Method and apparatus for achieving 180° phase invariant transmission in a PCM modem system
    1.
    发明授权
    Method and apparatus for achieving 180° phase invariant transmission in a PCM modem system 有权
    用于在PCM调制解调器系统中实现180°相位不变传输的方法和装置

    公开(公告)号:US06418170B1

    公开(公告)日:2002-07-09

    申请号:US09499173

    申请日:2000-02-07

    IPC分类号: H04B1406

    CPC分类号: H04L25/4927 H04B14/04

    摘要: In a PCM modem system in which equivalence classes are used to communicate information from a transmitter to a receiver, a method is provided to solve the problem of 180° phase reversals in the communications channel which result in a garbled transmission. This is accomplished by remapping the equivalence classes into a form that can be differentially encoded and decoded such that equivalence class identity is not lost during a phase reversal of the channel.

    摘要翻译: 在PCM调制解调器系统中,使用等价类来传送从发射机到接收机的信息,提供一种解决通信信道中180°相位反转问题的方法,导致乱码传输。 这是通过将等价类重新映射成可以进行差分编码和解码的形式来实现的,使得等效类标识在信道的相位反转期间不会丢失。

    System and method for adjusting PCM data frames for robbed bit signaling in a telephone network
    2.
    发明授权
    System and method for adjusting PCM data frames for robbed bit signaling in a telephone network 有权
    用于调整电话网络中的抢占位信令的PCM数据帧的系统和方法

    公开(公告)号:US06266376B1

    公开(公告)日:2001-07-24

    申请号:US09499088

    申请日:2000-02-04

    IPC分类号: H04B1404

    摘要: A system and method for shifting the relative phases of a PCM data frame and a network RBS frame by one or more symbols is disclosed. The method includes determining whether or not RBS is present. If RBS is present, the slots affected by RBS are identified. Next it is determined what data slots, if any, are affected by encoding. The PCM data frame is shifted so the RBS constraint and the encoding constraint do not coincide at any particular data slot. For one particular PCM upstream modulation scheme, the digital modem adjusts the relative phases of the data-mode frame and network RBS frame such that a minimum number of trellis-modified symbols fall on network RBS affected slots. This information is transmitted to an analog modem. The amount of shift can be conveyed to an analog modem in the same data sequence used to send upstream constellation sets and mapping parameters during an initial training sequence. The present invention improves the performance of any PCM modem that employs a data frame structure in which not all symbols are subject to the same constraints, for example, due to trellis coding.

    摘要翻译: 公开了一种用于将PCM数据帧和网络RBS帧的相对相位移位一个或多个符号的系统和方法。 该方法包括确定RBS是否存在。 如果存在RBS,则识别受RBS影响的时隙。 接下来,确定什么数据时隙(如果有的话)受到编码的影响。 PCM数据帧被移位,所以RBS约束和编码约束在任何特定的数据时隙不一致。 对于一个特定的PCM上行调制方案,数字调制解调器调整数据模式帧和网络RBS帧的相对相位,使得最少数量的网格修正符号落在网络RBS受影响的时隙上。 该信息被传送到模拟调制解调器。 移位量可以在初始训练序列中用于发送上游星座集和映射参数的相同数据序列中传送到模拟调制解调器。 本发明改进了采用数据帧结构的任何PCM调制解调器的性能,其中并不是所有的符号都受到相同的约束,例如由于网格编码。

    Method and apparatus for adjustment of the sampling phase in a PCM modem system using a dual-phase probing signal
    3.
    发明授权
    Method and apparatus for adjustment of the sampling phase in a PCM modem system using a dual-phase probing signal 有权
    使用双相探测信号调制PCM调制解调器系统中采样相位的方法和装置

    公开(公告)号:US06456651B1

    公开(公告)日:2002-09-24

    申请号:US09498822

    申请日:2000-02-04

    IPC分类号: H04B138

    摘要: In a PCM modem system, a method and apparatus for optimizing the fractional sampling phase offset in the upstream direction to maximize the upstream data rate utilizes a probing signal from the analog modem generated during startup and having at least two distinct phases of a pure tone, with the probing signal being detected at the digital modem where an optimum sampling phase value is calculated. From this calculated value, a signal representing the appropriate amount to delay the input data stream is transmitted back to the analog modem for adjustment of the fractional sampling phase so that the fractional sampling phase offset at the central office quantizer is optimized.

    摘要翻译: 在PCM调制解调器系统中,用于优化上游方向上的分数采样相位偏移以最大化上行数据速率的方法和装置利用来自在启动期间产生的模拟调制解调器的探测信号,并具有纯音的至少两个不同相位, 其中在数字调制解调器处检测到探测信号,其中计算出最佳采样相位值。 从该计算值,将表示用于延迟输入数据流的适当量的信号发送回模拟调制解调器以调整分数采样相位,使得在中心局量化器处的分数采样相位偏移被优化。

    PCM modem adaptation system utilizing a silence period
    4.
    发明授权
    PCM modem adaptation system utilizing a silence period 有权
    PCM调制解调器适应系统利用沉默期

    公开(公告)号:US06408021B1

    公开(公告)日:2002-06-18

    申请号:US09496754

    申请日:2000-02-03

    IPC分类号: H04B138

    摘要: In a full duplex PCM modem system, a method and apparatus is provided for robust measuring of the communications channel in which the digital modem's transmitter is silenced during generation of training signals by the analog modem, with the silencing of the digital modem's transmitter eliminating problems associated with echo during channel measurement at the digital modem. The above method thus eliminates echo during channel estimation and removes any dependencies on the performance of the echo canceller normally used.

    摘要翻译: 在全双工PCM调制解调器系统中,提供了一种用于对通信信道进行鲁棒测量的方法和装置,其中数字调制解调器的发射机在由模拟调制解调器产生训练信号期间被静音,数字调制解调器的发射机的消音消除了相关的问题 在数字调制解调器的通道测量期间具有回波。 因此,上述方法消除了信道估计期间的回波,并且消除了通常使用的回波消除器的性能的任何依赖性。

    Method and apparatus for the control of modem transmit power
    5.
    发明授权
    Method and apparatus for the control of modem transmit power 有权
    用于控制调制解调器发射功率的方法和装置

    公开(公告)号:US07085316B1

    公开(公告)日:2006-08-01

    申请号:US09499014

    申请日:2000-02-04

    IPC分类号: H04B1/38

    摘要: A method and apparatus is provided for controlling the transmit power of an analog modem when the transmit power level does not match the desired transmit power level, thus conforming to FCC regulations on transmit power and/or eliminating non-linearities associated with higher than required power levels and loss of signal-to-noise ratio and concomitant at loss of data rate if the transmit power levels are less than that desired. In one embodiment, the power level at the analog modem is sensed to ascertain if it is not at the desired transmit power level, with adjustment being provided by transmitting the desired change in the transmit power level to the digital modem, whereupon mapping parameters are redefined by adjusting the number of equivalence classes, thus to adjust transmit power at analog modem.

    摘要翻译: 提供了一种方法和装置,用于当发射功率电平与期望的发射功率电平不匹配时控制模拟调制解调器的发射功率,从而符合关于发射功率的FCC规定和/或消除与高于所需功率相关联的非线性 水平和信噪比的损失,如果发射功率水平低于所需的数据速率,则伴随数据速率的丢失。 在一个实施例中,感测模拟调制解调器处的功率电平以确定其是否不在期望的发射功率电平,通过将发射功率电平的期望变化发射到数字调制解调器来提供调整,由此重新定义映射参数 通过调整等价类的数量,从而调整模拟调制解调器的发射功率。

    System and method for sampling phase adjustment by an analog modem
    6.
    发明授权
    System and method for sampling phase adjustment by an analog modem 有权
    通过模拟调制解调器采样相位调整的系统和方法

    公开(公告)号:US06674794B1

    公开(公告)日:2004-01-06

    申请号:US09498328

    申请日:2000-02-04

    IPC分类号: H04B138

    CPC分类号: H04L25/4927

    摘要: A system and method for adjusting the phase of the analog signal produced by an analog modem connected to a digital modem over a telephone network. The digital portion of the telephone network is locked to the network clock, and the modems have no control over the sampling timing or rate as the analog signal is sampled and quantized by a codec. If the analog signal is shifted in phase relative to the network clock, then the codec may be sampling at unresolvable points on the analog signal, thereby causing errors and a decrease in the usable bandwidth for transmitting data. The analog modem symbol frequency is locked to the clock of the digital network using loop-back timing. A phase estimate is computed using the quantized samples of a known reference signal. Next, a “phase offset” is calculated by comparing the phase estimate to an optimum phase value. Then the digital modem sends the calculated phase offset information to the analog modem. The analog modem then delays its transmitted signal by the phase offset. After the phase of the analog modem's transmitter is adjusted, the analog signal reaches the codec at the phase desired by the digital modem.

    摘要翻译: 一种用于调整由通过电话网络连接到数字调制解调器的模拟调制解调器产生的模拟信号的相位的系统和方法。 电话网络的数字部分被锁定到网络时钟,并且当模拟信号被编解码器采样和量化时,调制解调器不能控制采样定时或速率。 如果模拟信号相对于网络时钟相位移位,则编解码器可能在模拟信号上的不可解析点进行采样,从而导致发送数据的可用带宽的错误和降低。 模拟调制解调器符号频率使用环回定时锁定到数字网络的时钟。 使用已知参考信号的量化样本来计算相位估计。 接下来,通过将相位估计与最佳相位值进行比较来计算“相位偏移”。 然后数字调制解调器将计算的相位偏移信息发送到模拟调制解调器。 模拟调制解调器然后通过相位偏移来延迟其发送的信号。 模拟调制解调器发射机的相位调整后,模拟信号以数字调制解调器所需的相位达到编解码器。

    Data mode signaling system for PCM modem adaptation
    7.
    发明授权
    Data mode signaling system for PCM modem adaptation 有权
    用于PCM调制解调器适配的数据模式信令系统

    公开(公告)号:US07061973B1

    公开(公告)日:2006-06-13

    申请号:US09497328

    申请日:2000-02-03

    IPC分类号: H04B1/38 H04L5/16

    摘要: In a full duplex PCM modem system having an analog and digital modem, a method and apparatus is provided for on-the-fly reconfiguring of analog or digital modem transmitter parameters without switching back to a retrain or startup mode. In one embodiment, the transmitter parameters for the analog modem are modified to take into account channel impairments, in which modified precompensation parameters are sent from the digital modem to the analog modem without switching out of the data mode. In another embodiment, transmit power levels sensed at the analog modem which are non-optimal are adjusted by new parameters sent from the digital modem without having to switch back to the startup mode. In a further embodiment, transmitter parameters in the digital modem are reconfigured to provide more an increased downstream data rate from the digital modem upon sensing improvement in the quality of the downstream channel without switching to the startup mode.

    摘要翻译: 在具有模拟和数字调制解调器的全双工PCM调制解调器系统中,提供了一种方法和装置,用于即时重新配置模拟或数字调制解调器发射机参数,而不需要切换到重新训练或启动模式。 在一个实施例中,修改模拟调制解调器的发射机参数以考虑信道损伤,其中修改的预补偿参数从数字调制解调器发送到模拟调制解调器而不切换数据模式。 在另一个实施例中,在模拟调制解调器处检测到的非最佳的发射功率电平是通过从数字调制解调器发送的新参数进行调整而不必切换回启动模式。 在另一实施例中,重新配置数字调制解调器中的发射机参数,以便在感测到下游信道的质量的改善而不切换到启动模式时,从数字调制解调器提供更多的增加的下行数据速率。

    Method and apparatus for dynamically allocating resources in a communication system
    8.
    发明授权
    Method and apparatus for dynamically allocating resources in a communication system 有权
    用于在通信系统中动态分配资源的方法和装置

    公开(公告)号:US06934254B2

    公开(公告)日:2005-08-23

    申请号:US09764959

    申请日:2001-01-18

    IPC分类号: H04L29/06 H04L29/08 H04L12/26

    CPC分类号: H04L29/06 H04L69/32

    摘要: A method and apparatus is provided that dynamically allocates processor resources to data transfer-related operations, minimizing the processor resources used for data transfer-related operations and maximizing the processor resources available for other applications. The apparatus comprises a communication device (104), comprising a processing unit (204) and a complexity controller (206), which communication device (104) is capable of executing multiple data transfer-related operations and is highly configurable. The complexity controller (206) monitors a condition of a communication channel (102) and determines the best configuration of communication device (104) in regard to processor resource utilization to meet a given Quality of Service requirement for the condition of channel (102) and to maximize the processor resources available for other applications, such as data terminal equipment user applications (108) or signal processing by other communication devices using the same host processor.

    摘要翻译: 提供了一种方法和装置,其将处理器资源动态地分配给数据传输相关操作,最小化用于数据传输相关操作的处理器资源并最大化可用于其他应用的处理器资源。 该设备包括通信设备(104),其包括处理单元(204)和复杂度控制器(206),该通信设备(104)能够执行多个与数据传输相关的操作并且是高度可配置的。 复杂性控制器(206)监视通信信道(102)的状况,并且确定通信设备(104)关于处理器资源利用的最佳配置,以满足对于信道(102)的条件的给定服务质量要求,以及 以最大限度地利用可用于诸如数据终端设备用户应用程序(108)的其他应用程序的处理器资源或使用相同主机处理器的其他通信设备的信号处理。