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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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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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Patent Agency Ranking
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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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公开(公告)号：KR1020170054990A
公开(公告)日：2017-05-18
申请号：KR1020160143635
申请日：2016-10-31
Applicant: 한국전자통신연구원
Abstract: 이동통신시스템에서의송신장치가서브프레임을구성하는방법이제공되며, 서브프레임구성방법은하향링크의제어정보를전달하는하향링크제어정보전송구간, 데이터를전송하는데이터전송구간, 상향링크의제어정보를전달하는상향링크제어정보전송구간및 데이터수신에대한응답신호를전송하는응답신호전송구간으로구성된서브프레임을구성하는단계, 그리고상기서브프레임을전송하는단계를포함한다.
Abstract translation: 本发明提供一种移动通信系统中发送装置中的子帧构建方法，该子帧配置方法包括下行控制信息传输间隔，用于传输下行控制信息，传输数据的数据传输间隔， 以及用于发送用于数据接收的响应信号并发送该子帧的响应信号发送间隔。
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公开(公告)号：KR1020170051187A
公开(公告)日：2017-05-11
申请号：KR1020160088274
申请日：2016-07-12
Applicant: 한국전자통신연구원
Inventor： 임광재
Abstract: 기지국의전송방법이제공된다. 상기기지국은, 상기기지국과단말간의전파지연시간을측정한다. 상기기지국은, 상기전파지연시간에기초해, 상기단말을위한제1 심볼의길이를결정한다. 그리고상기기지국은, 상기결정된길이를가지는상기제1 심볼을, 하향링크전송구간과상향링크수신구간사이에존재하는보호구간(guard period)에서전송한다.
Abstract translation: 提供了一种基站的传输方法。 基站测量基站和终端之间的传播延迟时间。 基站基于传播延迟时间确定终端的第一符号的长度。 基站在存在于下行链路发送间隔和上行链路接收间隔之间的保护时段中发送具有确定长度的第一符号。
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