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171.发明公开
公开(公告)号：KR1020090074136A
公开(公告)日：2009-07-06
申请号：KR1020090052902
申请日：2009-06-15
Applicant: 한국전자통신연구원 , 중앙대학교 산학협력단
CPC classification number: H04L25/0232 , H04L5/0023 , H04L5/0032 , H04L5/0048 , H04L25/0226 , H04L27/2657 , H04L27/2662 , H04B7/15528 , H04W56/001
Abstract: An apparatus and a method for channel estimation and synchronization in an OFDM/OFDMA relay system are provided to improve the deterioration of the channel estimation performance due to delay by estimating a channel between a transmitter and a terminal when receiving data through a relay. A synchronizing device includes an offset storage(1210), a transmission device identifier(1220), a compensator(1230), an estimator and an updating unit. The offset storage stores the carrier frequency offset between each transmission device and the terminal and the timing offset. The transmission device identifier identifies the transmission device transmitting the signal when receiving the signal. The compensator compensates for the carrier frequency offset and the timing offset about the received signal. The estimator estimates the carrier frequency offset and the timing offset between the transmission device and the terminal. The updating unit updates the carrier frequency offset and the timing offset of the identified transmission device stored in an offset storage by the estimated carrier frequency offset and timing offset.
Abstract translation: 提供OFDM / OFDMA中继系统中用于信道估计和同步的装置和方法，用于通过在通过中继接收数据时通过估计发射机和终端之间的信道来改善由于延迟引起的信道估计性能的恶化。 同步装置包括偏移存储器（1210），传输设备标识符（1220），补偿器（1230），估计器和更新单元。 偏移存储器存储每个传输设备和终端之间的载波频率偏移和定时偏移。 传输设备标识符识别当接收到信号时发送信号的传输设备。 补偿器补偿载波频率偏移和关于接收信号的定时偏移。 估计器估计传输设备和终端之间的载波频率偏移和定时偏移。 更新单元通过估计的载波频率偏移和定时偏移来更新存储在偏移存储器中的所识别的发送设备的载波频率偏移和定时偏移。
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公开(公告)号：KR1020090066200A
公开(公告)日：2009-06-23
申请号：KR1020080085223
申请日：2008-08-29
Applicant: 한국전자통신연구원 , 아주대학교산학협력단
IPC: H04W36/18
Abstract: A user terminal and a method thereof for providing a service through handover are provided to maintain the quality of end-to-end service and to reduce the help of network in uplink layer. A service quality manager(220) determines the service quality customer satisfaction measurement of a service flow. A sequence manager(230) combines a service flow providing the same service transmitted through multi-path for handover. A handover manager(240) selects handover access network performing handover. When the handover manager provides the service through multi-path, the service flow satisfying a handover completion condition is connected.
Abstract translation: 提供用于通过切换提供服务的用户终端及其方法，以维持端到端服务的质量并减少上行链路层中网络的帮助。 服务质量管理器（220）确定服务流程的服务质量客户满意度测量。 序列管理器（230）组合提供通过多路径发送的用于切换的相同服务的服务流。 切换管理器（240）选择执行切换的切换接入网络。 当切换管理器通过多路径提供服务时，连接满足切换完成条件的服务流。
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公开(公告)号：KR1020090066199A
公开(公告)日：2009-06-23
申请号：KR1020080085222
申请日：2008-08-29
Applicant: 한국전자통신연구원 , 아주대학교산학협력단
Abstract: An element and an interworking scheme decision method of a communications system and an apparatus thereof considering the communications environment are provided to interwork between the arrangement of communications system components and the elements in consideration of the communications environment. A communications environment analysis unit(3201) determines wireless communications network in consideration of the inputted wireless communications network information. An organization element choice unit(3203) determines the communications system component according to the wireless communications network. A component arrangement positioning unit(3205) determines the arrangement position of element according to the set up information. An interworking scheme setting unit sets up the interworking scheme of the communications components in which the arrangement position is determined.
Abstract translation: 提供了考虑通信环境的通信系统及其装置的元素和互配方案决策方法，以考虑到通信环境的通信系统组件的布置和元素之间的相互配合。 通信环境分析单元（3201）考虑所输入的无线通信网络信息来确定无线通信网络。 组织单元选择单元（3203）根据无线通信网络确定通信系统组件。 元件配置定位单元（3205）根据设置信息确定元件的布置位置。 互通方案设置单元设置确定了布置位置的通信部件的互通方案。
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公开(公告)号：KR1020090059893A
公开(公告)日：2009-06-11
申请号：KR1020070126979
申请日：2007-12-07
Applicant: 한국전자통신연구원
CPC classification number: H03M13/2957 , H03M13/6325
Abstract: An iterative receiving device and an iterative decoding device are provided to improve an iterative reception, an iterative decoding performance, and a collecting speed by using an optimum detector like a MAP(Maximum A Posteriori) detector as an inner detector. An inner detector(201) detects a receiving signal. An outer decoder(203) decodes the receiving signal detected by the inner detector. An impurity addition device(205) adds impurity to an output signal of the outer decoder. An interleaver(204) performs interleaving between the inner detector and the outer decoder. A de-interleaver(202) performs de-interleaving between the inner detector and the outer decoder. The inner detector is an SC-MMSE(Soft interference Cancellation with Minimum Mean Squared Error) or a MAP detector.
Abstract translation: 提供迭代接收装置和迭代解码装置，以通过使用像MAP（Maximum A Posteriori）检测器这样的最佳检测器作为内部检测器来改善迭代接收，迭代解码性能和收集速度。 内部检测器（201）检测接收信号。 外部解码器（203）对由内部检测器检测到的接收信号进行解码。 杂质添加装置（205）将杂质添加到外部解码器的输出信号。 交织器（204）在内部检测器和外部解码器之间执行交织。 解交织器（202）在内部检测器和外部解码器之间执行解交织。 内部检测器是SC-MMSE（具有最小均方误差的软干扰消除）或MAP检测器。
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公开(公告)号：KR1020090047633A
公开(公告)日：2009-05-13
申请号：KR1020070113568
申请日：2007-11-08
Applicant: 한국전자통신연구원 , 동국대학교 산학협력단
CPC classification number: H04L1/206
Abstract: 순환 지연 다이버시티(CDD, cyclic delay diversity)에 관한 것으로서, 특히 최적의 순환 지연 값을 갖는 순환 지연 다이버시티 방법 및 장치를 개시한다.
다이버시티 차수에 따른 신호대잡음간섭 함수를 결정하는 단계와, 채널 추정 오류 분산 함수를 결정하는 단계 및 상기 신호대잡음간섭 함수 및 채널 추정 오류 분산 함수에 따라서 시스템에 요구되는 SINR을 결정하는 단계를 포함하는 최적의 순환 지연 값을 결정하는 방법을 제공한다.
CDD(cyclic delay diversity), SINR, 순환 지연,-
Patent Agency Ranking176.发明授权
公开(公告)号：KR100884556B1
公开(公告)日：2009-02-19
申请号：KR1020070102609
申请日：2007-10-11
Applicant: 한국전자통신연구원
CPC classification number: H04L27/2607 , H04L27/2636 , H04L27/2644
Abstract: 본 발명은 직교주파수 분할 다중 접속(OFDMA) 시스템에서 순환전치(CP) 구간을 넘어가는 지연확산을 갖는 특정 단말에 대해 다른 단말에는 영향을 미치지 않으면서 특정 단말의 보호구간만을 확장함으로써, 특정 단말의 성능을 보장할 뿐만 아니라 다른 단말의 성능에도 영향을 미치지 않도록 하는 송신장치 및 그 방법에 관한 것으로, 직교주파수분할다중접속(OFDMA) 시스템에서 보호구간보다 큰 지연확산을 가지거나 큰 타이밍 오차를 가질 것으로 추정된 단말로 전송되는 데이터의 보호구간을 확장하기 위한 장치에 있어서, 현재 심벌의 일부를 이전 심벌의 마지막 부분에 복사하여 보호구간이 확장된 심벌들을 생성하는 보호구간 확장 처리수단; 상기 보호구간 확장 처리수단에 의해 처리된 심벌들을 입력받아 업 샘플링을 수행하는 업 샘플링 처리수단; 상기 업 샘플링 처리수단의 출력에 대해 주파수 영역의 데이터를 적당한 부반송파에 실을 수 있도록 보간 필터값과 순환 콘볼루션을 수행하여 보간 처리를 수행하는 보간 처리수단; 및 상기 보간 처리수단의 출력에 대해 순환전치 부호를 삽입하는 순환전치 삽입수단을 포함한다.
OFDMA, 보호, 구간, 순환, 전치, CP, 확장, 송신, IFFT, FFT, 보간-
公开(公告)号：KR100883354B1
公开(公告)日：2009-02-17
申请号：KR1020070109512
申请日：2007-10-30
Applicant: 한국전자통신연구원
CPC classification number: H04B7/0632 , H04B7/0647 , H04L1/0026 , H04L1/0027
Abstract: 본 발명은 직교주파수분할다중접속(OFDMA) 통신 시스템과 같은 다중 반송파 무선 시스템에서 채널 품질 정보(CQI)를 피드백하기 위해 채널 품질 정보의 보고 주기를 결정하는 방법 및 장치에 관한 것으로, 직교주파수 분할다중 접속(OFDMA)을 기반으로 하는 단말에서의 채널 품질 정보의 피드백을 위한 보고 주기 결정 방법에 있어서, (a) 기지국으로부터 수신된 채널을 통해 채널 이득을 계산하는 단계; (b) 공평성 정도를 결정짓는 변수와 상기 계산된 채널 이득을 이용해 가중치를 계산한 다음 상기 계산된 가중치를 이용해 상기 계산된 채널 이득에 대한 가중 채널 품질을 계산하는 단계; (c) 상기 계산된 가중 채널 품질과 임계치를 비교하는 단계; 및 (d) 상기 가중 채널 품질이 상기 임계치 이상인 경우에만 채널 품질 정보의 피드백을 위해 할당된 무선 자원을 이용해 측정된 채널 품질 정보를 피드백하는 단계를 포함한다.
OFDMA, 직교, 주파수, 분할, 다중, CQI, 채널 품질, 피드백, 주기, 전송, 가중 채널 품질-
178.发明公开
公开(公告)号：KR1020080052300A
公开(公告)日：2008-06-11
申请号：KR1020070086540
申请日：2007-08-28
Applicant: 한국전자통신연구원 , 중앙대학교 산학협력단
CPC classification number: H04L25/0232 , H04L5/0023 , H04L5/0032 , H04L5/0048 , H04L25/0226 , H04L27/2657 , H04L27/2662 , H04L25/0224 , H04B7/155 , H04L27/2675 , H04L27/2695
Abstract: An apparatus and a method for channel estimation and synchronization in an OFDM/OFDMA(Orthogonal Frequency Division Multiplexing Access) relay system are provided to estimate a channel by estimating a propagation delay weight using a conventional pilot signal without a training signal. An apparatus for channel estimation and synchronization in an OFDM/OFDMA relay system includes a pilot extraction unit(410), a propagation delay estimation unit(430), and a weight value estimation unit(440). The pilot extraction unit extracts pilot signals based on a frequency domain signal which is Fourier-transformed after a signal received from a transparent relay is synchronized with a reference signal received from a base station. The propagation delay estimation unit estimates a propagation delayer between the transparent relay and a terminal based on the extracted pilot signal and the reference pilot signal as a predetermined signal value corresponding to the extracted pilot signal. The weight value estimation unit estimates a propagation delay weight value for estimating a channel between the terminal and the transparent relay based on the estimated propagation delay.
Abstract translation: 提供OFDM / OFDMA（正交频分复用接入）中继系统中的信道估计和同步的装置和方法，以便通过使用没有训练信号的常规导频信号来估计传播延迟权重来估计信道。 OFDM / OFDMA中继系统中的信道估计和同步装置包括导频提取单元（410），传播延迟估计单元（430）和权重值估计单元（440）。 导频提取单元基于在从透明中继器接收的信号与从基站接收的参考信号同步之后进行傅里叶变换的频域信号。 传播延迟估计单元基于所提取的导频信号和参考导频信号来估计透明中继和终端之间的传播延迟器，作为与提取的导频信号相对应的预定信号值。 权重值估计单元基于估计的传播延迟来估计用于估计终端和透明中继之间的信道的传播延迟权重值。
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公开(公告)号：KR1020080050221A
公开(公告)日：2008-06-05
申请号：KR1020070057886
申请日：2007-06-13
Applicant: 한국전자통신연구원
CPC classification number: H04J1/02 , H04L1/0041 , H04L1/04 , H04L27/2602 , H04L27/2614 , H04L27/2636 , H04L27/2647 , H04W52/16 , H04W52/267 , H04W52/346 , H04L27/2697
Abstract: An apparatus and a method for transmitting/receiving multi-code word in an SC-FDMA(Single Carrier-Frequency Division Multiple Access) are provided to reduce an interference between symbols in a frequency selective fading environment. A demultiplexer divides a data stream of a user into the M number of sub-streams(S210). The M number of encoders and the M number of QAM(Quadrature Amplitude Modulation) mappers independently perform channel coding and QAM mapping on each of the M number of sub-streams(S220). The M number of QAM-mapped sub-streams are mapped to DFT(Discrete Fourier Transform) indexes by using a DFT mapper(S230). The DEF mapper applies DFT to the mapped signals(S240). The DFT-applied signals are mapped to sub-carriers corresponding to the user by using a sub-carrier mapper(S250). IFFT(Inverse Fast Fourier Transform) is applied to the sub-carrier mapped result signals, which are then transmitted via a transmission antenna(S260).
Abstract translation: 提供了一种用于在SC-FDMA（单载波 - 频分多址）中发送/接收多码字的装置和方法，以减少频率选择性衰落环境中的符号之间的干扰。 解复用器将用户的数据流划分为M个子流（S210）。 M个编码器和M个QAM（正交幅度调制）映射器在M个子流中的每一个上独立地执行信道编码和QAM映射（S220）。 通过使用DFT映射器将M个QAM映射子流映射到DFT（离散傅里叶变换）索引（S230）。 DEF映射器将DFT应用于映射信号（S240）。 通过使用副载波映射器将DFT应用信号映射到对应于用户的子载波（S250）。 IFFT（逆快速傅立叶变换）被应用于副载波映射结果信号，然后经由发送天线发送（S260）。
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公开(公告)号：KR1020080040575A
公开(公告)日：2008-05-08
申请号：KR1020070109512
申请日：2007-10-30
Applicant: 한국전자통신연구원
CPC classification number: H04B7/0632 , H04B7/0647 , H04L1/0026 , H04L1/0027
Abstract: A method and an apparatus for determining a report period of channel quality information in a multi-carrier wireless system are provided to improve the report success probability of a user in a good channel state by differently giving a report period of CQI(Channel Quality Information) according to a channel state measured by every user terminal. A user terminal receives a factor for determining an equality degree used for each user terminal and various variables such as a threshold value given to each terminal according to priority levels from a base station and stores them in a memory(201). The user terminal calculates a channel gain by using a pilot signal received from the base station(202). The user terminal calculates a statistical expected value with respect to the calculated channel gain, calculates a weight value by using the factor determining the degree of equality, and calculates a weighted channel quality by multiplying the calculated weight value and the channel gain(203). A CQI transmission determining unit of the user terminal compares the calculated weighted channel quality with the received threshold value(204). If the calculated weighted channel quality is larger than the threshold value, the user terminal feeds back the measured channel quality information to the base station(205).
Abstract translation: 提供一种用于确定多载波无线系统中的信道质量信息的报告周期的方法和装置，通过不同地给出CQI（信道质量信息）的报告周期来提高用户处于良好信道状态的报告成功概率， 根据每个用户终端测量的信道状态。 用户终端根据来自基站的优先级，接收用于确定用于每个用户终端的相等程度的因子和各种变量，例如给予每个终端的阈值，并将它们存储在存储器（201）中。 用户终端通过使用从基站（202）接收的导频信号来计算信道增益。 用户终端相对于计算出的信道增益计算统计期望值，通过使用确定相等程度的因子计算权重值，并通过将计算出的权重值与信道增益相乘来计算加权信道质量（203）。 用户终端的CQI发送确定单元将所计算的加权信道质量与接收到的阈值进行比较（204）。 如果所计算的加权信道质量大于阈值，则用户终端将所测量的信道质量信息反馈给基站（205）。
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