公开(公告)号：KR100785852B1

公开(公告)日：2007-12-14

申请号：KR1020060057629

申请日：2006-06-26

Applicant: 한국전자통신연구원 ,  인하대학교 산학협력단

Inventor： 송명선 ,  황성현 ,  고광진 ,  장경희 ,  박성호 ,  고상준 ,  허주 ,  김정주

IPC: H04L27/26 ,  H04B7/04 ,  H04L1/02 ,  H04B7/26

CPC classification number: H04L5/0058 ,  H04B7/0408 ,  H04L1/0003 ,  H04L1/0009 ,  H04L5/0023 ,  H04L5/0032 ,  H04L5/0037 ,  H04L5/0046 ,  H04B7/0617 ,  H04J11/00

Abstract: A sub channel allocation and fixed beam forming method for maximizing transmission efficiency in an orthogonal frequency division multiplexing access(OFDMA) system and an apparatus for using the same are provided to remove an interference signal with minimum costs by allocating a sub channel advantageous to each user device. A sub channel for each user device is determined, on the basis of the channel state of each user device. Beam index for each user device is determined, on the basis of position information and arrival direction information of each user device. An OFDM(Orthogonal Frequency Division Multiplexing) symbol is generated by mapping the symbol corresponding to each user device to the determined sub channel. The generated OFDM symbol is transmitted to wireless space by forming a beam according to the determined beam index.

Abstract translation: 提供了用于使正交频分复用接入（OFDMA）系统中的传输效率最大化的子信道分配和固定波束形成方法及其使用装置，以通过分配对每个用户有利的子信道来以最小的成本来去除干扰信号 设备。 基于每个用户设备的信道状态来确定每个用户设备的子信道。 基于每个用户设备的位置信息和到达方向信息来确定每个用户设备的光束索引。 通过将对应于每个用户设备的符号映射到所确定的子信道来生成OFDM（正交频分复用）符号。 所生成的OFDM符号通过根据确定的波束索引形成波束而被发送到无线空间。

公开(公告)号：KR100479864B1

公开(公告)日：2005-03-31

申请号：KR1020020073789

申请日：2002-11-26

Applicant: 한국전자통신연구원 ,  학교법인 중앙대학교

Inventor： 김광순 ,  장경희 ,  조용수 ,  김태곤

IPC: H04B7/26

CPC classification number: H04L27/2656 ,  H04L5/0023 ,  H04L5/0048 ,  H04L5/0053 ,  H04L27/2613 ,  H04L27/2657 ,  H04L27/2662 ,  H04L27/2678

Abstract: 직교 주파수 분할 다중 접속 기반의 셀룰러 시스템에서, 하향링크 신호의 한 프레임이 하나의 공통 슬롯과 복수의 트래픽 슬롯으로 이루어진다. 공통 슬롯은 동기화 프리앰블과 셀 탐색 프리앰블을 포함한다. 동기화 프리앰블은 시간 및 주파수 동기를 맞추기에 적합한 구조를 가지며, 셀 탐색 프리앰블은 셀 탐색에 적합한 구조를 가진다. 그리고 트래픽 슬롯에는 시간축과 주파수축으로 분산된 파일럿 심볼이 형성되어 있다. 이때, 먼저 OFDM 송신 신호의 주기적 프리픽스를 이용하여 초기 심볼 동기를 추정하고, 추정된 초기 심볼 동기와 동기화 프리앰블을 이용하여 프레임 동기를 한다. 다음, 동기화 프리앰블과 셀 탐색 프리앰블을 이용하여 시간 및 주파수 동기를 추정한다. 그리고 시간 및 주파수 동기가 맞추어진 후 셀 탐색 프리앰블을 이용하여 셀 탐색을 추정한다. 초기 동기화를 수행한 다음에, OFDM 송신 신호의 주기적 프리픽스를 이용하여 주파수 추적을 수행하고 동기화 프리앰블을 이용하여 심볼 동기 추적을 수행한다. 그리고 셀 탐색 프리앰블을 이용하여 미세 주파수 동기를 추적한다.

公开(公告)号：KR1020040085680A

公开(公告)日：2004-10-08

申请号：KR1020030020464

申请日：2003-04-01

Applicant: 한국전자통신연구원

Inventor： 김윤희 ,  김광순 ,  이상현 ,  황규종 ,  장경희

IPC: H04B7/04

CPC classification number: H04L1/0003 ,  H04B7/0417 ,  H04B7/0669 ,  H04B7/0689 ,  H04B7/0697 ,  H04L1/0009 ,  H04L1/0015 ,  H04L1/0026 ,  H04L1/0618 ,  Y02D70/1244 ,  Y02D70/142 ,  Y02D70/444

Abstract: PURPOSE: An adaptive transceiving device in a multiple antenna wireless communication system is provided to configure a main transmission mode based on a spatial multiplexing antenna transmission technique and a spatial coding antenna transmission technique, to adaptively change a coding rate, a modulation technique, and an antenna transmission technique according to an MIMO(Multiple Input Multiple Output) channel environment, thereby increasing transmission efficiency of data. CONSTITUTION: An adaptive transmission controller(2200) determines main transmission mode and sub transmission mode information. A transmission mode block(2100) transmits input data according to a data rate determined by the mode information. The transmission mode block(2100) comprises as follows. A channel coder(2110) codes the input data. A sub transmission mode 0 block(2130) performs a symbol mapping and an antenna mapping for a sub transmission mode 0. A sub transmission mode 1 block(2140) performs a symbol mapping and an antenna mapping for a sub transmission mode 1. A demultiplexer(2120) connects the channel coder(2110) with one of the sub transmission mode blocks(2130,2140). A multiplexer(2150) selects one of outputs of the two sub transmission mode blocks(2130,2140) according to the sub transmission mode information outputted from the adaptive transmission controller(2200).

Abstract translation: 目的：提供一种多天线无线通信系统中的自适应收发设备，用于配置基于空间复用天线传输技术和空间编码天线传输技术的主传输模式，自适应地改变编码率，调制技术和 根据MIMO（多输入多输出）信道环境的天线传输技术，从而提高数据的传输效率。 构成：自适应传输控制器（2200）确定主传输模式和子传输模式信息。 发送模式块（2100）根据由模式信息确定的数据速率发送输入数据。 传输模式块（2100）包括如下。 通道编码器（2110）对输入数据进行编码。 子传输模式0块（2130）执行子传输模式0的符号映射和天线映射。子传输模式1块（2140）执行子传输模式1的符号映射和天线映射。解复用器 （2120）将信道编码器（2110）与子传输模式块（2130,2140）之一连接。 复用器（2150）根据从自适应传输控制器（2200）输出的子传输模式信息，选择两个子传输模式块（2130,2140）的输出之一。

公开(公告)号：KR100448894B1

公开(公告)日：2004-09-18

申请号：KR1020020061199

申请日：2002-10-08

Applicant: 한국전자통신연구원 ,  한국과학기술원

Inventor： 이희수 ,  권재균 ,  이석규 ,  박수원 ,  장경희 ,  성단근

IPC: H04L27/26

Abstract: PURPOSE: A multi-dimensional ORHM(Orthogonal Resource Hopping Multiplexing) communication method-based digital communication system is provided to improve the channel decoding performance under the ORHM environment by installing an LLR(Log-Likelihood Ratio) converter at a secondary communication station. CONSTITUTION: A multi-dimensional ORHM communication method-based digital communication system includes an LLR converter(628) and a soft decision unit. The LLR converter(628) is located between a channel demodulator and a channel decoder of a receiving end. The LLR converter(628) is used for performing a LLR conversion process for an output value of the channel demodulator according to the resource hopping environment and inputting a result value into the channel decoder. The soft decision unit performs a soft decision process for an output value of the channel demodulator in order to limit the output value of the channel demodulator within a predetermined value.

Abstract translation: 目的：提供基于多维ORHM（正交资源跳跃多路复用）通信方法的数字通信系统，以通过在二级通信站处安装LLR（对数似然比）转换器来提高ORHM环境下的信道解码性能。 构成：一种基于多维ORHM通信方法的数字通信系统包括一个LLR转换器（628）和一个软判决单元。 LLR转换器（628）位于接收端的信道解调器和信道解码器之间。 LLR转换器（628）用于根据资源跳变环境对信道解调器的输出值执行LLR转换处理并将结果值输入到信道解码器中。 软判定单元对信道解调器的输出值执行软判定过程，以便将信道解调器的输出值限制在预定值内。

公开(公告)号：KR1020040056972A

公开(公告)日：2004-07-01

申请号：KR1020020083721

申请日：2002-12-24

Applicant: 한국전자통신연구원

Inventor： 이상현 ,  김윤희 ,  김광순 ,  장경희

IPC: H03M13/11

CPC classification number: H04L1/0057 ,  H03M13/1117 ,  H04L1/0045

Abstract: PURPOSE: A message-passing decoder for LDPC(Low-Density Parity-Check) codes is provided to perform a calculation process within a short period of time by sharing resources of an adder and a shifter. CONSTITUTION: A message-passing decoder for LDPC codes includes a log-likelihood ratio calculator, a parity-check message calculator, and a parity-checker. The log-likelihood ratio calculator is used for receiving codewords having continuous values from LDPC-coded block codes and calculating a log-likelihood ratio. The parity-check message calculator is used for calculating a bit message by using the log-likelihood ratio and a parity-check message. The parity-checker is used for checking the parity of the decoded codewords.

Abstract translation: 目的：提供一种用于LDPC（低密度奇偶校验）码的消息传递解码器，用于通过共享加法器和移位器的资源在短时间内执行计算处理。 构成：用于LDPC码的消息传递解码器包括对数似然比计算器，奇偶校验消息计算器和奇偶校验器。 对数似然比计算器用于从LDPC编码块码接收具有连续值的码字并计算对数似然比。 奇偶校验消息计算器用于通过使用对数似然比和奇偶校验消息来计算比特消息。 奇偶检验器用于检查解码码字的奇偶性。

公开(公告)号：KR1020040051904A

公开(公告)日：2004-06-19

申请号：KR1020020079598

申请日：2002-12-13

Applicant: 한국전자통신연구원

Inventor： 이석규 ,  김광순 ,  장경희

IPC: H04J11/00

CPC classification number: H04J11/0026 ,  H04L1/0618 ,  H04L5/0023 ,  H04L5/0046 ,  H04L5/0048 ,  H04L5/005 ,  H04L5/006 ,  H04L5/0085 ,  H04L5/06 ,  H04L25/0204 ,  H04L25/0226 ,  H04L27/2602

Abstract: PURPOSE: A method and an apparatus for constructing the signal to down link of a cellular system based on OFDMA are provided to reduce the transmission power consumption and the overhead by arranging appropriate pilot symbols. CONSTITUTION: A method and an apparatus for constructing the signal to down link of a cellular system based on OFDMA includes the steps of: (s210) performing the encoding, interleaving and symbol mapping to the data of the common channel and the control channel and disposing a basic pilot symbol required to the demodulation of the common channel and the control channel to the time, frequency and antenna; (s220) determining the transmission method of each user in response to the moving speed, channel information and traffic demand by receiving the data to be transmitted to the traffic channel of the user; (s230) determining the additional pilot symbol additionally required for demodulating the traffic channel in response to the transmission method and the moving speed; and (s240) performing the encoding, interleaving and symbol mapping to the data of the traffic channel in response to the transmission method and disposing the mapped symbol and the additional pilot symbol in response to the frequency and antenna.

Abstract translation: 目的：提供一种用于构建基于OFDMA的蜂窝系统的信号下行链路的方法和装置，以通过布置适当的导频符号来减少传输功耗和开销。 构成：用于构建基于OFDMA的蜂窝系统的信号向下链路的方法和装置包括以下步骤：（s210）对公共信道和控制信道的数据进行编码，交织和符号映射，并且处理 将公共信道和控制信道解调到时间，频率和天线所需的基本导频符号; （s220）通过接收要发送到用户的业务信道的数据来响应于移动速度，信道信息和业务需求来确定每个用户的传输方法; （s230）响应于所述传输方法和所述移动速度确定另外需要解调所述业务信道的附加导频符号; 和（s240）响应于传输方法执行编码，交织和符号映射到业务信道的数据，并响应于频率和天线布置映射符号和附加导频符号。

公开(公告)号：KR1020040041191A

公开(公告)日：2004-05-17

申请号：KR1020020069083

申请日：2002-11-08

Applicant: 한국전자통신연구원

Inventor： 김경석 ,  이석규 ,  장경희 ,  이원철 ,  김홍철 ,  박재형

IPC: H04B7/04

Abstract: PURPOSE: A radio transmitting/receiving system and a radio transmitting/receiving method are provided to obtain a maximum space diversity gain by ensuring a high transmission ratio and removing correlation between channels. CONSTITUTION: A radio transmitting/receiving system comprises a transmitting unit(10) and a receiving unit(20). The transmitting unit includes a signal converter(11) for converting an input bit sequence into N-number of sub sequences; a channeling unit(13) for channeling the sub sequences by providing channeling codes to each of sub sequences; a transmitting beam forming unit(14) for providing weight values for formation of transmitting beam to the channeled sub sequences; and N-number of transmitting antennas(15) for transmitting signals of the channels provided with the weight values. The receiving unit includes M-number of receiving antennas(21) for receiving the signals transmitted from the transmitting antennas; a receiving beam forming unit(22) for providing weight values for formation of receiving beam to the signals output from the receiving antennas; an inverse channeling unit(23) for restoring sub sequences by inversely channeling the signals provided with the weight values; and a signal converter(26) for coupling the restored sub sequences and outputting an input bit sequence.

Abstract translation: 目的：提供无线电发射/接收系统和无线电发射/接收方法，通过确保高传输比和消除信道之间的相关性来获得最大空间分集增益。 构成：无线发送/接收系统包括发送单元（10）和接收单元（20）。 发送单元包括用于将输入比特序列转换成N个子序列的信号转换器（11） 通道单元（13），用于通过向子序列中的每一个提供频道代码来引导子序列; 发射波束形成单元（14），用于提供用于形成发射波束到所述通道子序列的权重值; 以及N个发送天线（15），用于发送具有权重值的信道的信号。 接收单元包括M个用于接收从发送天线发送的信号的接收天线（21）; 接收波束形成单元（22），用于向从所述接收天线输出的信号提供用于形成接收波束的权重值; 反向信道单元（23），用于通过反向引导提供有权重值的信号来恢复子序列; 以及用于耦合所恢复的子序列并输出输入比特序列的信号转换器（26）。

公开(公告)号：KR1020030055652A

公开(公告)日：2003-07-04

申请号：KR1020010085694

申请日：2001-12-27

Applicant: 한국전자통신연구원

Inventor： 송문칠 ,  장경희 ,  유창완

IPC: H04B1/7115 ,  H04J13/18

CPC classification number: H04B1/7115 ,  H04B2201/70701

Abstract: PURPOSE: A rake receiver capable of compensating channel estimation delay is provided to use a finite impulse response filter, and to install a data buffer for buffering data during channel estimation and compensation periods, thereby according a channel value by a pilot signal from a shared pilot channel or a dedicated physical control channel with demodulated data. CONSTITUTION: Many fingers(100) estimate and compensate channels by spreading receiving signals, and output symbols. A combiner(200) combines the outputted symbols. A decoder(300) decodes output data of the combiner(200). Each of the fingers(100) comprises as follows. A despreader(110) receives wireless signals including a shared pilot signal and a traffic signal, and despreads the wireless signals. A channel estimating device(A) selectively outputs a channel estimation value estimated by the shared pilot signal and a dedicated physical control pilot signal, and buffers a traffic signal of the despread signals to output the buffered signal. An multiplier(160) multiplies the channel estimation value by the buffered value, and outputs a data value whose channel influence is compensated.

Abstract translation: 目的：提供能够补偿信道估计延迟的瑞克接收机，以使用有限脉冲响应滤波器，并且在信道估计和补偿周期期间安装用于缓冲数据的数据缓冲器，由此根据来自共享导频的导频信号的信道值 信道或具有解调数据的专用物理控制信道。 构成：许多手指（100）通过扩展接收信号和输出符号来估计和补偿信道。 组合器（200）组合输出的符号。 解码器（300）解码组合器（200）的输出数据。 每个手指（100）包括如下。 解扩器（110）接收包括共享导频信号和业务信号的无线信号，并对无线信号进行解扩。 信道估计装置（A）选择性地输出由共享导频信号和专用物理控制导频信号估计的信道估计值，并缓存解扩信号的业务信号以输出缓冲信号。 乘法器（160）将信道估计值乘以缓冲值，并输出其信道影响被补偿的数据值。

公开(公告)号：KR1020010009587A

公开(公告)日：2001-02-05

申请号：KR1019990028020

申请日：1999-07-12

Applicant: 한국전자통신연구원

Inventor： 장경희 ,  박형래 ,  경문건 ,  신응순 ,  강양기 ,  박윤옥

IPC: H01Q3/40 ,  H01Q21/00

CPC classification number: H04B1/7115 ,  H01Q3/2605 ,  H04B1/709 ,  H04B7/086

Abstract: PURPOSE: An efficient structure demodulator is provided to utilize not only information in a time area but also information in a space area. CONSTITUTION: A correlator bank(112) receives a digital base band signal(101) to calculate a correlation with a local code sequence. A beam forming calculator(102) receives the digital base band signal(101) to calculate a beam forming weight factor based upon the correlated value of the correlator bank(112). A beam forming multiplier(110) for a finger receives the digital base band signal(101) to multiply the beam forming weight factor(115) and then process a summing. A beam forming multiplier(104) for a searcher receives the digital base band signal(101) to multiply the beam forming weight factor(103) and then process a summing. A searcher bank(106) receives an output signal from the beam forming multiplier(104). A finger bank(109) receives an output signal from the beam forming multiplier(110) to perform a multipath tracking based upon an output signal(108) of the searcher bank(106), and supply a multipath tracking signal to the correlator bank(112). A multipath coupler(117) receives a multipath tracking result signal from the finger bank(109) to process a multipath coupling and output a result to a decoder.

Abstract translation: 目的：提供一种有效的结构解调器，不仅可以利用时区中的信息，还可以利用空间区域中的信息。 构成：相关器组（112）接收数字基带信号（101）以计算与本地码序列的相关性。 波束形成计算器（102）接收数字基带信号（101），以基于相关器组（112）的相关值来计算波束形成权重因子。 用于手指的波束形成乘法器（110）接收数字基带信号（101）以乘以波束形成权重因子（115），然后处理求和。 用于搜索器的波束形成乘法器（104）接收数字基带信号（101）以乘以波束形成权重因子（103），然后处理求和。 搜索器组（106）从波束形成乘法器（104）接收输出信号。 手指组（109）从波束形成乘法器（110）接收输出信号，以根据搜索器组（106）的输出信号（108）进行多径跟踪，并向相关器存储体提供多径跟踪信号 112）。 多径耦合器（117）从手指组（109）接收多径跟踪结果信号，以处理多径耦合并将结果输出到解码器。

公开(公告)号：KR101386240B1

公开(公告)日：2014-04-17

申请号：KR1020100007879

申请日：2010-01-28

Applicant: 한국전자통신연구원 ,  인하대학교 산학협력단

Inventor： 장경희 ,  모하이센,마나 ,  안홍선 ,  백영석 ,  구본태

IPC: H04B7/04 ,  H04B1/06 ,  H04L27/00

Abstract: 본 발명은 공간 다중화 방식의 다중 안테나 시스템에서 성상도 집합 그룹핑을 이용한 신호 검출 방법에 관한 것으로, 심볼 후보 집합인 성상도 집합에 대한 그룹핑을 통해 복수의 부분 집합으로 분할하는 단계; QRDM 알고리즘의 트리 검색 과정을 복수의 부분 검출 단계로 분할하는 단계; 및 상기 분할된 복수의 부분 검출 단계를 병렬적 또는 반복적으로 수행하는 단계를 포함하여 구성된다.