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    • 1. 发明授权
    • OFDM 기반 셀룰러 시스템에서의 채널 추정 방법 및장치
    • OFDM细胞系统中的信道估计
    • KR100776646B1
    • 2007-11-19
    • KR1020060095813
    • 2006-09-29
    • 한국전자통신연구원
    • 서방원안재영이성은홍대식
    • H04L27/26
    • H04L25/0212H04L27/2628H04L27/2675
    • A channel estimating method and apparatus in an OFDM(Orthogonal Frequency Division Multiplexing) cellular system is provided to improve a channel estimating performance by estimating and eliminating mutual interference in a channel estimating process. An estimation response to a high-density pilot symbol is calculated by extracting a subcarrier of the high-density pilot symbol(501). The calculated estimation response is divided into several sections at a predetermined interval to calculate a division response in each divided section(504). A channel response to the high-density pilot symbol is calculated by using the first division response(505). An estimation response to a low-density pilot symbol is calculated by extracting a subcarrier of the low-density pilot symbol(506,508). A channel response to the low-density pilot symbol is calculated by subtracting an accumulated value of the division response from the estimation response of the low-density pilot symbol(509).
    • 提供OFDM(正交频分复用)蜂窝系统中的信道估计方法和装置,以通过估计和消除信道估计过程中的相互干扰来改善信道估计性能。 通过提取高密度导频符号(501)的子载波来计算对高密度导频符号的估计响应。 将计算出的估计响应以预定间隔分成几个部分,以计算每个分割部分(504)中的分割响应。 通过使用第一除法响应(505)来计算对高密度导频符号的信道响应。 通过提取低密度导频符号(506,508)的子载波来计算对低密度导频符号的估计响应。 通过从低密度导频符号(509)的估计响应中减去分频响应的累积值来计算对低密度导频符号的信道响应。
    • 3. 发明授权
    • 티디디-씨디엠에이 시스템용 다중사용자 간섭제거 수신기및 간섭제거 제어방법
    • 티디디 - 씨디엠에이시스템용다중사용자간섭제거수신기및간섭제거제어방티
    • KR100391293B1
    • 2003-07-12
    • KR1020010051365
    • 2001-08-24
    • 한국전자통신연구원
    • 홍대식고균병정인철조대순조성철이유로권동승경문건
    • H04B1/7107
    • PURPOSE: A multiuser interference cancellation receiver for a TDD-CDMA(Time Division Duplex-Code Division Multiple Access) system and a method for controlling the interference cancellation are provided to perform interference cancellation for signals having high power values even when differences of signal power values are wide among users, so as to minimize errors in the detection of user signals having low signal power values. CONSTITUTION: A data extractor(100) extracts data from received signals and outputs the extracted data. A signal delay part(200) delays the signals outputted from the data extractor(100) during a predetermined time, and outputs the delayed signals. An interference cancellation selection part(300) extracts midamble signal channels from received original signals, to select and output users of the subject of the first interference cancellation. The first step interference cancellation block(400) receives data of the received signals from the data extractor(100), to perform the first parallel interference cancellation for the selected users of the first interference cancellation subject and output reproduction signals. And the second step interference cancellation block(500) receives data of the received signals delayed during the predetermined time and outputted from the signal delay part(200), to perform the second parallel interference cancellation using the first reproduction signals outputted from the first step interference cancellation block(400).
    • 目的:提供一种用于TDD-CDMA(时分双工码分多址)系统的多用户干扰消除接收机和一种用于控制干扰消除的方法,以便即使当信号功率值 在用户中很宽,以便最小化检测具有低信号功率值的用户信号时的错误。 构成:数据提取器(100)从接收信号中提取数据并输出提取的数据。 信号延迟部分(200)在预定时间内延迟从数据提取器(100)输出的信号,并且输出延迟的信号。 干扰消除选择部分(300)从接收到的原始信号中提取中置码信号信道,以选择并输出第一干扰消除的对象的用户。 第一级干扰消除块(400)接收来自数据提取器(100)的接收信号的数据,以对第一干扰消除主体的所选用户执行第一并行干扰消除,并输出再现信号。 并且第二级干扰消除块(500)接收在预定时间内延迟并从信号延迟部分(200)输出的接收信号的数据,以使用从第一级干扰输出的第一再现信号来执行第二并行干扰消除 取消块(400)。
    • 6. 发明公开
    • 티디디-씨디엠에이 시스템용 다중사용자 간섭제거 수신기및 간섭제거 제어방법
    • 用于TDD-CDMA系统的多媒体干扰消除接收机和用于控制干扰消除的方法
    • KR1020030017193A
    • 2003-03-03
    • KR1020010051365
    • 2001-08-24
    • 한국전자통신연구원
    • 홍대식고균병정인철조대순조성철이유로권동승경문건
    • H04B1/7107
    • H04B1/71075H04B1/7093
    • PURPOSE: A multiuser interference cancellation receiver for a TDD-CDMA(Time Division Duplex-Code Division Multiple Access) system and a method for controlling the interference cancellation are provided to perform interference cancellation for signals having high power values even when differences of signal power values are wide among users, so as to minimize errors in the detection of user signals having low signal power values. CONSTITUTION: A data extractor(100) extracts data from received signals and outputs the extracted data. A signal delay part(200) delays the signals outputted from the data extractor(100) during a predetermined time, and outputs the delayed signals. An interference cancellation selection part(300) extracts midamble signal channels from received original signals, to select and output users of the subject of the first interference cancellation. The first step interference cancellation block(400) receives data of the received signals from the data extractor(100), to perform the first parallel interference cancellation for the selected users of the first interference cancellation subject and output reproduction signals. And the second step interference cancellation block(500) receives data of the received signals delayed during the predetermined time and outputted from the signal delay part(200), to perform the second parallel interference cancellation using the first reproduction signals outputted from the first step interference cancellation block(400).
    • 目的:提供用于TDD-CDMA(时分双工码分多址)系统的多用户干扰消除接收机和用于控制干扰消除的方法,以便即使在信号功率值差 在用户中广泛,以便最小化检测具有低信号功率值的用户信号的错误。 构成:数据提取器(100)从接收信号中提取数据并输出提取的数据。 信号延迟部分(200)在预定时间内延迟从数据提取器(100)输出的信号,并输出延迟的信号。 干扰消除选择部分(300)从接收到的原始信号中提取中置信号信道,以选择和输出第一干扰消除对象的用户。 第一级干扰消除块(400)从数据提取器(100)接收接收到的信号的数据,以对第一干扰消除对象的选定用户和输出再现信号执行第一并行干扰消除。 并且第二级干扰消除块(500)接收在预定时间内延迟并从信号延迟部分(200)输出的接收信号的数据,以使用从第一级干扰输出的第一再现信号执行第二并联干扰消除 消除块(400)。
    • 9. 发明公开
    • 중복 검파 방식을 이용한 이동 통신 시스템의 간섭 제거방법
    • 通过联合检测的移动通信系统的干扰消除方法
    • KR1020040055299A
    • 2004-06-26
    • KR1020020081941
    • 2002-12-20
    • 한국전자통신연구원
    • 홍대식조대순조성철이유로권동승김성경오종의경문건
    • H04B7/005
    • PURPOSE: An interference removing method of a mobile communication system through joint detection is provided to reduce the amount of calculation in detecting a joint part by completely removing an interference component of a non-considered symbol. CONSTITUTION: Symbols that are not affected by interference can be detected by repeating receiving data vectors. In this case, a size of a repeated portion is affected by maximum time delay. If an interval between symbols is great, the two symbols do not have correlation. Thus, if the number of symbols exceeds a certain size, it does not much affect performance. It is important to search the number of symbols and a size of symbols to be repeated that may reduce the amount of calculation to its maximum without degradation of performance. Such factors can be easily found out if time delay information of a channel could be known. By using repetition techniques, the amount of calculation in the processing detecting a joint part can be considerably reduced without degradation of performance due to influence of interference of the time delay component.
    • 目的:提供通过联合检测的移动通信系统的干扰消除方法,以通过完全去除未考虑的符号的干扰分量来减少检测关节部分的计算量。 构成:不受干扰影响的符号可以通过重复接收数据向量来检测。 在这种情况下,重复部分的大小受到最大时间延迟的影响。 如果符号之间的间隔很大,则两个符号不具有相关性。 因此,如果符号数超过一定大小,则对性能没有太大的影响。 搜索要重复的符号数量和符号大小很重要,可以将计算量减少到最大值,而不会降低性能。 如果通道的时间延迟信息可以被知道,则可以容易地发现这些因素。 通过使用重复技术,可以显着地减少检测关节部分的处理中的计算量,而不会由于延迟分量的干扰的影响而导致性能下降。