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公开(公告)号：US06285709B1
公开(公告)日：2001-09-04
申请号：US08962204
申请日：1997-10-31
IPC分类号： H03H740
CPC分类号： H04L25/4927 , H04L25/03057
摘要： Apparatus and methods of compensating for distortions introduced in communication signals received over a telephone network. An adaptive linear equalizer (LE) pre-filter is used for filtering incoming sampled communication signals received via the telephone network transmission medium. An adaptive decision feedback equalizer (DFE) is used in conjunction with the LE to provide error filtering as a hybrid equalizer system to determine which of a plurality of communication states of the sampled communication signals as an accurate estimate of the originally transmitted signals over the transmission medium, responsive to the filtered communication signals from the LE. An error signal is generated relative to the difference between the determined states of the decision mechanism of the DFE and the filtered communication signals from the LE. Further, an error filter provides a filtered output of the generated error signal, wherein the error filter has an error filter characteristic defined in accordance with the known telephone network transmission medium. The LE for the received sampled communication signals has a LE pre-filter characteristic defined in accordance with the filtered output of the error filter, using a recursive least-mean-square (LMS) technique.
摘要翻译： 补偿在通过电话网络接收的通信信号中引入的失真的装置和方法。 自适应线性均衡器（LE）预滤波器用于滤波经由电话网络传输介质接收的输入采样通信信号。 自适应判决反馈均衡器（DFE）与LE结合使用，以提供作为混合均衡器系统的错误滤波，以确定采样的通信信号的多个通信状态中的哪一个作为传输上原始传输的信号的精确估计 介质，响应来自LE的滤波后的通信信号。 相对于DFE的判定机构的确定状态与来自LE的滤波后的通信信号之间的差异产生误差信号。 此外，误差滤波器提供产生的误差信号的滤波输出，其中误差滤波器具有根据已知的电话网络传输介质定义的误差滤波特性。 所接收的采样通信信号的LE具有使用递归最小均方（LMS）技术根据误差滤波器的滤波输出定义的LE预滤波特性。
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2.发明授权Method and apparatus for generating a probing signal for a system having non-linear network and codec distortion 有权用于产生具有非线性网络和编解码器失真的系统的探测信号的方法和装置公开(公告)号：US06256353B1
公开(公告)日：2001-07-03
申请号：US09421955
申请日：1999-10-19
IPC分类号： H04B1404
CPC分类号： H04L25/4927 , H04L1/242 , H04L5/1438 , H04L7/027 , H04L25/0226
摘要： The present invention provides a method of generating a signal that may be used to determine the characteristic response of a communication channel that utilizes the public Digital Telephone Network (DTN). The channel includes the DTN, which may have Network Digital Attenuators (NDA) and/or Robbed Bit Signalling (RBS), and a Digital-to-Analog Converter (DAC), (also known as a codec), as well as the analog characteristics of the local loop, typically a twisted pair of copper wires. The present invention provides a method and apparatus to determine the optimal sampling instant of the received data stream. The present invention provides a probing signal that is well-suited for use in determining the channel's response to a known sequence of PCM codes used as data symbols. This is especially useful in so-called PCM modulation schemes that utilize the DTN, where knowledge of network and DAC distortion predicates the selection of available PCM codes used to represent data. This information is also useful when the data receiver, or PCM modem, makes determinations of which codes were actually sent.
摘要翻译： 本发明提供一种生成可用于确定利用公共数字电话网（DTN）的通信信道的特征响应的信号的方法。 该信道包括可以具有网络数字衰减器（NDA）和/或Robbed位信令（RBS）以及数模转换器（DAC）（也称为编解码器）的DTN，以及模拟 本地环路的特性，通常是双绞铜线。 本发明提供一种确定接收数据流的最佳采样时刻的方法和装置。 本发明提供了一种非常适合用于确定信道对用作数据符号的已知PCM码的序列的响应的探测信号。 这在使用DTN的所谓PCM调制方案中特别有用，其中网络和DAC失真的知识预示着用于表示数据的可用PCM码的选择。 当数据接收器或PCM调制解调器确定实际发送哪些代码时，该信息也是有用的。
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3.发明授权Method and apparatus for regenerating symbol timing from a probing signal in a system having non-linear network and codec distortion 失效用于在具有非线性网络和编解码器失真的系统中从探测信号再生符号定时的方法和装置
公开(公告)号：US5991348A
公开(公告)日：1999-11-23
申请号：US909860
申请日：1997-08-12
CPC分类号： H04L7/027 , H04L7/0334 , H04L7/041
摘要： The present invention provides a method of generating a signal that may be used to determine the characteristic response of a communication channel that utilizes the public Digital Telephone Network (DTN). The channel includes the DTN, which may have Network Digital Attenuators (NDA) and/or Robbed Bit Signalling (RBS), and a Digital-to-Analog Converter (DAC), (also known as a codec), as well as the analog characteristics of the local loop, typically a twisted pair of copper wires. The present invention provides a method and apparatus to determine the optimal sampling instant of the received data stream. The present invention provides a probing signal that is well-suited for use in determining the channel's response to a known sequence of PCM codes used as data symbols. This is especially useful in so-called PCM modulation schemes that utilize the DTN, where knowledge of network and DAC distortion predicates the selection of available PCM codes used to represent data. This information is also useful when the data receiver, or PCM modem, makes determinations of which codes were actually sent.
摘要翻译： 本发明提供一种生成可用于确定利用公共数字电话网（DTN）的通信信道的特征响应的信号的方法。 该信道包括可以具有网络数字衰减器（NDA）和/或Robbed位信令（RBS）以及数模转换器（DAC）（也称为编解码器）的DTN，以及模拟 本地环路的特性，通常是双绞铜线。 本发明提供一种确定接收数据流的最佳采样时刻的方法和装置。 本发明提供了一种非常适合用于确定信道对用作数据符号的已知PCM码的序列的响应的探测信号。 这在使用DTN的所谓PCM调制方案中特别有用，其中网络和DAC失真的知识预示着用于表示数据的可用PCM码的选择。 当数据接收器或PCM调制解调器确定实际发送哪些代码时，该信息也是有用的。
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4.发明授权Method and apparatus for generating a probing signal for a system having non-linear network and codec distortion 失效用于产生具有非线性网络和编解码器失真的系统的探测信号的方法和装置
公开(公告)号：US5970089A
公开(公告)日：1999-10-19
申请号：US909997
申请日：1997-08-12
CPC分类号： H04L25/4927 , H04L1/242 , H04L25/0226 , H04L5/1438 , H04L7/027
摘要： The present invention provides a method of generating a signal that may be used to determine the characteristic response of a communication channel that utilizes the public Digital Telephone Network (DTN). The channel includes the DTN, which may have Network Digital Attenuators (NDA) and/or Robbed Bit Signalling (RBS), and a Digital-to-Analog Converter (DAC), (also known as a codec), as well as the analog characteristics of the local loop, typically a twisted pair of copper wires. The present invention provides a method and apparatus to determine the optimal sampling instant of the received data stream. The present invention provides a probing signal that is well-suited for use in determining the channel's response to a known sequence of PCM codes used as data symbols. This is especially useful in so-called PCM modulation schemes that utilize the DTN, where knowledge of network and DAC distortion predicates the selection of available PCM codes used to represent data. This information is also useful when the data receiver, or PCM modem, makes determinations of which codes were actually sent.
摘要翻译： 本发明提供一种生成可用于确定利用公共数字电话网（DTN）的通信信道的特征响应的信号的方法。 该信道包括可以具有网络数字衰减器（NDA）和/或Robbed位信令（RBS）以及数模转换器（DAC）（也称为编解码器）的DTN，以及模拟 本地环路的特性，通常是双绞铜线。 本发明提供一种确定接收数据流的最佳采样时刻的方法和装置。 本发明提供了一种非常适合用于确定信道对用作数据符号的已知PCM码的序列的响应的探测信号。 这在使用DTN的所谓PCM调制方案中特别有用，其中网络和DAC失真的知识预示着用于表示数据的可用PCM码的选择。 当数据接收器或PCM调制解调器确定实际发送哪些代码时，该信息也是有用的。
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5.发明授权Method of detecting network impairments for high speed data communication over conventional subscriber lines 失效通过常规用户线路检测高速数据通信的网络损伤的方法
公开(公告)号：US6115395A
公开(公告)日：2000-09-05
申请号：US944462
申请日：1997-10-06
申请人： Andrew L. Norrell , Mark A. Waldron , Vladimir G. Parizhsky , Carl H. Alelyunas , Scott A. Lery
发明人： Andrew L. Norrell , Mark A. Waldron , Vladimir G. Parizhsky , Carl H. Alelyunas , Scott A. Lery
摘要： A method of detecting the presence of signal impairments that introduce distortion in one or more time slots of a communication link by comparing a received training sequence of signal points with hypothetical received signal points, where the hypothetical points are predistorted versions of the training sequence, and are based on the known, predetermined training sequence of signal points. A detection matrix is formed where one dimension of the matrix corresponds to a time slot within a frame, preferably six time slots to a frame, and the other dimension corresponds to a particular impairment, or combination of impairments. The individual signal impairments are generally one or more of the following: robbed bit signaling where the robbed bit is replaced with a logic `0`; robbed bit signaling where the robbed bit is replaced with a logic `1`; robbed bit signaling where the robbed bit is replaced with a logic `1/2`; 3 dB digital attenuator; 6 dB digital attenuator. The hypotheses are based on individual impairments and combinations/permutations of these impairments. The minimum value of each column (corresponding to a time slot within the frame) of the detection matrix indicates the type of impairment in that time slot.
摘要翻译： 一种检测在通信链路的一个或多个时隙中引入失真的信号损伤的存在的方法，其通过将所接收的信号点的训练序列与假设的接收信号点进行比较，其中假设点是训练序列的预失真版本，以及 基于信号点的已知的预定训练序列。 形成检测矩阵，其中矩阵的一个维度对应于帧内的时隙，优选地对应于帧的六个时隙，另一个维度对应于特定的损伤或损伤的组合。 单个信号损伤通常是以下的一个或多个：抢占位信令，其中抢占位被替换为逻辑“0”; 抢夺位信号，其中抢占位被替换为逻辑“1”; 抢占位信令，其中抢占位被替换为逻辑“1/2”; 3 dB数字衰减器; 6 dB数字衰减器。 这些假设是基于个体损伤和这些损伤的组合/排列。 检测矩阵的每列（对应于帧内的时隙）的最小值表示该时隙中的损伤类型。
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公开(公告)号：US06874096B1
公开(公告)日：2005-03-29
申请号：US09887283
申请日：2001-06-21
CPC分类号： H04L7/042
摘要： A detector for detecting packet arrival time for packets received by a Home Phoneline Network Alliance (HPNA) receiver. The detector correlates received preamble symbols with stored preamble symbols and generates an estimation of the packet arrival time when the entire transmitted preamble has arrived at the receiver. The estimation of the packet arrival time is defined on a symbol period boundary. The detector includes a complex correlator with a simplified structure based on characteristic of the received HPNA signal.
摘要翻译： 用于检测由家庭电话网络联盟（HPNA）接收机接收到的分组的分组到达时间的检测器。 检测器将接收到的前导码符号与存储的前导码符号相关联，并且当整个发送的前导码到达接收机时产生对分组到达时间的估计。 分组到达时间的估计在符号周期边界上定义。 检测器包括基于所接收的HPNA信号的特性的具有简化结构的复相关器。
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公开(公告)号：US5241563A
公开(公告)日：1993-08-31
申请号：US927827
申请日：1992-08-10
申请人： Woo H. Paik , John M. Fox , Scott A. Lery
发明人： Woo H. Paik , John M. Fox , Scott A. Lery
CPC分类号： H03M13/2732 , H03M13/33
摘要： An interleaver processes information in a pseudorandom order to provide pseudorandom interleaved data for communication to a deinterleaver. The pseudorandom interleaved data is processed at the deinterleaver in a pseudorandom order corresponding to that used at the interleaver means, to recover the original information. The pseudorandom processing at the deinterleaver is synchronized with the pseudorandom processing at the interleaver on a trial and error basis. In one embodiment, full synchronization occurs when a Viterbi decoder receiving data from the deinterleaver has a renormalization rate within a designated threshold and when enough synchronization words are detected in data output from the deinterleaver to meet a predetermined criterion. In another embodiment, a timer is used to initiate a new starting address for the pseudorandom processing at the deinterleaver during successive time intervals. Synchronization is achieved when a start address is found that results in the detection of enough synchronization words in data output from the deinterleaver to meet a predetermined synchronization criterion.
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公开(公告)号：US06255967B1
公开(公告)日：2001-07-03
申请号：US09457433
申请日：1999-12-07
IPC分类号： H03M700
CPC分类号： H04L25/4927
摘要： An improved DC compensation method for use in conjunction with telephony signalling. The method includes defining a frame that includes at least two n-bit codewords. An unsigned codeword is then identified within the frame by applying a rule to the codewords in the defined frame. Next, a sign bit is appended to the unsigned codeword, thereby producing a DC compensating codeword. The sign bit is selected based upon a weighting function of the linear values associated with previously transmitted codewords. The remaining unsigned codewords in the frame are assigned sign bits from user data.
摘要翻译： 一种与电话信令结合使用的改进的直流补偿方法。 该方法包括定义包括至少两个n位码字的帧。 然后通过将规则应用于定义的帧中的码字来识别帧内的无符号码字。 接下来，将符号位附加到无符号码字，从而产生DC补偿码字。 基于与先前发送的码字相关联的线性值的加权函数来选择符号位。 帧中剩余的未签名码字从用户数据中分配符号位。
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公开(公告)号：US5995548A
公开(公告)日：1999-11-30
申请号：US888201
申请日：1997-07-07
CPC分类号： H04L1/242 , H04L25/4927 , H04L27/3411 , H04Q11/04
摘要： A combined frame mapping technique that uses aspects of Minimum Modulus Conversion (MMC) and Shell Mapping (SM) to map data bits to a sequence of data symbols, or points. The apparatus includes a shell mapper to generate ring indices from K data bits and a modulus converter to select the signal points from within the ring based on B data bits. The apparatus and method permits the use of constellations having any integer number of points per ring. Variations in the constellations from time-slot to time-slot within a frame are also accommodated. The number of rings in each constellation remains constant, but the moduli vary. MMSM produces d.sub.min equal to the best of MMC and SM, and in some cases d.sub.min, may be better than that for either MMC or SM.
摘要翻译： 使用最小模转换（MMC）和壳映射（SM）的方面的组合帧映射技术来将数据位映射到数据符号或点的序列。 该装置包括一个壳映射器，用于从K个数据位产生环形索引，以及一个模数转换器，用于根据B数据位从环内选择信号点。 该装置和方法允许使用具有每个环的任何整数个点的星座。 也适应了帧内从时隙到时隙的星座的变化。 每个星座中的环数保持不变，但是模数不同。 MMSM产生等于MMC和SM最佳的dmin，在某些情况下，dmin可能比MMC或SM更好。
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公开(公告)号：US07813439B2
公开(公告)日：2010-10-12
申请号：US11348733
申请日：2006-02-06
申请人： Andy Norrell , Scott A. Lery , Philip Desjardins , Mike Behrin
发明人： Andy Norrell , Scott A. Lery , Philip Desjardins , Mike Behrin
IPC分类号： H04L23/02
CPC分类号： H04L25/03159 , H04L1/004 , H04L25/061 , H04L25/067 , H04L27/2078 , H04L27/2647
摘要： Methods and apparatuses for reducing effects of impulse noise in a DSL transmitter receiver device are described. According to certain embodiment, the method includes comparing a hard decision output of a decoder with a soft decision output for a convolution coded modulation symbol received at a digital subscriber line (DSL) receiver. The presence of impulse noise is detected based on a lack of agreement between the hard decision output and the soft decision output.
摘要翻译： 描述了用于减少DSL发射机接收机设备中脉冲噪声影响的方法和设备。 根据某些实施例，该方法包括将解码器的硬判决输出与用于在数字用户线（DSL）接收机处接收的卷积编码调制符号的软判决输出进行比较。 基于硬判决输出与软决策输出之间缺乏一致性来检测脉冲噪声的存在。
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