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公开(公告)号：US07436849B1
公开(公告)日：2008-10-14
申请号：US10211820
申请日：2002-08-02
申请人： Daniel Amrany , William E. Keasler
发明人： Daniel Amrany , William E. Keasler
CPC分类号： H04M11/062 , H04L12/2856 , H04L12/2889
摘要： System and method for partitioning a DSLAM network. In this regard, one such network can be broadly summarized by a representative communication system comprising a digital subscriber line access multiplexer (DSLAM) that is communicatively coupled on its line-side to a high-speed digital link. The DSLAM is communicatively coupled through the high-speed digital link with the trunk side of a remote line access unit (RLAU). The RLAU is communicatively coupled on its line-side to a first digital subscriber line (DSL).
摘要翻译： 用于划分DSLAM网络的系统和方法。 在这方面，一个这样的网络可以由代表性的通信系统广泛地概括，包括在其线路侧通信耦合到高速数字链路的数字用户线路接入复用器（DSLAM）。 DSLAM通过高速数字链路与远程线路接入单元（RLAU）的中继线进行通信耦合。 RLAU在其线路侧通信耦合到第一数字用户线路（DSL）。
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公开(公告)号：US4206320A
公开(公告)日：1980-06-03
申请号：US934749
申请日：1978-08-21
CPC分类号： H04L27/2602 , H04L27/2627 , H04L27/2649 , H04L27/2657 , H04L27/3836
摘要： A modem capable of achieving essentially 9600 bit per second information transfer rate through the switched telephone network. The high bit rate is achieved notwithstanding the variations in the characteristics of the switched telephone network by phase and amplitude modulating a plurality of sub-carriers at a relatively low baud rate. Correlation detection is employed at the receiver to extract or demodulate the information contained in the various sub-carriers. To allow correlation detection with orthogonal signals, each of the sub-carriers is harmonically related to a fundamental which fundamental is, however, slightly higher than the baud rate. This allows the receiver to delay correlation for a "gap" time, which reduces the effect of transients produced by modulation and also provides greater tolerance to inter-symbol distortion. Since the fundamental of all the sub-carriers is higher than the baud rate, the receiver "sees" orthogonal signals during the integration or correlation time which is maintained as the period of the fundamental. In addition to the information sub-carriers, a pair of unmodulated sub-carriers are also transmitted to enable the receiver to maintain the correlation interval in proper synchronization with the transmitter, and to correct for phase distortion and frequency offset.
摘要翻译： 调制解调器能够通过交换电话网络实现基本上每秒9600比特的信息传输速率。 尽管通过以相对较低的波特率相位和幅度调制多个子载波来改变交换电话网络的特性，但是实现了高比特率。 在接收机采用相关检测来提取或解调包含在各种子载波中的信息。 为了允许与正交信号进行相关检测，每个子载波与基波谐波相关，然而基波稍微高于波特率。 这允许接收机延迟“间隙”时间的相关性，这降低了由调制产生的瞬变的影响，并且还提供对符号间失真的更大容限。 由于所有子载波的基波高于波特率，所以接收机在整合或相关时间期间“看到”正交信号，该信号被保持为基波周期。 除了信息子载波之外，还发送一对未调制的子载波以使得接收机能够将相关间隔保持与发射机的适当同步，并且校正相位失真和频率偏移。
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公开(公告)号：US5590121A
公开(公告)日：1996-12-31
申请号：US413643
申请日：1995-03-30
CPC分类号： H03H21/0012
摘要： A finite impulse response (FIR) filter characterization is performed using a modified least means squares approach that updates values of FIR filter taps as groups of taps, periodically. For the taps updated for a current input signal sample, future convolution values for future input signal samples are computed and also a partial estimate of the signal response is computed. The expected response is then computed by summing the partial estimate signal response and other partial estimates of the signal response which are computed from future convolution, missed tap update convolution and normalizes error signal values which have been previously computed at past input signal samples and stored in memory.
摘要翻译： 使用经修改的最小均方法进行有限脉冲响应（FIR）滤波器表征，周期性地将FIR滤波器抽头的值更新为抽头组。 对于针对当前输入信号样本更新的抽头，计算未来输入信号样本的未来卷积值，并且还计算信号响应的部分估计。 然后通过将部分估计信号响应和信号响应的其它部分估计相加来计算预期响应，该估计信号响应是从未来卷积计算得到的，错过抽头更新卷积，并归一化先前在过去的输入信号样本处计算并存储在其中的误差信号值 记忆。
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4.发明授权System and method for increasing payload capacity by clustering unloaded bins in a data transmission system 有权用于通过在数据传输系统中聚集卸载箱来增加有效载荷容量的系统和方法公开(公告)号：US07068592B1
公开(公告)日：2006-06-27
申请号：US09997662
申请日：2001-11-29
IPC分类号： H04J11/00
CPC分类号： H04L27/2608
摘要： A system and method for increasing payload in a data transmission system. In architecture, the system comprises a modulation device configured to modulate data bins to produce bin-clusters, a mechanism to load the bin-clusters with data, a transmitter configured to transmit the loaded bin-clusters, a receiver configured to receive the transmitted bin-clusters, and a demodulation device configured to extract data from the received bin-clusters.The method steps comprise the steps of modulating data bins to produce bin-clusters, loading the bin-clusters with data, transmitting the loaded bin-clusters, receiving the transmitted bin-clusters, and extracting data from the received bin-clusters.
摘要翻译： 一种用于增加数据传输系统中的有效载荷的系统和方法。 在架构中，该系统包括被配置为调制数据箱以产生二进制群集的调制装置，用数据加载二进制群集的机制，被配置为发送加载的二进制群集的发射机，被配置为接收所发送的小区的接收机 集群和解调装置，被配置为从接收到的二进制群集中提取数据。 所述方法步骤包括以下步骤：调制数据仓以产生二维群集，使用数据加载二维群集，发送加载的垃圾群集，接收所发送的垃圾群集，以及从接收到的垃圾群提取数据。
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5.发明授权Local loop test arrangement in an echo canceller based full duplex modem 失效基于回波消除器的全双工调制解调器中的本地环路测试布置
公开(公告)号：US4825459A
公开(公告)日：1989-04-25
申请号：US814673
申请日：1985-12-30
摘要： In accordance with the present invention, local loop testing in an echo canceller based modem is provided in a manner in which proper operation of both the receiver and echo canceller can be assessed simultaneously. Specifically, the modem includes means for generating data and interfering symbol sequences and for applying the interfering sequence to both the echo canceller and the modem transmitter, while applying the data sequence only to either the transmitter or the echo canceller. During closed loop testing, the modem connection to the transmission line is opened, and a portion of the output of the modem transmitter is applied to the modem receiver via a leakage path through the hybrid. The received symbol is subtracted from the echo canceller output, resulting in application to the receiver of only a version of the data symbol sequence. Advanced knowledge of the characteristics of the data symbol sequence allows proper receiver operation to be verified.
摘要翻译： 根据本发明，以可以同时评估接收机和回波消除器两者的适当操作的方式提供基于回波消除器的调制解调器中的本地环路测试。 具体地，调制解调器包括用于生成数据和干扰符号序列并用于将干扰序列应用于回波消除器和调制解调器发送器的装置，同时仅将数据序列应用于发射器或回波消除器。 在闭环测试期间，与传输线路的调制解调器连接打开，并且调制解调器发射机的输出的一部分经由混合器的泄漏路径被应用于调制解调器接收器。 从回波消除器输出中减去接收到的符号，导致只向数据符号序列的版本应用于接收器。 对数据符号序列特征的高级知识允许验证适当的接收机操作。
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