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公开(公告)号：KR1020060043279A
公开(公告)日：2006-05-15
申请号：KR1020050016809
申请日：2005-02-28
Applicant: 한국전자통신연구원 , 아주대학교산학협력단
CPC classification number: H04B7/02 , H04B7/0697 , H04L1/0612 , H04B7/0656
Abstract: 본 발명은 구조적인 시공간 부호 및 그 생성 방법과, 그 시공간 부호를 사용한 다중 안테나 시스템에 관한 것이다. 이 시공간 부호는 하나의 블록구간 동안 송신기의 안테나 개수와 공간 다중화율의 곱에 해당하는 심벌들을 전송하도록 송신기의 안테나 개수에 해당하는 크기의 정방행렬인 부호어 행렬－여기서 부호어 행렬의 행(row)은 송신기의 안테나별로 전송되는 결합된 신호들을 나타내고, 부호어 행렬의 열(column)은 송신기의 안테나 개수에 해당하는 타임슬롯을 나타냄－을 가진다. 이 부호어 행렬은 타임슬롯마다 각 송신 안테나가 전송하도록 할당되는 심벌의 개수는 공간 다중화율에 해당하는 개수이고, 각 송신 안테나에 할당된 심벌들은 서로 다른 결합 계수들에 의해 결합되어 각 송신 안테나에 의해 동시에 전송되며, 각 송신 안테나에는 타임슬롯마다 서로 다른 심벌들이 할당되도록 결정된다. 본 발명에 따르면, 최소의 지연을 가지므로 채널변화에 효과적으로 대처할 수 있고, 타임슬롯별 안테나별로 최소의 데이터 심벌의 조합으로 신호가 생성되므로 신호들 간의 유클리디언 거리가 커서 높은 부호화 이득을 얻을 수 있다.
시공간 부호, STC, time space code, 다중 안테나 시스템, 공간 다중화율Abstract translation: 本发明涉及结构空时码，用于生成空时码的方法以及使用该空时码的多天线系统。 空间 - 时间码是在发射器和空间复用率乘以码字矩阵的平方矩阵，其中的一个发射机的天线数来发送码元的过尺寸的天线的块周期数 - 其中所述码字矩阵的行（行 表示由发射机的天线发送的组合信号，并且码字矩阵的列表示与发射机的天线的数量相对应的时隙。 码字矩阵是被分配给针对每个时隙传送每个发射天线的符号的数目是对应于所述空间复用率的数量，由符号组合是不同的耦合系数被分配给每个发送天线的每个发送天线 并且确定对于每个时隙将不同的符号分配给每个发射天线。 根据本发明，因为最小延迟，以有效地进行信道改变响应，以及时隙天线作为信号的通过组合生成的数据码元的最小数量是信号的光标之间的欧几里德距离，以获得用于每个特定高的编码增益 有。
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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
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。
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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
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。
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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
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。
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公开(公告)号：KR1020030033977A
公开(公告)日：2003-05-01
申请号：KR1020020064673
申请日：2002-10-22
Applicant: 한국전자통신연구원
IPC: H04B7/02
CPC classification number: H04B7/18534 , H04W52/40 , H04B7/18543 , H04W52/146
Abstract: PURPOSE: A method for controlling beam selection diversity transmission power of a satellite mobile communication system is provided to reduce interference due to multi-beam transmission upon inter-beam soft hand-over, so as to increase the capacity of a downward link and reduce the probability in beam selection failure due to propagation delay and a fast state change of a channel upon beam selection. CONSTITUTION: A satellite network allocates temporary recognition numbers to each active beam included in an active set(S301), and receives a recognition number of main beam using feedback information from a user terminal(S303). The temporary recognition numbers of each active beam are periodically compared with the recognition number of the main beam(S305). Uplink receiving signal quality values of each active beam are compared with a preset threshold(S307). If the recognitions numbers are different each other in the step S305 and the uplink receiving signal quality value of the corresponding active beam is larger than the threshold in the step S307, the corresponding active beam is decided as sub beam at a corresponding cycle(S309). The satellite network cuts off data transmission power of the corresponding beam(S313). If the recognitions numbers are equal each other in the step S305 and the uplink receiving signal quality value of the corresponding active beam is not larger than the threshold in the step S307, the corresponding active beam is decided as main beam at a corresponding cycle(S311). The satellite network maintains data transmission power of the corresponding beam(S315). The satellite network decides whether an ending signal is received from an upper layer(S317). If so, the steps are ended, and if not, the step S303 is returned.
Abstract translation: 目的：提供一种用于控制卫星移动通信系统的波束选择分集发射功率的方法，以减少在光束间切换时由于多波束传输引起的干扰，从而增加下行链路的容量，并减少 由于传播延迟导致波束选择失败的概率以及波束选择时信道的快速状态变化。 构成：卫星网络向包括在活动集合中的每个活动波束分配临时识别号码（S301），并且使用来自用户终端的反馈信息接收主波束的识别号码（S303）。 周期性地将每个有源波束的临时识别号与主波束的识别号进行比较（S305）。 将每个有源波束的上行链路接收信号质量值与预设阈值进行比较（S307）。 如果步骤S305中的识别号码彼此不同，并且在步骤S307中相应的有源波束的上行链路接收信号质量值大于阈值，则相应的有源波束在相应的周期被确定为子波束（S309） 。 卫星网络切断相应波束的数据传输功率（S313）。 如果步骤S305中的识别号码彼此相等，并且在步骤S307中相应的有源波束的上行链路接收信号质量值不大于阈值，则相应的有源波束被确定为相应周期的主波束（S311 ）。 卫星网络保持相应波束的数据传输功率（S315）。 卫星网络决定是否从上层接收到结束信号（S317）。 如果是，则结束步骤，否则返回步骤S303。
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Patent Agency Ranking
公开(公告)号：KR1020010076756A
公开(公告)日：2001-08-16
申请号：KR1020000004111
申请日：2000-01-28
Applicant: 한국전자통신연구원
IPC: H04B17/00
CPC classification number: H04B17/336 , H04L1/0026
Abstract: PURPOSE: A method for predicting the level of a receiving signal in an adaptive transmitting system is provided to predict the level of the receiving signal with a simple calculation by predicting the future value with the present value and the variation between the past value and the present value. CONSTITUTION: If a sample of signal to noise ratio for receiving is inputted(S22), a low pass filtering is performed to remove the rapid variation of the signal to noise ratio for receiving(S23). The level of the signal to noise ratio after a predetermined time is predicted by the variation of the filtered signal to noise ratio(S24). An average prediction error is calculated by the real value and the predicted value of the signal to noise ratio, and the predicted value is corrected by the average prediction error(S25). A prediction margin is added in the predicted value(S27).
Abstract translation: 目的：提供一种用于预测自适应发射系统中接收信号电平的方法，通过简单的计算来预测接收信号的电平，通过使用当前值预测未来值和过去值与现在值之间的变化 值。 构成：如果输入用于接收的信噪比的样本（S22），则执行低通滤波以消除用于接收的信噪比的快速变化（S23）。 通过滤波信噪比的变化来预测预定时间之后的信噪比的电平（S24）。 通过实际值和信噪比的预测值来计算平均预测误差，并且通过平均预测误差校正预测值（S25）。 在预测值中添加预测余量（S27）。
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公开(公告)号：KR101840793B1
公开(公告)日：2018-05-08
申请号：KR1020110130540
申请日：2011-12-07
Applicant: 한국전자통신연구원
Abstract: 무선통신시스템의메쉬노드는자신의전송범위내로진입하는진입노드를감지하면, 복수의이웃노드중에서진입노드와자신노드를모두이웃노드로가지는에이전트노드를선택하여, 에이전트노드를통해서진입노드와링크를형성한다. 또한메쉬노드는복수의이웃노드중 전송범위를벗어나는진출노드를감지하면형성되어있던링크를삭제하고삭제한링크를포함하는연결의전체경로중 적어도일부에대한대체경로를형성한다.
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