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公开(公告)号：US12074623B2
公开(公告)日：2024-08-27
申请号：US18144342
申请日：2023-05-08
Applicant: Rambus Inc.
Inventor： Masum Hossain , Nhat Nguyen , Yikui Jen Dong , Arash Zargaran-Yazd , Wendemagegnehu Beyene
CPC classification number: H04B1/123 , H04B1/12 , H04L25/0264 , H04L25/03057 , H04L25/03076 , H04L25/03133 , H04L25/4917 , H04L27/00 , H04L27/01 , H04L27/06
Abstract: Decision feedback equalization (DFE) is used to help reduce inter-symbol interference (ISI) from a data signal received via a band-limited (or otherwise non-ideal) channel. A first PAM-4 DFE architecture has low latency from the output of the samplers to the application of the first DFE tap feedback to the input signal. This is accomplished by not decoding the sampler outputs in order to generate the feedback signal for the first DFE tap. Rather, weighted versions of the raw sampler outputs are applied directly to the input signal without further analog or digital processing. Additional PAM-4 DFE architectures use the current symbol in addition to previous symbol(s) to determine the DFE feedback signal. Another architecture transmits PAM-4 signaling using non-uniform pre-emphasis. The non-uniform pre-emphasis allows a speculative DFE receiver to resolve the transmitted PAM-4 signals with fewer comparators/samplers.
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公开(公告)号：US20190007037A1
公开(公告)日：2019-01-03
申请号：US15635728
申请日：2017-06-28
Applicant: HEWLETT PACKARD ENTERPRISE DEVELOPMENT LP
Inventor： Dacheng Zhou , Daniel Alan Berkram , Ryan Barnhill , Christopher Allan Poirier , Christopher Wilson
CPC classification number: H03K5/24 , G01D5/204 , H03F3/45479 , H03K19/20 , H03M9/00 , H04L25/0272 , H04L25/03076
Abstract: A comparator includes a resolver controlled by a resolver clock signal and a differential amplifier controlled by a sampling clock signal. The resolver clock signal and the sampling clock signal are such that amplification at the differential amplifier during the reset phase of the resolver clock signal and the reset phase of the sampling clock signal begins during the resolving phase of the resolver.
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公开(公告)号：US09923739B2
公开(公告)日：2018-03-20
申请号：US15375970
申请日：2016-12-12
Applicant: Collision Communications, Inc.
Inventor： Sayak Bose , Brandon Hombs , Joseph Farkas
IPC: H04L25/03 , H04B7/0452
CPC classification number: H04L25/03292 , H04B7/0452 , H04L25/0204 , H04L25/03076 , H04L25/03267 , H04L25/03331 , H04L2025/03636
Abstract: An improved receiver design implements a practical method for modeling users in SIC turbo loop multiuser detection architectures, wherein in each loop unsubtracted estimation errors from previous loops are used to appropriately scale the error covariance matrix for each user, thereby accurately representing the remaining residual interference in the data stream for each desired user. The effect of estimation errors in previous interference cancellation operations is thereby minimized, and symbol estimations in successive turbo loops are improved, for example during multiuser MMSE, multiuser MMSE with interference rejection combining (MMSE-IRC), sample matrix inversion (SMI), or any of their adaptive variants (least mean-square, recursive least square, Kalman filter etc.). The estimated residual symbol energy can be computed per symbol, and then applied to entire data streams, to groups of symbols, or to each symbol separately.
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4.发明申请
公开(公告)号：US20140064352A1
公开(公告)日：2014-03-06
申请号：US13604812
申请日：2012-09-06
Applicant: Lizhi Zhong
Inventor： Lizhi Zhong
IPC: H04L27/01
CPC classification number: H04L25/03057 , H04L25/03038 , H04L25/03076
Abstract: An apparatus including a receiver having a feed forward equalizer (FFE) coupled to a communication channel. The receiver may be configured to adjust the FFE using information based on an estimate of one or more characteristics of the communication channel.
Abstract translation: 一种装置，包括具有耦合到通信信道的前馈均衡器（FFE）的接收机。 接收机可以被配置为基于通信信道的一个或多个特性的估计来使用信息来调整FFE。
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5.发明授权Systems, circuits and methods for filtering signals to compensate for channel effects 有权用于滤波信号以补偿信道效应的系统，电路和方法
公开(公告)号：US08537949B1
公开(公告)日：2013-09-17
申请号：US12828153
申请日：2010-06-30
Applicant: Halil Cirit , Stefanos Sidiropoulos
Inventor： Halil Cirit , Stefanos Sidiropoulos
IPC: H04L7/00
CPC classification number: H04B10/2507 , H04L25/03063 , H04L25/0307 , H04L25/03076
Abstract: Transmitter waveform dispersion penalty (“TWDP”) is decreased in a transmitter. A binary data signal is received for transmission over a channel that exhibits TWDP. The data signal is shifted less than a full clock cycle to generate at least one post cursor signal. The post cursor signal is subtracted from the data signal to generate a transmitter output data signal for transmission over the channel. In addition to decreasing TWDP, data dependent jitter is also reduced for data transmission across a channel that exhibits a multi-pole transmission characteristic. A main data signal and at least one cursor signal, which is shifted at least a portion of a clock period from the main data signal, is generated. The cursor signal is filtered to filter out effects based on the second pole of the multi-pole transmission characteristic. The main data signal is subtracted from the filtered cursor signal to generate the transmitter output data signal. Circuits and methods for transmitting serial data streams over a channel compliant with KR and SPI specifications are also disclosed.
Abstract translation: 发射机中的发射机波形色散损失（“TWDP”）减小。 接收二进制数据信号以通过展现TWDP的信道进行传输。 数据信号被移动小于一整个时钟周期以产生至少一个后光标信号。 从数据信号中减去后光标信号，以产生用于在信道上传输的发射机输出数据信号。 除了降低TWDP之外，数据相关的抖动也减少了跨越显示多极传输特性的通道的数据传输。 产生主数据信号和至少一个光标信号，其被从主数据信号的至少一部分时钟周期移位。 对光标信号进行滤波以滤除基于多极传输特性的第二极点的效果。 从经滤波的光标信号中减去主数据信号，以产生发射机输出数据信号。 还公开了通过符合KR和SPI规范的信道发送串行数据流的电路和方法。
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公开(公告)号：US08477894B2
公开(公告)日：2013-07-02
申请号：US13415283
申请日：2012-03-08
Applicant: James A. Wurzbach , Steven E. Shields , David G. Manzi
Inventor： James A. Wurzbach , Steven E. Shields , David G. Manzi
CPC classification number: H04L25/0224 , H04L25/03057 , H04L25/03076 , H04L27/2647
Abstract: In accordance with the present invention, a method of processing a signal is described that includes receiving a signal having an encoded digital packet, wherein the digital packet includes packet data and a packet frame, wherein the packet frame includes a common digital signal that is common to each one of a plurality of digital packets. The method further includes sampling a signal associated with the received signal to provide a sampled signal. The method further includes performing a channel characterization by contrasting a signal representative of the sampled signal with a signal representative of the common digital signal. A corresponding system is also described.
Abstract translation: 根据本发明，描述了处理信号的方法，其包括接收具有编码数字分组的信号，其中数字分组包括分组数据和分组帧，其中分组帧包括公共数字信号 到多个数字分组中的每一个。 该方法还包括对与接收信号相关联的信号进行采样以提供采样信号。 该方法还包括通过将表示采样信号的信号与表示公共数字信号的信号进行对比来执行信道表征。 还描述了相应的系统。
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7.发明授权
公开(公告)号：US08259784B2
公开(公告)日：2012-09-04
申请号：US12732217
申请日：2010-03-26
Applicant: Chia-Liang Lin
Inventor： Chia-Liang Lin
IPC: H03H7/30
CPC classification number: H04L25/03076
Abstract: An apparatus is disclosed, the apparatus comprising: a broad-band continuous-time adjustable weight summing cell for summing an input signal and a feedback signal into an intermediate signal in accordance with a weight factor for the feedback signal; a broad-band continuous-time delay cell for receiving the intermediate signal and outputting the feedback signal; a broad-band variable gain amplifier for amplifying the feedback signal into an output signal in accordance with a gain factor; and an adaptation circuit for adjusting the weight and the gain factor in accordance with the output signal and a timing defined by a clock signal so as to minimize an interference form a previous data to a present data embedded in the output signal.
Abstract translation: 公开了一种装置，该装置包括：宽带连续时间可调整权重求和单元，用于根据反馈信号的权重因子将输入信号和反馈信号相加到中间信号中; 用于接收中间信号并输出反馈信号的宽带连续时间延迟单元; 宽带可变增益放大器，用于根据增益因子将反馈信号放大成输出信号; 以及适应电路，用于根据输出信号和由时钟信号定义的定时来调整权重和增益因子，以便将来自嵌入在输出信号中的当前数据的先前数据的干扰最小化。
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公开(公告)号：US20110075720A1
公开(公告)日：2011-03-31
申请号：US12570760
申请日：2009-09-30
Applicant: Javier Elenes
Inventor： Javier Elenes
CPC classification number: H04B1/1081 , H04L25/03076
Abstract: A radio receiver has a multipath equalizer that includes a filter and a coefficient estimator. The filter provides a reconstructed signal by applying a transfer function including a reflection coefficient and a delay coefficient to a multipath radio signal. The coefficient estimator adapts the reflection coefficient and the delay coefficient in response to a deviation in magnitude of the reconstructed signal from a normalized value. In one form, the coefficient estimator adapts at least one of the reflection coefficient and the delay coefficient by estimating a partial derivative using a predetermined number of terms. In another form, the coefficient estimator acquires an initial value of the delay coefficient by determining a global minimum as a lowest one of a plurality of local minimums, each determined using a plurality of values of the delay coefficient, and selecting the initial value of the delay coefficient as its value at the global minimum.
Abstract translation: 无线电接收机具有包括滤波器和系数估计器的多径均衡器。 滤波器通过对多径无线电信号应用包括反射系数和延迟系数的传递函数来提供重构信号。 系数估计器响应于重构信号的幅度与标准化值的偏差来适应反射系数和延迟系数。 在一种形式中，系数估计器通过使用预定数量的项估计偏导数来适应反射系数和延迟系数中的至少一个。 在另一种形式中，系数估计器通过将全局最小值确定为多个局部最小值中的最小值来获取延迟系数的初始值，每个局部最小值使用多个延迟系数值来确定，并且选择该初始值 延迟系数作为其全球最小值。
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公开(公告)号：US20080181288A1
公开(公告)日：2008-07-31
申请号：US11627392
申请日：2007-01-26
Applicant: James A. Wurzbach , Steven E. Shields , David G. Manzi
Inventor： James A. Wurzbach , Steven E. Shields , David G. Manzi
IPC: H04B17/00
CPC classification number: H04L25/0224 , H04L25/03057 , H04L25/03076 , H04L27/2647
Abstract: In accordance with the present invention, a method of processing a signal is described that includes receiving a signal having an encoded digital packet, wherein the digital packet includes packet data and a packet frame, wherein the packet frame includes a common digital signal that is common to each one of a plurality of digital packets. The method further includes sampling a signal associated with the received signal to provide a sampled signal. The method further includes performing a channel characterization by contrasting a signal representative of the sampled signal with a signal representative of the common digital signal. A corresponding system is also described.
Abstract translation: 根据本发明，描述了处理信号的方法，其包括接收具有编码数字分组的信号，其中数字分组包括分组数据和分组帧，其中分组帧包括公共数字信号 到多个数字分组中的每一个。 该方法还包括对与接收信号相关联的信号进行采样以提供采样信号。 该方法还包括通过将表示采样信号的信号与表示公共数字信号的信号进行对比来执行信道表征。 还描述了相应的系统。
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10.发明申请
公开(公告)号：US20080159377A1
公开(公告)日：2008-07-03
申请号：US12043517
申请日：2008-03-06
Applicant: Steve A. Allpress , Quinn Li
Inventor： Steve A. Allpress , Quinn Li
CPC classification number: H04L25/03261 , H04L25/03057 , H04L25/03076 , H04L25/03146 , H04L25/03171 , H04L2025/03401 , H04L2025/0349 , H04L2025/0356 , H04L2025/03796
Abstract: An apparatus and method for implementing an equalizer which (1) combines the benefits of a decision feedback equalizer (DFE) with a maximum-a-posterori (MAP) equalizer (or a maximum likelihood sequence estimator, MLSE) (2) performs equalization in a time-forward or time-reversed manner based on the channel being minimum-phase or maximum-phase to provide an equalization device with significantly lower complexity than a full-state MAP device, but which still provides improved performance over a conventional DFE. The equalizer architecture includes two DFE-like structures, followed by a MAP equalizer. The first DFE forms tentative symbol decisions. The second DFE is used thereafter to truncate the channel response to a desired memory of L1 symbols, which is less than the total delay spread of L symbols of the channel. The MAP equalizer operates over a channel with memory of L1 symbols (where L1
Abstract translation: （1）将判决反馈均衡器（DFE）与最大后缀（MAP）均衡器（或最大似然序列估计器，MLSE）（2）的优点相结合的均衡器的装置和方法（2）执行均衡 基于信道是最小相位或最大相位的时间前向或时间反转方式来提供具有比全状态MAP设备显着更低的复杂度的均衡设备，但仍然提供比常规DFE更好的性能。 均衡器架构包括两个类似DFE的结构，其次是MAP均衡器。 第一个DFE形成暂定的符号决定。 此后使用第二DFE来截断对于L1 L1符号的期望存储器的信道响应，其小于信道的L个符号的总延迟扩展。 MAP均衡器在具有L 1 1符号（其中L 1> L =）的存储器的信道上操作，因此均衡器的总体复杂度显着降低。
