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公开(公告)号：US06813311B1
公开(公告)日：2004-11-02
申请号：US09525452
申请日：2000-03-14
申请人： Debajyoti Pal , Chung-Li Lu , Sujai Chari
发明人： Debajyoti Pal , Chung-Li Lu , Sujai Chari
IPC分类号： H04B138
CPC分类号： H04B3/23
摘要： The present invention, generally speaking, provides for cancellation of non-linear distortions within the echo path of a communications system by characterizing the nonlinearity, performing digital processing of a data signal to cause substantially the same nonlinearity to be applied to the data signal, and inputting a resulting data signal to a non-linear echo-cancellation path. In an exemplary embodiment, the non-linear echo-cancellation path includes as a nonlinear echo canceller a transversal filter or the like. A separate linear echo cancellation path is also provided. Training of the nonlinear echo canceller follows training of the linear echo canceller. This technique is particularly applicable to cancelling the effects of DAC nonlinearity, which can be readily characterized. Using this technique, cancellation improvement of about 3dB can readily be obtained. Alternatively, instead of achieving a lower residual echo floor, the linearity requirements for the transmit DAC can be relaxed. A lower number of bits of precision allows for lower DAC power consumption. The technique is particularly applicable to DSL applications.
摘要翻译： 本发明一般来说通过表征非线性来提供消除通信系统的回波路径内的非线性失真，执行数据信号的数字处理以使得基本上相同的非线性被应用于数据信号，以及 将得到的数据信号输入到非线性回波消除路径。 在示例性实施例中，非线性回波消除路径包括作为非线性回波消除器的横向滤波器等。 还提供了单独的线性回波消除路径。 非线性回波消除器的训练遵循线性回波消除器的训练。 该技术特别适用于消除DAC非线性的影响，可以很容易地表征。 使用这种技术，可以容易地获得约3dB的消除改善。 或者，代替实现较低的残余回波层，可以放宽发射DAC的线性要求。 较低数位的精度允许较低的DAC功耗。 该技术特别适用于DSL应用。
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公开(公告)号：US08842791B2
公开(公告)日：2014-09-23
申请号：US13209376
申请日：2011-08-13
申请人： Sujai Chari
发明人： Sujai Chari
CPC分类号： H04B1/1036 , H04B1/109 , H04J11/0023 , H04L7/0083 , H04L25/03 , H04L27/2601
摘要： Apparatuses, methods and systems of synchronizing a receiver to a desired signal are disclosed. One method includes obtaining synchronization information of an interfering signal, and adjusting an out-of-band response of a receiver filter based at least in part on the synchronization information of the interfering signal, wherein the in-band response of the receiver filter is determined by frequency components of the desired signal.
摘要翻译： 公开了将接收机同步到期望信号的装置，方法和系统。 一种方法包括获得干扰信号的同步信息，以及至少部分地基于干扰信号的同步信息来调整接收机滤波器的带外响应，其中确定接收机滤波器的带内响应 通过所需信号的频率分量。
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公开(公告)号：US20130243062A1
公开(公告)日：2013-09-19
申请号：US13423113
申请日：2012-03-16
CPC分类号： H04L25/0204 , H04L25/03292 , H04L27/2647 , H04L2025/03414 , H04L2025/03426 , H04L2025/03726
摘要： Apparatuses, methods and systems of receive signal detection of a multi-carrier signal are disclosed. One method includes receiving a multi-carrier signal, determining a characteristic of each sub-carrier of the multi-carrier signal, and selecting a one of a plurality of receive signal detection techniques for each sub-carrier of the multi-carrier signal based on the determined characteristic of the sub-carrier.
摘要翻译： 公开了多载波信号的接收信号检测的装置，方法和系统。 一种方法包括接收多载波信号，确定多载波信号的每个子载波的特性，以及基于多载波信号的每个子载波选择多个接收信号检测技术中的一个，基于 所确定的子载波的特性。
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公开(公告)号：US20130156140A1
公开(公告)日：2013-06-20
申请号：US13326248
申请日：2011-12-14
申请人： Sujai Chari , Ssu-Pin Ma
发明人： Sujai Chari , Ssu-Pin Ma
CPC分类号： H03G3/3068 , H04B2001/1054
摘要： Apparatuses, methods and systems of selecting a gain setting of a receiver chain are disclosed. One method includes bypassing a filter portion of the receiver chain and sampling a bypass receive signal while the filter portion of the receiver chain is bypassed. If the sampled bypass receive signal is determined to be saturated greater than a threshold, then selecting a gain setting of the receive chain as a function of the saturation. Further, the filter portion of the receive chain is included while sampling a receive signal with the selected gain setting.
摘要翻译： 公开了选择接收机链的增益设置的设备，方法和系统。 一种方法包括绕过接收器链的滤波器部分并对旁路接收信号进行采样，同时接收器链的滤波器部分被旁路。 如果采样旁路接收信号被确定为饱和大于阈值，则选择接收链的增益设置作为饱和度的函数。 此外，包括接收链的滤波器部分，同时采用所选择的增益设置对接收信号进行采样。
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公开(公告)号：US20130039404A1
公开(公告)日：2013-02-14
申请号：US13209376
申请日：2011-08-13
申请人： Sujai Chari
发明人： Sujai Chari
CPC分类号： H04B1/1036 , H04B1/109 , H04J11/0023 , H04L7/0083 , H04L25/03 , H04L27/2601
摘要： Apparatuses, methods and systems of synchronizing a receiver to a desired signal are disclosed. One method includes obtaining synchronization information of an interfering signal, and adjusting an out-of-band response of a receiver filter based at least in part on the synchronization information of the interfering signal, wherein the in-band response of the receiver filter is determined by frequency components of the desired signal.
摘要翻译： 公开了将接收机同步到期望信号的装置，方法和系统。 一种方法包括获得干扰信号的同步信息，以及至少部分地基于干扰信号的同步信息来调整接收机滤波器的带外响应，其中确定接收机滤波器的带内响应 通过所需信号的频率分量。
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公开(公告)号：US08000376B2
公开(公告)日：2011-08-16
申请号：US12009712
申请日：2008-01-22
申请人： Sujai Chari
发明人： Sujai Chari
CPC分类号： H04B1/715 , H04B1/719 , H04B2001/7154
摘要： Methods of adjusting a transmit time of a wireless device are disclosed. One method includes a receiver determining a frequency hopping sequence of an interfering signal. The receiver obtains an observed pattern of at least one of time and frequency overlap between the interfering signal and a signal of interest. The receiver determines a desired pattern of at least one of time and frequency overlap between the interfering signal and the signal of interest. A desired transmit time delay of the signal of interest is adjusted based on a difference between the observed pattern and the desired pattern.
摘要翻译： 公开了调整无线设备的发送时间的方法。 一种方法包括确定干扰信号的跳频序列的接收机。 接收器获得干扰信号和感兴趣信号之间的时间和频率重叠中的至少一个的观察模式。 接收机确定干扰信号和感兴趣信号之间的时间和频率重叠中的至少一个的期望模式。 基于观察到的图案和期望图案之间的差异来调整感兴趣信号的期望的发送时间延迟。
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公开(公告)号：US20110026768A1
公开(公告)日：2011-02-03
申请号：US12843988
申请日：2010-07-27
申请人： Sujai Chari , Sanjay Mani , Thomas Kurian
发明人： Sujai Chari , Sanjay Mani , Thomas Kurian
IPC分类号： G06K9/00
CPC分类号： G06T7/0016 , G06T2207/10024 , G06T2207/30088 , G06T2207/30204
摘要： Apparatuses and methods for tracking a dermatological feature are disclosed. One method includes establishing an imaging reference proximate to an identified dermatological feature, wherein the imaging reference has a known color spectrum and known physical dimensions. A digital image sequence is obtained containing one or more images of the identified dermatological feature and the imaging reference. At least one trait of the identified dermatological feature is estimated using the imaging reference and at least one image of the digital image sequence.
摘要翻译： 公开了用于跟踪皮肤病学特征的装置和方法。 一种方法包括建立靠近识别的皮肤病学特征的成像参考，其中成像参考具有已知的色谱和已知的物理尺寸。 获得包含所识别的皮肤病学特征和成像参考的一个或多个图像的数字图像序列。 使用成像参考和数字图像序列的至少一个图像估计识别的皮肤病学特征的至少一个特征。
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公开(公告)号：US20100008400A1
公开(公告)日：2010-01-14
申请号：US12217974
申请日：2008-07-10
申请人： Sujai Chari
发明人： Sujai Chari
CPC分类号： H04L1/0036 , H04B1/7156 , H04B1/7183 , H04B7/084 , H04B7/0871 , H04B2001/71563 , H04L1/06
摘要： Methods and systems of receiving wireless signals are disclosed. One method includes a receiver characterizing signal quality parameters of receive signals for a plurality of receive diversity settings. The receiver selects a first receive diversity setting for synchronizing the receiver with the receive signal based on the characterized signal quality parameters. The receiver selects a second receive diversity setting for receiving data with the receive signal based on the characterized signal quality parameters.
摘要翻译： 公开了接收无线信号的方法和系统。 一种方法包括表征多个接收分集设置的接收信号的信号质量参数的接收机。 接收机基于所表征的信号质量参数选择用于使接收机与接收信号同步的第一接收分集设置。 接收机基于所表征的信号质量参数选择用接收信号接收数据的第二接收分集设置。
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公开(公告)号：US07324794B2
公开(公告)日：2008-01-29
申请号：US10952620
申请日：2004-09-29
申请人： Sujai Chari , Rajeev Krishnomoorthy
发明人： Sujai Chari , Rajeev Krishnomoorthy
CPC分类号： H04B7/084 , H04B7/0871
摘要： Embodiments of methods of receiving transmitted signals are disclosed. The methods include a first antenna receiving a second signal, a second antenna receiving a second signal, adjusting a phase relationship between the first signal and the second signal, combining the phase adjusted first signal and second signal, and processing the phase adjusted first signal and second signal to determine the phase adjustment for optimizing at least one of signal to noise ratio and signal to interference ratio of the combined signals.
摘要翻译： 公开了接收发射信号的方法的实施例。 所述方法包括接收第二信号的第一天线，接收第二信号的第二天线，调整第一信号和第二信号之间的相位关系，组合相位调整的第一信号和第二信号，以及处理相位调整的第一信号和 确定用于优化组合信号的信噪比和信号与干扰比中的至少一个的相位调整的第二信号。
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30.发明授权Digitally-tunable echo-cancelling analog front end for wireline communications devices 有权用于有线通信设备的数字可调回波消除模拟前端公开(公告)号：US06542477B1
公开(公告)日：2003-04-01
申请号：US09281903
申请日：1999-03-31
申请人： Debajyoti Pal , Sujai Chari , Christopher Hansen , Chung-Li Lu
发明人： Debajyoti Pal , Sujai Chari , Christopher Hansen , Chung-Li Lu
IPC分类号： H04B320
摘要： The present invention, generally speaking, provides a digitally-tunable, echo-cancelling analog front end (AFE) for wireline digital communications. The analog front end is especially useful in a High-bit-rate Digital Subscriber Line (HDSL) or HDSL2 environment. An analog echo simulation path is provided capable of simulating echo from a wide variety of echo paths. Digitally controlled attenuators are provided in the transmission path and in the analog echo simulation path. Also provided is a digital-tunable equalizer stage. The equalizer stage is tuned to match the characteristics of the receive path. The same arrangement may be adapted for various DSL technologies, i.e., xDSL. There results an analog front end that is well-adapted to high-speed wireline communications.
摘要翻译： 本发明一般地提供用于有线数字通信的数字可调谐回声消除模拟前端（AFE）。 模拟前端在高比特率数字用户线（HDSL）或HDSL2环境中特别有用。 提供了能够模拟来自各种回波路径的回波的模拟回波模拟路径。 数字控制衰减器设置在传输路径和模拟回波模拟路径中。 还提供了数字可调均衡器级。 调整均衡器级以匹配接收路径的特性。 相同的布置可以适用于各种DSL技术，即xDSL。 结果是模拟前端非常适合高速有线通信。
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