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公开(公告)号：KR1020140068355A
公开(公告)日：2014-06-09
申请号：KR1020120135700
申请日：2012-11-28
Applicant: 한국전자통신연구원
CPC classification number: H04W74/0816
Abstract: The present invention relates to a method and an apparatus in which an automatic identification system (AIS) accesses a radio channel. The method of the present invention comprises the steps of: selecting a slot on which a packet is to be transmitted on at least one radio channel; temporarily sending a first carrier, which notifies other AISs that the selected slot has been selected by the AIS, on the selected slot in transmission mode; and detecting a second carrier transmitted by another device on the selected slot in reception mode after temporarily sending the first carrier. In accordance with the present invention, the AIS temporarily sends a first carrier, which notifies other AISs that a selected slot has been selected by the AIS, on the selected slot prior to the detection of a second carrier, and another AIS accessing the same slot detects the first carrier temporarily transmitted. Accordingly, a collision between channels can be avoided.
Abstract translation: 本发明涉及自动识别系统（AIS）访问无线电信道的方法和装置。 本发明的方法包括以下步骤：在至少一个无线电信道上选择要发送分组的时隙; 临时发送第一载波，其在传输模式下在所选择的时隙上通知其他AIS AIS所选择的时隙已经被AIS选择的时隙; 以及在临时发送所述第一载波之后，以接收模式检测由所述选定时隙上的另一设备发送的第二载波。 根据本发明，在检测到第二载波之前，AIS临时发送一个第一载波，该第一载波向其他AIS通知所选择的时隙已由AIS选择，另一个AIS访问相同的时隙 检测到临时发送的第一载波。 因此，可以避免通道之间的碰撞。
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公开(公告)号：KR1020140032664A
公开(公告)日：2014-03-17
申请号：KR1020120099227
申请日：2012-09-07
Applicant: 한국전자통신연구원
Abstract: The present invention relates to wireless communication, and more particularly, relates to a wireless communication method and a wireless communication apparatus for performing multi-hop relay communication with mobile stations such as ships by using a directional antenna in a maritime broadband wireless communication system. The present invention is characterized by including a first communication unit communicating with a first communication device of a counterpart for relaying a base station or a wireless signal, a second communication unit communicating with a second communication device of the counterpart, and a bridge for connecting the first communication unit with the second communication unit, wherein the first communication unit includes a first AP set, multiple APs in the first AP set are connected to directional antennas directed in mutually different directions, the second communication unit includes a second AP set, and multiple APs in the second AP set are connected to directional antennas directed in mutually different directions. [Reference numerals] (100) First communication unit; (110) Second communication unit; (120) Bridge; (130) Internal network of ship
Abstract translation: 本发明涉及无线通信，更具体地，涉及一种无线通信方法和无线通信装置，用于通过在海上宽带无线通信系统中使用定向天线来执行与船舶等移动站的多跳中继通信。 本发明的特征在于包括与第一通信设备通信的第一通信单元，用于中继基站或无线信号的第一通信设备，与对方的第二通信设备通信的第二通信单元，以及用于连接 第一通信单元，其中第一通信单元包括第一AP集合，第一AP集合中的多个AP被连接到以相互不同的方向指向的定向天线，第二通信单元包括第二AP集，多个 第二AP组中的AP连接到以相互不同方向指向的定向天线。 （附图标记）（100）第一通信单元; （110）第二通信单元; （120）桥; （130）船内内网
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公开(公告)号：KR1020140010624A
公开(公告)日：2014-01-27
申请号：KR1020120077114
申请日：2012-07-16
Applicant: 한국전자통신연구원
Abstract: A method and a device for maritime wireless communication are disclosed. The device for maritime wireless communication comprises a terrestrial network communication part for communicating with a terrestrial network; a maritime network communication part for communicating with a maritime network; and a communication control part for linking the communications between the terrestrial and maritime network communication parts based on the destination address of data which is supplied from the terrestrial or maritime network communication part. Therefore, terrestrial broadband wireless data communication services become available for the sea. [Reference numerals] (210) Terrestrial network communication part; (220) Maritime network communication part; (230) Multi-band control part; (240) Communication control part
Abstract translation: 公开了一种用于海上无线通信的方法和装置。 用于海上无线通信的设备包括用于与地面网络通信的地面网络通信部分; 用于与海事网络通信的海事网络通信部分; 以及通信控制部分，用于基于从陆地或海运网络通信部分提供的数据的目的地地址来链接地面和海上网络通信部分之间的通信。 因此，陆地宽带无线数据通信服务可供海上使用。 （附图标记）（210）地面网络通信部; （220）海上通信部分; （230）多频段控制部分; （240）通讯控制部分
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公开(公告)号：KR1020130120727A
公开(公告)日：2013-11-05
申请号：KR1020120043841
申请日：2012-04-26
Applicant: 한국전자통신연구원
CPC classification number: H04L25/061 , H04B1/0053 , H04B2001/305
Abstract: The present invention relates to a method for generating a multi-band RF signal by correcting direct current offset and removing an image signal by a RF transmitter in a marine wireless communication environment, and an apparatus for the same, the apparatus comprising; a baseband conversion unit for converting, into a baseband signal, each of RF signals to a baseband modulation signal having a negative frequency and a baseband modulation signal having a positive frequency; a phase correction unit for removing an image from a multi-band signal in response to the baseband signal; a direct current offset correction unit for correcting direct current offset for the baseband modulation signal using the multi-band signal from which the image is removed; and a RF transmission unit for generating RF signals using a signal in which the direct current offset is corrected, and transmitting the RF signal through an antenna. [Reference numerals] (200b) Rate matching unit;(800) Phase correction unit;(900) Direct current offset correction unit
Abstract translation: 本发明涉及通过在海洋无线通信环境中通过RF发射机校正直流偏移和去除图像信号来产生多频带RF信号的方法及其装置，该装置包括： 基带转换单元，用于将每个RF信号转换成具有负频率的基带调制信号和具有正频率的基带调制信号; 相位校正单元，用于响应于基带信号从多频带信号中去除图像; 直流偏移校正单元，用于使用去除图像的多频带信号来校正基带调制信号的直流偏移; 以及RF发送单元，用于使用校正了直流偏移的信号来产生RF信号，并且通过天线发送RF信号。 （200b）速率匹配单元;（800）相位校正单元;（900）直流偏移校正单元
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公开(公告)号：KR100874008B1
公开(公告)日：2008-12-17
申请号：KR1020070037852
申请日：2007-04-18
Applicant: 한국전자통신연구원
Abstract: A channel estimation method of an OFDM system and a channel estimator are provided to correct an instantaneous spread pilot signal power by using a Kalman filter before interpolating a frequency response without a spread pilot. A data rearranging unit(100) rearranges input OFDM(Orthogonal Frequency Division Multiplexing) data according to a channel estimation sequence. A channel estimator(200) acquires a frequency-side channel response by using a spread pilot of the OFDM data and compensates for the channel response by using a Kalman filter. The channel estimator includes a pilot group extractor(201), a Kalman filter gain calculator(207), a Kalman filter compensator(208), a pilot gain calculator(209), and an amplifier(210). The Kalman filter compensator compensates for a current channel estimation value by using a Kalman filter gain and estimates a covariance and a channel estimation value for a next channel.
Abstract translation: 提供OFDM系统的信道估计方法和信道估计器，以在插值没有扩展导频的频率响应之前通过使用卡尔曼滤波器来校正瞬时扩展导频信号功率。 数据重排单元（100）根据信道估计序列重排输入OFDM（正交频分复用）数据。 信道估计器（200）通过使用OFDM数据的扩展导频来获取频率侧信道响应，并且通过使用卡尔曼滤波器来补偿信道响应。 信道估计器包括导频组提取器（201），卡尔曼滤波器增益计算器（207），卡尔曼滤波器补偿器（208），导频增益计算器（209）和放大器（210）。 卡尔曼滤波补偿器通过使用卡尔曼滤波器增益来补偿当前信道估计值，并估计下一个信道的协方差和信道估计值。
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Patent Agency Ranking
公开(公告)号：KR100874007B1
公开(公告)日：2008-12-17
申请号：KR1020070037618
申请日：2007-04-17
Applicant: 한국전자통신연구원
Abstract: A method and an apparatus for estimating noise variance are provided to obtain a stable estimation for the noise variance even when a channel changes more rapidly than an interval of a pilot symbol by estimating the noise variance without using a result of a channel estimation or higher order statistics for a channel. A method for estimating noise variance in a multi carrier communication system comprises the following steps of: receiving a first symbol vector of a frequency domain; creating a second symbol vector by setting a symbol except for a receipt pilot symbol in the first symbol vector as 0(210); converting the second symbol vector of the frequency domain to a sample vector of a time domain(220); and estimating noise variance using the sample vector of the time domain. The step of estimating the noise variance comprises the following steps of: extracting a noise sample of a period in which a signal component does not exist, from the sample vector of the time domain(230); and calculating the variance of the extracted noise sample(240).
Abstract translation: 提供一种用于估计噪声方差的方法和装置，即使在信道变化比导频符号的间隔更快时，通过估计噪声方差而不使用信道估计的结果或更高阶来获得噪声方差的稳定估计 统计信息。 一种用于估计多载波通信系统中的噪声方差的方法，包括以下步骤：接收频域的第一符号向量; 通过将除所述第一符号向量中的接收导频符号之外的符号设置为0来创建第二符号向量（210）; 将频域的第二符号矢量转换为时域的采样矢量（220）; 以及使用时域的样本矢量来估计噪声方差。 估计噪声方差的步骤包括以下步骤：从时域的采样矢量提取其中不存在信号分量的周期的噪声采样（230）; 并计算提取的噪声样本的方差（240）。
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公开(公告)号：KR100703828B1
公开(公告)日：2007-04-04
申请号：KR1020060050718
申请日：2006-06-07
Applicant: 한국전자통신연구원
Abstract: 본 발명은 무선 디지털 통신 시스템의 자동 이득 조정 장치에 관한 것이다.
본 발명은 신호 지속 시간이 작은 신호(프리앰블)에 대해서도 자동 이득 조정 장치가 제대로 동작하도록 자동 이득 조정 장치의 구조를 제공하는 데 특징이 있다.
본 발명에 의하면, 신호 지속 시간이 작은 신호(프리앰블)를 수신하는 경우 아날로그 디지털 변환기의 입력 레벨에 적합하게 조정해줌으로써 자동 이득 조정 장치가 제대로 동작하도록 하는 효과를 기대할 수 있다.
자동 이득 조정 장치, AGC, 프리앰블, PAPRAbstract translation: 无线数字通信系统的自动增益调整装置本发明涉
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公开(公告)号：KR100526417B1
公开(公告)日：2005-11-08
申请号：KR1020030095049
申请日：2003-12-22
Applicant: 한국전자통신연구원
IPC: H04J11/00
Abstract: 본 발명은 직교 주파수 분할 다중화(Orthogonal Frequency Division Multiplexing; OFDM) 방식을 사용하는 시스템의 ADC (Analog-to-Digital Converter) 입력 단의 전력 레벨을 자동으로 조정하여 주는 자동 이득 조정 장치(Auto Gain Controller; AGC) 및 방법에 관한 것이다. 주된 발명의 특징은 종래의 반복적인 프리앰블(Preamble)을 이용하여 전력 레벨을 계산한 다음 이에 대한 이득(Gain)을 데이터(Data) 구간에 적용하는 자동 이득 조정 장치의 구조를 개선하여 반복적으로 일정한 시간의 프리앰블 구간과 데이터 구간을 갖는 패킷을 전송하는 OFDM 방식의 시스템에서 프리앰블 구간에는 종래와 같이 전력 레벨을 측정하여 이득을 조정하고 측정된 전력 레벨 값을 저장해두었다가 전력 레벨을 측정하지 않는 데이터 구간에는 미리 저장된 전력 레벨 값을 가지고 전력 레벨의 변화를 추정하여 보다 정확한 이득을 계산할 수 있으므로 ADC 출력값에 양자화 에러를 줄일 수 있고 자동 이득 조정 장치를 왜곡없이 안정화시킬 수 있다.
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公开(公告)号：KR100462022B1
公开(公告)日：2004-12-17
申请号：KR1020020064412
申请日：2002-10-22
Applicant: 한국전자통신연구원
IPC: H04B7/005
Abstract: PURPOSE: An apparatus and a method for canceling interference in a mobile communication system are provided to group receiving signals to be suitable for a request BER(Bit Error Rate) of the mobile communication system and perform group-classified interference cancellation. CONSTITUTION: The first interference canceling unit(10) has a plurality of the first detectors(100) connected in parallel, a signal selector(200) and a subtractor(300). A plurality of the first detectors(100) receive a baseband signal. The signal selector(200) compares SIR(Signal to Interference Ratio) measurement values measured in a plurality of the first detectors(100) with a certain target SIR, and selects a reproduction signal reproduced in the first detector in which the SIR measurement value is greater than the target SIR. The subtractor(300) subtracts the reproduction signal selected in the signal selector(200) from the baseband signal. A last judging unit(20) receives the signal outputted from the first interference canceling unit(10), and performs hard bit decision.
Abstract translation: 目的：提供一种用于消除移动通信系统中的干扰的设备和方法，以将接收信号分组为适合于移动通信系统的请求BER（误比特率）并执行组分类干扰消除。 构成：第一干涉消除单元（10）具有并联连接的多个第一检测器（100），信号选择器（200）和减法器（300）。 多个第一检测器（100）接收基带信号。 信号选择器（200）将在多个第一检测器（100）中测量的SIR（信号干扰比）测量值与特定目标SIR进行比较，并且选择在第一检测器中再现的再现信号，其中SIR测量值是 大于目标SIR。 减法器（300）从基带信号中减去在信号选择器（200）中选择的再现信号。 最后判断单元（20）接收从第一干扰消除单元（10）输出的信号，并执行硬比特判定。
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公开(公告)号：KR1020170116708A
公开(公告)日：2017-10-20
申请号：KR1020160044619
申请日：2016-04-12
Applicant: 한국전자통신연구원
CPC classification number: B61L23/34 , B61L15/0027 , B61L25/02 , B61L25/021 , B61L27/0005 , B61L2201/00 , H04W4/027 , H04W4/90
Abstract: 본발명은열차추돌방지시스템에관한것으로서, 본발명의실시예에따른열차추돌방지시스템은열차의소정위치에장착되어상기열차의안전메시지를송출하는차상이동국장치, 상기열차가운행하는열차선로를따라일정거리마다고정된위치에설치되며, 상기열차의안전메시지를수신하여기설정된반경이내에위치한주변열차에전송되도록제어하는복수의기지국을포함하되, 상기차상이동국장치는상기복수의기지국중 적어도하나의기지국으로부터상기주변열차의안전메시지를수신하는경우, 상기열차와상기주변열차간의충돌발생가능성여부를판단하고, 판단결과에따라경고동작을수행한다.
Abstract translation: 本发明是一种，车载移动站装置，根据本发明的一个实施方式的列车线路到火车站的列车碰撞防止系统被安装在列车上的预定位置发送的热量的安全消息，本发明涉及预防列车碰撞系统 并且多个基站以预定距离安装在固定位置并控制列车的安全消息向位于预定半径内的外围列车的传输， 并且确定列车和外围列车之间是否存在碰撞的可能性，并且根据确定结果执行警告操作。
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