公开(公告)号：US07068649B2

公开(公告)日：2006-06-27

申请号：US09922385

申请日：2001-08-03

申请人： Kevin Fisher ,  Scott A. Lery ,  Andrew L. Norrell

发明人： Kevin Fisher ,  Scott A. Lery ,  Andrew L. Norrell

IPC分类号： H04L12/66

CPC分类号： H04L12/2838 ,  H04L12/2803 ,  H04L2012/2845 ,  H04M11/062

摘要： An extended bandwidth HomePNA system uses a transmit spectrum having a greater bandwidth than the bandwidth specified by a HomePNA 2.0 communication standard. The extended bandwidth system of the invention provides for additional copies of a spectrum of a 2 Mbaud training signal for better accuracy in decoding transmitted data by a receiver. In one embodiment, the extended bandwidth is a 12 MHz band centered at 10 MHz, from 4 MHz to 16 MHz. This extended bandwidth allows for three copies of a 4 Mbaud training sequence or six copies of a 2 Mbaud training sequence. The extended bandwidth of the invention is compatible with a HomePNA 2.0 system by providing a training sequence that enables a HomePNA 2.0 receiver in 2 Mbaud mode to train on the transmitted signal and determine that the transmitted signal is not intended for the HomePNA 2.0 receiver in 2 Mbaud mode.

公开(公告)号：US5363408A

公开(公告)日：1994-11-08

申请号：US852330

申请日：1992-03-24

申请人： Woo H. Paik ,  Scott A. Lery ,  John M. Fox

发明人： Woo H. Paik ,  Scott A. Lery ,  John M. Fox

IPC分类号： H04L27/34 ,  H04L1/00 ,  H04L7/00 ,  H04L27/00 ,  H04N7/00 ,  H04L5/12 ,  H04L23/02

CPC分类号： H04L1/0059 ,  H04L1/0071 ,  H04L27/0012 ,  H04N5/211

摘要： A quadrature amplitude modulation (QAM) communication system is provided in which data can be communicated in any one of a plurality of QAM modes, such as 16-QAM, 32-QAM, and 64-QAM. A receiver detects the particular QAM mode transmitted on a trial and error basis, by attempting to decode the received data using different QAM modes until a synchronization condition is detected. The synchronization condition can require that a plurality of different synchronization tests be met. In a specific embodiment, a first synchronization test is met when a renormalization rate of a trellis decoder is below a threshold value. A second synchronization test is met when a first synchronization word is detected in the received data. A third and final synchronization test is met when a second synchronization word is detected in the received data. In order to reduce the cost of the receiver, most of the QAM mode dependent components are implemented using look-up tables stored in PROMs.

摘要翻译： 提供了一种正交幅度调制（QAM）通信系统，其中可以以诸如16-QAM，32-QAM和64-QAM的多个QAM模式中的任何一个来传送数据。 接收机通过尝试使用不同的QAM模式对接收到的数据进行解码，直到检测到同步状态，来检测基于试错法发送的特定QAM模式。 同步条件可以要求满足多个不同的同步测试。 在具体实施例中，当网格解码器的重正化率低于阈值时，满足第一同步测试。 当在接收的数据中检测到第一同步字时，满足第二同步测试。 当在接收的数据中检测到第二同步字时，满足第三次和最后一次同步测试。 为了降低接收机的成本，使用存储在PROM中的查找表来实现大多数QAM模式相关组件。

公开(公告)号：US5321725A

公开(公告)日：1994-06-14

申请号：US908407

申请日：1992-07-10

申请人： Woo H. Paik ,  Scott A. Lery ,  Chris Heegard ,  Edward A. Krause ,  Jerrold A. Heller

发明人： Woo H. Paik ,  Scott A. Lery ,  Chris Heegard ,  Edward A. Krause ,  Jerrold A. Heller

IPC分类号： H03M13/25 ,  G06T9/00 ,  H03M13/23 ,  H03M13/29 ,  H04L1/00 ,  H04L27/00 ,  H04L27/34 ,  H04N7/015 ,  H04N7/24 ,  H04N7/66 ,  H04N19/00 ,  H04N21/2383 ,  H04N21/438 ,  H04L5/12

CPC分类号： H04L1/0057 ,  H04L1/006 ,  H04L1/0065 ,  H04L1/0071 ,  H04L27/3438 ,  H04N21/2383 ,  H04N21/4382 ,  H04N7/015

摘要： A method and apparatus for communicating high definition television signals is provided. Video signals are divided into blocks of PCM data. The PCM data is processed using motion estimation and compensation to provide DPCM data. For each block, one of PCM and DPCM data is selected for transmission based on a predetermined criteria. The selected data is compressed using the discrete cosine transform to provide blocks of transform coefficients. The coefficients are quantized to improve their coding efficiency and variable length coded. The variable length coded coefficients are coded using a concatenated coding scheme with a Reed-Solomon outer code and trellis inner code to provide coded signals for transmission. The coded signals are transmitted using QAM.

摘要翻译： 提供了一种用于传送高分辨率电视信号的方法和装置。 视频信号被分成PCM数据块。 使用运动估计和补偿来处理PCM数据以提供DPCM数据。 对于每个块，基于预定标准选择PCM和DPCM数据之一用于传输。 使用离散余弦变换压缩所选择的数据以提供变换系数块。 量化系数以提高其编码效率和可变长度编码。 可变长度编码系数使用具有Reed-Solomon外部码和网格内部码的级联编码方案进行编码，以提供用于传输的编码信号。 使用QAM传输编码信号。

公开(公告)号：US5311546A

公开(公告)日：1994-05-10

申请号：US53962

申请日：1993-04-27

申请人： Woo H. Paik ,  Scott A. Lery ,  Adam S. Tom

发明人： Woo H. Paik ,  Scott A. Lery ,  Adam S. Tom

IPC分类号： H04B3/06 ,  H04L25/03 ,  H04L27/38 ,  H04B3/04 ,  H04L27/06

CPC分类号： H04L25/0314 ,  H04L27/3827

摘要： A method and apparatus are provided for adaptively equalizing data signals in a communications receiver. An unequalized data signal is demodulated. The demodulated data signal is filtered in an adaptive equalizer that initially updates adaptive filter coefficients using error signals derived from a first algorithm. A carrier lock signal is generated when a phase error of a filtered signal output from the adaptive equalizer reaches a threshold value. The adaptive filter coefficients are updated using error signals derived from a second algorithm instead of the first algorithm in response to the carrier lock signal. The first algorithm is a self-recovering equalization algorithm such as the Constant Modulus Algorithm. The second algorithm can be a decision directed algorithm. Carrier phase is recovered without the use of a phase rotator or phase de-rotator, by locating the adaptive equalizer inside of the carrier recovery loop. The invention is particularly adapted for use in the recovery of multilevel amplitude modulated data, such as QAM data.

摘要翻译： 提供了一种用于在通信接收机中自适应地均衡数据信号的方法和装置。 解调不平等的数据信号。 解调数据信号在自适应均衡器中被滤波，自适应均衡器最初使用从第一算法得到的误差信号来更新自适应滤波器系数。 当从自适应均衡器输出的滤波信号的相位误差达到阈值时，产生载波锁定信号。 响应于载波锁定信号，使用从第二算法而不是第一算法导出的误差信号来更新自适应滤波器系数。 第一种算法是自恢复均衡算法，如恒模算法。 第二种算法可以是决策指导算法。 通过将自适应均衡器定位在载波恢复环路内部，不使用相位旋转器或相位去旋转器来恢复载波相位。 本发明特别适用于恢复诸如QAM数据的多电平幅度调制数据。

公开(公告)号：US5233629A

公开(公告)日：1993-08-03

申请号：US736738

申请日：1991-07-26

申请人： Woo H. Paik ,  Scott A. Lery ,  Chris Heegard

发明人： Woo H. Paik ,  Scott A. Lery ,  Chris Heegard

IPC分类号： H03M13/25 ,  G06T9/00 ,  H03M13/23 ,  H03M13/29 ,  H04L1/00 ,  H04L27/00 ,  H04L27/34 ,  H04N7/015 ,  H04N7/24 ,  H04N7/66 ,  H04N19/00 ,  H04N21/2383 ,  H04N21/438

CPC分类号： H04L1/0057 ,  H04L1/006 ,  H04L1/0065 ,  H04L1/0071 ,  H04L27/3438 ,  H04N21/2383 ,  H04N21/4382 ,  H04N7/015

摘要： Coded modulation schemes based on codes for QPSK modulation are directly incorporated into QAM based modulation systems, forming trellis coded QAM for communicating information. Concatenated coding with QPSK based trellis coding and symbol error correcting coding is used. In an encoder, an N-bit QAM constellation pattern is divided into four subsets, each including N/4 symbol points of the constellation pattern. A two-bit QPSK codeword is assigned to each of the four subsets. A symbol to be transmitted is first encoded using an outer error correcting encoding algorithm. Part of the symbol is then encoded with an inner code that comprises a rate 1/2 trellis encoding algorithm to provide a QPSK codeword, which is mapped with the remaining bits of the symbol to provide a modulation function. The remaining bits correlate the symbol with one of the symbol points included in the subset defined by the QPSK codeword. A receiver is provided to recover information from the modulation function.

公开(公告)号：US06285709B1

公开(公告)日：2001-09-04

申请号：US08962204

申请日：1997-10-31

申请人： Carl H. Alelyunas ,  Scott A. Lery ,  Andrew L. Norrell ,  Vladimir Parizhsky

发明人： Carl H. Alelyunas ,  Scott A. Lery ,  Andrew L. Norrell ,  Vladimir Parizhsky

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。

公开(公告)号：US06256353B1

公开(公告)日：2001-07-03

申请号：US09421955

申请日：1999-10-19

申请人： Carl H. Alelyunas ,  Scott A. Lery ,  Vladimir Parizhsky

发明人： Carl H. Alelyunas ,  Scott A. Lery ,  Vladimir Parizhsky

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。

公开(公告)号：US6084883A

公开(公告)日：2000-07-04

申请号：US944461

申请日：1997-10-06

申请人： Andrew L. Norrell ,  Scott A. Lery

发明人： Andrew L. Norrell ,  Scott A. Lery

IPC分类号： H04L25/49 ,  H04L27/34 ,  H04L12/28

CPC分类号： H04L25/4927 ,  H04L27/3411

摘要： A method of encoding data into a digital sequence to be transmitted over the DTN so as to cause the DTN's codec to generate a multiple modulus M-ary signal in a manner that will facilitate efficient data transmission and recovery (decoding) by the distant end receiver, even in the presence of robbed-bit signaling (RBS). The preferred embodiments provide an apparatus and method of converting blocks of binary data to a corresponding block of M.sub.1 -ary, M.sub.2 -ary, . . . , M.sub.n symbols using Multiple Modulus Conversion (MMC) to maximize the data rate, while minimizing the required Signal-to-Noise Ratio (SNR) to achieve a desired error rate, in a system having a transmitter connected to the DTN via direct digital access and a receiver connected over a conventional analog subscriber line. A subset of codec codewords is used to represent the M-ary signals. For each time slot (symbol time) one of M separate octets are selected for transmission by the encoder, and the encoder's output is sent through the DTN to a subscriber loop codec. The value of M can vary among the different time slots. The analog output of the codec corresponds to M-level, or M-ary pulse amplitude modulation, because each of the transmitted octets is converted to one of M analog voltages at the DTN's codec before being communicated over the subscriber loop.

摘要翻译： 将数据编码为通过DTN发送的数字序列的方法，以便使得DTN编解码器以便于远端终端的有效数据传输和恢复（解码）的方式产生多模M信号 ，即使存在抢占信令（RBS）。 优选实施例提供了一种将二进制数据块转换为相应的M1-ary，M2-ary块的装置和方法。 。 。 ，使用多模转换（MMC）的Mn符号以最大化数据速率，同时在具有通过直接数字访问连接到DTN的发射机的系统中将所需的信噪比（SNR）最小化以实现期望的误码率 以及通过常规模拟用户线连接的接收器。 编解码码字的子集用于表示M元信号。 对于每个时隙（符号时间），选择M个分离的八位字节之一用于由编码器传输，并且编码器的输出通过DTN发送到用户环路编解码器。 M的值可以在不同的时隙之间变化。 因为编解码器的模拟输出对应于M级或M级脉冲幅度调制，因为在通过用户环路通信之前，每个发送的八位位组都被转换为DTN编解码器的M个模拟电压之一。

公开(公告)号：US5991348A

公开(公告)日：1999-11-23

申请号：US909860

申请日：1997-08-12

申请人： Carl H. Alelyunas ,  Scott A. Lery ,  Vladimir Parizhsky

发明人： Carl H. Alelyunas ,  Scott A. Lery ,  Vladimir Parizhsky

IPC分类号： H04L7/027 ,  H04L7/033 ,  H04L7/04 ,  H04L7/00

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。

公开(公告)号：US5970089A

公开(公告)日：1999-10-19

申请号：US909997

申请日：1997-08-12

申请人： Carl H. Alelyunas ,  Scott A. Lery ,  Vladimir Parizhsky

发明人： Carl H. Alelyunas ,  Scott A. Lery ,  Vladimir Parizhsky

IPC分类号： H04L1/24 ,  H04L5/14 ,  H04L7/027 ,  H04L25/02 ,  H04L25/49 ,  H04B1/38 ,  H04B14/04

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。