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    • 12. 发明公开
    • 직교 주파수 분할 다중 접속 시스템의 상향 링크에서주파수 오프셋의 추정 장치 및 방법
    • 正交频分多址接入系统上行频率估计的装置及方法
    • KR1020080001998A
    • 2008-01-04
    • KR1020060060523
    • 2006-06-30
    • 삼성전자주식회사
    • 황종윤조동균황금찬김광순
    • H04L27/26H04B7/26
    • H04L27/2657H04L27/2653H04L27/2665H04L27/2678
    • An apparatus and a method for estimating a frequency offset in an uplink of an OFDMA(Orthogonal Frequency Division Multiple Access) system are provided to estimate a frequency offset efficiently without inducing power consumption and complexity of a base station receiver. An apparatus for estimating a frequency offset in an uplink of an OFDMA system includes an observation window setting unit(701), a fourier transform unit(702), a phase compensation unit(703), a subcarrier selector(704), and a frequency offset estimation unit(706). The observation window setting unit outputs at least two time domain signals having a predetermined time delay difference from a received signal through first and second observation windows having a different time delay. The fourier transform unit transforms at least two time domain signals to at least two frequency domain signals. The phase compensation unit compensates a phase change by a time delay difference between the first observation window and the second observation window. The subcarrier selector selects subcarriers of a specific user for estimating the frequency offset in at least two frequency domain signals of which a phase change is compensated. The frequency offset estimation unit calculates a phase difference of subcarriers having the same subcarrier index from the selected subcarriers. The frequency offset estimation unit estimates a frequency offset for a received signal of a specific user based on the phase difference.
    • 提供了一种用于估计OFDMA(正交频分多址)系统的上行链路中的频率偏移的装置和方法,以有效地估计频率偏移,而不会引起基站接收机的功耗和复杂性。 用于估计OFDMA系统的上行链路中的频率偏移的装置包括观察窗口设置单元(701),傅立叶变换单元(702),相位补偿单元(703),子载波选择器(704)和频率 偏移估计单元(706)。 观察窗设置单元通过具有不同时间延迟的第一观察窗口和第二观察窗口,从接收信号输出具有预定时间延迟差异的至少两个时域信号。 傅立叶变换单元将至少两个时域信号转换为至少两个频域信号。 相位补偿单元通过第一观察窗与第二观察窗之间的时间延迟差补偿相位变化。 子载波选择器选择特定用户的子载波来估计在相位改变被补偿的至少两个频域信号中的频率偏移。 频率偏移估计单元从所选择的子载波计算具有相同子载波索引的子载波的相位差。 频率偏移估计单元基于相位差估计特定用户的接收信号的频率偏移。
    • 19. 发明公开
    • 통신 시스템에서 신호 송신 장치 및 방법
    • 用于在通信系统中发送/接收信号的装置和方法
    • KR1020080041054A
    • 2008-05-09
    • KR1020060109145
    • 2006-11-06
    • 삼성전자주식회사연세대학교 산학협력단
    • 김동호김영수류탁기황금찬김광순박효열
    • H04L1/18H03M13/11H03M13/00
    • H03M13/1102H03M13/033H03M13/6393
    • An apparatus and a method for transmitting and receiving a signal in a communication system are provided to transmit/receive the signal by a puncturing method and maximize recovery accuracy by reducing the number of variable nodes of a recovery tree which are not punctured. A method for transceiving a signal in a communication system includes the steps of: generating an LDPC(Low Density Parity Check) codeword by coding an information vector by an LDPC coding method; selecting check nodes and variable nodes of the LPDC codeword by using a cost function(513,515); puncturing the variable nodes when the variable nodes are not connected to the reserved check nodes(525); and puncturing the variable nodes through the variable node selection until the variable nodes to be punctured do not exist when all the punctured nodes are recovered through a stopping set check(521,523,525).
    • 提供一种用于在通信系统中发送和接收信号的装置和方法,以通过打孔方法发送/接收信号,并通过减少未被穿孔的恢复树的可变节点的数量来最大化恢复精度。 一种用于在通信系统中收发信号的方法包括以下步骤:通过LDPC编码方法对信息向量进行编码,生成LDPC(低密度奇偶校验)码字; 通过使用成本函数选择LPDC码字的校验节点和变量节点(513,515); 当变量节点未连接到保留的校验节点时,对可变节点进行穿孔(525); 并且通过变量节点选择对可变节点进行穿孔,直到当通过停止集合检查(521,523,525)恢复所有穿孔节点时,不存在待删截的变量节点。
    • 20. 发明公开
    • 직교 주파수 분할 다중화 시스템에서 주파수 오프셋 추정 방법 및 장치
    • 用于改进频率偏移估计的方法和装置对正交频分多路复用系统中的多通道渐近通道的鲁棒性
    • KR1020070111673A
    • 2007-11-22
    • KR1020060044758
    • 2006-05-18
    • 삼성전자주식회사
    • 황종윤조동균황금찬김광순
    • H04L27/26H04L27/38H04J11/00
    • H04L27/2676H04L27/2657H04L27/2695
    • A method and an apparatus for estimating frequency offset in OFDM systems are provided to carry out the frequency estimation accurately in a frequency selective fading channel. After a received signal comprising a cyclic prefix and an OFDM(Orthogonal Frequency Division Multiplexing) symbol is input, the signal is delayed by a length of the OFDM symbol, and then is subjected to conjugate conversion. The received signal is multiplied by the delayed signals and conjugate-converted signals so as to generate a correlation values between the received signals. The correlation values input for a preset observation interval are stored in a shift resistor(503). The correlation values output from the shift resistor are accumulated. A phase of the accumulated value is measured, and then the measured phase values are accumulated. The accumulated values are divided into the preset observation interval to output a frequency offset.
    • 提供了一种用于估计OFDM系统中频率偏移的方法和装置,用于在频率选择性衰落信道中精确地执行频率估计。 在输入包括循环前缀和OFDM(正交频分复用)符号的接收信号之后,将信号延迟OFDM符号的长度,然后进行共轭转换。 接收到的信号乘以延迟信号和共轭转换信号,以产生接收信号之间的相关值。 输入预设观察间隔的相关值存储在移位电阻(503)中。 从移位电阻输出的相关值被累积。 测量累加值的相位,然后累积测量相位值。 将累积值分为预设的观察间隔以输出频率偏移。