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    Receiver training with cycle slip detection and correction
    41.
    发明授权
    Receiver training with cycle slip detection and correction 有权
    接收机训练与周期滑移检测和校正

    公开(公告)号：US08605847B2

    公开(公告)日：2013-12-10

    申请号：US13043908

    申请日：2011-03-09

    申请人： Mohammad Mobin ,  Mark Trafford ,  Ye Liu ,  Vladimir Sindalovsky ,  Amaresh Malipatil

    发明人： Mohammad Mobin ,  Mark Trafford ,  Ye Liu ,  Vladimir Sindalovsky ,  Amaresh Malipatil

    IPC分类号： H04L7/00

    CPC分类号： H04L7/033 ,  H04L7/0083 ,  H04L2025/037

    摘要： In described embodiments, a transceiver includes a clock and data recovery module (CDR) with an eye monitor and a cycle slip monitor. The cycle slip detector monitors a CDR lock condition, which might be through detection of slips in sampling and/or transition timing detection. The cycle slip detector provides a check point to sense system divergence, allowing for a mechanism to recover CDR lock. In addition, when the CDR is out-of-lock, the various parameters that are adaptively set (e.g., equalizer parameters) might be invalid during system divergence. Consequently, these parameters might be declared invalid by the system and not used.

    摘要翻译： 在所描述的实施例中，收发器包括具有眼睛监视器和周期滑移监视器的时钟和数据恢复模块（CDR）。 循环滑移检测器监测CDR锁定状态，其可以通过在采样和/或转换定时检测中检测到滑移。 循环滑移检测器提供检查点以感测系统发散，允许恢复CDR锁的机制。 另外，当CDR超出锁定时，自适应设置的各种参数（例如，均衡器参数）在系统发散期间可能是无效的。 因此，这些参数可能被系统声明为无效，未被使用。

    DECISION FEEDFORWARD EQUALIZATION
    43.
    发明申请
    DECISION FEEDFORWARD EQUALIZATION 有权
    决策权衡均等化

    公开(公告)号：US20130243066A1

    公开(公告)日：2013-09-19

    申请号：US13419009

    申请日：2012-03-13

    申请人： Chaitanya Palusa ,  Tomasz Prokop ,  Adam B. Healey ,  Ye Liu

    发明人： Chaitanya Palusa ,  Tomasz Prokop ,  Adam B. Healey ,  Ye Liu

    IPC分类号： H04L27/01

    CPC分类号： H04L25/03057 ,  H04L27/02

    摘要： In described embodiments, a Decision Feed Forward Equalizer (DFFE) comprises a hybrid architecture combining features of a Feed Forward Equalizer (FFE) and a Decision Feedback Equalizer (DFE). An exemplary DFFE offers relatively improved noise and crosstalk immunity than an FFE implementation alone, and relatively lower burst error propagation than a DFE implementation alone. The exemplary DFFE is a relatively simple implementation due few or no critical feedback paths, as compared to a DFE implementation alone. The exemplary DFFE allows for a parallel implementation of its DFE elements without an exponential increase in the hardware for higher numbers of taps. The exemplary DFFE allows for cascading, allowing for progressive improvement in BER, at relatively low implementation cost as a solution to achieve multi-tap DFE performance.

    摘要翻译： 在所描述的实施例中，决策前馈均衡器（DFFE）包括组合前馈均衡器（FFE）和判决反馈均衡器（DFE）的特征的混合架构。 一个示例性的DFFE提供了比单独的FFE实现相对改进的噪声和串扰抗扰度，并且相比于单独的DFE实现相对较低的突发错误传播。 与仅DFE实现相比，示例性DFFE是相对简单的实现，因为很少或没有关键的反馈路径。 示例性DFFE允许其DFE元件的并行实现，而对于较高数量的抽头，硬件的指数增加。 示例性DFFE允许级联，允许在相对低的实施成本下逐渐改进BER，作为实现多抽头DFE性能的解决方案。

    TX back channel adaptation algorithm
    47.
    发明授权
    TX back channel adaptation algorithm 有权
    TX反向信道自适应算法

    公开(公告)号：US08472513B2

    公开(公告)日：2013-06-25

    申请号：US12353860

    申请日：2009-01-14

    申请人： Amaresh Malipatil ,  Lizhi Zhong ,  Wenyi Jin ,  Ye Liu

    发明人： Amaresh Malipatil ,  Lizhi Zhong ,  Wenyi Jin ,  Ye Liu

    IPC分类号： H04B3/46

    CPC分类号： H04L25/03057 ,  H04L25/03343

    摘要： Disclosed is a method and system that adapts coefficients of taps of a Finite Impulse Response (FIR) filter to increase elimination of Inter-Symbol Interference (ISI) introduced into a digital communications signal due to distortion characteristics caused by a real-world communications channel. In the communications system there is a Finite Impulse Response (FIR) filter. The FIR filter has at least one pre and/or post cursor tap that removes pre and/or post cursor ISI from the signal, respectively. The pre/post cursor taps each have pre/post cursor coefficients, respectively, that adjusts the effect of the pre/post cursor portion of the FIR filter. The FIR filtered signal is transmitted over the channel which distorts the signal due to the changing and/or static distortion characteristics of the channel. The channel distorted signal is received at a receiver that may pass the channel distorted signal through a quantifier/decision system (e.g., a slicer) as the quantifier input signal to quantify the quantifier input signal to one of multiple digital values. The channel distorted signal may be further adjusted by summing the channel distorted signal with the output of a Decision Feedback Equalizer (DFE) filter to create a DFE corrected signal which then becomes the quantifier input signal. An error signal is determined by finding the difference between the scaled quantifier decision and the quantifier input signal. The pre/post cursor coefficient values that adjust the effects of the pre/post cursor taps of the FIR filter are updated as a function of the error signal and at least two quantifier decision values, and update coefficient values, may be sent over a communications back-channel to the FIR filter.

    摘要翻译： 公开了一种适应有限脉冲响应（FIR）滤波器的抽头的系数的方法和系统，以增加由于真实世界通信信道引起的失真特性引入到数字通信信号中的符号间干扰（ISI）的消除。 在通信系统中有一个有限脉冲响应（FIR）滤波器。 FIR滤波器具有至少一个前和/或后光标分接头，分别从信号中去除前和/或后光标ISI。 前/后光标分接头各自具有调整FIR滤波器的前/后光标部分的效果的前/后光标系数。 FIR滤波信号通过信道传输，由于信道的变化和/或静态失真特性而使信号发生变形。 在接收机处接收信道失真信号，该接收机可以通过量化器/判定系统（例如，限幅器）将信道失真信号作为量化器输入信号来传送，以将量化器输入信号量化为多个数字值之一。 可以通过将信道失真信号与判决反馈均衡器（DFE）滤波器的输出相加来进一步调整信道失真信号，以产生DFE校正信号，然后该信号变为量化器输入信号。 通过找出缩放的量化器判定与量化器输入信号之间的差异来确定误差信号。 调整FIR滤波器的前/后光标抽头的效果的前/后光标系数值作为误差信号的函数被更新，并且可以通过通信发送至少两个量化器判定值和更新系数值 返回通道到FIR滤波器。

    CONDITIONAL ADAPTATION OF LINEAR FILTERS IN A SYSTEM HAVING NONLINEARITY
    48.
    发明申请
    CONDITIONAL ADAPTATION OF LINEAR FILTERS IN A SYSTEM HAVING NONLINEARITY 有权
    线性滤波器在非线性系统中的条件适应

    公开(公告)号：US20130148712A1

    公开(公告)日：2013-06-13

    申请号：US13315831

    申请日：2011-12-09

    申请人： Amaresh Malipatil ,  Pervez M. Aziz ,  Mohammad S. Mobin ,  Ye Liu

    发明人： Amaresh Malipatil ,  Pervez M. Aziz ,  Mohammad S. Mobin ,  Ye Liu

    IPC分类号： H04L27/01

    CPC分类号： H04L25/03057 ,  H04L7/033 ,  H04L7/0331 ,  H04L25/0292 ,  H04L25/0307 ,  H04L25/03159 ,  H04L25/03885 ,  H04L2025/03636 ,  H04L2025/037

    摘要： Described embodiments adjust configurable parameters of at least one filter of a communication system. The method includes conditioning, by an analog front end (AFE) of a receiver in the communication system, an input signal applied to the receiver. Sampled values of the conditioned input signal are generated and digitized. An error detection module generates an error signal based on digitized values of the input signal and a target value. A decision feedback equalizer generates an adjustment signal based on the digitized values of the input signal and values of the error signal. A summer subtracts the adjustment signal from the conditioned input signal, generating an adjusted input signal. An adaptation module determines a conditional adaptation signal based on a comparison of sampled values of the adjusted input signal and values of the error signal. The adaptation module adjusts a transfer function of at least one filter based on the conditional adaptation signal.

    摘要翻译： 描述的实施例调整通信系统的至少一个滤波器的可配置参数。 该方法包括通过通信系统中的接收机的模拟前端（AFE）调整施加到接收机的输入信号。 生成调节输入信号的采样值并进行数字化。 误差检测模块基于输入信号的数字化值和目标值产生误差信号。 判决反馈均衡器基于输入信号的数字化值和误差信号的值生成调整信号。 夏季从调节的输入信号中减去调整信号，产生经调整的输入信号。 适应模块基于经调整的输入信号的采样值和误差信号的值的比较来确定条件适配信号。 适应模块基于条件适应信号来调整至少一个滤波器的传递函数。

    Real-time eye monitor for statistical filter parameter calibration
    50.
    发明授权
    Real-time eye monitor for statistical filter parameter calibration 有权
    统计滤波器参数校准的实时眼监护仪

    公开(公告)号：US08300684B2

    公开(公告)日：2012-10-30

    申请号：US12493435

    申请日：2009-06-29

    申请人： Mohammad Mobin ,  Ye Liu ,  Kenneth Paist ,  Mark Trafford

    发明人： Mohammad Mobin ,  Ye Liu ,  Kenneth Paist ,  Mark Trafford

    IPC分类号： H03H7/40

    CPC分类号： H04L27/01 ,  H04L25/03057 ,  H04L25/03082 ,  H04L25/03343 ,  H04L2025/03356 ,  H04L2025/03484 ,  H04L2025/03598 ,  H04L2025/03802

    摘要： In described embodiments, filter parameters for a filter applied to a signal in, for example, a Serializer/De-serializer (SerDes) receiver and/or transmitter are generated based on real-time monitoring of a data eye. The real-time eye monitor monitors data eye characteristics of the signal present in a data path, the data path applying the filter to the signal. The eye monitor generates eye statistics from the monitored data eye characteristics and an adaptive controller generates a set of parameters for the filter of the data path for statistical calibration of the data eye, wherein the eye monitor continuously monitors the data eye and the adaptive controller continuously generates the set of parameters based on the eye statistics.

    摘要翻译： 在所描述的实施例中，基于对数据眼的实时监视来生成应用于例如串行器/解串器（SerDes）接收器和/或发射器中的信号的滤波器的滤波器参数。 实时监视器监视数据路径中存在的信号的数据眼睛特征，数据路径将滤波器应用于信号。 眼睛监护器根据监测的数据眼睛特征产生眼睛统计，并且自适应控制器生成用于数据路径的滤波器的一组参数以用于数据眼睛的统计校准，其中眼睛监视器连续监视数据眼睛和自适应控制器 根据眼睛统计信息生成一组参数。