补偿频率误差的频率误差计算器，以及如果差分相关器的结果值为 大于具有至少一个值的阈值集合。 通过引入相关方案，即差分广义后检测积分（DGPDI），其中对应于符号持续时间长度的一半的差分信息在TDM / TDMA传输中的帧开始符号到UW符号持续时间的持续时间内被使用 必须考虑低SNR和高频误差的结构，与使用单个相邻符号之间的差分信息的常规帧同步方案相比，可以获得更可靠的帧同步估计值。

公开(公告)号：US07616710B2

公开(公告)日：2009-11-10

申请号：US11297257

申请日：2005-12-07

申请人： Pan-Soo Kim ,  Yun-Jeoug Song ,  Byoung-Hak Kim ,  Deock-Gil Oh ,  Ho-Jin Lee

发明人： Pan-Soo Kim ,  Yun-Jeoug Song ,  Byoung-Hak Kim ,  Deock-Gil Oh ,  Ho-Jin Lee

IPC分类号： H04L27/14

CPC分类号： H04L27/0014 ,  H04L2027/003 ,  H04L2027/0046 ,  H04L2027/0065

摘要： Provided is a method for estimating carrier wave or doppler frequency offset based on an approximated quadratic non-linear function in fine search, and a receiver employing the method. The method for estimating frequency offset includes the steps of: a) extracting more than three discrete samples in an order where the discrete samples are close to a maximum value of a power spectrum density function; b) inducing a quadratic non-linear function by using the extracted discrete samples; and c) estimating the frequency offset from a maximum point of the quadratic non-linear function. The technology of the present research makes it possible to exactly estimate frequency offset without increasing hardware complexity in estimation of carrier wave or doppler frequency offset.

摘要翻译： 提供了一种基于精细搜索中的近似二次非线性函数来估计载波或多普勒频率偏移的方法，以及采用该方法的接收机。 用于估计频率偏移的方法包括以下步骤：a）以离散样本接近功率谱密度函数的最大值的顺序提取三个以上的离散样本; b）通过使用提取的离散样本来诱导二次非线性函数; 以及c）从二次非线性函数的最大点估计频率偏移。 本研究的技术使得可以精确估计频偏，而不增加载波或多普勒频偏估计中的硬件复杂度。

公开(公告)号：US20080310560A1

公开(公告)日：2008-12-18

申请号：US12094717

申请日：2006-05-26

申请人： Pan-Soo Kim ,  Yun-Jeong Song ,  Byoung-Hak Kim ,  Deock-Gil Oh ,  Ho-Jin Lee ,  Jun Heo ,  Joong-Gon Ryoo

发明人： Pan-Soo Kim ,  Yun-Jeong Song ,  Byoung-Hak Kim ,  Deock-Gil Oh ,  Ho-Jin Lee ,  Jun Heo ,  Joong-Gon Ryoo

IPC分类号： H04L27/06

CPC分类号： H04L1/205 ,  H03M13/2957 ,  H03M13/296 ,  H04L1/005 ,  H04L1/0066 ,  H04L1/0071

摘要： Provided is an apparatus for estimating phase offsets of multiple survival paths and a satellite communication system using the same. The apparatus includes: upper/lower decoding units for obtaining a phase offset estimation value and estimating phase offsets of each survival path based on a stored parameter estimation value of a previous state inputted from an external device; an interleaving/de-interleaving unit for minimizing correlation between data used to estimate a parameter according to the estimated phase offset value from the upper/lower decoding means; and a phase offset outputting unit for outputting the phase offset value estimated through the upper decoding unit and the de-interleaving unit.

摘要翻译： 提供了一种用于估计多个存活路径的相位偏移的装置和使用其的卫星通信系统。 该装置包括：上/下解码单元，用于获得相位偏移估计值，并且基于从外部设备输入的先前状态的存储参数估计值来估计每个生存路径的相位偏移; 交织/解交织单元，用于根据来自上/下解码装置的估计相位偏移值，最小化用于估计参数的数据之间的相关性; 以及相位偏移输出单元，用于输出通过上部解码单元和解交织单元估计的相位偏移值。

公开(公告)号：US20060045137A1

公开(公告)日：2006-03-02

申请号：US11026957

申请日：2004-12-30

申请人： Pansoo Kim ,  Yun-Jeong Song ,  Soon-Ik Jeon ,  Deock-Gil Oh ,  Ho-Jin Lee

发明人： Pansoo Kim ,  Yun-Jeong Song ,  Soon-Ik Jeon ,  Deock-Gil Oh ,  Ho-Jin Lee

IPC分类号： H04J3/06

CPC分类号： H04L27/0014 ,  H04L2027/0028 ,  H04L2027/0048 ,  H04L2027/0065 ,  H04L2027/0069

摘要： Provided are an apparatus for estimating frequency offset from received signal and method for the same. The apparatus and method estimates frequency offset precisely without increment of autocorrelator by performing moving average filtering on a noised signal to thereby alleviate jitter. The frequency offset estimating apparatus includes: moving average filter for alleviating jitter of received signal; multiplier for multiplying a filtered signal by conjugate complex operanded pilot signal; phase-rotation value calculator for calculating a phase-rotation value from multiplicand operanded signal by using of symbol delay and an autocorrelation function; frequency offset estimator for estimating frequency offset from the phase-rotation value based on a smoothing function multiplication.

摘要翻译： 提供了一种用于从接收信号估计频率偏移的装置及其方法。 该装置和方法通过对噪声信号执行移动平均滤波来精确地估计频率偏移而不增加自相关器，从而减轻抖动。 频率偏移估计装置包括：移动平均滤波器，用于减轻接收信号的抖动; 乘法器，用于将经滤波的信号乘以共轭复运算导频信号; 相位旋转值计算器，用于通过使用符号延迟和自相关函数来从被乘数运算信号计算相位旋转值; 频率偏移估计器，用于基于平滑函数乘法估计相位旋转值的频率偏移。

公开(公告)号：US20050143003A1

公开(公告)日：2005-06-30

申请号：US10916965

申请日：2004-08-11

申请人： Ki-Dong Lee ,  Ho-Jin Lee ,  Ho-Kyom Kim ,  Deock-Gil Oh

发明人： Ki-Dong Lee ,  Ho-Jin Lee ,  Ho-Kyom Kim ,  Deock-Gil Oh

IPC分类号： H04B7/26 ,  H04B7/185 ,  H04Q7/20

CPC分类号： H04B7/18532

摘要： 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.

摘要翻译： 公开了一种用于控制数据传输速率的方法，以便在移动终端通过交互式卫星通信系统中的NLOS区域时节省由于非视线（NLOS）区域引起的资源浪费。 该方法包括以下步骤：设置至少一个阈值; 在网络控制中心（NCC）检测到卫星接入控制是否丢失之后，根据恒定资源分配（CRA）调整分配的资源; 如果所述移动终端在第一阈值持续时间内从所述NLOS区域返回，则通过重新分配来补偿传输延迟，其中所述移动终端在所述第一阈值持续时间期间保持所述精细同步状态; 并且如果移动终端在第一阈值持续时间内没有从NLOS区域返回，则释放基于CRA分配的所有资源。

公开(公告)号：US07286824B2

公开(公告)日：2007-10-23

申请号：US10916965

申请日：2004-08-11

申请人： Ki-Dong Lee ,  Ho-Jin Lee ,  Ho-Kyom Kim ,  Deock-Gil Oh

发明人： Ki-Dong Lee ,  Ho-Jin Lee ,  Ho-Kyom Kim ,  Deock-Gil Oh

IPC分类号： H04Q7/20

CPC分类号： H04B7/18532

摘要： 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.

摘要翻译： 公开了一种用于控制数据传输速率的方法，以便在移动终端通过交互式卫星通信系统中的NLOS区域时节省由于非视线（NLOS）区域引起的资源浪费。 该方法包括以下步骤：设置至少一个阈值; 在网络控制中心（NCC）检测到卫星接入控制是否丢失之后，根据恒定资源分配（CRA）调整分配的资源; 如果所述移动终端在第一阈值持续时间内从所述NLOS区域返回，则通过重新分配来补偿传输延迟，其中所述移动终端在所述第一阈值持续时间期间保持所述精细同步状态; 并且如果移动终端在第一阈值持续时间内没有从NLOS区域返回，则释放基于CRA分配的所有资源。