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    • 11. 发明授权
    • Residual frequency, phase, timing offset and signal amplitude variation tracking apparatus and methods for OFDM systems
    • 用于OFDM系统的残余频率,相位,定时偏移和信号幅度变化跟踪装置和方法
    • US07916797B2
    • 2011-03-29
    • US11286996
    • 2005-11-22
    • Heejung YuTaehyun JeonMyung-Soon KimEun-Young ChoiSok-Kyu LeeDeuk-Su Lyu
    • Heejung YuTaehyun JeonMyung-Soon KimEun-Young ChoiSok-Kyu LeeDeuk-Su Lyu
    • H04K1/10H04L27/00H04J11/00
    • H04L27/266H04L27/2659H04L27/2662H04L27/2675H04L27/2682H04L27/2685H04L27/2695
    • An error tracking apparatus and method for tracking a residual frequency error, a phase error, a timing error, and a signal amplitude variation to enhance a phase error tracking performance and a tracking speed in an orthogonal frequency division multiplexing (OFDM) system is provided. The error tracking apparatus and method include: a frequency error corrector for correcting a frequency at a time domain by adding a tracking carrier error estimating value to an initial carrier frequency error estimating value; a signal amplitude tracking corrector for controlling a signal amplitude by multiplying an input signal converted by a fast Fourier transform (FFT) by an output value corresponding to a calculated power of a receive pilot signal; a channel corrector for outputting a channel correcting signal by multiplying the receive pilot signal by a complex conjugate of a frequency channel response of the receive pilot signal; a carrier frequency error estimator for estimating a carrier frequency error parameter using the channel-corrected pilot and providing the tracking carrier frequency error estimating value; a time offset estimator for estimating a time offset parameter using the channel-corrected pilot; and a carrier phase error estimator for estimating a carrier phase error parameter using the channel-corrected pilot.
    • 提供了一种用于跟踪残余频率误差,相位误差,定时误差和信号幅度变化的误差跟踪装置和方法,以增强正交频分复用(OFDM)系统中的相位误差跟踪性能和跟踪速度。 误差跟踪装置和方法包括:频率误差校正器,用于通过将初始载波频率误差估计值加上跟踪载波误差估计值来校正时域的频率; 信号幅度跟踪校正器,用于通过将通过快速傅里叶变换(FFT)转换的输入信号乘以与所计算的接收导频信号的功率相对应的输出值来控制信号幅度; 信道校正器,用于通过将接收导频信号乘以接收导频信号的频率信道响应的复共轭来输出信道校正信号; 载波频率误差估计器,用于使用所述信道校正的导频来估计载波频率误差参数,并提供所述跟踪载波频率误差估计值; 时间偏移估计器,用于使用所述通道校正的导频来估计时间偏移参数; 以及载波相位误差估计器,用于使用信道校正的导频来估计载波相位误差参数。
    • 15. 发明申请
    • Residual frequency, phase, timing offset and signal amplitude variation tracking apparatus and methods for OFDM systems
    • 用于OFDM系统的残余频率,相位,定时偏移和信号幅度变化跟踪装置和方法
    • US20060133527A1
    • 2006-06-22
    • US11286996
    • 2005-11-22
    • Heejung YuTaehyun JeonMyung-Soon KimEun-Young ChoiSok-Kyu LeeDeuk-Su Lyu
    • Heejung YuTaehyun JeonMyung-Soon KimEun-Young ChoiSok-Kyu LeeDeuk-Su Lyu
    • H04K1/10H03D1/04
    • H04L27/266H04L27/2659H04L27/2662H04L27/2675H04L27/2682H04L27/2685H04L27/2695
    • An error tracking apparatus and method for tracking a residual frequency error, a phase error, a timing error, and a signal amplitude variation to enhance a phase error tracking performance and a tracking speed in an orthogonal frequency division multiplexing (OFDM) system is provided. The error tracking apparatus and method include: a frequency error corrector for correcting a frequency at a time domain by adding a tracking carrier error estimating value to an initial carrier frequency error estimating value; a signal amplitude tracking corrector for controlling a signal amplitude by multiplying an input signal converted by a fast Fourier transform (FFT) by an output value corresponding to a calculated power of a receive pilot signal; a channel corrector for outputting a channel correcting signal by multiplying the receive pilot signal by a complex conjugate of a frequency channel response of the receive pilot signal; a carrier frequency error estimator for estimating a carrier frequency error parameter using the channel-corrected pilot and providing the tracking carrier frequency error estimating value; a time offset estimator for estimating a time offset parameter using the channel-corrected pilot; and a carrier phase error estimator for estimating a carrier phase error parameter using the channel-corrected pilot.
    • 提供了一种用于跟踪残余频率误差,相位误差,定时误差和信号幅度变化的误差跟踪装置和方法,以增强正交频分复用(OFDM)系统中的相位误差跟踪性能和跟踪速度。 误差跟踪装置和方法包括:频率误差校正器,用于通过将初始载波频率误差估计值加上跟踪载波误差估计值来校正时域的频率; 信号幅度跟踪校正器,用于通过将通过快速傅里叶变换(FFT)转换的输入信号乘以与所计算的接收导频信号的功率相对应的输出值来控制信号幅度; 信道校正器,用于通过将接收导频信号乘以接收导频信号的频率信道响应的复共轭来输出信道校正信号; 载波频率误差估计器,用于使用所述信道校正的导频来估计载波频率误差参数,并提供所述跟踪载波频率误差估计值; 时间偏移估计器,用于使用所述通道校正的导频来估计时间偏移参数; 以及载波相位误差估计器,用于使用信道校正的导频来估计载波相位误差参数。
    • 20. 发明授权
    • Phase modulation apparatus and method
    • 相位调制装置及方法
    • US08358178B2
    • 2013-01-22
    • US12833281
    • 2010-07-09
    • Myung-Soon Kim
    • Myung-Soon Kim
    • H03C3/00H04B1/00
    • H03C3/0925H03C3/0941H03C3/095H03C3/0966H03C3/0975
    • A phase modulation apparatus and method are provided. The phase modulation apparatus includes a storage to store phase modulation setting values corresponding to various communication modes; a phase modulation setting value selector to select, when a communication mode is changed, phase modulation setting values corresponding to the changed communication mode among the phase modulation setting values stored in the storage; and a phase modulator to modulate a phase of a transmission signal using the phase modulation setting values selected by the phase modulation setting value selector. According to the phase modulation apparatus, since a frequency characteristic of a loop filter in a PLL circuit is changed depending on a transmission mode of a communication apparatus and phase modulation is performed using appropriate bandwidths according to various transmission modes, it is possible to prevent noise characteristics from degrading when a PLL bandwidth changes.
    • 提供了相位调制装置和方法。 相位调制装置包括:存储器,用于存储与各种通信模式对应的相位调制设定值; 相位调制设定值选择器,当通信模式改变时,选择存储在所述存储器中的所述相位调制设定值中与所述改变的通信模式对应的相位调制设定值; 以及使用由相位调制设定值选择器选择的相位调制设定值来调制发送信号的相位的相位调制器。 根据相位调制装置,由于PLL电路中的环路滤波器的频率特性根据通信装置的发送模式而变化,并且根据各种发送模式使用适当的带宽进行相位调制,因此可以防止噪声 当PLL带宽变化时,降级特性。