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公开(公告)号：US06445752B1
公开(公告)日：2002-09-03
申请号：US09248904
申请日：1999-02-12
IPC分类号： H04L2714
CPC分类号： H04L27/066 , H04L1/0045 , H04L2027/003 , H04L2027/0057 , H04L2027/0067
摘要： A phase tracker receives a signal component xn and forms a phase- and gain-corrected signal zn. In particular, the phase tracker performs a Hilbert transform of xn to produce a quadrature phase component yn to form the constellation defined by (xn, yn). Consequently, phase rotation and gain adjustment are combined into a linear transform of the constellation defined by (xn, yn). The linear transform zn=&agr;xn+&bgr;yn employs two coefficients &agr; and &bgr;. The coefficients &agr; and &bgr; of the linear transform are derived so as to provide an optimal solution according to minimum mean square error. Approximations to the coefficients &agr; and &bgr; of the linear transform may be iteratively determined with a stochastic gradient method. Advantages of employing the phase- and gain-corrected signal zn as an I-phase detection result of a demodulator include 1) the phase rotation and gain adjustment are combined into one operation, and 2) the a sine/cosine lookup table is not employed. Including both phase rotation and a gain adjustment may provide for better performance of the demodulator. In addition, these advantages may result in reduced circuit complexity and reduced added error.
摘要翻译： 相位跟踪器接收信号分量xn并且形成相位和增益校正信号zn。 特别地，相位跟踪器执行xn的希尔伯特变换以产生正交相位分量yn，以形成由（xn，yn）定义的星座。 因此，相位旋转和增益调整被组合成由（xn，yn）定义的星座的线性变换。 线性变换zn = alphaxn + betayn采用两个系数α和β。 导出线性变换的系数α和β，以便根据最小均方误差提供最优解。 可以用随机梯度法迭代确定线性变换的系数α和β的近似值。 采用相位和增益校正信号zn作为解调器的I相检测结果的优点包括1）将相位旋转和增益调整组合成一个操作，2）不使用正弦/余弦查找表 。 包括相位旋转和增益调整都可以提供更好的解调器性能。 此外，这些优点可能导致电路复杂度降低和附加误差降低。
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2.发明授权公开(公告)号：US09215019B2
公开(公告)日：2015-12-15
申请号：US13564840
申请日：2012-08-02
申请人： Hong Jiang , Liangkai Yu
发明人： Hong Jiang , Liangkai Yu
摘要： In a method for cancelling interference caused by a terrestrial transmitter at a satellite receiver in a hybrid satellite-terrestrial network, a satellite receiver generates an interference cancellation signal based on a reference terrestrial signal from the terrestrial transmitter and a received over-the-air (OTA) signal. The satellite receiver then cancels the interference caused by the terrestrial transmitter by combining the interference cancellation signal with the received OTA signal. The interference cancellation signal is a modified version of the reference terrestrial signal.
摘要翻译： 在用于消除混合卫星地面网络中的卫星接收机处的地面发射机造成的干扰的方法中，卫星接收机基于来自地面发射机的参考地面信号和接收到的空中无线电（ OTA）信号。 然后，卫星接收机通过将干扰消除信号与接收到的OTA信号组合来消除由地面发射机引起的干扰。 干扰消除信号是参考地面信号的修改版本。
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3.发明申请公开(公告)号：US20090325532A1
公开(公告)日：2009-12-31
申请号：US12213997
申请日：2008-06-27
申请人： Michael Nekhamkin , Liangkai Yu
发明人： Michael Nekhamkin , Liangkai Yu
IPC分类号： H04B1/10
CPC分类号： H04B1/30 , H04L25/061 , H04L2027/0016 , H04L2027/0024
摘要： Methods and systems for recovering a DC component in a zero-IF radio receiver are disclosed that involve receiving a frequency modulated radio frequency broadcast signal, down-converting the frequency modulated radio frequency broadcast signal directly to an original baseband frequency signal, wherein the original baseband frequency signal includes an original DC component, filtering the original baseband signal to obtain a filtered baseband signal, wherein the original DC component is removed, analyzing modulus values of the filtered baseband signal to determine an estimated quantity for the original DC component, and adding the estimated quantity for the original DC component to the filtered baseband signal to compensate for removal of the original DC component such that a reconstructed baseband signal is obtained.
摘要翻译： 公开了用于恢复零中频无线电接收机中的DC分量的方法和系统，其涉及接收频率调制的射频广播信号，将频率调制的射频广播信号直接下变频到原始基带频率信号，其中原始基带 频率信号包括原始DC分量，对原始基带信号进行滤波以获得滤波后的基带信号，其中去除原始DC分量，分析滤波后的基带信号的模数值，以确定原始DC分量的估计量，并将 将原始DC分量的估计量用于滤波后的基带信号，以补偿原始DC分量的去除，从而获得重构的基带信号。
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4.发明申请公开(公告)号：US20130208655A1
公开(公告)日：2013-08-15
申请号：US13564840
申请日：2012-08-02
申请人： Hong Jiang , Liangkai Yu
发明人： Hong Jiang , Liangkai Yu
IPC分类号： H04B7/185
摘要： In a method for cancelling interference caused by a terrestrial transmitter at a satellite receiver in a hybrid satellite-terrestrial network, a satellite receiver generates an interference cancellation signal based on a reference terrestrial signal from the terrestrial transmitter and a received over-the-air (OTA) signal. The satellite receiver then cancels the interference caused by the terrestrial transmitter by combining the interference cancellation signal with the received OTA signal. The interference cancellation signal is a modified version of the reference terrestrial signal.
摘要翻译： 在用于消除混合卫星地面网络中的卫星接收机处的地面发射机造成的干扰的方法中，卫星接收机基于来自地面发射机的参考地面信号和接收到的空中无线电（ OTA）信号。 然后，卫星接收机通过将干扰消除信号与接收到的OTA信号组合来消除由地面发射机引起的干扰。 干扰消除信号是参考地面信号的修改版本。
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5.发明授权公开(公告)号：US08019311B2
公开(公告)日：2011-09-13
申请号：US12213997
申请日：2008-06-27
申请人： Michael Nekhamkin , Liangkai Yu
发明人： Michael Nekhamkin , Liangkai Yu
CPC分类号： H04B1/30 , H04L25/061 , H04L2027/0016 , H04L2027/0024
摘要： Methods and systems for recovering a DC component in a zero-IF radio receiver are disclosed that involve receiving a frequency modulated radio frequency broadcast signal, down-converting the frequency modulated radio frequency broadcast signal directly to an original baseband frequency signal, wherein the original baseband frequency signal includes an original DC component, filtering the original baseband signal to obtain a filtered baseband signal, wherein the original DC component is removed, analyzing modulus values of the filtered baseband signal to determine an estimated quantity for the original DC component, and adding the estimated quantity for the original DC component to the filtered baseband signal to compensate for removal of the original DC component such that a reconstructed baseband signal is obtained.
摘要翻译： 公开了用于恢复零中频无线电接收机中的DC分量的方法和系统，其涉及接收频率调制的射频广播信号，将频率调制的射频广播信号直接下变频到原始基带频率信号，其中原始基带 频率信号包括原始DC分量，对原始基带信号进行滤波以获得滤波后的基带信号，其中去除原始DC分量，分析滤波后的基带信号的模数值，以确定原始DC分量的估计量，并将 将原始DC分量的估计量用于滤波后的基带信号，以补偿原始DC分量的去除，从而获得重构的基带信号。
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