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    • 11. 发明公开
    • 무선 통신 시스템에서의 자원 할당 방법
    • 无线通信系统资源分配方法
    • KR1020120126447A
    • 2012-11-21
    • KR1020110044226
    • 2011-05-11
    • 한국전자통신연구원강원대학교산학협력단
    • 신우람예충일김지형김근영안동현임광재권동승이승준
    • H04W72/04H04J11/00H04B15/00
    • H04W72/0446H04W56/00H04W72/082H04W84/18
    • PURPOSE: A resource allocation method in a wireless communication system is provided to reduce interference between users by allocating a slot having the highest performance index among unoccupied slots in an OFDMA(Orthogonal Frequency Division Multiple Access) type ad-hoc system to a terminal. CONSTITUTION: A resource allocating device senses a subcarrier already being used by the other terminal among all of subcarriers(S410). The resource allocating device obtains a time error, a frequency error, and receiving power information of the occupied subcarrier(S420). The resource allocating device calculates an SINR(Signal-to-Interference plus Noise Ratio) of unoccupied subcarriers(S430). The resource allocating device allocates a subcarrier having the highest SINR among the unoccupied subcarriers to a terminal(S440). [Reference numerals] (S410) Sensing a subcarrier being used; (S420) Acquiring a time error, a frequency error, and receiving power information of the occupied subcarrier; (S430) Calculating SINR of unoccupied subcarriers; (S440) Selecting and allocating a subcarrier with the maximum SINR
    • 目的:提供一种无线通信系统中的资源分配方法,用于通过在OFDMA(正交频分多址)类型自组织系统中的未占用时隙之间分配具有最高性能指标的时隙来减少用户之间的干扰。 构成:资源分配装置检测所有子载波中已经被其他终端使用的副载波(S410)。 资源分配装置获取所占用的副载波的时间误差,频率误差和接收功率信息(S420)。 资源分配装置计算未占用子载波的SINR(信号与干扰加噪声比)(S430)。 资源分配装置将未占用副载波中具有最高SINR的子载波分配给终端(S440)。 (附图标记)(S410)感测正在使用的副载波; (S420)获取所占用的副载波的时间误差,频率误差和接收功率信息; (S430)计算未占用子载波的SINR; (S440)选择并分配具有最大SINR的子载波
    • 14. 发明公开
    • 단말간 임의 접속방법 및 이를 위한 단말장치
    • 移动终端中移动终端与移动终端之间的接入方法
    • KR1020050066275A
    • 2005-06-30
    • KR1020030097539
    • 2003-12-26
    • 한국전자통신연구원
    • 안동현황유선김응배
    • H04J3/06
    • H04W74/0833H04B7/2643H04W56/0015H04W74/0875
    • 본 발명은, TDMA 채널에 복수개의 단말들이 다중 접속하는 경우, 다수의 단말에게 접속의 기회를 보다 공정하게 부여하면서 여러 가지 단말간의 문제들을 완화할 수 있는 무선 단말기간 다중접속 방법 및 그 단말기를 제공한다.
      본 발명에 따르면, 기준시간에 따른 동기신호를 수신하여 하나 이상의 동기점들을 생성하고, 동기점을 기준으로 하여 소정의 채널감지구간(SCSP) 동안 채널신호를 감지한다. 여기서 채널신호가 감지되지 않는 경우, 채널감지구간이 종료된 후, 송신요청 신호구간 동안 데이터전송을 원하는 단말과의 사이에 송신요청신호를 송수신하고, 송신요청 신호구간이 종료된 후 송신승인 신호구간 동안 송신승인신호를 송수신한다. 이렇게 하여 송신요청신호 및 송신승인신호에 기초하여 데이터가 송수신될 데이터채널이 형성되고 이 데이터채널을 통하여 데이터가 송수신된다.
      데이터채널의 사용권의 확보를 위하여 단말기간 동기하여 송신요청승인 과정을 수행함으로써, 시스템이 안정적으로 동작할 수 있으며 단말기 간 공정성이 보장된다. 또한, 숨겨진 단말의 문제, 노출 단말의 문제, 대기 단말의 문제가 대폭 개선될 수 있다.
    • 15. 发明公开
    • 무선 패킷통신용 동기식 광대역 코드분할 다중접속 수신기의 구조
    • 同步宽带CDMA无线分组通信的结构
    • KR1020010010279A
    • 2001-02-05
    • KR1019990029078
    • 1999-07-19
    • 한국전자통신연구원
    • 오현서안동현김민택한기철
    • H04B1/7077
    • H04B1/7077H04B1/70735H04B7/2628H04J13/0022
    • PURPOSE: A structure of a synchronous wide band CDMA for wireless packet communication is provided to be applicable to packet communication as well as circuit communication with improving demodulation efficiency of a receiver. CONSTITUTION: An IF band pass filter(102) filters only wide band including information in the output signals of a mixer(101). A QPSK demodulator(103) receives the signal outputted from the IF band pass filter(102) for generating carrier wave signal having same phase and orthogonal phase on the basis of the first IF clock signal generated in a PLL block(105), and separates I channel and Q channel by using the carrier wave signal. An A/D converter(104) converts an analog base band signal into a digital sample. The PLL block(105) generates a master clock which becomes a clock source for operation of a modem. A TCXO(Temperature Controlled Crystal Oscillator)(106) supplies a reference clock to the PLL block(105) and varies the reference clock according to the output value of a low pass filter(107). A match filter block(108) receives a digital sample and calculates an energy by chip units, and compares the calculated energy with an inner set energy. A synchronous code tracking block(109) receives a digital sample, detects a timing error by chip unit, and controls timing by sub-chip units for meeting code synchronization and generating a PN chip clock. A channel phase and frequency error tracking block(110) separates only a pilot signal from the received signal and calculates amplitude and composition of the channel. A synchronous demodulating block(11) demodulates the QPSK modulated signal by traffic channels for restoring a symbol.
    • 目的:提供用于无线分组通信的同步宽带CDMA的结构,以适应于具有提高接收机的解调效率的分组通信以及电路通信。 构成:IF带通滤波器(102)仅滤波宽带,包括混频器(101)的输出信号中的信息。 QPSK解调器(103)根据在PLL块(105)中产生的第一IF时钟信号接收从IF带通滤波器(102)输出的信号,用于产生具有相同相位和正交相位的载波信号,并分离 I通道和Q通道使用载波信号。 A / D转换器(104)将模拟基带信号转换成数字样本。 PLL块(105)产生主时钟,其成为用于调制解调器操作的时钟源。 TCXO(温度控制晶体振荡器)(106)将参考时钟提供给PLL块(105),并根据低通滤波器(107)的输出值改变参考时钟。 匹配滤波器块(108)接收数字采样并且计算每个芯片单位的能量,并将计算的能量与内部设定能量进行比较。 同步码跟踪块(109)接收数字采样,通过芯片单元检测定时误差,并通过子芯片单元控制定时以满足代码同步并产生PN码片时钟。 频道相位和频率误差跟踪块(110)仅分离来自接收信号的导频信号,并计算频道的幅度和组成。 同步解调块(11)通过用于恢复符号的业务信道对QPSK调制信号进行解调。
    • 19. 发明公开
    • 무선 애드혹 네트워크에서의 전력 제어 방법
    • 无线AD-HOC网络中控制功率的方法
    • KR1020120086547A
    • 2012-08-03
    • KR1020110007856
    • 2011-01-26
    • 한국전자통신연구원
    • 예충일안동현
    • H04W52/08H04W52/50H04W72/04H04W84/18H04L5/00
    • H04W52/08H04L5/0007H04L5/0037H04W52/50H04W72/0446H04W84/18Y02D70/00
    • PURPOSE: A power control method in a wireless ad-hoc network is provided to eliminate inference on power control for sensing the channel occupation of adjacent nodes in a wireless network. CONSTITUTION: A node determines the initial transmission power of data subcarriers in a PDU(Protocol Data Unit) slot and an ACK(Acknowledgement) slot(S610). The node transmits the data subcarriers using the initial transmission power. The node transmits pilot subcarriers of the PDU slot and the ACK slot using the fixed power(S620). The node determines the transmission power of the data subcarriers in the PDU slot and the ACK slot by controlling closed loop power(S630). The node transmits the data subcarriers using transmission power determined in the frame. The node transmits the pilot subcarriers using the fixed power(S640).
    • 目的:提供无线自组织网络中的功率控制方法,以消除对无线网络中相邻节点的信道占用的功率控制的推断。 构成:节点确定PDU(协议数据单元)时隙和ACK(确认)时隙中的数据子载波的初始发送功率(S610)。 节点使用初始发送功率发送数据子载波。 节点使用固定功率发送PDU时隙的导频子载波和ACK时隙(S620)。 该节点通过控制闭环功率来确定PDU时隙中的数据子载波的发送功率和ACK时隙(S630)。 节点使用在帧中确定的发射功率来发射数据子载波。 节点使用固定功率发送导频子载波(S640)。
    • 20. 发明公开
    • 버스 중재 방법 및 단말
    • 总线仲裁方法和终端
    • KR1020100064282A
    • 2010-06-14
    • KR1020090027094
    • 2009-03-30
    • 한국전자통신연구원삼성전자주식회사
    • 조승권김영일이윤주안동현송석일이석진김기석박철
    • H04W28/20H04W72/12H04W80/00
    • H04W72/0453H04W72/12H04W80/02H04W88/02
    • PURPOSE: A bus mediation method and a terminal are provided to effectively reduce the number of signal lines for interface between MAC layer and physical layer in a terminal, thereby making a design of a terminal system conveniently. CONSTITUTION: The first and the second MAC(Medium Access Control) units(222,223) respectively processes a signal of the first and the second frequency sub band. A DL(DownLink) bus and UL(UpLink) bus connects the first MAC units and the first physical layer unit(231), or the second MAC unit and the second physical layer unit(232). A DL bus mediator(224) permits the use of the DL bus to one of the first and the second MAC units. The UL bus mediator(225) permits the use of the UL bus to one of the first and the second MAC units.
    • 目的:提供总线中介方法和终端,以有效减少终端中MAC层与物理层之间接口的信号线数量,从而方便设计终端系统。 构成:第一和第二MAC(媒体访问控制)单元(222,223)分别处理第一和第二频率子带的信号。 DL(DownLink)总线和UL(UpLink)总线连接第一MAC单元和第一物理层单元(231)或第二MAC单元和第二物理层单元(232)。 DL总线中介器(224)允许将DL总线用于第一和第二MAC单元之一。 UL总线中介器(225)允许将UL总线用于第一和第二MAC单元之一。