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    • 1. 发明申请
    • Blind modulation classification apparatus for use in satellite communication system and method thereof
    • 用于卫星通信系统的盲调制分类装置及其方法
    • US20060115013A1
    • 2006-06-01
    • US11184592
    • 2005-07-19
    • Il KimHo-Kyom KimDeock-Gil OhHo-Jin Lee
    • Il KimHo-Kyom KimDeock-Gil OhHo-Jin Lee
    • H04L23/02
    • H04L27/0012
    • 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.
    • 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。
    • 2. 发明授权
    • Method for controlling data transmission rate in interactive satellite communication system
    • 交互式卫星通信系统中数据传输速率的控制方法
    • US07286824B2
    • 2007-10-23
    • US10916965
    • 2004-08-11
    • Ki-Dong LeeHo-Jin LeeHo-Kyom KimDeock-Gil Oh
    • Ki-Dong LeeHo-Jin LeeHo-Kyom KimDeock-Gil Oh
    • H04Q7/20
    • H04B7/18532
    • 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。
    • 3. 发明申请
    • Method for controlling data transmission rate in interactive satellite communication system
    • 交互式卫星通信系统中数据传输速率的控制方法
    • US20050143003A1
    • 2005-06-30
    • US10916965
    • 2004-08-11
    • Ki-Dong LeeHo-Jin LeeHo-Kyom KimDeock-Gil Oh
    • Ki-Dong LeeHo-Jin LeeHo-Kyom KimDeock-Gil Oh
    • H04B7/26H04B7/185H04Q7/20
    • H04B7/18532
    • 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。
    • 4. 发明授权
    • Apparatus for allocating resources in DAMA satellite communication system and method thereof
    • 用于在DAMA卫星通信系统中分配资源的装置及其方法
    • US07782823B2
    • 2010-08-24
    • US11305587
    • 2005-12-16
    • Ki-Dong LeeDeock-Gil OhHo-Jin Lee
    • Ki-Dong LeeDeock-Gil OhHo-Jin Lee
    • H04Q7/00
    • H04L41/0896H04W28/20
    • 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.
    • 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。
    • 5. 发明授权
    • Apparatus and method for acquiring frame synchronization and frequency synchronization simultaneously in communication system
    • 在通信系统中同时获取帧同步和频率同步的装置和方法
    • US08259646B2
    • 2012-09-04
    • US12517432
    • 2007-12-03
    • Pan-Soo KimDae-Ig JangDeock-Gil OhHo-Jin Lee
    • Pan-Soo KimDae-Ig JangDeock-Gil OhHo-Jin Lee
    • H04J3/06
    • H04L7/042H04L7/046H04L27/0014H04L2027/003
    • 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.
    • 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。