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    • 3. 发明授权
    • Preamble design for frequency offset estimation and channel equalization in burst OFDM transmission system
    • 用于突发OFDM传输系统中的频偏估计和信道均衡的前导码设计
    • US07554902B2
    • 2009-06-30
    • US10420693
    • 2003-04-23
    • Ki-yun KimHo KimHyung-jin Choi
    • Ki-yun KimHo KimHyung-jin Choi
    • H04J11/00
    • H04L27/2607H04L27/2657H04L27/2675
    • Provided is a transmission data frame in an orthogonal frequency division multiplexing (OFDM) burst mode transmission, and more particularly, a frequency offset estimating method and a channel equalizing method using a transmission data frame. In the transmission data frame used in the orthogonal frequency division multiplexing burst mode transmission, a length of a guard interval in a preamble area for frequency offset estimation and channel estimation varies depending on a channel environment not being limited in consideration of a size of a data symbol, and only data of ending part of the guard interval in the preamble is used to estimate frequency offset in consideration of intersymbol interference. In the frequency offset estimating method, desired frequency estimation efficiency can be satisfied with the small number of samples. Also, when channel equalization is performed, two symbols are averaged in a time area to reduce the accuracy of channel estimation due to Gaussian random noise. In a frequency area, by referring to weight placed on an adjacent subcarrier, a channel equalization coefficient is obtained to efficiently reduce Gaussian random noise.
    • 提供了正交频分复用(OFDM)突发模式传输中的发送数据帧,更具体地,使用使用发送数据帧的频率偏移估计方法和信道均衡方法。 在正交频分复用突发模式传输中使用的发送数据帧中,用于频偏估计和信道估计的前同步码区域中的保护间隔的长度根据不受数据大小限制的信道环境而变化 符号,并且仅使用前导码中的保护间隔的结束部分的数据来估计考虑码间干扰的频率偏移。 在频率偏移估计方法中,可以利用少量样本来满足期望的频率估计效率。 此外,当执行信道均衡时,在时间区域中平均两个符号以降低由于高斯随机噪声导致的信道估计的准确度。 在频率区域中,通过参考相邻子载波上的权重,获得信道均衡系数以有效地降低高斯随机噪声。
    • 4. 发明申请
    • Transmitter and receiver in DBLAST system
    • DBLAST系统中的发射机和接收机
    • US20060164970A1
    • 2006-07-27
    • US11063125
    • 2005-02-22
    • Kyu-Ha LeeSung-Hun JungDae-Sik HongEun-Seok KoJae-Hee Cho
    • Kyu-Ha LeeSung-Hun JungDae-Sik HongEun-Seok KoJae-Hee Cho
    • H04J11/00H04J3/02
    • H04B7/0891H04B7/06H04L27/2608
    • A transmitter of a Diagonal Bell Laboratories Layered Space-Time (DBLAST) system includes an interleaver for performing interleaving for all sub-streams in a stream of a transmission signal, thereby generating an interleaved signal, a symbol repeater for generating a reverse-arranged signal rearranged in a reverse order to the interleaved signal, and a DBLAST transmit unit for transmitting the interleaved signal and the reverse-arranged signal through multiple transmit antennas. A receiver of a DBLAST system includes a DBLAST receive unit for receiving signals through multiple transmit antennas, a repeating symbol combiner for generating a combined signal; a deinterleaver for generating a deinterleaved signal; and a decoder for decoding the deinterleaved signal.
    • 对角贝尔实验室分层时空(DBLAST)系统的发射机包括交织器,用于对传输信号的流中的所有子流执行交织,从而产生交织的信号,用于产生反向排列的信号的符号中继器 以与交错信号相反的顺序重新排列,以及DBLAST发送单元,用于通过多个发送天线发送交织信号和反向排列的信号。 DBLAST系统的接收机包括用于通过多个发射天线接收信号的DBLAST接收单元,用于产生组合信号的重复符号组合器; 用于产生解交织信号的解交织器; 以及用于对解交错信号进行解码的解码器。
    • 5. 发明申请
    • Apparatus for measuring absolute rotation angle and method thereof
    • 绝对旋转角测量装置及其方法
    • US20020087288A1
    • 2002-07-04
    • US09935742
    • 2001-08-23
    • SAMSUNG THALES CO., LTD.
    • Yong Tea Kim
    • G01C009/00
    • G01D5/2073
    • Disclosed is an apparatus for measuring an absolute rotation angle and a method thereof. In particular, the apparatus is available for a measurement and servo system in which high precision is required in rotation drive and absolute rotation angle measurement. The apparatus comprises a rotation mechanism having a driver rotating unit connected to a resolver, a driver fixing unit coupled to the driver rotating unit and a sensor for detecting a rotating state of the driver rotating unit; an actuator unit for driving the rotation mechanism in response to a rotation control; a resolver interface for converting a rotation detection signal from the resolver to a digital resolve data; and a controller for providing the rotation control signal to the actuator unit, receives the digital resolver data and the rotation detection signal to set the initial rotation reference position of the rotation mechanism, and compensates a rotation angle when the digital resolver data changes abruptly in respect to the initial rotation reference position to calculate an absolute rotation angle.
    • 公开了一种用于测量绝对旋转角度的装置及其方法。 特别地,该装置可用于在旋转驱动和绝对旋转角度测量中需要高精度的测量和伺服系统。 该装置包括旋转机构,其具有连接到旋转变压器的驱动器旋转单元,连接到驱动器旋转单元的驱动器固定单元和用于检测驾驶员旋转单元的旋转状态的传感器; 用于响应旋转控制来驱动旋转机构的致动器单元; 解析器接口,用于将来自旋转变压器的旋转检测信号转换成数字解析数据; 以及用于向所述致动器单元提供所述旋转控制信号的控制器,接收所述数字解析器数据和所述旋转检测信号,以设定所述旋转机构的初始旋转基准位置,并且当所述数字解析器数据突然变化时补偿旋转角度 到初始旋转参考位置以计算绝对旋转角度。
    • 9. 发明申请
    • Tunable filter circuit including a phase locked loop
    • 可调谐滤波电路,包括一个锁相环
    • US20030231053A1
    • 2003-12-18
    • US10282371
    • 2002-10-29
    • SAMSUNG THALES CO., LTD.
    • Jae-Hwan Kim
    • H03B001/00
    • H03L7/0805H03J3/20H03L7/099H03L7/18
    • A tunable filter circuit using a phase locked loop for filtering signals by varying a center frequency of the tunable filter circuit. The tunable filter circuit includes a phase locked loop and a resonance circuit. The phase locked loop includes: a voltage controlled oscillator having a resonance circuit, of which center frequency is varied in correspondence to an inputted control voltage level, for oscillating a frequency signal corresponding to the inputted control voltage level; a PPL controller for generating an error voltage signal corresponding to a phase difference by comparing a reference frequency signal to a signal phase that is oscillated by the voltage controlled oscillator, in correspondence to frequency control data for variably setting a resonance frequency of the voltage controlled oscillator; and a loop filter for loop filtering the error voltage signal and for outputting the loop filtered signal to the voltage controlled oscillator as the control voltage. The resonance circuit has the identical oscillation characteristic with the resonance circuit of the voltage controlled oscillator, and filters and then outputs signals from a wanted frequency band appropriate for a center frequency that varies in accordance with the control voltage level to an inputted signal.
    • 一种使用锁相环的可调滤波器电路,用于通过改变可调谐滤波器电路的中心频率对信号进行滤波。 可调谐滤波电路包括锁相环和谐振电路。 锁相环包括:具有谐振电路的压控振荡器,其中心频率对应于输入的控制电压电平而变化,用于振荡与输入的控制电压电平对应的频率信号; PPL控制器,用于通过将参考频率信号与由压控振荡器振荡的信号相位相比较来产生对应于相位差的误差电压信号,该频率控制数据用于可变地设置压控振荡器的谐振频率 ; 以及环路滤波器,用于对误差电压信号进行环路滤波,并将环路滤波信号输出到压控振荡器作为控制电压。 谐振电路与压控振荡器的谐振电路具有相同的振荡特性,并对来自适合于根据控制电压电平变化的中心频率的有用频带的信号输出到输入信号。
    • 10. 发明授权
    • Method and apparatus for compensating for residual frequency offset in an OFDM system
    • 用于补偿OFDM系统中的残余频率偏移的方法和装置
    • US07376194B2
    • 2008-05-20
    • US10838123
    • 2004-05-03
    • Ki-Yun Kim
    • Ki-Yun Kim
    • H04K1/10
    • H04L27/2676H04L27/266H04L2027/0057
    • Disclosed is a method for compensating for a residual frequency offset in an orthogonal frequency division multiplexing system comprising the steps of: a) performing a fast fourier transform for an input signal to convert the input signal into a serial signal; b) detecting signal power of the serial signal to control the passthrough a signal greater than a predetermined critical value; c) selecting each section of a quadrant for each passed signal; d) estimating a phase error in each section of the quadrant for one orthogonal frequency division multiplexing symbol with respect to the selected section of the quadrant; and e) frequency-oscillating a signal based on the estimated phase error, generating the input signal by multiplying an oscillated signal by a band-passed signal, and then returning to step a).
    • 公开了一种用于补偿正交频分复用系统中的残余频率偏移的方法,包括以下步骤:a)对输入信号执行快速傅立叶变换以将输入信号转换为串行信号; b)检测串行信号的信号功率,以控制通过大于预定临界值的信号; c)为每个传递的信号选择象限的每个部分; d)针对所述象限的所选择的部分估计一个正交频分复用符号的所述象限的每个部分中的相位误差; 以及e)基于估计的相位误差对信号进行频率振荡,通过将振荡信号乘以带通信号产生输入信号,然后返回到步骤a)。