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    • 2. 发明公开
    • 시변 채널 왜곡 제거 기능을 가지는 주파수 분할 다중시스템에서의 송수신 방법
    • 用于减少OFDM系统中时变信道引起的失真的发送和接收方法
    • KR1020040046967A
    • 2004-06-05
    • KR1020020075014
    • 2002-11-28
    • 한국전자통신연구원학교법인 중앙대학교
    • 장경희김윤희조용수박경원
    • H04L27/26
    • H04W52/16H04L1/0618H04L25/0204H04L27/2647H04W52/42
    • PURPOSE: A transmitting and receiving method for reducing distortion caused by a time-varying channel in an OFDM system is provided to reduce the influence due to the time-varying channel by analyzing mathematically the influence caused by the time-varying channel. CONSTITUTION: A transmitting and receiving method for reducing distortion caused by a time-varying channel(52) in an OFDM system includes a process for generating a group, a process for assigning a weight value, and a process for transmitting data. The process for generating the group is to form one group by extracting neighboring sub-channels of M number from the sub-channels of N number. The process for assigning the weight value is to assign weight values to transmission data of the sub-channels of the group. The process for transmitting data is to transmit the transmission data in group units.
    • 目的:提供一种用于减少由OFDM系统中的时变信道引起的失真的发送和接收方法,以通过数学分析来减少由时变信道引起的影响而引起的时变信道的影响。 构成:用于减少由OFDM系统中的时变信道(52)引起的失真的发送和接收方法包括用于生成组的处理,用于分配权重值的处理和用于发送数据的处理。 用于生成组的处理是通过从N个子信道中提取M个数的相邻子信道来形成一个组。 用于分配权重值的过程是将权重值分配给组的子信道的发送数据。 发送数据的处理是以组为单位发送发送数据。
    • 5. 发明公开
    • 이동 통신 시스템에서의 하향링크 신호의 구성 방법과동기화 방법 및 그 장치 그리고 이를 이용한 셀 탐색 방법
    • 用于在移动通信系统中配置下行链路信号的方法,同步方法和设备,以及使用其的小区搜索方法
    • KR1020040045996A
    • 2004-06-05
    • KR1020020073789
    • 2002-11-26
    • 한국전자통신연구원학교법인 중앙대학교
    • 김광순장경희조용수김태곤
    • H04B7/26
    • H04L27/2656H04L5/0023H04L5/0048H04L5/0053H04L27/2613H04L27/2657H04L27/2662H04L27/2678
    • PURPOSE: A method for configuring a downlink signal in a mobile communication system, a synchronizing method and apparatus, and a cell search method using the same are provided to allow a terminal to perform synchronization and search a cell by generating a preamble and pilot structure suitable for a downlink. CONSTITUTION: Initial symbol synchronization is estimated by using the periodic CP(Cyclic Prefix) of an OFDM(Orthogonal Frequency Division Multiplexing) transmission signal(S210). Frame synchronization is estimated by using the estimated initial symbol synchronization and a synchronization preamble(S220). Time and frequency synchronization are estimated by using the synchronization preamble and a cell search preamble(S230). A cell search is estimated by using the cell search preamble(S240). A frequency tracking is performed by using a phase difference between the CP of an OFDM transmission signal and a valid OFDM symbol(S250). Symbol synchronization tracking is performed by using the synchronization preamble(S260) and fine frequency synchronization is tracked by using the cell search preamble(S270).
    • 目的:提供一种用于在移动通信系统中配置下行链路信号的方法,同步方法和装置以及使用其的小区搜索方法,以允许终端通过生成前导码和导频结构来执行同步和搜索小区 用于下行链路。 构成:通过使用OFDM(正交频分复用)传输信号的周期性CP(循环前缀)来估计初始符号同步(S210)。 通过使用估计的初始符号同步和同步前导码来估计帧同步(S220)。 通过使用同步前导码和小区搜索前导码来估计时间和频率同步(S230)。 通过使用小区搜索前导码来估计小区搜索(S240)。 通过使用OFDM传输信号的CP和有效OFDM符号之间的相位差来执行频率跟踪(S250)。 通过使用同步前导码来执行符号同步跟踪(S260),并且通过使用小区搜索前导码跟踪精细频率同步(S270)。
    • 8. 发明公开
    • 다중 안테나 무선 통신 시스템에서의 적응 송수신 방법 및그 장치
    • 多天线无线通信系统中的自适应收发方法及其设备,能够根据通道环境改变适应性编码率,调制技术和天线传输技术
    • KR1020040085680A
    • 2004-10-08
    • KR1020030020464
    • 2003-04-01
    • 한국전자통신연구원
    • 김윤희김광순이상현황규종장경희
    • H04B7/04
    • H04L1/0003H04B7/0417H04B7/0669H04B7/0689H04B7/0697H04L1/0009H04L1/0015H04L1/0026H04L1/0618Y02D70/1244Y02D70/142Y02D70/444
    • 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).
    • 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。
    • 9. 发明授权
    • 다차원 직교 자원 도약 다중화 통신 방식에 기반한 디지털통신 시스템
    • 다차원직교자원도약다중화통신방신에기반한디지털통신시스템
    • KR100448894B1
    • 2004-09-18
    • KR1020020061199
    • 2002-10-08
    • 한국전자통신연구원한국과학기술원
    • 이희수권재균이석규박수원장경희성단근
    • H04L27/26
    • 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.
    • 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。
    • 10. 发明公开
    • 계산이 간단한 저밀도 패리티 검사 부호를 위한 메시지 전달 복호기
    • 用于LDPC码的消息传递解码器
    • KR1020040056972A
    • 2004-07-01
    • KR1020020083721
    • 2002-12-24
    • 한국전자통신연구원
    • 이상현김윤희김광순장경희
    • H03M13/11
    • H04L1/0057H03M13/1117H04L1/0045
    • 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.
    • 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。