公开(公告)号：US08874998B2

公开(公告)日：2014-10-28

申请号：US12467303

申请日：2009-05-17

Applicant: Gordon Kent Walker ,  Rajiv Vijayan ,  Seong Taek Chung ,  Murali Ramaswamy Chari ,  Fuyun Ling

Inventor： Gordon Kent Walker ,  Rajiv Vijayan ,  Seong Taek Chung ,  Murali Ramaswamy Chari ,  Fuyun Ling

IPC: H03M13/00 ,  H04W52/02 ,  H04L27/34

CPC classification number: H04L27/3488 ,  H04W52/0245 ,  Y02D70/00

Abstract: A wireless communication apparatus in a hierarchically coded modulation system can use error control mechanisms generated during decoding of base layer information to predict a probability of successful demodulation of enhancement layer information. Performance in the demodulation of the base layer correlates to performance in the demodulation of the enhancement layer. The receiver can determine whether to attempt demodulation of temporally correlated enhancement layer data based in part on the predicted probability of success. If the receiver determines not to demodulate the enhancement layer, the receiver can power down the enhancement layer demodulator, or otherwise minimize the power expended in the enhancement layer demodulator.

公开(公告)号：US08428198B2

公开(公告)日：2013-04-23

申请号：US11376986

申请日：2006-03-15

Applicant: Bojan Vrcelj ,  Raghuraman Krishnamoorthi ,  Seong Taek Chung ,  Fuyun Ling

Inventor： Bojan Vrcelj ,  Raghuraman Krishnamoorthi ,  Seong Taek Chung ,  Fuyun Ling

IPC: H04L27/06

CPC classification number: H04L27/2657 ,  H04L27/2607 ,  H04L27/2665 ,  H04L27/2678 ,  H04L27/2695

Abstract: A frequency tracking method and apparatus is provided. A receiver receives OFDM symbols and determines associated frequency offset. A frequency error estimator selects a cross correlation window for determining frequency offset based on timing offset. A symbol timing estimator is used to determine the timing offset.

Abstract translation: 提供了一种频率跟踪方法和装置。 接收机接收OFDM符号并确定相关的频率偏移。 频率误差估计器基于定时偏移来选择用于确定频率偏移的互相关窗口。 使用符号定时估计器来确定定时偏移。

公开(公告)号：US08009775B2

公开(公告)日：2011-08-30

申请号：US11372931

申请日：2006-03-09

Applicant: Vinay Murthy ,  Alok Kumar Gupta ,  Seong Taek Chung ,  Fuyun Ling

Inventor： Vinay Murthy ,  Alok Kumar Gupta ,  Seong Taek Chung ,  Fuyun Ling

IPC: H04L27/06 ,  H04L7/00 ,  H04L27/00

CPC classification number: G06F1/0353 ,  H04L5/0007 ,  H04L5/0048 ,  H04L27/2659 ,  H04L27/266 ,  H04L27/2662 ,  H04L27/2675 ,  H04L27/2678

Abstract: Techniques for performing frequency control in an OFDM system are described. In one aspect, frequency acquisition is performed based on a received pilot, and frequency tracking is performed based on received OFDM symbols. For frequency acquisition, an initial frequency error estimate may be derived based on the received pilot, and an automatic frequency control (AFC) loop may be initialized with the initial frequency error estimate. For frequency tracking, a frequency error estimate may be derived for each received OFDM symbol, and the AFC loop may be updated with the frequency error estimate. Frequency error in input samples is corrected by the AFC loop with the initial frequency error estimate as well as the frequency error estimate for each received OFDM symbol. In another aspect, a variable number of samples of a received OFDM symbol are selected, e.g., based on the received OFDM symbol timing, for use for frequency error estimation.

Abstract translation: 描述在OFDM系统中执行频率控制的技术。 在一个方面，基于接收到的导频执行频率采集，并且基于接收的OFDM符号执行频率跟踪。 对于频率获取，可以基于接收到的导频来导出初始频率误差估计，并且可以利用初始频率误差估计来初始化自动频率控制（AFC）循环。 对于频率跟踪，可以针对每个接收的OFDM符号导出频率误差估计，并且可以用频率误差估计来更新AFC循环。 通过具有初始频率误差估计的AFC回路以及每个接收的OFDM符号的频率误差估计来校正输入采样中的频率误差。 在另一方面，例如基于所接收的OFDM符号定时，选择接收的OFDM符号的可变数目的样本，以用于频率误差估计。

公开(公告)号：US07830955B2

公开(公告)日：2010-11-09

申请号：US11995195

申请日：2006-07-08

Applicant: John M. Cioffi ,  Wonjong Rhee ,  Georgios Ginis ,  Seong Taek Chung

Inventor： John M. Cioffi ,  Wonjong Rhee ,  Georgios Ginis ,  Seong Taek Chung

IPC: H04B1/38

CPC classification number: H04L5/14 ,  H04L5/1438

Abstract: Configuration or otherwise controlling parameters of a Digital Subscriber Line (DSL) system related to power, band usage and margin is based on collected operational data. Operational data are collected from at least one DSL system operating under a known configuration and/or a profile. A target profile is selected based on binder-level information. The collected operational data is analyzed and conditions for changing the DSL system configuration to the target profile are evaluated, including any applicable transition rules pertaining to changing profiles. If the conditions hold, then the DSL system is instructed to operate with the target profile. Binder-level information can include deployment point information, topology information, and/or crosstalk coupling information. The controlled parameters may have values that are chosen using one or more spectrum balancing methods. Such spectrum balancing methods may be executed infrequently, and may make use of all binder-level information that is available.

Abstract translation: 与功率，频带使用和余量相关的数字用户线（DSL）系统的配置或以其他方式控制参数基于收集的操作数据。 从已知配置和/或配置文件操作的至少一个DSL系统收集操作数据。 基于绑定器级信息选择目标配置文件。 分析收集的操作数据，并评估将DSL系统配置更改为目标配置文件的条件，包括与更改配置文件有关的任何适用的转换规则。 如果条件成立，则指示DSL系统与目标配置文件一起操作。 粘合剂级信息可以包括部署点信息，拓扑信息和/或串扰耦合信息。 受控参数可以具有使用一个或多个频谱平衡方法选择的值。 这种频谱平衡方法可能不频繁地执行，并且可以利用可用的所有绑定器级信息。

公开(公告)号：US07630451B2

公开(公告)日：2009-12-08

申请号：US11330796

申请日：2006-01-11

Applicant: Bruce Collins ,  Rajeev Krishnamurthi ,  Murali Ramaswamy Chari ,  Shusheel Gautam ,  Rajiv Vijayan ,  Seong Taek Chung

Inventor： Bruce Collins ,  Rajeev Krishnamurthi ,  Murali Ramaswamy Chari ,  Shusheel Gautam ,  Rajiv Vijayan ,  Seong Taek Chung

IPC: H04L5/12

CPC classification number: H04L1/0065 ,  H04L1/0041 ,  H04L1/0045 ,  H04L1/0058 ,  H04L5/023 ,  H04L27/3488 ,  H04L2001/0098

Abstract: A media access control (MAC) layer controller can manage base layer data and enhancement layer data in a layered modulation system. The MAC layer controller can process both base layer data and enhancement layer data and map the encoded symbols to a layered modulation constellation when both are present. If data for one of the layers terminates, then the MAC layer controller can generate and supply predetermined stuffing data to the layer lacking additional data. The MAC layer controller can send a control signal to the physical layer hardware to cause the hardware to map the layered signals having the stuffing data to a modified signal constellation. The MAC controller can also generate an overhead message that indicates the occurrence of the stuffing data. The receiver can receive the overhead message and can use the information to configure the receiver for the layered modulation constellation or the modified signal constellation.

Abstract translation: 媒体访问控制（MAC）层控制器可以在分层调制系统中管理基层数据和增强层数据。 当两者都存在时，MAC层控制器可以处理基本层数据和增强层数据两者并将编码符号映射到分层调制星座。 如果其中一层的数据终止，则MAC层控制器可以生成并向缺少附加数据的层提供预定的填充数据。 MAC层控制器可以向物理层硬件发送控制信号，使得硬件将具有填充数据的分层信号映射到修改的信号星座。 MAC控制器还可以生成指示填充数据的发生的开销消息。 接收机可以接收开销消息，并且可以使用该信息来配置用于分层调制星座或修改的信号星座的接收机。

公开(公告)号：US20080219290A1

公开(公告)日：2008-09-11

申请号：US11995195

申请日：2006-07-08

Applicant: John M. Cioffi ,  Wonjong Rhee ,  Georgios Ginis ,  Seong Taek Chung

Inventor： John M. Cioffi ,  Wonjong Rhee ,  Georgios Ginis ,  Seong Taek Chung

IPC: H04L29/04

CPC classification number: H04L5/14 ,  H04L5/1438

Abstract: Configuration or otherwise controlling parameters of a DSL system related to power, band usage and margin is based on collected operational data. Operational data are collected from at least one DSL system operating under a known configuration and/or a profile. A target profile is selected based on binder-level information. The collected operational data is analyzed and conditions for changing the DSL system configuration to the target profile are evaluated, including any applicable transition rules pertaining to changing profiles. If the conditions hold, then the DSL system is instructed to operate with the target profile. Binder-level information can include deployment point information, topology information, and/or crosstalk coupling information. The controlled parameters may have values that are chosen using one or more spectrum balancing methods. Such spectrum balancing methods may be executed infrequently, and may make use of all binder-level information that is available.

Abstract translation: 配置或以其他方式控制DSL系统与功率，频带使用和裕量相关的参数是基于收集的操作数据。 从已知配置和/或配置文件操作的至少一个DSL系统收集操作数据。 基于绑定器级信息选择目标配置文件。 分析收集的操作数据，并评估将DSL系统配置更改为目标配置文件的条件，包括与更改配置文件有关的任何适用的转换规则。 如果条件成立，则指示DSL系统与目标配置文件一起操作。 粘合剂级信息可以包括部署点信息，拓扑信息和/或串扰耦合信息。 受控参数可以具有使用一个或多个频谱平衡方法选择的值。 这种频谱平衡方法可能不频繁地执行，并且可以利用可用的所有绑定器级信息。

公开(公告)号：US20060215778A1

公开(公告)日：2006-09-28

申请号：US11372931

申请日：2006-03-09

Applicant: Vinay Murthy ,  Alok Gupta ,  Seong Taek Chung ,  Fuyun Ling

Inventor： Vinay Murthy ,  Alok Gupta ,  Seong Taek Chung ,  Fuyun Ling

IPC: H04K1/10

CPC classification number: G06F1/0353 ,  H04L5/0007 ,  H04L5/0048 ,  H04L27/2659 ,  H04L27/266 ,  H04L27/2662 ,  H04L27/2675 ,  H04L27/2678

Abstract: Techniques for performing frequency control in an OFDM system are described. In one aspect, frequency acquisition is performed based on a received pilot, and frequency tracking is performed based on received OFDM symbols. For frequency acquisition, an initial frequency error estimate may be derived based on the received pilot, and an automatic frequency control (AFC) loop may be initialized with the initial frequency error estimate. For frequency tracking, a frequency error estimate may be derived for each received OFDM symbol, and the AFC loop may be updated with the frequency error estimate. Frequency error in input samples is corrected by the AFC loop with the initial frequency error estimate as well as the frequency error estimate for each received OFDM symbol. In another aspect, a variable number of samples of a received OFDM symbol are selected, e.g., based on the received OFDM symbol timing, for use for frequency error estimation.

Abstract translation: 描述在OFDM系统中执行频率控制的技术。 在一个方面，基于接收到的导频执行频率采集，并且基于接收的OFDM符号执行频率跟踪。 对于频率获取，可以基于接收到的导频来导出初始频率误差估计，并且可以利用初始频率误差估计来初始化自动频率控制（AFC）循环。 对于频率跟踪，可以针对每个接收的OFDM符号导出频率误差估计，并且可以用频率误差估计来更新AFC循环。 通过具有初始频率误差估计的AFC回路以及每个接收的OFDM符号的频率误差估计来校正输入采样中的频率误差。 在另一方面，例如基于所接收的OFDM符号定时，选择接收到的OFDM符号的可变数目的样本，以用于频率误差估计。

公开(公告)号：US08102949B2

公开(公告)日：2012-01-24

申请号：US12646543

申请日：2009-12-23

Applicant: Fuyun Ling ,  Seong Taek Chung ,  Jinxia Bai ,  Thomas Sun

Inventor： Fuyun Ling ,  Seong Taek Chung ,  Jinxia Bai ,  Thomas Sun

IPC: H03D3/22

CPC classification number: H04L27/3488 ,  H04L1/0045 ,  H04L1/0065 ,  H04L1/0066 ,  H04L27/2604 ,  H04L2001/0098

Abstract: A system and method are provided for generating bit log likelihood ratio (LLR) values for two-layered Quadrature Phase-Shift Keying (QPSK) turbo decoding in a wireless communications user terminal (UT). The method includes receiving a two-layered QPSK signal with an energy ratio that is unknown, but typically defined as either k12 or k22. The method selects a mismatched energy ratio (k2) between k12 and k22, and generating bit LLR values for two-layered QPSK turbo decoding, using the mismatched k2 energy ratio. For example, if the received two-layered QPSK signal is known to have an energy ratio of about 4 or about 6.25. Then, k2 is selected to be about 5.0625. Alternately stated, the mismatched k2 energy ratio in selected by determining the approximate midpoint between k12 and k22.

Abstract translation: 提供了一种用于在无线通信用户终端（UT）中生成用于双层正交相移键控（QPSK）turbo解码的比特对数似然比（LLR）值的系统和方法。 该方法包括以未知的能量比接收两层QPSK信号，但通常定义为k12或k22。 该方法选择k12和k22之间的不匹配能量比（k2），并使用不匹配的k2能量比生成双层QPSK turbo解码的比特LLR值。 例如，如果已知所接收的两层QPSK信号具有约4或约6.25的能量比。 然后，选择k2为约5.0625。 或者说，通过确定k12和k22之间的近似中点，选择的不匹配的k2能量比。

公开(公告)号：US07924736B2

公开(公告)日：2011-04-12

申请号：US11995194

申请日：2006-07-08

Applicant: John M. Cioffi ,  Wonjong Rhee ,  Bin Lee ,  Seong Taek Chung ,  Georgios Ginis

Inventor： John M. Cioffi ,  Wonjong Rhee ,  Bin Lee ,  Seong Taek Chung ,  Georgios Ginis

IPC: H04L12/26

CPC classification number: H04L41/145 ,  H04L41/0213 ,  H04L41/0803 ,  H04L41/0853 ,  H04M3/2209 ,  H04M3/2263 ,  H04M3/247 ,  H04M11/062

Abstract: Estimates of a communication system configuration, such as a DSL system, are based on operational data collected from a network element management system, protocol and users. The operational data collected from the system can include performance-characterizing operational data that typically is available in the OSL system via element-management-system protocols. Generated estimates and/or approximations can be used in evaluating system performance and directly or indirectly dictating/requiring changes or recommending improvements in operation by transmitters and/or other parts of the indication system. Data and/or other information may be collected using internal means or using system elements and components via e-mail and/or other extra means. The likelihood of the models accuracy can be based on various data, information and/or indicators of system performance, such as observed normal operational data, test data and/or prompted operational data that shows operating performance based on stimulation signals.

Abstract translation: 诸如DSL系统的通信系统配置的估计基于从网元管理系统，协议和用户收集的操作数据。 从系统收集的操作数据可以包括通过元件管理系统协议通常在OSL系统中可用的性能特征的操作数据。 生成的估计和/或近似值可以用于评估系统性能，并且直接或间接地指示/要求改变或者通过发射机和/或指示系统的其它部分来推荐改进操作。 数据和/或其他信息可以使用内部手段或通过电子邮件和/或其他额外方式使用系统元件和组件来收集。 模型精度的可能性可以基于系统性能的各种数据，信息和/或指示符，例如观察到的正常操作数据，测试数据和/或显示基于刺激信号的操作性能的提示操作数据。

公开(公告)号：US20100098192A1

公开(公告)日：2010-04-22

申请号：US12646543

申请日：2009-12-23

Applicant: Fuyun Ling ,  Seong Taek Chung ,  Jinxia Bai ,  Thomas Sun

Inventor： Fuyun Ling ,  Seong Taek Chung ,  Jinxia Bai ,  Thomas Sun

IPC: H03D3/22 ,  H04J11/00

CPC classification number: H04L27/3488 ,  H04L1/0045 ,  H04L1/0065 ,  H04L1/0066 ,  H04L27/2604 ,  H04L2001/0098

Abstract: A system and method are provided for generating bit log likelihood ratio (LLR) values for two-layered Quadrature Phase-Shift Keying (QPSK) turbo decoding in a wireless communications user terminal (UT). The method includes receiving a two-layered QPSK signal with an energy ratio that is unknown, but typically defined as either k12 or k22. The method selects a mismatched energy ratio (k2) between k12 and k22, and generating bit LLR values for two-layered QPSK turbo decoding, using the mismatched k2 energy ratio. For example, if the received two-layered QPSK signal is known to have an energy ratio of about 4 or about 6.25. Then, k2 is selected to be about 5.0625. Alternately stated, the mismatched k2 energy ratio in selected by determining the approximate midpoint between k12 and k22.

Abstract translation: 提供了一种用于在无线通信用户终端（UT）中生成用于双层正交相移键控（QPSK）turbo解码的比特对数似然比（LLR）值的系统和方法。 该方法包括以未知的能量比接收两层QPSK信号，但通常定义为k12或k22。 该方法选择k12和k22之间的不匹配能量比（k2），并使用不匹配的k2能量比生成双层QPSK turbo解码的比特LLR值。 例如，如果已知所接收的两层QPSK信号具有约4或约6.25的能量比。 然后，选择k2为约5.0625。 或者说，通过确定k12和k22之间的近似中点，选择的不匹配的k2能量比。