公开(公告)号：US20180076985A1

公开(公告)日：2018-03-15

申请号：US15265275

申请日：2016-09-14

申请人： Analog Devices, Inc.

发明人： Robert Schell

IPC分类号： H04L25/03 ,  H04L7/027

CPC分类号： H04L25/03057 ,  H04L7/027 ,  H04L25/0262 ,  H04L25/03019 ,  H04L25/0305 ,  H04L25/03159 ,  H04L25/03885 ,  H04L2025/03592 ,  H04L2025/03764

摘要： A system can be configured to control an equalizer circuit to equalize a data signal without requiring prior knowledge of the data signal's data rate. In an example, the system includes an equalizer circuit configured to equalize a data signal based on an equalizer control signal to produce an equalized signal, and a pattern detector configured to detect a specified data pattern in the equalized signal at each of multiple sampling rates. A control circuit can be configured to generate a preferred equalization control signal based on a sampling rate, selected from the multiple sampling rates, at which the pattern detector detects the specified data pattern in the equalized signal.

公开(公告)号：US09258060B2

公开(公告)日：2016-02-09

申请号：US13860616

申请日：2013-04-11

申请人： FUJITSU LIMITED

发明人： Weizhen Yan ,  Bo Liu ,  Lei Li ,  Zhenning Tao ,  Toshiki Tanaka

IPC分类号： H03H7/30 ,  H04B10/2507 ,  H04L25/02 ,  H04L25/03

CPC分类号： H04B10/2507 ,  H04L25/0202 ,  H04L25/03019 ,  H04L2025/03375 ,  H04L2025/03592

摘要： The embodiments of the present invention provide a method and an apparatus for compensating nonlinear distortions in an intensity modulation-direct detection (IM-DD) system; wherein the method comprises: calculating, according to nonlinear coefficients and differences between values of an input signal at different time, nonlinear distortions of the input signal, so as to eliminate the nonlinearity distortions. By applying the method and the apparatus provided by the embodiments of the present invention, nonlinear cost of the IM-DD system can be effectively reduced, thereby improving the system capacity.

摘要翻译： 本发明的实施例提供了一种用于补偿强度调制直接检测（IM-DD）系统中的非线性失真的方法和装置; 其特征在于，所述方法包括：根据非线性系数和不同时间的输入信号的值之差计算输入信号的非线性失真，从而消除非线性失真。 通过应用本发明实施例提供的方法和装置，可以有效地降低IM-DD系统的非线性成本，从而提高系统容量。

公开(公告)号：US20100260250A1

公开(公告)日：2010-10-14

申请号：US12423768

申请日：2009-04-14

申请人： Jay Quirk ,  Matthew Brown

发明人： Jay Quirk ,  Matthew Brown

IPC分类号： H04L27/01

CPC分类号： H04L25/03038 ,  H04L2025/03592

摘要： A system and method are provided for ordering tap setting modifications in a link partner using a plurality of voltage gain taps, while avoiding minimum and maximum limitations. Provided is a link partner (LP) transmitter having a parallel selectable voltage gain taps. The method sends messages from a network-connected local device (LD) directing the LP to generally change the gain setting of either the pre-tap or the post-tap, as follows. The gain setting of selected tap is changed in the desired direction of modification and then the center tap gain settings is maximally increased until a limit signal is received. If a selected tap increment is desired, the center tap is initially decremented more steps than the desired change in the selected tap.

摘要翻译： 提供了一种系统和方法，用于在使用多个电压增益抽头的情况下对链路伙伴中的抽头设置修改进行排序，同时避免最小和最大限制。 提供具有并联可选电压增益抽头的链路伙伴（LP）发射机。 该方法从引导LP的网络连接的本地设备（LD）发送消息，以通常改变预抽头或后抽头的增益设置，如下所述。 所选抽头的增益设置在所需的修改方向上改变，然后中心抽头增益设置最大程度增加，直到接收到限制信号。 如果需要选择抽头增量，则中心抽头最初会比所选抽头中所需的更改步长更多。

公开(公告)号：US20100027611A1

公开(公告)日：2010-02-04

申请号：US12221002

申请日：2008-07-30

申请人： Xingdong Dai ,  Geoffrey Zhang ,  Gary Schiessler ,  Dwight Daugherty ,  Mohammad Mobin ,  Lane Smith ,  Dennis Farley ,  Max Olsen

发明人： Xingdong Dai ,  Geoffrey Zhang ,  Gary Schiessler ,  Dwight Daugherty ,  Mohammad Mobin ,  Lane Smith ,  Dennis Farley ,  Max Olsen

IPC分类号： H04L27/01

CPC分类号： H04L25/03057 ,  H04L2025/03592

摘要： In described embodiments, an adaptive equalizer employed by a receiver in a communication channel, such as Fibre Channel, employs pattern recognition. When a repeating pattern, such as an IDLE or ARBFF pattern, is employed by a standard to, for example, maintain a communication link, an equalizer of the receiver might adaptively set its equalizer parameters based on characteristics of the signal energy of the repeating pattern rather than adaptively set its equalizer parameters based on characteristics of the signal energy of generally random user data carried on the link. Pattern recognition by the receiver allows for maintaining adaptive equalizer parameters at settings preferred for data detection of the typical random data, improving data detection performance of the receiver when the channel transitions from a preset or synchronization repeating pattern to a user random data pattern.

摘要翻译： 在所描述的实施例中，由诸如光纤通道的通信信道中的接收机使用的自适应均衡器使用模式识别。 当诸如空闲或ARBFF模式的重复模式被标准采用以例如维持通信链路时，接收机的均衡器可以基于重复模式的信号能量的特性来自适应地设置其均衡器参数 而不是基于在链路上携带的一般随机用户数据的信号能量的特性自适应地设置其均衡器参数。 接收机的模式识别允许在优选用于典型随机数据的数据检测的设置下维持自适应均衡器参数，当信道从预设或同步重复模式转换到用户随机数据模式时，提高接收机的数据检测性能。

公开(公告)号：US20090060022A1

公开(公告)日：2009-03-05

申请号：US11896184

申请日：2007-08-30

申请人： Kaushal K. Dhar ,  Timothy R. Miller

发明人： Kaushal K. Dhar ,  Timothy R. Miller

IPC分类号： H03K5/159

CPC分类号： H04L25/03057 ,  H04L2025/0349 ,  H04L2025/03592

摘要： An equalizer is provided, comprising: a feedback combiner to combine an input signal and a feedback signal to produce a first signal; a delay line to delay the first signal to produce a second signal; a feed-forward combiner to combine the second signal and a feed-forward signal to produce an output signal; an interim decision circuit to extract a sign bit from the first signal; N feedback scaling elements to generate N scaled feedback signals; M feed-forward scaling elements to generate M scaled feed forward signals; a feedback circuit to pass the N scaled feedback signals through feedback delay elements and feedback summing elements to generate the feedback signal in response to the sign bit; and a feed forward circuit to pass the M scaled feed forward signals through feed-forward delay elements and feed-forward summing elements to generate the feed-forward signal in response to the sign bit.

摘要翻译： 提供均衡器，包括：反馈组合器，用于组合输入信号和反馈信号以产生第一信号; 延迟线，用于延迟所述第一信号以产生第二信号; 前馈组合器，用于组合第二信号和前馈信号以产生输出信号; 临时决定电路，用于从第一信号中提取符号位; N个反馈缩放元件以产生N个缩放的反馈信号; M前馈缩放元素以产生M个缩放的前馈信号; 反馈电路，用于通过反馈延迟元件和反馈求和元件传递N个缩放的反馈信号，以响应于符号位产生反馈信号; 以及前馈电路，用于通过前馈延迟元件和前馈求和元件传递M个定标前馈信号，以响应于符号位产生前馈信号。

公开(公告)号：US20070280383A1

公开(公告)日：2007-12-06

申请号：US11753021

申请日：2007-05-24

申请人： Yasuo Hidaka

发明人： Yasuo Hidaka

IPC分类号： H03D1/04 ,  H04B15/00

CPC分类号： H04L25/063 ,  H04L25/03038 ,  H04L25/03343 ,  H04L2025/03445 ,  H04L2025/03592

摘要： In one embodiment of the present invention, a method for adjusting a signal includes applying compensation for distortion to a signal to generate an output signal. The method also includes, using a clock signal, sampling the output signal to generate a plurality of data values and boundary values, each value comprising either a high value or a low value based on the sampling of the output signal. The method further includes detecting a transition in value between two successive data values and determining a sampled boundary value between the two successive data values. The method also includes, based only on the high or low values of the boundary value and one or more data values before or after the boundary value, adjusting the compensation applied to the signal.

摘要翻译： 在本发明的一个实施例中，一种用于调整信号的方法包括对信号施加失真补偿以产生输出信号。 该方法还包括使用时钟信号对输出信号进行采样以产生多个数据值和边界值，每个值基于输出信号的采样包括高值或低值。 该方法还包括检测两个连续数据值之间的值的转换并确定两个连续数据值之间的采样边界值。 该方法还包括仅基于边界值的高或低值和边界值之前或之后的一个或多个数据值，调整施加到信号的补偿。

公开(公告)号：US20020067782A1

公开(公告)日：2002-06-06

申请号：US09828228

申请日：2001-04-09

发明人： Leif Wilhelmsson

IPC分类号： H04L027/06

CPC分类号： H04L1/18 ,  H04L7/04 ,  H04L27/22 ,  H04L2025/03592 ,  H04L2027/0034 ,  H04L2027/0095

摘要： Methods and apparatuses for iterative parameter estimation are described. The iterative parameter estimation includes performing a first estimation of a first portion of a signal to obtain first parameters of the portion of the signal, wherein the signal contains no known data symbols. The first portion of the signal is demodulated using the first parameters to recover data symbols. The demodulated first portion of the signal is checked to confirm correct demodulation of the first portion of the signal. A second estimation of the first portion of the signal is performed using the recovered data symbols to obtain second parameters of the first portion of the signal. Then, a second portion of the signal is demodulated using the second parameters when the first portion of the signal is correctly demodulated.

摘要翻译： 描述了迭代参数估计的方法和装置。 迭代参数估计包括执行信号的第一部分的第一估计以获得信号部分的第一参数，其中信号不包含已知的数据符号。 使用第一参数来解调信号的第一部分以恢复数据符号。 检查信号的解调的第一部分以确认信号的第一部分的正确解调。 使用恢复的数据符号来执行信号的第一部分的第二估计，以获得信号的第一部分的第二参数。 然后，当信号的第一部分被正确解调时，使用第二参数来解调信号的第二部分。

公开(公告)号：US09197460B1

公开(公告)日：2015-11-24

申请号：US14288838

申请日：2014-05-28

申请人： LSI Corporation

发明人： Vladimir Sindalovsky ,  Lane A. Smith ,  Niall Fitzgerald

IPC分类号： H04L25/03 ,  H04L27/01

CPC分类号： G11C29/022 ,  G11C29/028 ,  H04L25/03057 ,  H04L25/03159 ,  H04L25/03312 ,  H04L25/14 ,  H04L27/01 ,  H04L2025/03592

摘要： Described embodiments provide for, in a receiver circuit employing a data latch, circuitry to adjust trim offset of the data latch to account for latch functional features (e.g., hysteresis and metastability) that may interact with trim of the latch. In accordance with the described embodiments, a trim procedure runs in a pre-selected directions of offset voltage ramp in order to average out the effect of hysteresis and metastability on the final trim offset choice. Different thresholds for accumulated slicer “0” and “1” discrimination of the circuitry to adjust trim offset allows for significant reduction in the number of trim runs, accelerating the slicers' trim process allowing for relatively quick determination of trim offset whenever the slicers are idle.

摘要翻译： 所描述的实施例在采用数据锁存器的接收机电路中提供调整数据锁存器的调整偏移以解决可能与锁存器的微调相互作用的锁存功能特征（例如，滞后和亚稳态）的电路。 根据所描述的实施例，修整过程在偏移电压斜坡的预选方向上运行，以平均化最终修整偏移选择的滞后和亚稳态的影响。 用于调整修整偏移的电路的累积限幅器“0”和“1”分辨率的不同阈值允许修剪运行次数的显着减少，加速切片器的修整处理，允许每当限幅器空闲时相对快速地确定修整偏移 。

公开(公告)号：US08873615B2

公开(公告)日：2014-10-28

申请号：US13622508

申请日：2012-09-19

申请人： Avago Technologies General IP (Singapore) Pte. Ltd.

发明人： David Chak Wang Hui ,  Xiaozhong Wang

IPC分类号： H03H7/40

CPC分类号： H04L25/03044 ,  H04L2025/03356 ,  H04L2025/03592

摘要： A controller and methods for adaptively adjusting a dispersion compensation circuit in a receiver of a communication link are disclosed. The controller receives a signal from an error detector coupled to the receiver. The controller includes a logic engine that provides configuration information to the dispersion compensation circuit. The configuration information defines a digital filter in response to at least one tap constraint and at least one coefficient constraint. In an example embodiment, the logic engine generates a measure of residual inter-symbol interference and a measure of a noise enhancement penalty and iteratively provides a set of adjusted coefficient values that when applied in the digital filter will result in an equalized receiver output signal that minimizes a mathematical combination of the measure of the residual inter-symbol interference and the measure of the noise enhancement penalty. Alternatively, for bandwidth limited channels, the controller provides a predetermined set of coefficient values.

摘要翻译： 公开了一种用于在通信链路的接收机中自适应地调整色散补偿电路的控制器和方法。 控制器从耦合到接收器的误差检测器接收信号。 控制器包括向色散补偿电路提供配置信息的逻辑引擎。 配置信息响应于至少一个抽头约束和至少一个系数约束来定义数字滤波器。 在示例性实施例中，逻辑引擎产生剩余符号间干扰的测量和噪声增强惩罚的度量，并且迭代地提供一组经调整的系数值，当应用于数字滤波器时将产生均衡的接收机输出信号， 最小化余量符号间干扰测量和噪声增强惩罚措施的数学组合。 或者，对于带宽限制信道，控制器提供预定的系数值集合。

公开(公告)号：US20140079110A1

公开(公告)日：2014-03-20

申请号：US13622911

申请日：2012-09-19

申请人： NVIDIA CORPORATION

发明人： Vishwambhar Rathi ,  Carlo Luschi

IPC分类号： H04L27/01

CPC分类号： H04L25/03044 ,  H04L2025/03592

摘要： An equalization parameter analyzer includes a parameter section configured to acquire at least one current parameter for a wireless receiver and an analyzer section configured to compare the at least one current parameter with at least one corresponding previous parameter. Additionally, the equalization parameter analyzer also includes a coefficients section configured to initiate a generation of new equalizer coefficients in the wireless receiver based on a change between the at least one current and corresponding previous parameters that exceeds a predefined threshold. A method of equalization coefficients generation is also provided.

摘要翻译： 均衡参数分析器包括被配置为获取无线接收器的至少一个当前参数的参数部分和被配置为将至少一个当前参数与至少一个对应的先前参数进行比较的分析器部分。 另外，均衡参数分析器还包括系数部分，其被配置为基于超过预定义阈值的至少一个当前和相应的先前参数之间的变化来在无线接收器中发起新的均衡器系数的产生。 还提供了均衡系数产生的方法。