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公开(公告)号：KR1020100072594A
公开(公告)日：2010-07-01
申请号：KR1020080131040
申请日：2008-12-22
Applicant: 한국전자통신연구원
IPC: H04L27/16
CPC classification number: H04L27/16 , H04L27/148
Abstract: PURPOSE: A method for compensating a frequency offset in an uplink cable modem and a device thereof are provided to easily and efficiently compensate the remaining frequency offset by using preamble included in an input signal and payload. CONSTITUTION: A phase detector(321) detects the phase of a second input signal previously inputted a first input signal. A low pass filter(322) filters low range the phase of the detected second input signal. A numerically controlled oscillator(323) generates the sine value and cos from the second input signal which is the low band filtering. A conjugate complex number(324) generates feedback data by computing the produced sine value cos and the conjugate value. A first multiply operator(325) outputs the compensation value by performing a multiple operation the received first input signal and feedback data.
Abstract translation: 目的：提供一种用于补偿上行链路电缆调制解调器及其装置中的频率偏移的方法，以便通过使用包括在输入信号和有效载荷中的前导码来容易且有效地补偿剩余的频率偏移。 构成：相位检测器（321）检测先前输入的第一输入信号的第二输入信号的相位。 低通滤波器（322）对检测到的第二输入信号的相位进行低通滤波。 数控振荡器（323）从作为低频带滤波的第二输入信号产生正弦值和cos。 共轭复数（324）通过计算产生的正弦值cos和共轭值来产生反馈数据。 第一乘法运算器（325）通过对接收的第一输入信号和反馈数据执行多次操作来输出补偿值。
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公开(公告)号：KR1020100069382A
公开(公告)日：2010-06-24
申请号：KR1020080128050
申请日：2008-12-16
Applicant: 한국전자통신연구원
IPC: H04N21/6334 , H04L9/14 , H04N7/10
CPC classification number: H04L9/0891 , G06F21/72 , G06F2221/2151 , H04L9/12 , H04L63/068 , H04L2463/062
Abstract: PURPOSE: A TEK updating device and a method thereof are provided to reduce communications overhead by periodically updating TEK used for a traffic encryption in a DOCSIS(Data Over Cable Service Interface Specification) system. CONSTITUTION: A TEK(Traffic Encryption Key) updating time calculation part(130) calculates TEK updating time by using the calculated time offset value, termination time of previously generated TEK, transmission time point information of a key response message through a system sync between a cable modem terminal system and a cable modem. The key response message comprises the TEK. A TEK updater(140) updates the TEK by applying the TEK updating time and the previously generated TEK to a hash function.
Abstract translation: 目的：提供TEK更新装置及其方法，以通过在DOCSIS（Data Over Cable Service Interface Specification）数据系统中周期性地更新用于业务加密的TEK来减少通信开销。 构成：TEK（交通加密密钥）更新时间计算部分130利用计算出的时间偏移值，先前生成的TEK的终止时间，密钥响应消息的传输时间点信息，通过系统同步，计算TEK更新时间 电缆调制解调器终端系统和电缆调制解调器。 密钥响应消息包括TEK。 TEK更新器（140）通过将TEK更新时间和先前生成的TEK应用于散列函数来更新TEK。
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公开(公告)号：KR100956257B1
公开(公告)日：2010-05-06
申请号：KR1020070129683
申请日：2007-12-13
Applicant: 한국전자통신연구원
Abstract: 본 발명은 케이블 모뎀에서 위상 지터를 제거하기 위한 장치 및 방법에 관한 것으로, 입력신호의 이득이 기설정한 값으로 수렴하도록 제어한 이득 제어한 신호와 저역통과필터(LPF : Low Pass Filter)를 통해 조절된 신호의 변화량을 출력하는 자동이득 제어장치; 및, 상기 이득 제어한 신호를 저장된 위상옵셋을 이용하여 보정하고 보정한 신호를 상기 신호의 변화량으로 나누어서 위상 지터(Phase jitter)를 제거하는 반송파 복원 장치를 포함한다.
위상 지터, 케이블 모뎀, 자동 이득제어, 반송파 복원-
公开(公告)号：KR100923163B1
公开(公告)日：2009-10-23
申请号：KR1020070107683
申请日：2007-10-25
Applicant: 한국전자통신연구원
CPC classification number: H04N21/4382 , H04L12/2801 , H04N7/104 , H04N21/2383 , H04N21/438 , H04N21/6118 , H04N21/64784
Abstract: Provided is a channel bonding receiving apparatus and method for expanding a channel bonding receiving band in a cable modem. The channel bonding receiving apparatus includes a channel bonding dividing unit for dividing a channel bonding broadband signal into a plurality of band signals and extracting a corresponding channel bonding signal from each of the divided band signals; and a channel routing unit for routing each of the extracted channel bonding signals to a corresponding demodulator.
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公开(公告)号：KR100908104B1
公开(公告)日：2009-07-16
申请号：KR1020070047568
申请日：2007-05-16
Applicant: 한국전자통신연구원
Abstract: 본 발명은 사용자 그룹 집합(US : User group Set)과 제공자 그룹 집합(RS : Resource group Set) 간의 제1 계층적 결합의 중복 비율(Redundancy rate)에 상응하여 결합 모드를 결정하는 단계, 상기 결정된 결합 모드에 상응하여 상기 사용자 그룹 집합(US)의 각 사용자 그룹(USn)마다 할당된 사용자 그룹 키(UGK) 또는 상기 제공자 그룹 집합(RS)의 각 제공자 그룹 (Rm)마다 할당된 리소스 키(RK)를 근원(root)으로 하여 복수의 제2 계층적 결합을 생성하는 단계, 상기 생성된 복수의 제2 계층적 결합에서 서로 중복된 노드를 제거하는 단계 및 상기 중복된 노드를 제거한 상기 복수의 제2 계층적 결합을 합성하여 상기 사용자 그룹 집합(US)과 제공자 그룹 집합(RS) 간의 제3 계층적 결합을 형성하는 단계를 포함하는 사용자 그룹과 제공자 그룹의 계층적 네트워크 결합 방법을 제공한다.
계층적 결합, 키 모델Abstract translation: 提供用户组和资源组之间的分层网络连接的方法和装置，以最小化密钥信息的成本值，同时保持用户组和资源组之间的分层连接关系中的前向保密和后向保密 。 用户组和资源组之间的分层网络连接的方法包括以下几个步骤。 分级网络连接装置在用户组和资源组之间建立分级连接（501）。 然后，该装置确定分层连接的冗余（503）。 此时，设备可以从用户组或资源组的视图中确定冗余（505,507）。 该装置确定用户组的视图与资源组的视图之间的哪一个导致较高的冗余（509）。 该设备根据所确定的用户组或资源组的视图通过星形图形成分层连接（511）。 该装置在合成每个分层连接时消除冗余（513）。 该装置最终完成整个网络的分层连接关系（515）。
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Patent Agency Ranking
公开(公告)号：KR1020090054099A
公开(公告)日：2009-05-29
申请号：KR1020070120796
申请日：2007-11-26
Applicant: 한국전자통신연구원
IPC: H04L12/20
CPC classification number: H04L12/2801 , H04L12/2863 , H04L25/14
Abstract: 본 발명은 케이블 모뎀에서 중간 주파수를 제어하는 수신 장치 및 방법에 관한 것으로, 광대역 신호를 수신하여 수신한 광대역 신호 전체를 튜닝하여 출력하는 광대역 RF(Radio Frequency) 튜너; 상기 광대역 RF 튜너로부터 수신하는 튜닝된 신호를 다수의 신호로 분배하고 분배한 신호 각각을 주파수 하향하고 결합하여 출력하는 중간 주파수 제어부; 및, 상기 중간 주파수 제어부로부터 중간 주파수가 조정된 아날로근 신호를 수신하여 디지털 신호로 변환하는 아날로그 디지털 변환기를 포함하여 표본 추출 비율(sampling rate)이 상대적으로 낮은 아날로그 디지털 컨버터를 사용할 수 있는 효과를 가진다.
케이블 모뎀, 채널 본딩, 다운 컨버터, 중간 주파수-
公开(公告)号：KR100876560B1
公开(公告)日：2008-12-31
申请号：KR1020070044652
申请日：2007-05-08
Applicant: 한국전자통신연구원
Abstract: A QAM symbol demapping method for downstream transmission of a cable and a QAM symbol demapping apparatus thereof are provided to perform QAM symbol demapping for a 64 QAM mode and a 256 QAM mode and to restore a bit signal without using a memory in downstream transmission. A QAM symbol demapping method for downstream transmission of a cable comprises the following steps of: demodulating a converted symbol and dividing the demodulated symbol into a code bit of I and Q symbols corresponding to amplitude information and an absolute value of the I and Q symbols corresponding to bit information; extracting the amplitude information by changing positions of I and Q in the absolute value of the I and Q symbols; extracting set partitioning information by using an LSB(Least Significant Bit) of the I and Q symbols for the extracted amplitude information and the code bit of the I and Q symbols.
Abstract translation: 提供用于电缆的下行传输的QAM符号解映射方法及其QAM符号解映射设备，以对64 QAM模式和256 QAM模式执行QAM符号解映射，并且在下游传输中不使用存储器的情况下恢复比特信号。 一种用于电缆下行传输的QAM符号解映射方法，包括以下步骤：对经转换的符号进行解调，并将经解调的符号划分为对应于幅度信息的I和Q符号的码位，并且对应于I和Q符号的绝对值 比特信息; 通过改变I和Q符号的绝对值中的I和Q的位置来提取振幅信息; 通过使用I和Q符号的LSB（最低有效位）来提取集合分割信息，用于提取的幅度信息和I和Q符号的码位。
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公开(公告)号：KR1020080052142A
公开(公告)日：2008-06-11
申请号：KR1020070029509
申请日：2007-03-27
Applicant: 한국전자통신연구원
CPC classification number: H04L41/50 , H04L41/0896
Abstract: An apparatus and a method for controlling a transmission rate are provided to secure QOS(Quality Of Service) to users which have to receive services more than a predetermined level and set the maximum transmission rate to limit the transmission rate, thereby preventing the data overflow of an uplink sub receiving module buffer and minimizing the variation of throughput for the transmission rate of an uplink sub receiving module. An apparatus for controlling a transmission rate comprises a subscriber information table(406), a transmission rate calculating module(404), an uplink sub receiving module(402), and a memory(408). The subscriber information table stores information indicating that each subscriber is a guaranteed subscriber or a normal subscriber. The uplink sub receiving module receives uplink data from a cable modem, and initializes a temporary transmission rate stored in the memory as traffic information is received from the cable modem. The transmission rate calculating module determines a variation constant based on the traffic information received from the uplink sub receiving module, and updates the maximum transmission rate set to the cable modem on the basis of the variation constant. The transmission rate calculating module includes a transmission non-calculating module(404a), a transmission rate increasing module(404b), and a transmission rate decreasing module(404c). The transmission non-calculating module calculates a ratio of a currently allocated transmission rate and the required transmission rate of each terminal connected to the cable modem as the traffic information is received. The transmission rate increasing module and the transmission rate decreasing module determines the variation of a transmission rate in the each terminal on the basis of the traffic information and are selectively operated.
Abstract translation: 提供一种用于控制传输速率的装置和方法，用于将QOS（服务质量）确保给必须接收超过预定级别的服务的用户，并设置最大传输速率以限制传输速率，从而防止数据溢出 上行链路子接收模块缓冲器，并且最小化上行链路子接收模块的传输速率的吞吐量的变化。 用于控制传输速率的装置包括用户信息表（406），传输速率计算模块（404），上行链路子接收模块（402）和存储器（408）。 用户信息表存储指示每个用户是保证用户或普通用户的信息。 上行链路子接收模块从电缆调制解调器接收上行链路数据，并从电缆调制解调器接收到业务信息，初始化存储在存储器中的临时传输速率。 传输速率计算模块基于从上行链路子接收模块接收的业务信息来确定变化常数，并根据变化常数更新设置到电缆调制解调器的最大传输速率。 传输速率计算模块包括传输不计算模块（404a），传输速率增加模块（404b）和传输速率降低模块（404c）。 传输非计算模块计算当接收到交通信息时当前分配的传输速率和连接到电缆调制解调器的每个终端的所需传输速率的比率。 传输速率增加模块和传输速率降低模块基于交通信息确定每个终端中的传输速率的变化并且被选择性地操作。
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公开(公告)号：KR100816428B1
公开(公告)日：2008-03-25
申请号：KR1020070035521
申请日：2007-04-11
Applicant: 한국전자통신연구원
CPC classification number: H04L27/3881
Abstract: A symbol slicing method and a symbol slicing apparatus of a scalable QAM(quadrature amplitude modulation) type are provided to maintain low hardware complexity regardless of the increment of a QAM modulation order by a logic operation using a least significant bit and an overall integral part of a sampling signal for in-phase and quadrature phase axes to be sampled as a digital value. A symbol slicing method in a digital demodulator having a QAM(quadrature amplitude modulation) type comprises the steps of: obtaining a digital integer value by sampling a symbol signal on an in-phase axis or a quadrature phase axis, respectively(S410,S420); and extracting a symbol bit stream on the in-phase axis or the quadrature phase axis using an entire bit stream and a least significant bit value of the digital integer value(S450). The step of extracting the symbol bit stream is characterized by setting the least significant bit value among the entire bit stream as '1'(S430).
Abstract translation: 提供了可扩展QAM（正交幅度调制）类型的符号分片方法和符号分片装置，以便通过使用最低有效位和总体整体部分的逻辑运算来保持较低的硬件复杂度，而不管QAM调制阶数的增加如何 用于同相和正交相位轴的采样信号作为数字值进行采样。 具有QAM（正交幅度调制）类型的数字解调器中的符号分片方法包括以下步骤：通过分别在同相轴或正交相位轴上采样符号信号来获得数字整数值（S410，S420） ; 以及使用数字整数值的整个比特流和最低有效位值在同相轴或正交相位轴上提取符号比特流（S450）。 提取符号位流的步骤的特征在于将整个比特流中的最低有效位值设置为'1'（S430）。
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公开(公告)号：KR100760259B1
公开(公告)日：2007-09-19
申请号：KR1020060048233
申请日：2006-05-29
Applicant: 한국전자통신연구원
IPC: H04N21/4405 , H04N21/44
CPC classification number: H04N21/6143 , H04L69/08 , H04N21/2381 , H04N21/4381 , H04N21/6193 , H04N21/64307
Abstract: Provided is an apparatus and method for recombining multi-protocol encapsulation (MPE) packets. The apparatus includes the steps of: a buffer for buffering transport stream (TS) packets; a first memory for temporally storing residue data; a second memory for storing a residue data existence flag and length information of data; a MPE recombination processor for analyzing header information, storing the length information of an MPE packet, creating an asynchronous transfer mode (ATM) cell header, reading packet data, creating and outputting an ATM adaptive layer 0 (AALO-ATM) cell and the read packet data, updating the length information of the data, reading the residue data, reading insufficient data and creating an AALO-ATM cell; and a segmentation and reassemble (SAR) processor for buffering the AALO-ATM cell, and transporting the AALO-ATM cell.
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