公开(公告)号：US07113556B1

公开(公告)日：2006-09-26

申请号：US09642532

申请日：2000-08-18

申请人： Chris Heegard ,  Stanley K. Ling

发明人： Chris Heegard ,  Stanley K. Ling

IPC分类号： H04B1/10

CPC分类号： H04L25/03057 ,  H04L1/0009 ,  H04L1/0015 ,  H04L2025/03401 ,  H04L2025/03484 ,  H04L2025/03617 ,  H04L2025/03694

摘要： The present invention provides a method and apparatus for selectively updating an adaptive element in a communications receiver based on a determination that the received data is accurate. When inaccurate data is received, the system determines that using that data to update the adaptive element will not be beneficial and excludes the data from being sent to the adaptive element. One mechanism for determining that data has been incorrectly received is the calculation of syndromes as part of a Forward Error Control (FEC) system. Detection of errors through use of the syndrome calculation can be supplemented through windowing to make a determination as to whether a number of received bits should be used or disregarded by the adaptive element. The adaptive element can comprise any number of decision-directed loops including adaptive processors and carrier and timing recovery loops.

摘要翻译： 本发明提供了一种用于基于接收到的数据准确的确定来选择性地更新通信接收机中的自适应元件的方法和装置。 当接收到不准确的数据时，系统确定使用该数据更新自适应元件将不是有益的，并且排除数据被发送到自适应元件。 用于确定数据未正确接收的一种机制是作为前向错误控制（FEC）系统的一部分的综合征的计算。 可以通过窗口来补充通过使用校正子计算来检测错误，以确定是否应该由自适应元件使用或忽略多个接收的比特。 自适应元件可以包括任何数量的决策导向环路，包括自适应处理器和载波和定时恢复环路。

公开(公告)号：US06782046B1

公开(公告)日：2004-08-24

申请号：US09422406

申请日：1999-10-21

申请人： Stanley K. Ling ,  Chris Heegard ,  Eric J. Rossin

发明人： Stanley K. Ling ,  Chris Heegard ,  Eric J. Rossin

IPC分类号： H03K5159

CPC分类号： H04L25/03038 ,  H04L2025/03375 ,  H04L2025/03617

摘要： A method and apparatus for decision-directed adaptation for coded modulation is presented in which a modulation decoder and data re-encoder are used to create an estimated version of a received signal based on the use of a reliable modulation code. An adaptive equalizer is used to process the received signal, and the differences between the received signal passed through the adaptive equalizer and the estimated version are used by the adaptive equalizer to set the equalizer coefficients. A variety of adaptation algorithms can be used including Least Mean Squares (LMS) and Recursive Least Squares (RLS).

摘要翻译： 提出了一种用于编码调制的决策自适应的方法和装置，其中使用调制解码器和数据重新编码器来基于使用可靠调制码来创建接收信号的估计版本。 自适应均衡器用于处理接收的信号，自适应均衡器使用通过自适应均衡器的接收信号与估计版本之间的差异来设置均衡器系数。 可以使用各种适应算法，包括最小均方（LMS）和递归最小二乘法（RLS）。

公开(公告)号：US06707868B1

公开(公告)日：2004-03-16

申请号：US09291136

申请日：1999-04-12

申请人： John R. Camagna ,  James Ward Girardeau, Jr. ,  Stanley K. Ling ,  Hiroshi Takatori

发明人： John R. Camagna ,  James Ward Girardeau, Jr. ,  Stanley K. Ling ,  Hiroshi Takatori

IPC分类号： H04L700

CPC分类号： H04L7/0058 ,  H04L25/0202 ,  H04L2025/03471

摘要： A digital timing recovery system wherein the rate conversion is independent of the sampling rate, and which may be set in a network mode or a remote mode. The invention includes a transceiver core for processing transmit and receive data at a predetermined baud rate, an analog front end for transmitting and receiving analog signals over a network, a phase detector for generating a phase error estimate and a timing controller for receiving the phase error estimate signal and generating a receive and transmit phase control signal for controlling timing of the analog front end. A selector is provided for selecting a remote mode of operation or a network mode of operation. The analog front end further includes a transmit converter for converting the transmit data at the baud rate to a digital output at a transmit rate and a digital to analog converter for converting the digital output to an analog signal, and an analog to digital converter for converting the analog receive signal to a digital receive signal and a receive converter for converting the digital receive signal at a receive rate to the baud rate. The phase detector includes a channel estimator for generating a coefficient error signal and the timing controller includes a loop filter for producing a control signal for a numerically controlled oscillator that produces a baud interrupt signal and the phase control signals.

摘要翻译： 数字定时恢复系统，其中速率转换独立于采样速率，并且其可以被设置在网络模式或远程模式中。 本发明包括用于以预定波特率处理发送和接收数据的收发机核心，用于通过网络发送和接收模拟信号的模拟前端，用于产生相位误差估计的相位检测器和用于接收相位误差的定时控制器 估计信号并产生用于控制模拟前端的定时的接收和发送相位控制信号。 提供选择器用于选择远程操作模式或网络操作模式。 模拟前端还包括发送转换器，用于将波特率的发送数据以发送速率转换为数字输出，以及用于将数字输出转换为模拟信号的数模转换器，以及用于转换的模数转换器 到数字接收信号的模拟接收信号和用于以接收速率将数字接收信号转换成波特率的接收转换器。 相位检测器包括用于产生系数误差信号的信道估计器，并且定时控制器包括用于产生用于产生波特率中断信号和相位控制信号的数控振荡器的控制信号的环路滤波器。

公开(公告)号：US07809404B2

公开(公告)日：2010-10-05

申请号：US11594403

申请日：2006-11-08

申请人： Melanie Daniels ,  Stanley K Ling ,  Raymond Blackham

发明人： Melanie Daniels ,  Stanley K Ling ,  Raymond Blackham

IPC分类号： H04M1/00

CPC分类号： H04B17/0087

摘要： Embodiments of methods and means for passively emulating channels in a multiple-input multiple output (MIMO) system are provided. Such embodiments include passively splitting a plurality of radio frequency signals into a greater plurality of such signals. Each of the greater plurality of radio frequency signals can then be selectively and passively attenuated, delayed and/or phase shifted. The resulting modified radio frequency signals are then recombined crossed over channels and coupled to a plurality of output nodes. Economical and versatile device and system testing is thus facilitated in a low-noise radio frequency environment without the need for complex up/down frequency or analog/digital conversions.

摘要翻译： 提供了在多输入多输出（MIMO）系统中被动地仿真信道的方法和装置的实施例。 这样的实施例包括将多个射频信号被动地分割成更多个这样的信号。 然后可以选择性地和被动地衰减，延迟和/或相移多个多个射频信号中的每一个。 所得到的经修改的射频信号然后在通道上重新交叉并耦合到多个输出节点。 因此，在低噪声射频环境中便利了经济且通用的设备和系统测试，而无需复杂的上/下频率或模拟/数字转换。

公开(公告)号：US07609792B2

公开(公告)日：2009-10-27

申请号：US11069172

申请日：2005-03-01

申请人： Georgios Palaskas ,  Ashoke Ravi ,  Soumyanath Krishnamurthy ,  Richard B. Nicholls ,  Keith A. Holt ,  Stanley K. Ling

发明人： Georgios Palaskas ,  Ashoke Ravi ,  Soumyanath Krishnamurthy ,  Richard B. Nicholls ,  Keith A. Holt ,  Stanley K. Ling

IPC分类号： H04B7/10

CPC分类号： H04L1/06

摘要： A multichip transceiver operates as part of a multiple-input multiple-output communication system. First receiver circuitry on a first integrated circuit processes radio-frequency (RF) signals received from a first signal source, and second receiver circuitry on a second integrated circuit processes RF signals received from a second signal source. Clock-signal generating circuitry provides clock signals through phase-matched paths to the first and second receiver circuitry.

摘要翻译： 多芯片收发器作为多输入多输出通信系统的一部分而工作。 第一集成电路上的第一接收器电路处理从第一信号源接收的射频（RF）信号，第二集成电路上的第二接收器电路处理从第二信号源接收的RF信号。 时钟信号产生电路通过相位匹配的路径提供时钟信号到第一和第二接收器电路。

公开(公告)号：US20080123756A1

公开(公告)日：2008-05-29

申请号：US11594403

申请日：2006-11-08

申请人： Melanie Daniels ,  Stanley K Ling ,  Raymond Blackham

发明人： Melanie Daniels ,  Stanley K Ling ,  Raymond Blackham

IPC分类号： H04L27/28

CPC分类号： H04B17/0087

摘要： Embodiments of methods and means for passively emulating channels in a multiple-input multiple output (MIMO) system are provided. Such embodiments include passively splitting a plurality of radio frequency signals into a greater plurality of such signals. Each of the greater plurality of radio frequency signals can then be selectively and passively attenuated, delayed and/or phase shifted. The resulting modified radio frequency signals are then recombined crossed over channels and coupled to a plurality of output nodes. Economical and versatile device and system testing is thus facilitated in a low-noise radio frequency environment without the need for complex up/down frequency or analog/digital conversions.

摘要翻译： 提供了在多输入多输出（MIMO）系统中被动地仿真信道的方法和装置的实施例。 这样的实施例包括将多个射频信号被动地分解成更多个这样的信号。 然后可以选择性地和被动地衰减，延迟和/或相移多个多个射频信号中的每一个。 所得到的经修改的射频信号然后在通道上重新交叉并耦合到多个输出节点。 因此，在低噪声射频环境中便利了经济且通用的设备和系统测试，而无需复杂的上/下频率或模拟/数字转换。

公开(公告)号：US07006564B2

公开(公告)日：2006-02-28

申请号：US09930757

申请日：2001-08-15

申请人： Stanley K. Ling ,  Hiroshi Takatori

发明人： Stanley K. Ling ,  Hiroshi Takatori

IPC分类号： H03K5/159

CPC分类号： H04L25/03057 ,  H03H21/0012 ,  H04L2025/0349 ,  H04L2025/03617

摘要： An adaptive equalizer processes an input signal that includes noise, pre-cursor intersymbol interference, and post-cursor intersymbol interference. The adaptive equalizer includes a feedforward filter which reduces the pre-cursor intersymbol interference and whitens the noise, a feedback filter which detects the post-cursor intersymbol interference in a signal that corresponds to the input signal, and circuitry which removes the detected post-cursor intersymbol interference from the input signal. The feedforward filter includes separate first and second coefficients. The first coefficients reduce the pre-cursor intersymbol interference and the second coefficients whiten the noise.

公开(公告)号：US06404810B1

公开(公告)日：2002-06-11

申请号：US09290128

申请日：1999-04-12

申请人： James Ward Girardeau, Jr. ,  Stanley K. Ling

发明人： James Ward Girardeau, Jr. ,  Stanley K. Ling

IPC分类号： H03H730

CPC分类号： H04L25/03057 ,  H04L2025/0349 ,  H04L2025/03617 ,  H04L2025/03624 ,  H04L2025/03732

摘要： An activation method for adaptive equalization in a data transceiver including a plurality of adaptive filters wherein the adaptive filters are adapted with a first type of adaptation method to obtain initial convergence of the adaptive filters during an initial activation of the data transceiver and a second type of adaptation method to optimize performance of recovering the received signals in the presence of noise.

摘要翻译： 一种用于包括多个自适应滤波器的数据收发机中的自适应均衡的激活方法，其中所述自适应滤波器适应于第一类型的自适应方法，以在所述数据收发器的初始激活期间获得所述自适应滤波器的初始收敛，以及第二类型 适应方法，以在存在噪声的情况下优化恢复接收信号的性能。

公开(公告)号：US07570698B2

公开(公告)日：2009-08-04

申请号：US10990026

申请日：2004-11-16

申请人： William J. Chimitt ,  Stanley K. Ling ,  Sumeet Sandhu

发明人： William J. Chimitt ,  Stanley K. Ling ,  Sumeet Sandhu

IPC分类号： H04L5/12

CPC分类号： H04L1/0041 ,  H04B7/0669 ,  H04B7/0697 ,  H04L1/0071 ,  H04L1/06 ,  H04L27/2602 ,  H04L27/2626

摘要： A multicarrier transmitter performs bit-interleaving suitable for transmitting more than one spatial stream over a multicarrier communication channel. The multicarrier transmitter may include a bit-grouping shifter to shift QAM symbol-bit groupings of a spatial stream among subcarriers of the multicarrier communication signal, and a bit-position permuter to rotate bits among bit positions within subgroupings of the QAM symbol-bit groupings of the second spatial stream.

摘要翻译： 多载波发射机执行适于在多载波通信信道上发送多于一个空间流的比特交织。 多载波发射机可以包括位分组移位器，以移动多载波通信信号的子载波中的空间流的QAM符号位分组，以及位置置换器，以在QAM符号位分组的子组内的位位置之间旋转位 的第二个空间流。

公开(公告)号：US6167082A

公开(公告)日：2000-12-26

申请号：US33770

申请日：1998-03-03

申请人： Stanley K. Ling ,  Ping An ,  Hiroshi Takatori

发明人： Stanley K. Ling ,  Ping An ,  Hiroshi Takatori

IPC分类号： H04L25/03 ,  H03K5/159 ,  H03H5/00

CPC分类号： H04L25/4975 ,  H04L25/03057 ,  H04L25/03343 ,  H04L2025/037

摘要： Adaptive equalization methods and adaptive equalizers used with precoded systems dominated by intersymbol interference (ISI) monitor the output of a DFE and compare it to a reference for updating a precoder in response to the comparison. To accomplish this, an adaptive equalizer includes a feed forward equalizer receiving a signal from a communication channel, the feed forward equalizer equalizing variations in pre-cursor intersymbol interference resulting from changes in characteristics of the channel and providing an output signal to an error correction decoder, a decision circuit, coupled to the feed forward equalizer, for generating error vectors in response to the output signal of the feed forward equalizer and a decision feedback equalizer, coupled to the decision circuit, the decision feedback equalizer monitoring the pre-cursor intersymbol interference of the channel, determining when the transmitter coefficients to the precoder warrant updating, and generating a signal indicating that an update to the transmitter coefficients to the precoder is warranted. The adaptive equalizer farther includes a comparison circuit, the comparison circuit receiving an output from the decision feedback equalizer and comparing the output from the decision feedback equalizer to a reference, the comparison circuit generating the signal indicating that an update to the transmitter coefficients to the precoder is warranted in response to the comparison.

摘要翻译： 与由符号间干扰（ISI）支配的预编码系统一起使用的自适应均衡方法和自适应均衡器监视DFE的输出，并将其与用于响应于比较更新预编码器的参考进行比较。 为了实现这一点，自适应均衡器包括接收来自通信信道的信号的前馈均衡器，前馈均衡器均衡由信道特性变化引起的前置符号间干扰的变化，并向纠错解码器提供输出信号 耦合到所述前馈均衡器的响应于所述前馈均衡器的输出信号的误差向量的决定电路和耦合到所述判定电路的判决反馈均衡器，所述判决反馈均衡器监视所述前标符号间干扰 确定到预编码器的发射机系数何时更新，并且产生指示对预编码器对发射机系数的更新的信号是有必要的。 所述自适应均衡器还包括比较电路，所述比较电路接收所述判决反馈均衡器的输出，并将所述判决反馈均衡器的输出与参考值进行比较，所述比较电路产生指示对所述预编码器对所述发射机系数的更新的信号 有必要回应比较。