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51.发明申请System and Method for Linear Distortion Estimation By Way of Equalizer Coefficients 有权通过均衡器系数的线性变形估计的系统和方法公开(公告)号：US20120076193A1
公开(公告)日：2012-03-29
申请号：US13310275
申请日：2011-12-02
申请人： Thomas J. Kolze , Bruce J. Currivan
发明人： Thomas J. Kolze , Bruce J. Currivan
IPC分类号： H04L27/01
CPC分类号： H04L25/03019 , H04B1/1027 , H04B1/123 , H04L25/022 , H04L25/03343 , H04L2025/03617
摘要： Provided is a method and system for estimating distortion in a communications channel including an adaptive equalizer. The method includes determining one or more adaptive filter coefficients associated with a signal passed through the equalizer. The method also includes estimating un-equalized channel distortion based upon the determined adaptive filter coefficients.
摘要翻译： 提供了一种用于估计包括自适应均衡器的通信信道中的失真的方法和系统。 该方法包括确定与通过均衡器的信号相关联的一个或多个自适应滤波器系数。 该方法还包括基于所确定的自适应滤波器系数估计不均衡的信道失真。
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52.发明授权System and method for linear distortion estimation by way of equalizer coefficients 失效通过均衡器系数进行线性失真估计的系统和方法公开(公告)号：US08073086B2
公开(公告)日：2011-12-06
申请号：US12561736
申请日：2009-09-17
申请人： Thomas J. Kolze , Bruce J. Currivan
发明人： Thomas J. Kolze , Bruce J. Currivan
IPC分类号： H04B1/10
CPC分类号： H04L25/03019 , H04B1/1027 , H04B1/123 , H04L25/022 , H04L25/03343 , H04L2025/03617
摘要： Provided is a method and system for estimating distortion in a communications channel including an adaptive equalizer. The method includes determining one or more adaptive filter coefficients associated with a signal passed through the equalizer. The method also includes estimating un-equalized channel distortion based upon the determined adaptive filter coefficients.
摘要翻译： 提供了一种用于估计包括自适应均衡器的通信信道中的失真的方法和系统。 该方法包括确定与通过均衡器的信号相关联的一个或多个自适应滤波器系数。 该方法还包括基于所确定的自适应滤波器系数估计不均衡的信道失真。
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公开(公告)号：US20090161782A1
公开(公告)日：2009-06-25
申请号：US12340603
申请日：2008-12-19
申请人： Thomas J. Kolze , Bruce J. Currivan
发明人： Thomas J. Kolze , Bruce J. Currivan
CPC分类号： H04L25/061 , H04L25/022 , H04L25/0228 , H04L25/0236 , H04L25/03292 , H04L27/2647
摘要： Characterizing channel response based on composite gain determination. Based on tracked amplitude modulation (e.g., which may be hum modulation), compensation for amplitude modulation is applied across all orthogonal signal components of a non-time based orthogonal coded signal. Some examples of such non-time based orthogonal coded signals include an orthogonal frequency division multiplexing (OFDM) signal, a synchronous code division multiple access (S-CDMA) signal, or a code division multiple access (CDMA) signal, etc. The compensation may be applied to the signal across multiple frames, on a frame by frame basis, or intra-frame (i.e., changing and compensating differently within a frame). This compensation for amplitude modulation may be applied in conjunction with adaptive equalization in which different filter taps are applied to each respective orthogonal signal component of the signal. Also, automatic gain control (AGC) may be performed (e.g., before digital sampling) of a received signal in conjunction with the amplitude modulation compensation.
摘要翻译： 基于复合增益确定来表征信道响应。 基于跟踪的幅度调制（例如，其可以是哼声调制），对于基于非时间的正交编码信号的所有正交信号分量施加幅度调制的补偿。 这种非时间正交编码信号的一些示例包括正交频分复用（OFDM）信号，同步码分多址（S-CDMA）信号或码分多址（CDMA）信号等）。 可以跨越多个帧，逐帧地应用于信号，或者帧内（即在一帧内不同地改变和补偿）。 对幅度调制的这种补偿可以结合自适应均衡来应用，其中不同的滤波器抽头被应用于信号的每个相应的正交信号分量。 此外，结合幅度调制补偿，可以对接收信号进行自动增益控制（AGC）（例如，在数字采样之前）。
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公开(公告)号：US07529289B2
公开(公告)日：2009-05-05
申请号：US10427593
申请日：2003-05-01
CPC分类号： H04L27/3411 , H04B1/71 , H04B1/7107 , H04B7/216 , H04L25/03038 , H04L25/03343 , H04L25/49 , H04L27/3405 , H04L2025/03375 , H04L2025/03477 , H04N7/17309 , H04N21/42676
摘要： Signal processing under attenuated transmission conditions. Within an orthogonal signal space, the number of orthogonal signals that are used to transmit information from a transmitter to a receiver is reduced and the transmitted power of each of the now remaining orthogonal signals is modified; this may involve increasing the power of all of the remaining orthogonal signals equally or alternatively modifying them individually. The same modulation used before the reduction may also be used afterwards; within communication systems having multiple transmitter-receiver paths, this will ensure that the communication system's throughput and efficiency will remain unchanged even when one (or more) transmitter-receiver paths are highly attenuated. In addition, robust mode operation is provided for ranging and registering of transmitter devices when entering the communication system. In addition, the unused orthogonal signals may be employed to support interference cancellation of those orthogonal signals that are used to transmit information.
摘要翻译： 衰减传输条件下的信号处理。 在正交信号空间内，减少了用于从发射机向接收机发送信息的正交信号的数量，并且修改了现在剩余的正交信号中的每一个的发射功率; 这可能涉及增加所有剩余的正交信号的功率，或者可以分别修改它们。 在还原之前使用的相同调制也可以随后使用; 在具有多个发射机 - 接收机路径的通信系统内，即使当一个（或多个）发射机 - 接收机路径被高度衰减时，这将确保通信系统的吞吐量和效率将保持不变。 另外，提供鲁棒模式操作，用于在进入通信系统时测距和注册发射机设备。 此外，可以采用未使用的正交信号来支持用于发送信息的那些正交信号的干扰消除。
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55.发明授权Cancellation of interference in a communication system with application to S-CDMA 有权消除应用于S-CDMA的通信系统中的干扰公开(公告)号：US07457352B2
公开(公告)日：2008-11-25
申请号：US11522842
申请日：2006-09-18
IPC分类号： H04B1/707
CPC分类号： H04B7/216 , H04B1/71 , H04B1/7102 , H04B1/7105 , H04B1/7107 , H04J13/0003 , H04J13/16
摘要： Cancellation of interference in a communication system with application to S-CDMA. A relatively straight-forward implemented and computationally efficient approach of selecting a predetermined number of unused codes is used to perform weighted linear combination selectively with each of the input spread signals in a multiple access communication system. If desired, the predetermined number of unused codes is always the same in each implementation. Alternatively, the predetermined number of unused codes is selected from within a reordered code matrix using knowledge that is shared between the two ends of a communication system, such as between the CMs and a CMTS. While the context of an S-CDMA communication system having CMs and a CMTS is used, the solution is generally applicable to any communication system that seeks to cancel narrowband interference. Several embodiments are also described that show the generic applicability of the solution across a wide variety of systems.
摘要翻译： 消除应用于S-CDMA的通信系统中的干扰。 使用选择预定数量的未使用代码的相对直接的实现和计算上有效的方法来在多址通信系统中与每个输入扩展信号选择性地执行加权线性组合。 如果需要，在每个实现中，预定数量的未使用代码总是相同的。 或者，使用在诸如CM和CMTS之间的通信系统的两端之间共享的知识，从重排序代码矩阵中选择预定数量的未使用代码。 虽然使用具有CM和CMTS的S-CDMA通信系统的上下文，但该解决方案通常适用于试图取消窄带干扰的任何通信系统。 还描述了几个实施例，其显示了解决方案在各种系统上的通用适用性。
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56.发明授权公开(公告)号：US08471745B2
公开(公告)日：2013-06-25
申请号：US13349260
申请日：2012-01-12
IPC分类号： H03M1/66
CPC分类号： H04B1/10 , H03M1/0614 , H03M1/68
摘要： Digital to analog converter (DAC) with ternary or tri-state current source. A DAC including a number of ternary or tri-state devices operates based upon codewords provided thereto. Generally, each respective codeword bit directs operation of one of the respective ternary or tri-state devices within the DAC. Each ternary or tri-state device operates in at least three respective operational states (e.g., based upon the respective values of +1, −1, or 0 being provided thereto). In a current source implementation, each respective current source is implemented to deliver current, draw current, or neither delivered or draw current. In a voltage source implementation, each respective voltage source is implemented to provide a positive voltage, a negative voltage, or provide no voltage. A DAC coding table may be designed based upon characterization of codewords provided to one or more DACs (e.g., based upon a distribution, a probability density function (PDF), etc. of such codewords).
摘要翻译： 具有三态或三态电流源的数模转换器（DAC）。 包括多个三态或三态设备的DAC基于提供给它的码字来操作。 通常，每个相应的码字比特指示DAC内的相应三态或三态设备之一的操作。 每个三态或三态设备以至少三个相应的操作状态（例如，基于向其提供+1，-1或0的相应值）操作。 在当前的源实现中，实现每个相应的电流源以传递电流，绘制电流，或者不传送或绘制电流。 在电压源实现中，实施每个相应的电压源以提供正电压，负电压或不提供电压。 可以基于提供给一个或多个DAC（例如，基于分布，这种码字的概率密度函数（PDF）等）的码字的表征来设计DAC编码表。
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公开(公告)号：US08411791B2
公开(公告)日：2013-04-02
申请号：US13223124
申请日：2011-08-31
CPC分类号： H04B1/10 , H03M1/0614 , H03M1/68
摘要： Distortion and aliasing reduction for digital to analog conversion. Synthesis of one or more distortion terms made based on a digital signal (e.g., one or more digital codewords) is performed in accordance with digital to analog conversion. The one or more distortion terms may correspond to aliased higher-order harmonics, distortion, nonlinearities, clipping, etc. Such distortion terms may be known a priori, such as based upon particular characteristics of a given device, operational history, etc. Alternatively, such distortion terms may be determined based upon operation of a device and/or based upon an analog signal generated from the analog to conversion process. For example, frequency selective measurements made based on an analog signal generated from the digital to analog conversion may be used for determination of and/or adaptation of the one or more distortion terms. One or more DACs may be employed within various architectures operative to perform digital to analog conversion.
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公开(公告)号：US08406340B2
公开(公告)日：2013-03-26
申请号：US13223156
申请日：2011-08-31
CPC分类号： H04B1/10 , H03M1/0614 , H03M1/68
摘要： Distortion and aliasing reduction for digital to analog conversion. Synthesis of one or more distortion terms made based on a digital signal (e.g., one or more digital codewords) is performed in accordance with digital to analog conversion. The one or more distortion terms may correspond to aliased higher-order harmonics, distortion, nonlinearities, clipping, etc. Such distortion terms may be known a priori, such as based upon particular characteristics of a given device, operational history, etc. Alternatively, such distortion terms may be determined based upon operation of a device and/or based upon an analog signal generated from the analog to conversion process. For example, frequency selective measurements made based on an analog signal generated from the digital to analog conversion may be used for determination of and/or adaptation of the one or more distortion terms. One or more DACs may be employed within various architectures operative to perform digital to analog conversion.
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59.发明申请公开(公告)号：US20130064323A1
公开(公告)日：2013-03-14
申请号：US13613328
申请日：2012-09-13
CPC分类号： H04N21/437 , H03M13/29 , H03M13/2957 , H03M13/2966 , H03M13/6511 , H04L12/2801 , H04N7/17309
摘要： A method of transmitting data in a cable modem system includes the steps of encoding the data using forward error correction. The data is then encoded with Turbo encoding. The data is then sent to a modulation scheme. The data is then transmitted over a cable channel. The data is then demodulated. The data is then decoded using a Turbo decoder. An inverse of the forward error correction is then applied to the data.
摘要翻译： 在电缆调制解调器系统中发送数据的方法包括使用前向纠错对数据进行编码的步骤。 然后使用Turbo编码对数据进行编码。 然后将数据发送到调制方案。 然后通过有线信道传输数据。 然后解调数据。 然后使用Turbo解码器对数据进行解码。 然后将前向纠错的逆向应用于数据。
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公开(公告)号：US20130010897A1
公开(公告)日：2013-01-10
申请号：US13620468
申请日：2012-09-14
IPC分类号： H04L27/36
CPC分类号： H04L27/3416 , H03M13/253 , H04L1/0057 , H04L1/0065 , H04L27/36
摘要： A method and apparatus is disclosed to map a sequence of data to Quadrature Amplitude Modulation (QAM) constellation symbols. The method and apparatus encodes only a portion of the sequence of data and leaves a remaining portion of the sequence of data unencoded. The encoded portion of the sequence of data and the remaining unencoded portion of the sequence of data are then mapped into modulation symbols of the QAM constellation. The encoded portion of the sequence of data selects subsets of the QAM constellation, and the remaining unencoded portion of the sequence of data determines a specific modulation symbol within each subset of the QAM constellation.
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