公开(公告)号：US08811464B1

公开(公告)日：2014-08-19

申请号：US12978718

申请日：2010-12-27

申请人： Jagadish Venkataraman ,  Jamal Riani ,  Pui Shan Wong

发明人： Jagadish Venkataraman ,  Jamal Riani ,  Pui Shan Wong

IPC分类号： H03K5/159

CPC分类号： H04L25/03019 ,  H04L2025/03471 ,  H04L2025/03611

摘要： Apparatuses, methods, and other embodiments associated with adaptively determining equalizer setting for 10GBASE-KR transmitter are described. According to one embodiment, an apparatus for tuning an equalizer configured to undo the effects of a channel connecting a transmitter communicating to a receiver via a backplane includes a tuning logic configured to adaptively determine equalizer settings for the equalizer. The tuning logic includes a symmetric search logic configured to determine a desired boost setting for the equalizer, and an asymmetric search logic configured to determine a desired phase response for the equalizer.

摘要翻译： 描述了与自适应地确定10GBASE-KR发射机的均衡器设置相关联的装置，方法和其他实施例。 根据一个实施例，一种用于调谐均衡器的装置，被配置为撤销连接经由背板与接收器通信的发射机的信道的影响，该调谐逻辑被配置为自适应地确定均衡器的均衡器设置。 调谐逻辑包括被配置为确定均衡器的期望升压设置的对称搜索逻辑，以及被配置为确定所述均衡器的期望相位响应的非对称搜索逻辑。

公开(公告)号：US08644372B1

公开(公告)日：2014-02-04

申请号：US13459049

申请日：2012-04-27

申请人： Jamal Riani ,  Jagadish Venkataraman ,  Kok-Wui Cheong

发明人： Jamal Riani ,  Jagadish Venkataraman ,  Kok-Wui Cheong

IPC分类号： H03H7/30 ,  H03H7/40 ,  H03K5/159

CPC分类号： H04L25/03318 ,  H04L25/03267

摘要： In a method for detecting symbols in a signal received via a communication channel, the signal including a plurality of signal points, each signal point in the plurality of signal points is processed using a decision feedback equalizer (DFE) to produce a DFE decision. Reliability of the DFE decision is assessed to determine whether the DFE decision is at least one of i) reliable or ii) not reliable. When it is determined that the DFE decision is not reliable, a block of signal points of the plurality of signal points is processed using a Viterbi Detector (VD) to generate a block of VD decisions. The block of VD decisions is selected to be used in place of a block of DFE decisions.

摘要翻译： 在用于检测通过通信信道接收的信号中的符号的方法中，包括多个信号点的信号，使用判决反馈均衡器（DFE）处理多个信号点中的每个信号点以产生DFE判定。 评估DFE决定的可靠性以确定DFE决定是否至少是i）可靠或ii）不可靠。 当确定DFE判定不可靠时，使用维特比检测器（VD）处理多个信号点的信号点块，以产生一个VD判定块。 选择VD决策块代替DFE决定块。

公开(公告)号：US08509125B1

公开(公告)日：2013-08-13

申请号：US12903406

申请日：2010-10-13

申请人： Jagadish Venkataraman

发明人： Jagadish Venkataraman

IPC分类号： H04B3/23 ,  H04B3/20

CPC分类号： H04L5/1461 ,  H04B3/20 ,  H04B3/23

摘要： Systems, methods, and other embodiments associated with echo cancellation are described. According to one embodiment, a method uses two signals from a transmitter as input to a look-up table to generate a non-linear echo cancellation signal. The non-linear echo cancellation signal is applied to a receiving path to reduce non-linear echo distortion on the receiving path based at least in part on the current signal and the previous signal.

摘要翻译： 描述与回波抵消相关联的系统，方法和其他实施例。 根据一个实施例，一种方法使用来自发射机的两个信号作为查找表的输入，以产生非线性回波消除信号。 非线性回波消除信号被施加到接收路径，以至少部分地基于当前信号和先前信号来减小接收路径上的非线性回波失真。

公开(公告)号：US08743940B1

公开(公告)日：2014-06-03

申请号：US12951278

申请日：2010-11-22

申请人： Jagadish Venkataraman

发明人： Jagadish Venkataraman

IPC分类号： H03H7/30

CPC分类号： H04L25/03 ,  H04L25/03019 ,  H04L25/03038 ,  H04L25/03057 ,  H04L25/03343 ,  H04L2025/03808

摘要： Systems, methods, and other embodiments associated with adaptively determining settings of a transmit equalizer are described. According to one embodiment, a signal is received from a transmitter and a signal contribution of the transmit equalizer is removed from the signal to produce a residual signal. Revised tap coefficients are computed based, at least in part, on the residual signal. Revised tap coefficient settings, that are based, at least in part, on the revised tap coefficients, are provided to the transmit equalizer.

摘要翻译： 描述了与自适应地确定发射均衡器的设置相关联的系统，方法和其他实施例。 根据一个实施例，从发射机接收信号，并从信号中去除发射均衡器的信号贡献以产生残余信号。 至少部分地基于剩余信号来计算修正抽头系数。 修改的抽头系数设置，至少部分地基于经修订的抽头系数，被提供给发送均衡器。

公开(公告)号：US08737542B1

公开(公告)日：2014-05-27

申请号：US12986866

申请日：2011-01-07

申请人： Jagadish Venkataraman

发明人： Jagadish Venkataraman

IPC分类号： H03D1/00 ,  H04L27/06

CPC分类号： H04L1/0054 ,  H04L1/0047 ,  H04L7/0331 ,  H04L25/03057 ,  H04L25/03229 ,  H04L25/03318 ,  H04L25/067

摘要： A method and apparatus for receiving data in high-speed applications wherein an analog-to-digital converter (ADC) samples a received signal and a data decoder implemented with a tree search algorithm detects the bits of the sampled data for timing recovery. In some embodiments, a Viterbi detector is implemented to provide accurate bit detection for data output while tree search detected data is used to determine the optimal sampling phase for the ADC. In some embodiments, after the phase acquisition stage of timing recovery has completed, the tree search decoder may decrease the rate of data detection to maintain phase tracking.

摘要翻译： 一种用于在高速应用中接收数据的方法和装置，其中模数转换器（ADC）对接收到的信号进行采样，并且使用树搜索算法实现的数据解码器检测采样数据的位以进行定时恢复。 在一些实施例中，实施维特比检测器以提供用于数据输出的精确位检测，而树搜索检测数据用于确定ADC的最佳采样相位。 在一些实施例中，在定时恢复的相位获取阶段完成之后，树搜索解码器可以降低数据检测的速率以维持相位跟踪。

公开(公告)号：US08265583B1

公开(公告)日：2012-09-11

申请号：US12211642

申请日：2008-09-16

申请人： Jagadish Venkataraman

发明人： Jagadish Venkataraman

IPC分类号： H04B1/10 ,  H04B17/00

CPC分类号： H04B17/21

摘要： A method of compensating for arbitrary nonlinearities associated with a received signal includes receiving a plurality of samples of the signal having at least one in-band region and at least one out-of-band region, generating a plurality of compensated signal values based on the plurality of samples and a plurality of respective compensation values, applying a transform function to the plurality of compensated signal values to generate a frequency-domain representation of the plurality of compensated signal values, and updating at least one of the plurality of compensation values using the generated frequency-domain representation of the signal to reduce energy associated with the at least one out-of-band region of the signal.

摘要翻译： 补偿与接收信号相关联的任意非线性的方法包括：接收具有至少一个带内区域和至少一个带外区域的信号的多个样本，基于该信号产生多个补偿信号值 多个采样和多个相应的补偿值，将变换函数应用于所述多个补偿信号值以产生所述多个补偿信号值的频域表示，并且使用所述多个补偿值来更新所述多个补偿值中的至少一个 产生信号的频域表示以减少与信号的至少一个带外区域相关联的能量。