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公开(公告)号：KR100862724B1
公开(公告)日：2008-10-10
申请号：KR1020070018976
申请日：2007-02-26
Applicant: 한국전자통신연구원
CPC classification number: H04L27/2614 , H04L5/0007 , H04L25/0204 , H04L25/0224 , H04L25/0226 , H04L27/2602 , H04L27/2607 , H04L27/2613
Abstract: 본 발명은 무선 통신 시스템의 파일롯 신호 송수신 장치 및 그 방법에 관한 것이다.
본 발명에서는, 데이터 신호보다 짧은 길이로 구성될 수 있는 파일롯 신호 블록을 생성할 때, 주파수 영역 채널 추정 성능을 보장하기 위하여 특정 파일롯 신호 블록 별로 소정 간격만큼 주파수를 천이시킨다. 이후, 천이시킨 파일롯 신호의 길이에 따른 순환 프리픽스(Cycle Prefix)를 파일롯 신호에 첨가한 후, 데이터 신호를 파일롯 신호와 함께 시분할 다중화하여 안테나를 통해 송신한다. 이에 앞서, 파일롯 신호와 함께 데이터 신호를 전송하는 부 반송파의 위치를 결정한 후, 결정된 부 반송파에 데이터 신호를 매핑하는데, 이때 하나의 심볼에 대한 채널의 다양성(diversity)을 이용하여 L-FDMA(Localized FDMA) 채널 또는 D-FDMA(Distribued FDMA) 채널의 특성을 이용하는 전송 방법 중 어느 것에도 데이터 신호를 매핑시킬 수 있다. 이를 통해, 주파수 영역의 주파수 해상도를 유지할 수 있어 고품질의 채널 추정 성능을 제공할 수 있다.
단일 반송파 주파수 분할 다중 접속(SC-FDMA), 주파수 해상도, 채널 추정-
公开(公告)号：KR100842292B1
公开(公告)日：2008-06-30
申请号：KR1020060125133
申请日：2006-12-08
Applicant: 한국전자통신연구원
Abstract: 본 발명은 무선 공간 채널에서 수신된 데이터의 유효성 여부 판단 방법 및 그 장치에 관한 것으로, 광대역 무선 공간 채널에서 데이터 측정시 별도로 잡음 신호만의 대표 전력을 구한 후에 상기 데이터의 최대 전력과 비교하는 방식으로 상기 데이터의 유효성 여부를 판단하는 방법 및 그러한 장치에 관한 것이다. 이는 무선 공간 채널 측정시스템에서 수신된 데이터를 효율적으로 처리하는 방법에 관한 것으로 기존의 측정된 데이터를 일일이 눈으로 보고 판단하여 데이터의 유효성을 판단하는 방법에서 벗어나 자동으로 측정된 데이터의 유효성 여부를 잡음 신호와의 비교를 통하여 판단하는 구성으로 이루어진다. 본 발명에 의하면, 잡음신호의 전력을 간단히 계산할 수 있고, 이를 통하여 측정 데이터의 유효성을 자동적으로 판단할 수 있게 되어 광대역 무선 공간 채널 측정시스템 상에서 측정된 데이터를 빠르고 효율적으로 처리할 수 있게 된다.
광대역, 무선공간채널, 잡음신호, 측정시스템-
公开(公告)号：KR1020080052380A
公开(公告)日：2008-06-11
申请号：KR1020070118517
申请日：2007-11-20
Applicant: 한국전자통신연구원
IPC: H04L1/16
CPC classification number: H04L47/10 , H04L1/1861 , H04L1/1867 , H04L45/02
Abstract: An apparatus and a method for transmitting/receiving a reception acknowledgement signal in a mobile communication system are provided to improve a performance by analyzing a reception acknowledgement signal using non-uniformity of an ACK/NACK signal. A method for transmitting/receiving a reception acknowledgement signal in a mobile communication system includes the steps of: receiving a reception acknowledgement signal for the reception of a transmitted packet data(S210); calculating a reception completion signal probability which indicates the reception completion of the packet data, and a reception fail signal probability which represents a reception failure of the packet data based on a predicted packet error rate for the reception completion of the packet data in response to a predetermined requested packet error rate(S220); and determining whether the reception acknowledgement signal is the reception completion signal or the reception failure signal based on the calculated reception fail signal probability and the calculated reception completion signal probability(S230).
Abstract translation: 提供一种用于在移动通信系统中发送/接收接收确认信号的装置和方法，以通过使用ACK / NACK信号的不均匀性分析接收确认信号来提高性能。 一种用于在移动通信系统中发送/接收接收确认信号的方法包括以下步骤：接收用于接收所发送的分组数据的接收确认信号（S210）; 计算表示分组数据的接收完成的接收完成信号概率以及响应于分组数据的接收完成的预测分组错误率的表示分组数据的接收失败的接收失败信号概率 预定的请求分组错误率（S220）; 以及基于所计算的接收失败信号概率和所计算的接收完成信号概率来确定接收确认信号是接收完成信号还是接收失败信号（S230）。
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公开(公告)号：KR1020080052159A
公开(公告)日：2008-06-11
申请号：KR1020070035859
申请日：2007-04-12
Applicant: 한국전자통신연구원
CPC classification number: H04L25/0236 , H04L25/0328 , H04L25/067 , H04L27/2647 , H04L27/2691 , H04J11/005
Abstract: An apparatus and a method for mitigating inter-cell interference in an OFDMA(Orthogonal Frequency Division Multiple Access) system are provided to increase an inter-cell interference mitigating effect by adopting iterative reception technique using parallel interference cancellation to all cells of a terminal that has a single reception antenna in a multi-cell downlink. An apparatus for mitigating inter-cell interference includes parallel interference cancellers(110,210,310,410), LLR(Log Likelihood Ratio) creation blocks(120,220,320,420), de-interleavers(130,230,330,430), channel decoders(140,240,340,440), soft deciders(150,250,350,450), and channel estimation blocks(160,260,360,460). The parallel interference cancellers cancel inter-cell interference by re-spreading soft decision values of cells other than a self-cell. The LLR creation block creates channel LLRs per subcarrier required for the soft decision. The de-interleavers cancels channel concentration errors of channel soft outputs produced from the LLR creation blocks. The channel decoders decode outputs from the de-interleavers by channel decoding to thereby provide the decoded soft outputs. The soft deciders perform soft decision on a self-user symbol of a self-cell in which interferences by other users are mitigated. The channel estimation blocks perform iterative channel estimation using re-spread symbols of soft decision values produced from the soft deciders.
Abstract translation: 提供了一种用于减轻OFDMA（正交频分多址）系统中的小区间干扰的装置和方法，以通过采用使用对所有终端的终端的所有小区采用并行干扰消除的迭代接收技术来增加小区间干扰减轻效应 在多小区下行链路中的单个接收天线。 用于减轻小区间干扰的装置包括并行干扰消除器（110,210,310,410），LLR（对数似然比）创建块（120,220,320,420），解交织器（130,230,330,430），信道解码器（140,240,340,440），软判决器（150,250,350,450）和信道估计 块（160260360460）。 并行干扰消除器通过重新扩展除了自细胞之外的细胞的软判决值来消除小区间干扰。 LLR创建块创建软判决所需的每个子载波的信道LLR。 解交织器消除从LLR创建块产生的信道软输出的信道浓度误差。 信道解码器通过信道解码解码去交织器的输出，从而提供解码的软输出。 软决策者对自细胞的自用户符号执行软判决，其中减轻了其他用户的干扰。 信道估计块使用从软判决器产生的软判决值的重新扩展符号来执行迭代信道估计。
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公开(公告)号：KR1020080049957A
公开(公告)日：2008-06-05
申请号：KR1020060120584
申请日：2006-12-01
Applicant: 한국전자통신연구원
CPC classification number: H04L25/067 , H04B7/04 , H04B7/0848 , H04L25/03171 , H04B7/0854 , H04B7/0413 , H04L1/0054
Abstract: A decoder and a method for detecting a transmitting signal in an MIMO(Multi Input Multi Output) system are provided to reduce the amount of calculation for the detection of a maximum likelihood point significantly and reduce the selection range of grid points calculating the maximum likelihood point, thereby realizing the decoder with low complexity. A method for detecting a transmitting signal comprises the following steps of: performing SQRD(Sorted QR-Decomposition) of a matrix(B) indicating a channel status to calculate a unitary matrix(Q) and an upper triangular matrix(R)(S220); multiplying a receiving signal(Y) by the transposed matrix(Qt) of the Q to calculate a vector(S230); calculating an initial detection grid point and a minimum eigen value from the y and the R(S240,S250); and detecting a maximum likelihood point using the initial detection grid point and the minimum eigen value(S260).
Abstract translation: 提供一种用于检测MIMO（多输入多输出）系统中的发送信号的解码器和方法，以显着减少用于检测最大似然点的计算量，并减少计算最大似然点的网格点的选择范围 从而实现低复杂度的解码器。 一种用于检测发送信号的方法包括以下步骤：执行指示信道状态以计算酉矩阵（Q）和上三角矩阵（R）的矩阵（B）的SQRD（分类QR分解）（S220） ; 将接收信号（Y）乘以Q的转置矩阵（Qt）以计算向量（S230）; 从y和R计算初始检测网格点和最小本征值（S240，S250）; 以及使用初始检测网格点和最小本征值检测最大似然点（S260）。
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Patent Agency Ranking
公开(公告)号：KR1020080042679A
公开(公告)日：2008-05-15
申请号：KR1020070102609
申请日：2007-10-11
Applicant: 한국전자통신연구원
CPC classification number: H04L27/2607 , H04L27/2636 , H04L27/2644 , H04W72/0453
Abstract: A transmitter and a transmission method for extending a guard interval for an individual user equipment in an OFDMA(Orthogonal Frequency Division Multiple Access) system are provided to enhance performance of a specific equipment and performances of other equipments by extending the guard interval for the specific equipment. A transmitter for extending a guard interval for an individual user equipment in an OFDMA system includes a guard interval expansion processor(44), an up-sampling processing device(45), an interpolator(46), and a cyclic prefix(CP) inserting device(48). The guard interval expansion processor creates symbols having an extended guard interval by extending a guard interval for data to be transmitted to equipments estimated to have large delay spread and a large timing error on the basis of distance information between a base station and the equipment. The up-sampling processing device receives the symbols outputted from the guard interval extending processing device and performs up-sampling. The interpolator performs interpolation for the symbols up-sampled by the up-sampling processing device. The cyclic prefix inserting device inserts a cyclic prefix symbol into output data of a parallel/serial converter(47).
Abstract translation: 提供了一种用于在OFDMA（正交频分多址）系统中扩展单个用户设备的保护间隔的发射机和传输方法，以通过扩展特定设备的保护间隔来增强特定设备的性能和其他设备的性能 。 用于在OFDMA系统中为单个用户设备延长保护间隔的发射机包括保护间隔扩展处理器（44），上采样处理设备（45），内插器（46）和循环前缀（CP）插入 装置（48）。 保护间隔扩展处理器通过基于基站和设备之间的距离信息，将估计为具有大的延迟扩展的设备和大的定时误差扩展到要发送的数据的保护间隔来创建具有扩展保护间隔的符号。 上采样处理装置接收从保护间隔延长处理装置输出的符号，并进行上采样。 内插器对由上采样处理装置上采样的符号执行插值。 循环前缀插入装置将循环前缀符号插入到并行/串行转换器（47）的输出数据中。
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公开(公告)号：KR100795562B1
公开(公告)日：2008-01-21
申请号：KR1020060109886
申请日：2006-11-08
Applicant: 한국전자통신연구원
CPC classification number: H04B7/0413 , H04L25/0204 , H04L25/0246 , H04L25/03171
Abstract: A method for detecting a transmission signal by applying a division and detection scheme and a device thereof are provided to reduce calculation complexity for the signal detection while guaranteeing performance in detecting the signal whose strength is more than a set value by considering calculation amount for the performance in detecting the signal in an MIMO(Multiple Input Multiple Output) system. A device of a method for detecting a transmission signal by applying a division and detection scheme comprises a QR decomposition unit(100), a vector calculation unit(200), a division unit(300) and a detection unit(400). The QR decomposition unit(100) performs a resorted QR decomposition scheme for a matrix(B) which expresses a channel state, and obtains a unitary matrix(Q) and an upper triangle matrix(R). The vector calculation unit(200) multiplies a transpose of the unitary matrix(Q) by a received signal and calculates a vector. The division unit(300) divides the upper triangle matrix, inputted from the QR decomposition unit(100), into plural sub upper triangle matrixes, and also divides the vector, inputted from the vector calculation unit(200) in accordance with the divided plural sub upper triangle matrixes. The detection unit(400) detects mesh points in accordance with each divided sub vectors by using the plural sub upper triangle matrixes.
Abstract translation: 提供一种通过应用分割和检测方案及其装置来检测发送信号的方法，以减少信号检测的计算复杂度，同时通过考虑性能的计算量来确保强度大于设定值的信号的检测性能 在MIMO（多输入多输出）系统中检测信号。 通过应用分割和检测方案来检测发送信号的方法的装置包括QR分解单元（100），向量计算单元（200），分割单元（300）和检测单元（400）。 QR分解单元（100）对表示信道状态的矩阵（B）执行退化QR分解方案，并获得酉矩阵（Q）和上三角矩阵（R）。 矢量计算单元（200）将酉矩阵（Q）的转置乘以接收信号并计算矢量。 分割单元（300）将从QR分解单元（100）输入的上三角矩阵分割成多个子上三角矩阵，并且还根据分割的多个向量计算向量计算单元（200）输入的向量 子上三角矩阵。 检测单元（400）通过使用多个子上三角矩阵，根据每个划分的子向量来检测网格点。
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公开(公告)号：KR100790366B1
公开(公告)日：2008-01-03
申请号：KR1020060112379
申请日：2006-11-14
Applicant: 한국전자통신연구원 , 한양대학교 산학협력단
CPC classification number: H04B7/0857 , H04L25/0204 , H04L25/0248 , H04L25/0256 , H04L25/03242 , H04L2025/03426 , H04L2025/03624 , H04B7/0854
Abstract: A detection apparatus in a MIMO(Multi Input Multi Output) system and a method thereof are provided to reduce the volume of operations for decoding Rx signals of a receiving block while maintaining a desired system performance and to obtain a BER(Bit Error Rate) performance similar to an SD(Sphere Decoding) detection method. A detection apparatus in a MIMO system comprises the first detection unit(11), a candidate element determination unit(12), an Rx signal cancellation unit(13), and the second detection unit(14). The first detection unit(11) decodes an Rx signal. The candidate element determination unit(12) calculates an instantaneous SINR value for each of the elements of the decoded vector, compares each calculated instantaneous SINR value with a threshold, and determines elements to directly estimate Tx data from the decoded vector. The Rx signal cancellation unit(13) creates a signal for the determined elements, cancels the created signal from the initial Rx signal, and outputs a modified Rx signal. The second detection unit(14) receives the modified Rx signal from the Rx signal cancellation unit(13) and decodes it using a more delicate detecting method than the first detection unit(11).
Abstract translation: 提供了一种MIMO（多输入多输出）系统中的检测装置及其方法，用于减少用于解码接收块的Rx信号的操作量，同时保持期望的系统性能并获得BER（误码率）性能 类似于SD（球体解码）检测方法。 MIMO系统中的检测装置包括第一检测单元（11），候选元素确定单元（12），Rx信号消除单元（13）和第二检测单元（14）。 第一检测单元（11）对Rx信号进行解码。 候选元素确定单元（12）计算解码矢量的每个元素的瞬时SINR值，将每个计算的瞬时SINR值与阈值进行比较，并且确定从解码矢量直接估计Tx数据的元素。 Rx信号消除单元（13）产生用于所确定的元件的信号，从初始Rx信号中消除所产生的信号，并输出经修改的Rx信号。 第二检测单元（14）从Rx信号消除单元（13）接收修改的Rx信号，并且使用比第一检测单元（11）更精确的检测方法对其进行解码。
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公开(公告)号：KR100790365B1
公开(公告)日：2008-01-02
申请号：KR1020060112378
申请日：2006-11-14
Applicant: 한국전자통신연구원
CPC classification number: H04B7/0691 , H04B7/0854 , H04B7/0874 , H04B17/309 , H04L1/0026 , H04L1/06 , H04L1/1893 , H04B7/0417 , H04B7/0623 , H04B7/0632
Abstract: A method for retransmitting packets in a MIMO(Multi Input Multi Output) system is provided to increase decoding performance for retransmitted packets by selecting an antenna having a better channel state in the case of retransmitting packets for which decoding failed. A receiving block in a MIMO system comprises OFDM(Orthogonal Frequency Division Multiplex) demodulators(21), an MMSE(Minimum Mean-Squared Error) detector(22), a CQI(Channel Quality Information) calculator(23), a decoding part(24), and a packet canceller(25). The OFDM demodulators(21), which are in one-to-one correspondence with antennas, demodulate received RF signals. The MMSE detector(22) detects the channel states of the data inputted from the OFDM demodulators(21). The CQI calculator(23) calculates CQI for each channel detected by the MMSE detector(22) and feeds it back to a transmitting part. The decoding part(24) decodes data for each channel detected by the MMSE detector(22). The packet canceller(25) deletes the decoding-completed packets from the whole received signals.
Abstract translation: 提供了一种在MIMO（多输入多输出）系统中重传分组的方法，以通过在重新发送解码失败的分组的情况下选择具有更好信道状态的天线来增加重传分组的解码性能。 MIMO系统中的接收块包括OFDM（正交频分复用）解调器（21），MMSE（最小均方误差）检测器（22），CQI（信道质量信息）计算器（23），解码部分 24）和分组消除器（25）。 与天线一一对应的OFDM解调器（21）对接收到的RF信号进行解调。 MMSE检测器（22）检测从OFDM解调器（21）输入的数据的信道状态。 CQI计算器（23）计算由MMSE检测器（22）检测的每个信道的CQI，并将其馈送回发送部分。 解码部分（24）解码由MMSE检测器（22）检测的每个通道的数据。 分组消除器（25）从整个接收信号中删除解码完成分组。
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公开(公告)号：KR1020070112701A
公开(公告)日：2007-11-27
申请号：KR1020070011015
申请日：2007-02-02
Applicant: 한국전자통신연구원
CPC classification number: H04B7/15542 , H04B1/7103 , H04W16/00
Abstract: A repeater, a terminal, and a base station in a cellular system, and a method for relaying the base station with the terminal are provided to enable base stations to use the same range of resources while repeaters use resources orthogonal to resources used by neighboring repeaters, thereby magnifying resource usage efficiency. An interference terminal examiner(110) examines interfering terminals which apply interference to a repeater(100), and writes an interfering terminal list. A resource manager(130) perceives interference resource information allocated to the interfering terminals belonging to the interfering terminal list through resource allocation information of the base station, and perceives available resources except the interference resource information among resources allocated to the repeater. A repeater resource allocator(150) allocates some of or the whole available resources to the terminals.
Abstract translation: 提供蜂窝系统中的中继器，终端和基站，以及用于使终端与基站进行中继的方法，以使得基站能够使用相同的资源范围，而中继器使用与相邻中继器所使用的资源正交的资源 ，从而放大资源使用效率。 干扰终端检查器（110）检查对中继器（100）施加干扰的干扰终端，并写入干扰终端列表。 资源管理器（130）通过基站的资源分配信息感知分配给属于干扰终端列表的干扰终端的干扰资源信息，并且在分配给中继器的资源中感知除了干扰资源信息之外的可用资源。 中继器资源分配器（150）向终端分配一些或全部可用资源。
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