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

Inventor： 남준영 ,  김성락 ,  정현규

IPC: H04B7/26 ,  H04L27/26

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。

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

Inventor： 박인숙 ,  안재영 ,  김성락 ,  정현규

IPC: H04B7/04 ,  H04B7/08

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）。

公开(公告)号：KR100657506B1

公开(公告)日：2006-12-13

申请号：KR1020040053378

申请日：2004-07-09

Applicant: 한국전자통신연구원 ,  주식회사 케이티 ,  에스케이브로드밴드주식회사 ,  삼성전자주식회사 ,  주식회사 케이티프리텔 ,  에스케이텔레콤 주식회사

Inventor： 임형수 ,  권동승 ,  김성락 ,  최인경 ,  예충일 ,  조성철 ,  이유로 ,  오종의 ,  황승구 ,  윤순영 ,  성상훈 ,  조재희 ,  황인석 ,  허훈

IPC: H04L27/26 ,  H04J11/00

CPC classification number: H04L27/2613

Abstract: 본 발명은 직교주파수 분할 다중 접속(Orthogonal Frequency Division Multiple Access, OFDMA) 방식을 사용하는 이동형 데이터 통신 시스템의 하향 링크 프레임 구조 설계에 이용될 수 있는 OFDMA 신호 방식을 위한 하향 링크 프레임 구성 방법에 관한 것이다. 이 하향 링크 프레임을 구성하기 위해 먼저 하향 링크 프레임의 앞부분에 하나의 프리앰블을 배치하고, 프리앰블 다음에 복수의 데이터 심벌을 배치한다. 다음, 하향 링크 프레임 전반에 걸쳐 일정 구간 주기로 반복해서 상기 데이터 심벌들 사이에 복수의 파일럿 심벌을 삽입한다. 본 발명에 따르면, 프리앰블과 파일럿 심벌을 이용한 빠른 채널 변화를 추적 가능하게 하며, 또한 인접 셀 간의 간섭이 최소화 및 평준화되도록 함으로써 주파수 재사용률을 1로 하여 다수의 셀의 배치 설계를 용이하게 할 수 있다.
OFDMA, 하향 링크, 프레임, 프리앰블, 파일럿, 심벌, 채널 추정, 이동 통신

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

Inventor： 최인경 ,  김성락 ,  최진규

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。

公开(公告)号：KR100461547B1

公开(公告)日：2004-12-16

申请号：KR1020020064674

申请日：2002-10-22

Applicant: 한국전자통신연구원 ,  한국과학기술원

Inventor： 김성락 ,  정영호 ,  최인경 ,  이용훈

IPC: H04B7/04

CPC classification number: H04B7/0413 ,  H04B7/0613 ,  H04B7/0851 ,  H04B7/0854

Abstract: A transmission apparatus for a DS/CDMA system including a multiple-input multiple output MIMO antenna system is disclosed. The apparatus includes a transmitter for transmitting data by applying a different scramble code to each transmitted data through a plurality of transmitting antennas. The apparatus also includes a receiver for receiving the transmitted data by obtaining a diversity gain based on the maximum order of the diversity in order to effectively detect the data. The present invention achieves an excellent detection performance by receiving data with a full order of diversity, which is a multiple of the number of receiving antennas and the number of multipath, without complicated operation such as a decision feed equalizer.

Abstract translation: 公开了一种用于包括多输入多输出MIMO天线系统的DS / CDMA系统的传输设备。 该设备包括发射机，用于通过将多个发射天线应用到每个发射数据的不同扰码来发射数据。 该装置还包括接收器，用于通过基于分集的最大次序获得分集增益来接收发送的数据，以有效地检测数据。 本发明通过接收具有接收天线数量和多径数量的整数倍的全分集数据的优异检测性能，而不需要诸如决策反馈均衡器的复杂操作。

公开(公告)号：KR100450849B1

公开(公告)日：2004-10-01

申请号：KR1020020052764

申请日：2002-09-03

Applicant: 한국전자통신연구원 ,  한국과학기술원

Inventor： 최인경 ,  정영호 ,  김성락 ,  홍승철 ,  이용훈

IPC: H04B1/711

CPC classification number: H04B1/71055 ,  H04B1/7115 ,  H04B7/04 ,  H04B7/0854 ,  H04L2025/03605

Abstract: An adaptive interference suppression receiver for a DS/CDMA system includes: input signal generators outputting a part of received signals of receiver antennas that has a coding block's transfer code; adaptive filter blocks filtering a complex signal output from the input signal generators with a tap weight updated based on a constraint MMSE criterion and estimating phase and amplitude components of a specific user channel using the filtering output signal to generate a channel-estimated signal; a signal restorer combining the channel-estimated signal and the filtering output signal and restoring an original signal; a signal selector for selecting known training data signal or the restored signal; and error generators comparing the channel-estimated signal and the filtering output signal and calculating an error between the two signals.

Abstract translation: 用于DS / CDMA系统的自适应干扰抑制接收机包括：输入信号发生器，输出接收天线的接收信号的一部分，其具有编码块的传送码; 自适应滤波器块利用基于约束MMSE准则更新的抽头权重对从输入信号生成器输出的复信号进行滤波，并且使用滤波输出信号来估计特定用户信道的相位和振幅分量以生成信道估计信号; 信号恢复器，将信道估计信号和滤波输出信号组合并恢复原始信号; 信号选择器，用于选择已知的训练数据信号或恢复的信号; 以及误差生成器，将信道估计信号与滤波输出信号进行比较并计算两个信号之间的误差。

公开(公告)号：KR100415550B1

公开(公告)日：2004-01-24

申请号：KR1020010061537

申请日：2001-10-05

Applicant: 한국전자통신연구원

Inventor： 최인경 ,  김성락

IPC: H04B1/7103

CPC classification number: H04B1/71075

Abstract: An interference cancellation receiver reduces the multiple access interference in a CDMA system. The receiver includes a demodulator for receiving a residual signal or a received signal from a calling terminal as an over-sample unit baseband spread signal and down-sampling the baseband spread signal on a chip basis to output a demodulation signal, a regenerator for performing a bit decision for the demodulation signal, regenerating signals through the channelization and scrambling and converting the regenerated signals to signals on the over-sample basis, an adder for summing up the over-sample unit signals, a filter for filtering the summed-up signal to output a band spread signal, a subtractor for subtracting the band spread signal from the received signal to output the residual signal and a delay for keeping timing with the residual signal by delaying the chip unit signals outputted from the regenerator.

Abstract translation: 干扰消除接收机减少了CDMA系统中的多址干扰。 接收机包括：解调器，用于接收来自呼叫终端的残留信号或接收信号作为过采样单位基带扩展信号，并基于码片对基带扩展信号进行下采样以输出解调信号;再生器，用于执行 通过信道化和加扰重新生成信号，并将重新生成的信号转换成过采样信号;加法器，用于求和过采样单元信号;滤波器，用于将求和信号滤波为 输出频带扩展信号;减法器，用于从接收信号中减去频带扩展信号以输出剩余信号;延迟器，用于通过延迟从再生器输出的芯片单元信号来保持与剩余信号的定时。

公开(公告)号：KR100384897B1

公开(公告)日：2003-05-23

申请号：KR1020010036184

申请日：2001-06-25

Applicant: 한국전자통신연구원

Inventor： 김성락 ,  최진호 ,  정영호 ,  홍승철 ,  이용훈

IPC: H04B1/7115

Abstract: PURPOSE: An adaptive rake receiving device having at least one restriction in a mobile communication system is provided to estimate each multi-path element channel phase and amplitudes by using an adaptive filter output, thereby removing all multi-user interferences to have channel estimated values without a shit from the adaptive filter output. CONSTITUTION: Transmission delay compensating buffers(100,200) collect parts only occupied by transmission codes of each multi-path element, and transmit the collected parts to adaptive filters(110,210). The adaptive filers(110,210) filter complex receiving signals according to tab weight controlled at predetermined intervals. Channel estimators(130,230) estimate phase elements and amplitude elements of specific user channels. A signal restorer couples channel estimated result signals of the channel estimators(130,230) with a filtered receiving signal applied from the adaptive filters(110,210), and restores to original signals. A selector selects one of the restored signals. A reference signal generator generates a reference signal by using the signal of the selector and the channel estimated result signals. An error calculator calculates an error between the reference signal and the filtered receiving signal. A tap weight controller controls the tab weight on the basis of a constraint MMSE criterion.

Abstract translation: 目的：提供一种在移动通信系统中具有至少一个限制的自适应瑞克接收设备，用于通过使用自适应滤波器输出来估计每个多径元件信道相位和振幅，由此消除所有多用户干扰以具有信道估计值而无需 一个来自自适应滤波器输出的狗屎。 构成：传输延迟补偿缓冲器（100,200）收集仅由每个多路径元件的传输码占用的部分，并将收集的部分传输到自适应滤波器（110,210）。 自适应滤波器（110,210）根据以预定间隔控制的标签权重来过滤复杂的接收信号。 信道估计器（130,230）估计特定用户信道的相位元素和幅度元素。 信号恢复器将信道估计器（130,230）的信道估计结果信号与从自适应滤波器（110,210）施加的滤波后的接收信号相耦合，并恢复成原始信号。 选择器选择一个恢复的信号。 参考信号生成器通过使用选择器的信号和信道估计结果信号来生成参考信号。 误差计算器计算参考信号和滤波后的接收信号之间的误差。 轻拍重量控制器基于约束MMSE标准来控制标签权重。

公开(公告)号：KR1020020039782A

公开(公告)日：2002-05-30

申请号：KR1020000069593

申请日：2000-11-22

Applicant: 한국전자통신연구원

Inventor： 김성락 ,  최인경 ,  김영화

IPC: H04B1/7117 ,  H04B1/7103

CPC classification number: H04B1/7107

Abstract: PURPOSE: An apparatus and a method for canceling a group-wise parallel interference of a CDMA system with a multiple transmission speed are provided to cancel a group-wise parallel interference by determining ranks of signals using output values of a maximal ratio combiner received to each finger and power measured values of the fingers, and by grouping the fingers according to the ranks. CONSTITUTION: A received intermediate frequency signal(100) is generated through a receiver antenna, a carrier frequency demodulator and an analog to digital converter. The received signal(100) is converted into a baseband signal(107). After that, the baseband signal(107) is stored in a buffer(102). The signal(107) is inputted to an adder(106). A DCB(Despreading and Channel estimation Block) is composed of a timing circuit(108), a PN code generator(109), a demodulator(111) and a channel and power estimator(112). The synchronization acquisition circuit(108) performs a processing of PN code acquisition and tracking using the signal(107). The PN code generator(109) generates a PN code(110) using synchronization acquisition information outputted from the circuit(108).

Abstract translation: 目的：提供一种用于消除具有多个传输速度的CDMA系统的分组并行干扰的装置和方法，以通过使用接收到每个信道的最大比组合器的输出值确定信号等级来消除群组并行干扰 手指和功率测量值的手指，并根据等级对手指进行分组。 构成：通过接收机天线，载波频率解调器和模数转换器产生接收到的中频信号（100）。 接收信号（100）被转换成基带信号（107）。 之后，将基带信号（107）存储在缓冲器（102）中。 信号（107）被输入到加法器（106）。 DCB（解扩和信道估计块）由定时电路（108），PN码发生器（109），解调器（111）和信道和功率估计器（112）组成。 同步采集电路（108）使用信号（107）执行PN码采集和跟踪处理。 PN码发生器（109）使用从电路（108）输出的同步获取信息产生PN码（110）。

公开(公告)号：KR100281403B1

公开(公告)日：2001-02-01

申请号：KR1019980051097

申请日：1998-11-26

Applicant: 한국전자통신연구원

Inventor： 강양기 ,  경문건 ,  박윤옥 ,  장경희 ,  김성락

IPC: H04B7/26

Abstract: 본 발명은 소프트 핸드오프 성공률을 높이고, 안테나 이득을 증대시킬 수 있는 코드 분할 다중 접속 방식(CDMA) 이동 통신 시스템의 섹터 안테나 시스템 을 제공하는데 그 목적이 있다.
본 발명에 따르면, 다수의 섹터로 분할된 셀 구조를 가지는 코드 분할 다중 접속 방식(CDMA) 이동 통신 시스템의 섹터 안테나 시스템에 있어서, 3개 이상의 셀의 경계선이 서로 만나는 지점을 제외하고, 각각의 셀과 셀사이의 경계선에서 각각의 셀에 대한 입사각이 서로 일치하지 않고; 서로 인접하는 셀과 셀 내부의 섹터 경계선이 서로 만나지 않도록 설치된 것을 특징으로 하는 섹터 안테나 시스템이 제공된다.