公开(公告)号：KR100461537B1

公开(公告)日：2004-12-17

申请号：KR1020020074480

申请日：2002-11-27

Applicant: 한국전자통신연구원

Inventor： 임광재 ,  김수영 ,  오덕길

IPC: H04B7/204 ,  H04W84/06

CPC classification number: H04B7/2041 ,  H04B7/216

Abstract: Provided are a packet transmission method for transmitting packets in a forward link of a multibeam satellite communication system and a computer-readable recording medium for recording a program that implements the method. The packet transmission method transmitting packets to mobile stations in a forward link of a multibeam satellite communication system, comprising the steps of: wherein downlink beams of a satellite share an orthogonal spreading code set for transmitting packets to the mobile stations, a) generating downlink beam signals by using an identical structure for the radio frames transmitted through the downlink beams and an identical pseudo-noise (PN) scrambling code for generating downlink beam signals; and b) synchronizing transmission timings of frames, symbols and spread chips on the downlink beam signals.

Abstract translation: 提供了一种用于在多波束卫星通信系统的前向链路中发送分组的分组传输方法以及用于记录实现该方法的程序的计算机可读记录介质。 在多波束卫星通信系统的前向链路中向移动站发送分组的分组传输方法包括以下步骤：其中卫星的下行波束共享用于向移动站发送分组的正交扩展码集，a）产生下行链路波束 信号通过使用相同的结构用于通过下行链路波束发送的无线电帧和用于产生下行链路波束信号的相同的伪噪声（PN）扰码; 和b）在下行链路波束信号上同步帧，码元和扩展码片的传输定时。

公开(公告)号：KR100457924B1

公开(公告)日：2004-11-18

申请号：KR1020020060990

申请日：2002-10-07

Applicant: 한국전자통신연구원

Inventor： 송윤정 ,  김영완 ,  김내수 ,  오덕길

IPC: H04L27/22

CPC classification number: H04L27/2273 ,  H04L27/3809 ,  H04L2027/0028 ,  H04L2027/0057

Abstract: Disclosed is a quadrature demodulator for high-speed wireless communication, which comprises: an A/D converter for converting received signals into digital signals; a signal recovery unit for recovering carriers and symbol timing from the signals converted by the A/D converter; a decision unit for detecting recovered signals output by the signal recovery unit, and performing a decision process on them; an I/Q gain imbalance detector for detecting gain imbalances of the I and Q-phase components from the recovered signals, and outputting an I/Q gain compensation value for compensating for the gain imbalances; and an I/Q gain compensator, provided between the A/D converter and the signal recovery unit, for reflecting the I/Q gain compensation value output by the I/Q gain imbalance detector to the received signals.

Abstract translation: 公开了一种用于高速无线通信的正交解调器，包括：A / D转换器，用于将接收信号转换成数字信号; 信号恢复单元，用于从由A / D转换器转换的信号中恢复载波和符号定时; 判定单元，用于检测由信号恢复单元输出的恢复信号，并对它们执行判定处理; I / Q增益不平衡检测器，用于从恢复的信号中检测I和Q相分量的增益不平衡，并输出用于补偿增益不平衡的I / Q增益补偿值; 以及I / Q增益补偿器，设置在A / D转换器和信号恢复单元之间，用于将由I / Q增益不平衡检测器输出的I / Q增益补偿值反映到接收信号。

公开(公告)号：KR100457188B1

公开(公告)日：2004-11-16

申请号：KR1020020061079

申请日：2002-10-07

Applicant: 한국전자통신연구원

Inventor： 최권휴 ,  김수영 ,  오덕길

IPC: H04B1/692

CPC classification number: H04L1/0071 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0033 ,  H04L1/08 ,  H04L5/026 ,  H04L27/0008 ,  H04L27/2602

Abstract: Provided are multi-carrier (MC)/multi-carrier direct sequence (MC-DS) dual-mode adaptable CDMA apparatus, the method thereof, and a computer program that implements the method. The apparatus can vary the user modulation degree and the transmission repetition degree independently, and convert a spreading scheme between the time-based spreading scheme (MC-DS-CDMA) and the frequency-based spreading scheme (MC-CDMA) in a MC-CDMA system. The apparatus includes: a user signal processing unit for performing symbol modulation, repetition and spreading of bit stream for each user based on a transmission mode suitable for channel environment of each user, and generating spread chip streams for the user; a combining unit for adding up all the spread chip streams for the users; a first interleaving unit for interleaving the chip streams added up in the combining unit and generating a first interleaved stream; and a second interleaving unit for optionally performing a second interleaving on the first interleaved stream.

Abstract translation: 提供了多载波（MC）/多载波直接序列（MC-DS）双模自适应CDMA设备，其方法以及实现该方法的计算机程序。 该设备可以独立地改变用户调制度和传输重复度，并且在基于时间的扩频方案（MC-DS-CDMA）和基于频率的扩频方案（MC-CDMA）之间转换扩频方案， CDMA系统。 该装置包括：用户信号处理单元，用于基于适合于每个用户的信道环境的传输模式为每个用户执行比特流的符号调制，重复和扩展，并且为用户生成扩展码片流; 合并单元，用于为用户累加所有扩展码片流; 第一交织单元，用于交织在合并单元中合并的码片流并产生第一交织流; 以及第二交织单元，用于可选地对第一交织流执行第二交织。

公开(公告)号：KR1020040051907A

公开(公告)日：2004-06-19

申请号：KR1020020079601

申请日：2002-12-13

Applicant: 한국전자통신연구원

Inventor： 최승남 ,  김내수 ,  오덕길

IPC: H04L12/28

CPC classification number: H04L12/5601 ,  H04L2012/5608 ,  H04Q11/0478

Abstract: PURPOSE: A satellite ATM interworking apparatus and an implementing method thereof are provided to simultaneously transmit video and Internet-related signals by a satellite as well as an ATM signal of a terrestrial network according to interworking between a satellite and the terrestrial network. CONSTITUTION: The first ATM constituting unit connected to the first terrestrial ATM network outputs ATM cell data. The second ATM constituting unit connected to the second terrestrial ATM network outputs ATM cell data. An MPEG constituting unit generates video signals of a transport stream according to MPEG(Moving Picture Experts Group)-2 standards as ATM cell data. An IPoA constituting unit generates ethernet frame data as ATM cell data and outputs it. A link enhancing unit adaptively corrects an error according to a state of a phase channel. An ATM layer processor multiplexes generated ATM cell data and outputs it to the link enhancing unit.

Abstract translation: 目的：提供一种卫星ATM互通设备及其实现方法，以便根据卫星与地面网络之间的互通，同时通过卫星以及地面网络的ATM信号同时发送视频和因特网相关信号。 构成：连接到第一地面ATM网络的第一个ATM构成单元输出ATM信元数据。 连接到第二地面ATM网络的第二ATM构成单元输出ATM信元数据。 MPEG构成单元根据MPEG（运动图像专家组）-2标准生成作为ATM信元数据的传输流的视频信号。 IPoA构成单元生成以太网帧数据作为ATM信元数据并输出。 链路增强单元根据相位通道的状态自适应地校正错误。 ATM层处理器复用生成的ATM信元数据并将其输出到链路增强单元。

公开(公告)号：KR1020040036821A

公开(公告)日：2004-05-03

申请号：KR1020020065490

申请日：2002-10-25

Applicant: 한국전자통신연구원

Inventor： 임광재 ,  김수영 ,  오덕길

IPC: H04J13/16

CPC classification number: H04L5/026

Abstract: PURPOSE: A spreading/despreading system and method in an MC-CDMA(Multicarrier-Code Division Multiple Access) are provided to easily implement two-dimensional time/frequency spreading and variable spread rate of a direct spreading/despreading and multicarrier spreading/despreading. CONSTITUTION: A symbol repeating unit repeats each symbol of a modulation symbol stream inputted for spreading during a process of forming a signal of MC-CDMA as many as the repetition number(R) which is determined according to a variable spread rate. A spreading unit directly spreads the repeated symbols by using a spread code having the same chip rate as the symbol rate, and a demultiplexer separates the spread symbols to parallel chip streams as many as the multicarrier through serial/parallel conversion by a serial/parallel converter(52). An inverse frequency converter carries each separated chip on corresponding subcarriers and transmits it to a receiving side through an IFFT(Inverse Fast Fourier Transform) by an IFFT(Inverse Fast Fourier Transform) unit(53).

Abstract translation: 目的：提供MC-CDMA（多载波码分多址）中的扩频/解扩系统和方法，以便于实现直接扩频/解扩和多载波扩展/解扩的二维时间/频率扩展和可变扩展速率。 构成：符号重复单元在形成MC-CDMA的信号的处理期间重复输入的用于扩频的调制符号流的每个符号，与根据可变扩展速率确定的重复次数（R）一样多。 扩展单元通过使用具有与码元速率相同的码片速率的扩展码来直接扩展重复符号，并且解复用器通过串行/并行转换器通过串行/并行转换将扩展符号分离成与多载波一样多的并行码片流 （52）。 逆频率转换器将每个分离的芯片携带在相应的子载波上，并通过IFFT（快速傅里叶逆变换）单元（53）通过IFFT（快速傅里叶逆变换）将其发送到接收侧。

公开(公告)号：KR1020040031529A

公开(公告)日：2004-04-13

申请号：KR1020020061079

申请日：2002-10-07

Applicant: 한국전자통신연구원

Inventor： 최권휴 ,  김수영 ,  오덕길

IPC: H04B1/692

CPC classification number: H04L1/0071 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0033 ,  H04L1/08 ,  H04L5/026 ,  H04L27/0008 ,  H04L27/2602

Abstract: PURPOSE: An adaptive MC(Multi-Carrier)-CDMA device capable of performing a direct sequence conversion function is provided to independently vary reciprocal conversions between an MC-DS(Direct Sequence) CDMA system and an MC-CDMA system as well as each user modulation degree and a repeated transmission degree, thereby reducing an additional signal processing. CONSTITUTION: A user signal processor performs symbol modulation, repetition, and spread processes according to transmission methods appropriate for channel environments of each user relating to bit strings of each user. A synthesizer(210) synthesizes all chip strings of the users. The first interleaving processor(211) receives the added chip strings, and performs an interleaving process. The second interleaving processor(212) selectively performs an additional interleaving process for a signal transmitted from the first interleaving processor(211), depending on whether a determined direct sequence system is an MC-DS CDMA system or an MC-CDMA system.

Abstract translation: 目的：提供能够执行直接序列转换功能的自适应MC（多载波）-CDMA设备，以独立地改变MC-DS（直接序列）CDMA系统和MC-CDMA系统之间的倒数转换以及每个用户 调制度和重复传输程度，从而减少额外的信号处理。 构成：用户信号处理器根据适合每个用户与每个用户的位串有关的信道环境的传输方法执行符号调制，重复和扩展处理。 合成器（210）合成用户的所有芯片串。 第一交织处理器（211）接收所添加的码片串，并执行交织处理。 第二交错处理器（212）根据确定的直接序列系统是MC-DS CDMA系统还是MC-CDMA系统，选择性地对从第一交织处理器（211）发送的信号执行附加交织处理。

公开(公告)号：KR1020040031521A

公开(公告)日：2004-04-13

申请号：KR1020020060989

申请日：2002-10-07

Applicant: 한국전자통신연구원

Inventor： 최권휴 ,  김수영 ,  임광재 ,  오덕길

IPC: H04B1/7103

CPC classification number: H04L5/026

Abstract: PURPOSE: A system for generating a channel transmission symbol in a multi-carrier communication system is provided to divide users into 2 groups, and to apply offsets to symbol timing between the user groups, then to generate a symbol transition of other user groups, thereby reducing multi-interference components included in symbol decision variables. CONSTITUTION: A user grouping unit(201) divides users into many groups. A code spreading unit(202) assigns different orthogonal codes to data symbols of each group user, and spreads signals. An interleaver(203) interleaves chip signals of each group user into the data symbols. A serial/parallel converter(205) converts interleaved signals in parallel transmission data type. An IFFT unit(206) sequentially performs an IFFT process for each group user signal converted from the serial/parallel converter(205), generates multi-carrier output signals, and outputs the multi-carrier output signals. A parallel/serial converter(207) converts the converted signals in serial transmission data type. A guard time insertion unit(208) inserts guard time into the converted signals. A symbol timing offset delayer(209) delays the group user signals, and differently sets symbol timing between the user groups.

Abstract translation: 目的：提供一种用于在多载波通信系统中生成信道传输符号的系统，以将用户划分为2组，并对用户组之间的符号定时应用偏移量，从而生成其他用户组的符号转换 减少符号决定变量中包含的多干扰成分。 构成：用户分组单元（201）将用户分成许多组。 代码扩展单元（202）将不同的正交码分配给每个组用户的数据符号，并且传播信号。 交织器（203）将每个组用户的码片信号交织成数据符号。 串行/并行转换器（205）以并行传输数据类型转换交错信号。 IFFT单元（206）对从串行/并行转换器（205）转换的每个组用户信号顺序执行IFFT处理，生成多载波输出信号，并输出多载波输出信号。 并行/串行转换器（207）以串行传输数据类型转换转换的信号。 保护时间插入单元（208）将保护时间插入到转换的信号中。 符号定时偏移延迟器（209）延迟组用户信号，并且不同地设置用户组之间的符号定时。

公开(公告)号：KR100392253B1

公开(公告)日：2003-07-23

申请号：KR1020000077633

申请日：2000-12-18

Applicant: 한국전자통신연구원

Inventor： 표철식 ,  이종문 ,  윤영근 ,  오덕길

IPC: H04B7/195

Abstract: PURPOSE: An active antenna apparatus for the mobile reception of a multi satellite signal and the chasing method are provided to receive the satellite signal of an another different polarization and receive the desired satellite signal in moving under the existence of the multi satellite signal having same polarization and frequency. CONSTITUTION: A radome(1) protects the system from the outside. A radiation module(2) can receive an electric wave of double polarized wave and a multiple satellite signal. The multiple satellite signal is inputted to the radiation module(2) passing through the radome(1). An active channel module(3) amplifies the received satellite signal as a low noise. A beam formation module(4) controls the phase of a phase displacement device. A multiple satellite chasing controller(9) controls the chasing of the desired polarized satellite signal among the multiple satellite signal when moving.

Abstract translation: 目的：提供一种用于移动接收多卫星信号的有源天线装置和追踪方法，用于接收另一种不同极化的卫星信号，并在存在具有相同极化的多卫星信号的情况下接收所需的卫星信号 和频率。 构成：天线罩（1）保护系统不受外界影响。 辐射模块（2）可以接收双极化波和多个卫星信号的电波。 多个卫星信号输入到通过天线罩（1）的辐射模块（2）。 有源信道模块（3）将接收到的卫星信号放大为低噪声。 光束形成模块（4）控制相移装置的相位。 多卫星追踪控制器（9）在移动时控制多卫星信号中期望的极化卫星信号的追踪。

公开(公告)号：KR100358106B1

公开(公告)日：2002-10-25

申请号：KR1019990061886

申请日：1999-12-24

Applicant: 한국전자통신연구원

Inventor： 표철식 ,  전순익 ,  오덕길

IPC: H01Q15/00

Abstract: 1. 청구범위에기재된발명이속한기술분야본 발명은이동체위성통신용위상배열안테나시스템에관한것임. 2. 발명이해결하려고하는기술적과제본 발명은, 위상배열안테나시스템에서주파수에따라안테나의빔 지향방향이달라지는위상배열안테나의근본적인현상때문에발생하는안테나의추적손실문제점을해결하기위하여제안된것으로, 정지궤도위성을이용한이동체위성통신을위해필요로하는고이득, 넓은전자적빔제어, 고속위성추적이가능한송수신능동위상배열안테나시스템및 위성추적을위한빔 제어방법과상기방법을실현시키기위한프로그램을기록한컴퓨터로읽을수 있는기록매체를제공하고자함. 3. 발명의해결방법의요지본 발명은, 이동위성통신용능동위상배열안테나시스템에있어서, 수신신호분배기로부터입력되는다수채널마다위상천이기를통과시켜신호를성형하는수신채널신호빔 성형수단; 상기수신신호분배기로부터전송된다수채널의수신신호를소정의그룹으로결합한후 위상천이기를통과시켜신호를성형하는추적신호빔 성형수단; 상기추적신호빔 성형수단에의해성형된추적신호의크기를검출하는추적신호검출수단; 상기추적신호검출수단에의해검출된신호세기를기준으로추적신호의빔에대한위성지향오차를계산하고, 추적신호의빔에대한위성지향오차를기준으로수신채널신호의빔과송신신호의빔에대한위성지향오차를계산하는위성추적처리수단; 상기위성추적처리수단으로부터입력된추적신호빔의위성지향오차로부터위상변화값을계산하고, 이를바탕으로수신안테나내부각 위상천이기의위상값을계산한후, 위상값으로각 위상천이기의위상을제어해추적주파수신호가최대가되도록추적주파수지향방향을제어하는추적빔제어수단; 상기위성추적처리수단으로부터입력된수신채널신호빔의위성지향오차로부터위상변화값을계산한후, 이를바탕으로상기수신채널신호빔 성형수단내부위상천이기의각 위상값을계산한후, 위상값으로위상천이기의위상을제어해출력되는빔의방향이수신주파수에서최대가되도록하여추적손실을보상하는수신채널빔 제어수단; 및상기위성추적처리수단으로부터입력된송신신호빔의위성지향오차로부터위상변화값을계산하고, 이를바탕으로송신안테나내부각 위상천이기의위상값을계산한후, 위상값으로각 위상천이기의위상을제어해송신안테나의빔을제어하여상기송신안테나에서의지향오차를보상하는송신빔제어수단을포함함. 4. 발명의중요한용도이동위성통신용능동위상배열안테나시스템등에이용됨.

公开(公告)号：KR1020020054195A

公开(公告)日：2002-07-06

申请号：KR1020000083017

申请日：2000-12-27

Applicant: 한국전자통신연구원

Inventor： 최은아 ,  김진호 ,  김내수 ,  오덕길

IPC: H03M13/41

CPC classification number: H03M13/6362 ,  H03M13/395 ,  H03M13/3961 ,  H03M13/41 ,  H03M13/4107

Abstract: PURPOSE: A depuncture structure for radix-4 branch metric operation in high-rate viterbi decoder and a method of the same are provided to enable a depuncture for a radix-4 branch metric operation of all punctured codes simply by using a clock a rate of which is equal to a clock rate of an inputted I, Q bit stream. CONSTITUTION: A first and a second FIFO(First In First Out)(110) store an I-signal sequentially. A third and a fourth FIFO(110) store a Q-signal sequentially. A first and a second multiplexor(120) multiplex a signal inputted from the first and the third FIFO(110). A third and a fourth multiplexor(120) multiplex a signal inputted from the second and the fourth FIFO(110). A first radix-2 branch metric calculator(130) performs a depuncture function about a signal inputted from the first and the second multiplexor(120). A second radix-2 branch metric calculator(130) performs a depuncture function about a signal inputted from the third and the fourth multiplexor(120).

Abstract translation: 目的：提供一种用于高速率维特比解码器中的基数4分支度量操作的解穿孔结构及其方法，以便能够简单地通过使用时钟的速率来实现针对所有穿孔码的基4分支度量操作 其等于输入的I，Q比特流的时钟速率。 构成：第一和第二FIFO（先进先出）（110）依次存储I信号。 第三和第四FIFO（110）依次存储Q信号。 第一和第二多路复用器（120）对从第一和第三FIFO（110）输入的信号进行复用。 第三和第四多路复用器（120）对从第二和第四FIFO（110）输入的信号进行复用。 第一基数-2分支度量计算器（130）执行关于从第一和第二多路复用器（120）输入的信号的解穿孔功能。 第二基数-2分支度量计算器（130）执行关于从第三和第四多路复用器（120）输入的信号的去穿刺功能。