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公开(公告)号：KR1020090110717A
公开(公告)日：2009-10-22
申请号：KR1020080036354
申请日：2008-04-18
Applicant: 한국전자통신연구원 , 중앙대학교 산학협력단
CPC classification number: H04W68/02 , H04W52/02 , H04W56/002
Abstract: PURPOSE: A method and an apparatus for detecting a paging indicator in an orthogonal frequency division based mobile communication system are provided to transmit a paging indicator using a preamble, thereby transmitting a paging indicator without increasing overhead. CONSTITUTION: A method for detecting a paging indicator in an orthogonal frequency division based mobile communication system comprises the following steps. A mobile terminal(110,120) is waked up during a paging available interval assigned to the mobile terminal from an idle mode, synchronization for detecting a paging indicator is obtained. When serving base stations of a current paging available interval and a previous paging available interval are different according to a synchronization obtaining result, paging control information is obtained.
Abstract translation: 目的：提供一种用于在基于正交频分的移动通信系统中检测寻呼指示符的方法和装置，以使用前置码发送寻呼指示符，从而发送寻呼指示符而不增加开销。 构成：在基于正交频分的移动通信系统中检测寻呼指示符的方法包括以下步骤。 在从空闲模式分配给移动终端的寻呼可用间隔期间，移动终端（110,120）被唤醒，获得用于检测寻呼指示符的同步。 当服务于当前寻呼可用间隔的基站和先前的寻呼可用间隔根据同步获取结果不同时，获得寻呼控制信息。
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公开(公告)号：KR1020090085504A
公开(公告)日：2009-08-07
申请号：KR1020080089608
申请日：2008-09-11
Applicant: 한국전자통신연구원
CPC classification number: H04W12/02 , H04B7/06 , H04L5/0016 , H04L5/0023 , H04L5/0026 , H04L5/0062 , H04L5/0073 , H04W52/367 , H04W72/087 , H04B7/0413 , H04L27/2691
Abstract: An interference mitigation method of a cellular system based on orthogonal frequency division multiple access is provided to improve spectrum efficiency of a cell boundary user by removing interference between cells using a multiple receiving antenna and a spreading code. A radio resource is divided into a resource group for reusing a partial frequency and a resource group for removing interference between cells(S910). The resource group for reusing a partial frequency is redivided into detailed resource groups as the number of cells for reusing a partial frequency(S920). The resource group for removing the interference between the cells in redivided into detailed resource groups according to spreading coefficient(S930). A resource of the resource group according to the spreading coefficient is allocated according to a performance requirement of a down-link control channel(S950). Each transmitting data symbol is spread to a spreading code vector coupled with each unit resource, and is transmitted by using a base resource which forms a corresponding unit resource(S960). A data symbol is restored according to the spreading coefficient by receiving desired signals or interference signals(S970).
Abstract translation: 提供了基于正交频分多址的蜂窝系统的干扰减轻方法，通过消除使用多个接收天线和扩展码的小区之间的干扰来提高小区边界用户的频谱效率。 无线电资源被划分为用于重新使用部分频率的资源组和用于消除小区之间的干扰的资源组（S910）。 用于重用部分频率的资源组被重新划分为详细的资源组，作为重新使用部分频率的单元数（S920）。 根据扩展系数将资源组中的干扰消除为详细的资源组（S930）。 根据扩频系数的资源组资源根据下行链路控制信道的性能要求分配（S950）。 每个发送数据符号被扩展到与每个单元资源耦合的扩展码向量，并且通过使用形成相应单元资源的基本资源来发送（S960）。 通过接收所需信号或干扰信号，根据扩展系数恢复数据符号（S970）。
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173.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：KR1020090064783A
公开(公告)日：2009-06-22
申请号：KR1020070132109
申请日：2007-12-17
Applicant: 한국전자통신연구원 , 재단법인서울대학교산학협력재단
CPC classification number: H04L1/18 , H04B7/026 , H04B7/15592 , H04L2001/0097
Abstract: A wireless communication system performing cooperation diversity using cyclic delay and method are provided to perform cooperation diversity using cyclic delay of mobile terminal on the wireless communication system. A wireless telecommunications system which performs the cooperation diversity using cyclic delay comprises a data transmission part, error detection result receiver, and data retransmission part. Each data is transmitted to at least one relay terminal device and receiving terminal device. The error detection result is received from the relay terminal device detecting the error of data among one or more relay terminal device.
Abstract translation: 提供使用循环延迟和方法执行协作分集的无线通信系统，以使用无线通信系统上的移动终端的循环延迟来执行协作分集。 使用循环延迟执行协作分集的无线电信系统包括数据发送部分，错误检测结果接收器和数据重传部分。 每个数据被发送到至少一个中继终端设备和接收终端设备。 从检测到一个以上的中继终端装置之间的数据的错误的中继终端装置接收到错误检测结果。
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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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Patent Agency Ranking
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,-
177.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-
179.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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