-
公开(公告)号：US06301296B1
公开(公告)日：2001-10-09
申请号：US09592539
申请日：2000-06-12
IPC分类号： H04B138
CPC分类号： H04L25/4927 , H04L5/1453
摘要： A Digital Impairment Learning sequence which is designed for providing reliable estimate of digital impairments such as PAD, RBS, and CODEC type in the presence of analog impairments such as IMD, noise and changing line conditions. This estimate is used to derive optimum transmit symbol constellations for a modem connected digitally to a trunk so as to maximize its data transmission rate.
摘要翻译： 数字损伤学习序列，其设计用于在诸如IMD，噪声和变化线路条件的模拟损伤的存在下提供数字损伤的可靠估计，例如PAD，RBS和CODEC类型。 该估计用于为数字地连接到中继线的调制解调器获得最佳发射符号星座，以使其数据传输速率最大化。
-
公开(公告)号：US07424051B2
公开(公告)日：2008-09-09
申请号：US10805102
申请日：2004-03-19
CPC分类号： H04L25/4927 , H04L5/1453
摘要： A Digital Impairment detection scheme which is designed for providing reliable estimate of digital impairments such as PAD, and CODEC type in the presence of digital impairments such as Robbed Bit Signalling and non G.711 complaint network CODECs and analog impairments such as IMD, noise and changing line conditions. This estimate is used to derive optimum transmit symbol constellations for a modem connected digitally to a trunk so as to maximize its data transmission rate.
摘要翻译： 数字损伤检测方案，其设计用于在存在数字损伤（例如Robbed Bit Signaling）和非G.711投诉网络CODEC以及模拟损伤（例如IMD，噪声和噪声）的情况下提供诸如PAD和CODEC类型的数字损伤的可靠估计， 改变线条件。 该估计用于为数字地连接到中继线的调制解调器获得最佳发射符号星座，以使其数据传输速率最大化。
-
公开(公告)号：US07366470B1
公开(公告)日：2008-04-29
申请号：US09598680
申请日：2000-06-21
CPC分类号： H04L25/4927
摘要： An Inter-modulation distortion measurement and correction method which could be applied over a communication channel that is a combination of either or both analog and digital channels. This method is applicable for a communication system between a modem pair.
摘要翻译： 可以应用于作为模拟和数字信道之一或两者的组合的通信信道的互调失真测量和校正方法。 该方法适用于调制解调器对之间的通信系统。
-
公开(公告)号：US06724814B1
公开(公告)日：2004-04-20
申请号：US09598934
申请日：2000-06-22
IPC分类号： H04B138
CPC分类号： H04L25/4927 , H04L5/1453
摘要： A Digital Impairment detection scheme which is designed for providing reliable estimate of digital impairments such as PAD, and CODEC type in the presence of digital impairments such as Robbed Bit Signalling and non G.711 complaint network CODECs and analog impairments such as IMD, noise and changing line conditions. This estimate is used to derive optimum transmit symbol constellations for a modem connected digitally to a trunk so as to maximize its data transmission rate.
摘要翻译： 数字损伤检测方案，其设计用于在存在数字损伤（例如Robbed Bit Signaling）和非G.711投诉网络CODEC以及模拟损伤（例如IMD，噪声和噪声）的情况下提供诸如PAD和CODEC类型的数字损伤的可靠估计， 改变线条件。 该估计用于为数字地连接到中继线的调制解调器获得最佳发射符号星座，以使其数据传输速率最大化。
-
公开(公告)号：US06721357B1
公开(公告)日：2004-04-13
申请号：US09572860
申请日：2000-05-18
IPC分类号： H04L516
CPC分类号： H04L25/4927
摘要： A method of generating a data constellation at a client modem is provided whereby an optimum distance between data constellation data points may be calculated for a predetermined, acceptable error probability. An iterative process may be carried out using proposed data constellations which may be used to provide factors for calculating corrected constellations. Once a constellation is generated to satisfy the required probability of error, the constellation may be re-evaluated using CRC errors and detected noise variance at the client modem. Based upon predetermined levels of noise variance and CRC error, the constellation may be regenerated to operate at either a higher bit rate or a lower bit rate.
摘要翻译： 提供了一种在客户端调制解调器处生成数据星座的方法，由此可以针对预定的可接受的错误概率来计算数据星座数据点之间的最佳距离。 可以使用可用于提供用于计算校正星座的因子的提出的数据星座来执行迭代过程。 一旦产生星座以满足所需的误差概率，则可以使用客户端调制解调器处的CRC错误和检测到的噪声方差来重新评估星座图。 基于预定水平的噪声方差和CRC误差，可以重新生成星座以在较高比特率或较低比特率下工作。
-
公开(公告)号：US07339996B2
公开(公告)日：2008-03-04
申请号：US10804914
申请日：2004-03-19
申请人： Sigang Qiu , Vedavalli Gomatam Krishnan , Bo Zhang
发明人： Sigang Qiu , Vedavalli Gomatam Krishnan , Bo Zhang
CPC分类号： H04L5/1453 , H04L25/4927
摘要： A technique is proposed to accurately estimate the Network CODEC levels for each PCM code a server modem generates. These levels are affected by the digital impairments such as Digital attenuation PAD in the trunk, the Robbed Bit Signaling, the type of CODEC (μ-law or a-law—or non standard), and by analog impairments such as loop distortion, noise, inter-modulation distortion, echo. At client modem equalizer output good estimates for these levels are derived. By detecting RBS pattern of the trunk, and using averages of decode levels of similar RBS slots, more accurate data points are obtained. By further replacing these levels with the closest CODEC receive levels, good accuracy is obtained. Non-monotonic points are detected and eliminated. An upper limit is set for constellation points to avoid saturation of the receiver. IMD correction is applied to the decode levels. Ideal points that are not signaled, are added if possible. When PAD-detection or Codec detection fails, PAD is set to 0 dB and the constellation is based on originally received and averaged data points. Techniques are presented for V.90 type modem constellation generation.
摘要翻译： 提出了一种技术来准确地估计服务器调制解调器生成的每个PCM码的网络CODEC电平。 这些电平受到数字损伤的影响，例如中继线中的数字衰减PAD，Robbed位信令，CODEC的类型（mu律或a律或非法），以及模拟损伤，如环路失真，噪声 ，互调失真，回波。 在客户端调制解调器均衡器输出这些级别的良好估计值得出。 通过检测中继线的RBS模式，并使用类似RBS时隙的解码电平的平均值，可获得更准确的数据点。 通过以最接近的CODEC接收电平进一步取代这些电平，获得良好的精度。 检测和消除非单调点。 设置星座点的上限以避免接收器饱和。 解码级别应用IMD校正。 没有发出信号的理想点，如果可能的话添加。 当PAD检测或编解码检测失败时，PAD设置为0 dB，星座基于原始接收和平均数据点。 提出了V.90型调制解调器星座生成技术。
-
公开(公告)号：US06721363B1
公开(公告)日：2004-04-13
申请号：US09579529
申请日：2000-05-26
申请人： Sigang Qiu , Vedavalli Gomatam Krishnan , Bo Zhang
发明人： Sigang Qiu , Vedavalli Gomatam Krishnan , Bo Zhang
IPC分类号： H04B1404
CPC分类号： H04L5/1453 , H04L25/4927
摘要： A technique is proposed to accurately estimate the Network CODEC levels for each PCM code a server modem generates. These levels are affected by the digital impairments such as Digital attenuation PAD in the trunk, the Robbed Bit Signaling, the type of CODEC (&mgr;-law or a-law—or non standard), and by analog impairments such as loop distortion, noise, inter-modulation distortion, echo. At client modem equalizer output good estimates for these levels are derived. By detecting RBS pattern of the trunk, and using averages of decode levels of similar RBS slots, more accurate data points are obtained. By further replacing these levels with the closest CODEC receive levels, good accuracy is obtained. Non-monotonic points are detected and eliminated. An upper limit is set for constellation points to avoid saturation of the receiver. IMD correction is applied to the decode levels Ideal points that are not signaled, are added if possible . When PAD-detection or Codec detection fails, PAD is set to 0 dB and the constellation is based on originally received and averaged data points. Techniques are presented for V.90 type modem constellation generation.
摘要翻译： 提出了一种技术来准确地估计服务器调制解调器生成的每个PCM码的网络CODEC电平。 这些电平受到数字损伤的影响，例如中继线中的数字衰减PAD，Robbed位信令，CODEC的类型（mu律或a律或非法），以及模拟损伤，如环路失真，噪声 ，互调失真，回波。 在客户端调制解调器均衡器输出这些级别的良好估计值得出。 通过检测中继线的RBS模式，并使用类似RBS时隙的解码电平的平均值，可获得更准确的数据点。 通过以最接近的CODEC接收电平进一步取代这些电平，获得良好的精度。 检测和消除非单调点。 设置星座点的上限以避免接收器饱和。 IMD校正应用于解码级别如果可能，将添加未发出信号的理想点。 当PAD检测或编解码检测失败时，PAD设置为0 dB，星座基于原始接收和平均数据点。 提出了V.90型调制解调器星座生成技术。
-
-
-
-
-
-
搜索结果
7 条记录 (耗时 0.018 秒)
