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1. 发明申请

US20070063865A1 Wellbore telemetry system and method 审中-公开
标题翻译：井眼遥测系统及方法
公开(公告)号：US20070063865A1
公开(公告)日：2007-03-22
申请号：US11228111
申请日：2005-09-16
申请人： Raghu Madhavan , David Santoso , Kanu Chadha , Lise Hvatum
发明人： Raghu Madhavan , David Santoso , Kanu Chadha , Lise Hvatum
IPC分类号： G01V3/00
CPC分类号： E21B47/12 , E21B47/122
摘要： A telemetry kit for passing signals between a surface control unit and a downhole tool via a wired drill pipe telemetry system is provided. The kit has a first terminal operatively connectable to the wired drill pipe telemetry system for communication therewith, a second terminal operatively connectable to one of the surface control unit and the downhole tool for communication therewith and at least one transmission element operatively connecting the first terminal to the second terminal. The telemetry kit is positionable such that the telemetry kit traverses at least a portion of the downhole tool and/or the wired drill pipe telemetry system whereby the signals bypass the portion thereof.
摘要翻译：提供了一种用于通过有线钻杆遥测系统在表面控制单元和井下工具之间传递信号的遥测套件。所述套件具有可操作地连接到所述有线钻杆遥测系统用于与其通信的第一端子，可操作地连接到所述表面控制单元和所述井下工具中的一个用于与其通信的第二端子，以及至少一个传动元件，其将所述第一端子与第二个终端。遥测套件可定位成使得遥测套件穿过井下工具和/或有线钻杆遥测系统的至少一部分，由此信号绕过其部分。

2. 发明申请

US20080158005A1 Method and apparatus for locating faults in wired drill pipe 有权
标题翻译：定位钻杆故障的方法和装置
公开(公告)号：US20080158005A1
公开(公告)日：2008-07-03
申请号：US11648139
申请日：2006-12-29
申请人： David Santoso , Dudi Rendusara , Hiroshi Nakajima , Kanu Chadha , Raghu Madhavan , Lise Hvatum
发明人： David Santoso , Dudi Rendusara , Hiroshi Nakajima , Kanu Chadha , Raghu Madhavan , Lise Hvatum
IPC分类号： G01V3/00
CPC分类号： E21B17/028
摘要： A method for determining electrical condition of a wired drill pipe includes inducing an electromagnetic field in at least one joint of wired drill pipe. Voltages induced by electrical current flowing in at least one electrical conductor in the at least one wired drill pipe joint are detected. The electrical current is induced by the induced electromagnetic field. The electrical condition is determined from the detected voltages.
摘要翻译：一种用于确定有线钻杆的电气状况的方法包括在有线钻杆的至少一个接头中引入电磁场。检测由在至少一个有线钻管接头中的至少一个电导体中流动的电流而引起的电压。电流由感应电磁场引起。电气条件由检测到的电压确定。

3. 发明授权

US08072347B2 Method and apparatus for locating faults in wired drill pipe 有权
标题翻译：定位钻杆故障的方法和装置
公开(公告)号：US08072347B2
公开(公告)日：2011-12-06
申请号：US11648139
申请日：2006-12-29
申请人： David Santoso , Dudi Rendusara , Hiroshi Nakajima , Kanu Chadha , Raghu Madhavan , Lise Hvatum
发明人： David Santoso , Dudi Rendusara , Hiroshi Nakajima , Kanu Chadha , Raghu Madhavan , Lise Hvatum
IPC分类号： G01V3/00
CPC分类号： E21B17/028
摘要： A method for determining electrical condition of a wired drill pipe includes inducing an electromagnetic field in at least one joint of wired drill pipe. Voltages induced by electrical current flowing in at least one electrical conductor in the at least one wired drill pipe joint are detected. The electrical current is induced by the induced electromagnetic field. The electrical condition is determined from the detected voltages.
摘要翻译：一种用于确定有线钻杆的电气状况的方法包括在有线钻杆的至少一个接头中引入电磁场。检测由在至少一个有线钻管接头中的至少一个电导体中流动的电流而引起的电压。电流由感应电磁场引起。电气条件由检测到的电压确定。

4. 发明申请

US20090225662A1 MOTION-AWARE MOBILE TIME AND FREQUENCY TRACKING 有权
标题翻译：动作识别手机时间和频率跟踪
公开(公告)号：US20090225662A1
公开(公告)日：2009-09-10
申请号：US12261648
申请日：2008-10-30
申请人： Ming-Chang Tsai , Jigneshkumar Shah , Kanu Chadha
发明人： Ming-Chang Tsai , Jigneshkumar Shah , Kanu Chadha
IPC分类号： G01R31/08 , H04L7/02
CPC分类号： H04B7/2675 , H04W56/0035 , H04W56/0045
摘要： A method is provided for compensating for clock drift error and movement error of an access terminal. A forward link error is obtained that is attributable to at least a first error (e.g., clock drift error) component and a second error (e.g., movement error) component. The first error component and the second error component are estimated based on the obtained forward link error. A receive clock of the access terminal is compensated based on a combination of the first error component and the second error component. A transmit clock of the access terminal is compensated based on a difference between the first error component and the second error component. The forward link error may include a timing synchronization error between the access terminal and an access point as well as a frequency synchronization error between a forward link frequency and a baseband reference frequency.
摘要翻译：提供了一种用于补偿接入终端的时钟漂移误差和移动误差的方法。获得可归因于至少第一误差（例如，时钟漂移误差）分量和第二误差（例如，运动误差）分量的前向链路误差。基于获得的前向链路误差来估计第一误差分量和第二误差分量。基于第一误差分量和第二误差分量的组合来补偿接入终端的接收时钟。基于第一误差分量和第二误差分量之间的差异来补偿接入终端的传输时钟。前向链路错误可以包括接入终端和接入点之间的定时同步误差以及正向链路频率和基带参考频率之间的频率同步误差。

5. 发明授权

US07453792B2 Receiver architecture for pilot based OFDM systems 有权
标题翻译：基于导频的OFDM系统的接收机架构
公开(公告)号：US07453792B2
公开(公告)日：2008-11-18
申请号：US10713562
申请日：2003-11-14
申请人： Kanu Chadha , Manish Bhardwaj
发明人： Kanu Chadha , Manish Bhardwaj
IPC分类号： H04J11/00
CPC分类号： H04L27/2662 , H04L27/266 , H04L27/2675
摘要： The invention relates to a novel methodology and apparatus for clock-offset compensation and common-phase offset correction in Frequency Division Multiplexing based wireless local area network (WLAN) environment, such as an Orthogonal Frequency Division Multiplexing (OFDM) environment. A curve fit, such as a threshold-based, least mean squares (LMS) fit of phase of the pilot sub-carriers in each OFDM symbol is used to estimate and counteract the rotation of the data sub-carriers due to residual frequency offset, low frequency phase noise, and clock offset. The invention is particularly well suited to wireless channels with multipath where pilots typically undergo frequency-selective fading. The thresholding LMS is implemented in a hardware-efficient manner, offering cost advantages over a weighted-LMS alternative. Additionally, the invention uses a unique phase-feedback architecture to eliminate the effects of phase wrapping, and avoid the need to refine channel estimates during packet reception.
摘要翻译：本发明涉及一种用于基于频分复用的无线局域网（WLAN）环境中的时间偏移补偿和公共相位偏移校正的新型方法和装置，例如正交频分复用（OFDM）环境。使用曲线拟合，例如每个OFDM符号中的导频子载波的相位的基于阈值的最小均方（LMS）拟合，以估计和抵消由于残余频率偏移导致的数据子载波的旋转，低频相位噪声和时钟偏移。本发明特别适用于具有多径的无线信道，其中导频通常经历频率选择性衰落。阈值LMS以硬件有效的方式实现，提供了超过加权LMS替代方案的成本优势。此外，本发明使用独特的相位反馈架构来消除相位缠绕的影响，并且避免在分组接收期间精细化信道估计的需要。

6. 发明授权

US08498243B2 Apparatus and method for channel error control of non-exclusive multiplexing for control channels 失效
标题翻译：用于控制信道的非独占复用的信道误差控制的装置和方法
公开(公告)号：US08498243B2
公开(公告)日：2013-07-30
申请号：US12481169
申请日：2009-06-09
申请人： Ming-Chang Tsai , Jigneshkumar P. Shah , Kanu Chadha
发明人： Ming-Chang Tsai , Jigneshkumar P. Shah , Kanu Chadha
IPC分类号： H04W4/00 , H04J3/16 , H04J3/22
CPC分类号： H04L1/0003
摘要： An apparatus and method for non-exclusive multiplexing of at least one active control channel comprising preparing the at least one active control channel for transmission in a next frame using a transmitter data processor; assessing channel robustness of the at least one active control channel based on a channel robustness threshold; and if the channel robustness threshold is not met, performing constellation control or power control on the at least one active control channel which is active prior to transmitting the at least one active control channel; or if the channel robustness threshold is met, transmitting the at least one active control channel using a transmitter.
摘要翻译：一种用于至少一个主动控制信道的非排他性复用的装置和方法，包括：使用发射机数据处理器准备所述至少一个主动控制信道用于在下一帧中传输; 基于信道鲁棒性阈值来评估所述至少一个主动控制信道的信道鲁棒性; 并且如果不满足信道鲁棒性阈值，则在发送所述至少一个主动控制信道之前对所述至少一个主动控制信道执行星座控制或功率控制，所述至少一个主动控制信道是有效的; 或者如果满足信道鲁棒性阈值，则使用发射机发射所述至少一个主动控制信道。

7. 发明授权

US07894325B2 Receiver architecture for pilot based OFDM systems 有权
标题翻译：基于导频的OFDM系统的接收机架构
公开(公告)号：US07894325B2
公开(公告)日：2011-02-22
申请号：US12291905
申请日：2008-11-14
申请人： Kanu Chadha , Manish Bhardwaj
发明人： Kanu Chadha , Manish Bhardwaj
IPC分类号： H04J11/00
CPC分类号： H04L27/2662 , H04L27/266 , H04L27/2675
摘要： The invention relates to a novel methodology and apparatus for clock-offset compensation and common-phase offset correction in Frequency Division Multiplexing based wireless local area network (WLAN) environment, such as an Orthogonal Frequency Division Multiplexing (OFDM) environment. A curve fit, such as a threshold-based, least mean squares (LMS) fit of phase of the pilot sub-carriers in each OFDM symbol is used to estimate and counteract the rotation of the data sub-carriers due to residual frequency offset, low frequency phase noise, and clock offset. The invention is particularly well suited to wireless channels with multipath where pilots typically undergo frequency-selective fading. The thresholding LMS is implemented in a hardware-efficient manner, offering cost advantages over a weighted-LMS alternative. Additionally, the invention uses a unique phase-feedback architecture to eliminate the effects of phase wrapping, and avoid the need to refine channel estimates during packet reception.
摘要翻译：本发明涉及一种用于基于频分复用的无线局域网（WLAN）环境中的时间偏移补偿和公共相位偏移校正的新型方法和装置，例如正交频分复用（OFDM）环境。使用曲线拟合，例如每个OFDM符号中的导频子载波的相位的基于阈值的最小均方（LMS）拟合，以估计和抵消由于残余频率偏移导致的数据子载波的旋转，低频相位噪声和时钟偏移。本发明特别适用于具有多径的无线信道，其中导频通常经历频率选择性衰落。阈值LMS以硬件有效的方式实现，提供了超过加权LMS替代方案的成本优势。此外，本发明使用独特的相位反馈架构来消除相位缠绕的影响，并且避免在分组接收期间精细化信道估计的需要。

8. 发明申请

US20090310536A1 APPARATUS AND METHOD FOR CHANNEL ERROR CONTROL OF NON-EXCLUSIVE MULTIPLEXING FOR CONTROL CHANNELS 失效
标题翻译：用于控制通道的非独占多路复用通道错误控制的装置和方法
公开(公告)号：US20090310536A1
公开(公告)日：2009-12-17
申请号：US12481169
申请日：2009-06-09
申请人： Ming-Chang Tsai , Jigneshkumar P. Shah , Kanu Chadha
发明人： Ming-Chang Tsai , Jigneshkumar P. Shah , Kanu Chadha
IPC分类号： H04W4/00 , H04L29/02
CPC分类号： H04L1/0003
摘要： An apparatus and method for non-exclusive multiplexing of at least one active control channel comprising preparing the at least one active control channel for transmission in a next frame using a transmitter data processor; assessing channel robustness of the at least one active control channel based on a channel robustness threshold; and if the channel robustness threshold is not met, performing constellation control or power control on the at least one active control channel which is active prior to transmitting the at least one active control channel; or if the channel robustness threshold is met, transmitting the at least one active control channel using a transmitter.
摘要翻译：一种用于至少一个主动控制信道的非排他性复用的装置和方法，包括：使用发射机数据处理器准备所述至少一个主动控制信道用于在下一帧中传输; 基于信道鲁棒性阈值来评估所述至少一个主动控制信道的信道鲁棒性; 并且如果不满足信道鲁棒性阈值，则在发送所述至少一个主动控制信道之前对所述至少一个主动控制信道执行星座控制或功率控制，所述至少一个主动控制信道是有效的; 或者如果满足信道鲁棒性阈值，则使用发射机发射所述至少一个主动控制信道。

9. 发明授权

US07957343B2 Motion-aware mobile time and frequency tracking 有权
标题翻译：运动感知移动时间和频率跟踪
公开(公告)号：US07957343B2
公开(公告)日：2011-06-07
申请号：US12261648
申请日：2008-10-30
申请人： Ming-Chang Tsai , Jigneshkumar Shah , Kanu Chadha
发明人： Ming-Chang Tsai , Jigneshkumar Shah , Kanu Chadha
IPC分类号： H04W56/00 , H04L7/00 , H04J11/00
CPC分类号： H04B7/2675 , H04W56/0035 , H04W56/0045
摘要： A method is provided for compensating for clock drift error and movement error of an access terminal. A forward link error is obtained that is attributable to at least a first error (e.g., clock drift error) component and a second error (e.g., movement error) component. The first error component and the second error component are estimated based on the obtained forward link error. A receive clock of the access terminal is compensated based on a combination of the first error component and the second error component. A transmit clock of the access terminal is compensated based on a difference between the first error component and the second error component. The forward link error may include a timing synchronization error between the access terminal and an access point as well as a frequency synchronization error between a forward link frequency and a baseband reference frequency.
摘要翻译：提供了一种用于补偿接入终端的时钟漂移误差和移动误差的方法。获得可归因于至少第一误差（例如，时钟漂移误差）分量和第二误差（例如，运动误差）分量的前向链路误差。基于获得的前向链路误差来估计第一误差分量和第二误差分量。基于第一误差分量和第二误差分量的组合来补偿接入终端的接收时钟。基于第一误差分量和第二误差分量之间的差异来补偿接入终端的传输时钟。前向链路错误可以包括接入终端和接入点之间的定时同步误差以及正向链路频率和基带参考频率之间的频率同步误差。

10. 发明授权

US07733764B2 Method and system for dynamically reducing length of a delay chain 有权
标题翻译：用于动态缩短延迟链长度的方法和系统
公开(公告)号：US07733764B2
公开(公告)日：2010-06-08
申请号：US10731730
申请日：2003-12-09
申请人： Maneesh Soni , Kanu Chadha , Manish Bhardwaj
发明人： Maneesh Soni , Kanu Chadha , Manish Bhardwaj
IPC分类号： H04J11/00
CPC分类号： H04L25/05
摘要： Upon a triggering event, a delay chain shifts data out at a higher rate than incoming packets and a processor controls bypassing circuitry to reduce the latency of hardware implementations of, for example, 802.11a OFDM receivers, with long delay chains. The signal processing algorithms used to recover symbol timing need a large number of samples stored in a delay chain, often consisting of pipelined registers. Such a delay chain introduces a large lag between the time samples have been acquired by the data converters and the time they are processed. This delay makes it difficult for higher level network layer implementations to meet the deadlines of 802.11a WLAN protocol. The proposed scheme implements dynamic reduction in the depth of the delay chain once timing recovery has been performed. A multi-step scheme achieves exponential reduction in the number of elements in the delay chain in every step.
摘要翻译：在触发事件时，延迟链以比输入分组更高的速率移出数据，并且处理器控制旁路电路以减少具有长延迟链的例如802.11a OFDM接收机的硬件实现的等待时间。用于恢复符号定时的信号处理算法需要存储在延迟链中的大量采样，通常由流水线寄存器组成。这样的延迟链在由数据转换器获取的时间样本和它们被处理的时间之间引入了大的滞后。这种延迟使得较高级别的网络层实现难以满足802.11a WLAN协议的最后期限。一旦定时恢复被执行，所提出的方案实现延迟链的深度的动态降低。多步骤方案实现了每个步骤中延迟链中元素数量的指数减少。

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