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1. 发明申请

US20080107168A1 Advanced Digital Receiver 有权
标题翻译：高级数字接收机
公开(公告)号：US20080107168A1
公开(公告)日：2008-05-08
申请号：US11547816
申请日：2005-04-08
申请人： Jingsong Xia , Shidong Chen , Richard W. Citta , Gopalan Krishnamurthy , Scott M. Lopresto , David A. Willming , Xiaojun Yang , Jilian Zhu
发明人： Jingsong Xia , Shidong Chen , Richard W. Citta , Gopalan Krishnamurthy , Scott M. Lopresto , David A. Willming , Xiaojun Yang , Jilian Zhu
IPC分类号： H04L27/01
CPC分类号： H04L25/03057 , H04L1/006 , H04L7/0062 , H04L7/042 , H04L25/0212
摘要： A digital receiver for processing a signal received from a channel includes a digital demodulator and an equalizer coupled to the digital demodulator. The equalizer includes a feedforward filter and a decision feedback equalizer (DFE), wherein the feedforward filter includes a plurality of feedforward filter taps. Coefficients are associated with the plurality of feedforward filter taps and the values of all of the coefficients associated with the plurality of feedforward filter taps are dynamically determined.
摘要翻译：用于处理从信道接收的信号的数字接收机包括耦合到数字解调器的数字解调器和均衡器。均衡器包括前馈滤波器和判决反馈均衡器（DFE），其中前馈滤波器包括多个前馈滤波器抽头。系数与多个前馈滤波器抽头相关联，并且动态地确定与多个前馈滤波器抽头相关联的所有系数的值。

2. 发明授权

US07995648B2 Advanced digital receiver 有权
标题翻译：高级数字接收机
公开(公告)号：US07995648B2
公开(公告)日：2011-08-09
申请号：US11547816
申请日：2005-04-08
申请人： Jingsong Xia , Shidong Chen , Richard W. Citta , Gopalan Krishnamurthy , Scott M. Lopresto , David A. Willming , Xiaojun Yang , Jilian Zhu
发明人： Jingsong Xia , Shidong Chen , Richard W. Citta , Gopalan Krishnamurthy , Scott M. Lopresto , David A. Willming , Xiaojun Yang , Jilian Zhu
IPC分类号： H04B1/10 , H04L1/00
CPC分类号： H04L25/03057 , H04L1/006 , H04L7/0062 , H04L7/042 , H04L25/0212
摘要： A digital receiver for processing a signal received from a channel includes a digital demodulator and an equalizer coupled to the digital demodulator. The equalizer includes a feedforward filter and a decision feedback equalizer (DFE), wherein the feedforward filter includes a plurality of feedforward filter taps. Coefficients are associated with the plurality of feedforward filter taps and the values of all of the coefficients associated with the plurality of feedforward filter taps are dynamically determined.
摘要翻译：用于处理从信道接收的信号的数字接收机包括耦合到数字解调器的数字解调器和均衡器。均衡器包括前馈滤波器和判决反馈均衡器（DFE），其中前馈滤波器包括多个前馈滤波器抽头。系数与多个前馈滤波器抽头相关联，并且动态地确定与多个前馈滤波器抽头相关联的所有系数的值。

3. 发明授权

US07599433B2 Apparatus for and method of controlling a feedforward filter of an equalizer 有权
标题翻译：用于控制均衡器的前馈滤波器的装置和方法
公开(公告)号：US07599433B2
公开(公告)日：2009-10-06
申请号：US11578132
申请日：2005-04-08
申请人： Jilian Zhu , Scott M. Lopresto , David A. Willming , Shidong Chen , Gopalan Krishnamurthy
发明人： Jilian Zhu , Scott M. Lopresto , David A. Willming , Shidong Chen , Gopalan Krishnamurthy
IPC分类号： H03H7/30 , H03K5/159
CPC分类号： H04L25/03057 , H04L7/0062 , H04L25/0212 , H04L2025/0342 , H04L2025/0349
摘要： A method of controlling a feedforward filter of an equalizer includes the steps of generating a complex representation of an output of the feedforward filter and generating a representation of a decision from an output of the equalizer. The complex representation and the decision representation are correlated to obtain a phase error estimate. A phase correction value is generated based on the phase error estimate and used to adjust the phase of the output of the feedforward filter.
摘要翻译：控制均衡器的前馈滤波器的方法包括以下步骤：产生前馈滤波器的输出的复数表示，并从均衡器的输出生成决定的表示。复合表示和决策表示相关，以获得相位误差估计。基于相位误差估计产生相位校正值，用于调整前馈滤波器输出的相位。

4. 发明申请

US20070201544A1 Apparatus For And Method Of Controlling A Feedforward Filter Of An Equalizer 有权
标题翻译：控制均衡器前馈滤波器的装置和方法
公开(公告)号：US20070201544A1
公开(公告)日：2007-08-30
申请号：US11578132
申请日：2005-04-08
申请人： Jilian Zhu , Scott Lopresto , David Willming , Shidong Chen , Gopalan Krishnamurthy
发明人： Jilian Zhu , Scott Lopresto , David Willming , Shidong Chen , Gopalan Krishnamurthy
IPC分类号： H03H7/30 , H04B1/10
CPC分类号： H04L25/03057 , H04L7/0062 , H04L25/0212 , H04L2025/0342 , H04L2025/0349
摘要： A method of controlling a feedforward filter of an equalizer includes the steps of generating a complex representation of an output of the feedforward filter and generating a representation of a decision from an output of the equalizer. The complex representation and the decision representation are correlated to obtain a phase error estimate. A phase correction value is generated based on the phase error estimate and used to adjust the phase of the output of the feedforward filter.
摘要翻译：控制均衡器的前馈滤波器的方法包括以下步骤：产生前馈滤波器的输出的复数表示，并从均衡器的输出生成决定的表示。复合表示和决策表示相关，以获得相位误差估计。基于相位误差估计产生相位校正值，用于调整前馈滤波器输出的相位。

5. 发明授权

US07653126B2 Apparatus for and method of controlling the operation of an equalizer 有权
标题翻译：用于控制均衡器操作的装置和方法
公开(公告)号：US07653126B2
公开(公告)日：2010-01-26
申请号：US11547817
申请日：2005-04-08
申请人： Xiaojun Yang , Gopalan Krishnamurthy , Jingsong Xia
发明人： Xiaojun Yang , Gopalan Krishnamurthy , Jingsong Xia
IPC分类号： H03K5/159 , H03H7/30 , H03H7/40
CPC分类号： H04L25/03057 , H04L7/0062 , H04L25/0212 , H04L2025/0342 , H04L2025/0349
摘要： A method of controlling the operation of an equalizer (210, 216), wherein the equalizer is adapted to receive a transmitted signal (76, 78) comprising at least one predetermined sequence of symbols, includes the step of developing a set of samples from a received signal. At least one plurality of samples is identified, wherein the at least one plurality of samples corresponds to the at least one predetermined sequence of symbols. The equalizer is then operated in a selected one of three modes. A first mode is selected if the at least one plurality of samples is identified, wherein the first mode includes the step of developing a signal-to-noise ratio (SNR) (100). A second mode is selected if the at least one plurality of samples is identified and the SNR is greater than a first predetermined threshold. A third mode is selected if the at least one plurality of samples is identified and the SNR is greater than a second predetermined threshold.
摘要翻译：一种控制均衡器（210,216）的操作的方法，其中所述均衡器适于接收包括至少一个预定符号序列的发射信号（76,78），包括从一个接收信号。识别至少一个多个样本，其中所述至少一个多个样本对应于所述至少一个预定符号序列。然后，均衡器以三种模式中的一种选择操作。如果识别出至少一个多个样本，则选择第一模式，其中第一模式包括开发信噪比（SNR）（100）的步骤。如果识别出至少一个多个样本并且SNR大于第一预定阈值，则选择第二模式。如果识别出至少一个多个样本并且SNR大于第二预定阈值，则选择第三模式。

6. 发明申请

US20080181292A1 Apparatus for and Method of Controlling the Operation of an Equalizer 有权
标题翻译：控制均衡器运行的装置和方法
公开(公告)号：US20080181292A1
公开(公告)日：2008-07-31
申请号：US11547817
申请日：2005-04-08
申请人： Xiaojun Yang , Gopalan Krishnamurthy , Jingsong Xia
发明人： Xiaojun Yang , Gopalan Krishnamurthy , Jingsong Xia
IPC分类号： H03K5/159 , H03H7/40
CPC分类号： H04L25/03057 , H04L7/0062 , H04L25/0212 , H04L2025/0342 , H04L2025/0349
摘要： A method of controlling the operation of an equalizer (210, 216), wherein the equalizer is adapted to receive a transmitted signal (76, 78) comprising at least one predetermined sequence of symbols, includes the step of developing a set of samples from a received signal. At least one plurality of samples is identified, wherein the at least one plurality of samples corresponds to the at least one predetermined sequence of symbols. The equalizer is then operated in a selected one of three modes. A first mode is selected if the at least one plurality of samples is identified, wherein the first mode includes the step of developing a signal-to-noise ratio (SNR) (100). A second mode is selected if the at least one plurality of samples is identified and the SNR is greater than a first predetermined threshold. A third mode is selected if the at least one plurality of samples is identified and the SNR is greater than a second predetermined threshold.
摘要翻译：一种控制均衡器（210,216）的操作的方法，其中所述均衡器适于接收包括至少一个预定符号序列的发射信号（76,78），包括从一个接收信号。识别至少一个多个样本，其中所述至少一个多个样本对应于所述至少一个预定符号序列。然后，均衡器以三种模式中的一种选择操作。如果识别出至少一个多个样本，则选择第一模式，其中第一模式包括开发信噪比（SNR）（100）的步骤。如果识别出至少一个多个样本并且SNR大于第一预定阈值，则选择第二模式。如果识别出至少一个多个样本并且SNR大于第二预定阈值，则选择第三模式。

7. 发明申请

US20080298518A1 Automatic Gain Control Unit of a Receiver 审中-公开
标题翻译：接收机的自动增益控制单元
公开(公告)号：US20080298518A1
公开(公告)日：2008-12-04
申请号：US11631700
申请日：2005-08-12
申请人： Gopalan Krishnamurthy
发明人： Gopalan Krishnamurthy
IPC分类号： H04L27/08
CPC分类号： H03G3/3068
摘要： An automatic gain control (AGC) circuit that includes an RF amplifier with first and second distinct active gain control regions, wherein a gain of the RF amplifier varies during operation in the active gain control regions
摘要翻译：一种自动增益控制（AGC）电路，其包括具有第一和第二不同有源增益控制区域的RF放大器，其中所述RF放大器的增益在所述有源增益控制区域

8. 发明授权

US6084642A Receiver for adjusting sync levels in VSB systems 失效
标题翻译：用于调整VSB系统中的同步电平的接收器
公开(公告)号：US6084642A
公开(公告)日：2000-07-04
申请号：US726498
申请日：1996-10-07
申请人： Gopalan Krishnamurthy
发明人： Gopalan Krishnamurthy
IPC分类号： H04N5/04 , H04L27/06 , H04N5/16 , H04N5/46 , H04N7/015 , H04N5/44 , H04L23/02 , H04N5/455
CPC分类号： H04N5/16
摘要： A receiver for receiving a cable and terrestrial digital signals of differing VSB modes where the data levels of the various signals have a desired relationship that enables simple data level slicing and error determination. Some of the signals have sync levels that do not conform to the desired relationship and the receiver includes a comb filter for reducing interference when receiving an 8VSB terrestrial signal. The mode of the received signal is determined and a correction factor is applied to the syncs of the signals as needed to reestablish the desired relationship. Operation of the comb filter results in additional levels and a disruption of the desired relationship. For such cases, the comb filtered data levels are modified to make them a subset of the VSB 16 data levels. The modifications are accomplished in feedback paths of the phase tracker after the circuit equalizer and do not affect the data levels passed to the next stage.
摘要翻译：用于接收不同VSB模式的电缆和地面数字信号的接收机，其中各种信号的数据电平具有能够进行简单的数据电平限幅和错误确定的期望的关系。一些信号具有不符合期望关系的同步电平，并且接收机包括用于在接收8VSB地面信号时减少干扰的梳状滤波器。确定接收信号的模式，并且根据需要重新建立期望的关系，将校正因子应用于信号的同步。梳状滤波器的操作导致额外的电平和所需关系的中断。对于这种情况，梳状滤波数据级别被修改为使它们成为VSB 16数据级别的子集。这些修改在电路均衡器之后在相位跟踪器的反馈路径中完成，并且不影响传递到下一级的数据电平。

9. 发明授权

US5627604A Stabilizing the lock up of a bi-phase stable FPLL by augmenting a recovered DC pilot 失效
标题翻译：通过增加恢复的直流导频来稳定双相稳定FPLL的锁定
公开(公告)号：US5627604A
公开(公告)日：1997-05-06
申请号：US354408
申请日：1994-12-12
申请人： Gopalan Krishnamurthy , Victor G. Mycynek , Gary J. Sgrignoli
发明人： Gopalan Krishnamurthy , Victor G. Mycynek , Gary J. Sgrignoli
IPC分类号： H03L7/10 , H04L7/00 , H04L27/06 , H04N5/455
CPC分类号： H04N5/455
摘要： A bi-phase stable FPLL is locked by a DC pilot component in a recovered data signal. The signal is formatted in repetitive data segments including sync characters and a DC pilot. A sign bit, indicative of the polarity of the recovered data, is developed from the sync characters and is used to augment the DC pilot to stabilize the lock up of the FPLL to produce the desired polarity of recovered data.
摘要翻译：在恢复的数据信号中，双相稳定FPLL被DC导频分量锁定。该信号被格式化为重复数据段，包括同步字符和直流导频。表示恢复的数据的极性的符号位是从同步字符开发出来的，并且用于增加DC导频以稳定FPLL的锁定以产生恢复数据的期望极性。

10. 发明授权

US5406587A Error tracking loop 失效
标题翻译：错误跟踪循环
公开(公告)号：US5406587A
公开(公告)日：1995-04-11
申请号：US014889
申请日：1993-02-08
申请人： Thomas P. Horwitz , Ronald B. Lee , Gopalan Krishnamurthy
发明人： Thomas P. Horwitz , Ronald B. Lee , Gopalan Krishnamurthy
IPC分类号： H04N5/455 , H04L1/00 , H04L27/02 , H04L27/06 , H04N7/26 , H04L5/12 , H03D1/00 , H03D1/04 , H03D1/06
CPC分类号： H04L27/02
摘要： A circuit for error correcting a received complex data signal comprises a synchronous detector for recovering an in-phase data component from the received signal and a Hilbert transform filter for estimating the related quadrature component from the recovered in-phase data component, the recovered in-phase data component including a periodically recurring reference signal. A decision feedback loop is periodically operable in response to the reference signal for initially error correcting a selected characteristic of the received signal at a first relatively rapid rate and for subsequently error correcting the selected characteristic at a rate which is less than the first rate and which is dependent upon the estimated S/N ratio of the received signal. In one embodiment, phase errors are corrected at a rate which is also directly related to the value of the estimated quadrature component. In another embodiment, amplitude errors, e.g. gain and offset, are corrected at a rate which is inversely related to the value of the estimated quadrature component.
摘要翻译：用于对接收到的复数据信号进行纠错的电路包括用于从接收信号中恢复同相数据分量的同步检测器和用于从恢复的同相数据分量估计相关正交分量的希尔伯特变换滤波器，包括周期性重复的参考信号。响应于参考信号周期性地执行判决反馈环路，用于以第一相对较快的速率对接收到的信号的选定特性进行初始误差校正，并且随后以小于第一速率的速率对所选择的特性进行误差校正，取决于接收信号的估计S / N比。在一个实施例中，以与估计的正交分量的值直接相关的速率校正相位误差。在另一个实施例中，幅度误差，例如。增益和偏移以与估计的正交分量的值成反比的速率被校正。

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