System and method for improving bit-loading in discrete multitone-based digital subscriber line modems
    1.
    发明授权
    System and method for improving bit-loading in discrete multitone-based digital subscriber line modems 有权
    用于改进离散多音频数字用户线调制解调器中的位加载的系统和方法

    公开(公告)号:US07646804B2

    公开(公告)日:2010-01-12

    申请号:US11028177

    申请日:2005-01-03

    申请人: Cory S. Modlin

    发明人: Cory S. Modlin

    IPC分类号: H04B1/38

    CPC分类号: H04L27/2608

    摘要: A system and method for improving bit-loading in discrete multitone (DMT)-based digital subscriber line (DSL) modems. In one embodiment, the system includes: (1) a model generator configured to generate a model containing a calculated total bit loading for an assumed gross coding gain and estimated total bit loadings for a other plurality of assumed gross coding gains and (2) a bit loader associated with the model generator and configured to load bits in accordance with the model.

    摘要翻译: 一种用于改进基于离散多媒体(DMT)的数字用户线(DSL)调制解调器中的比特加载的系统和方法。 在一个实施例中,系统包括:(1)模型发生器,其被配置为生成包含用于假定的总体编码增益的计算的总比特负载的模型,以及用于其他多个假定的总编码增益的估计的总比特加载,以及(2) 与模型生成器相关联的位加载器,并配置为根据模型加载位。

    Error free dynamic rate change in a digital subscriber line DSL with constant delay
    2.
    发明授权
    Error free dynamic rate change in a digital subscriber line DSL with constant delay 有权
    具有恒定延迟的数字用户线DSL中的无错误动态速率变化

    公开(公告)号:US07457993B2

    公开(公告)日:2008-11-25

    申请号:US11274283

    申请日:2005-11-16

    申请人: Cory S. Modlin

    发明人: Cory S. Modlin

    IPC分类号: G06F11/00 H03M13/00

    摘要: A method for changing the data rate over an interleaved latency path overcomes shortfalls of the ADSL2 seamless rate adaptation (SRA) and dynamic rate repartitioning (DRR). The interleaver depth is allowed to change during either a rate charge or rate repartioning so that the interleaver delay is constant before and after the change. The transmitter pauses its transmission for a time approximately equal to the delay of the interleaver so that there are approximately no errors introduced at the receiver.

    摘要翻译: 用于在交错等待时间路径上改变数据速率的方法克服了ADSL2无缝速率适配(SRA)和动态速率重新分配(DRR)的不足。 允许交织器深度在速率充电或速率重新分配期间改变,使得交织器延迟在变化之前和之后是恒定的。 发射机将其传输暂停大约等于交织器的延迟的时间,使得在接收机处几乎没有引入错误。

    Orthogonal frequency division multiplexing access (OFDMA) ranging
    3.
    发明授权
    Orthogonal frequency division multiplexing access (OFDMA) ranging 有权
    正交频分复用接入(OFDMA)范围

    公开(公告)号:US07675888B2

    公开(公告)日:2010-03-09

    申请号:US11531586

    申请日:2006-09-13

    CPC分类号: H04L5/023 H04J3/0682

    摘要: A method for Orthogonal Frequency Division Multiplexing Access (OFDMA) ranging is provided. The method includes receiving a signal having OFDMA symbols. An FFT is performed on this signal. Matching ranging codes are found. The power for a given hypothesized ranging code is determined and compared to a power threshold to determine if the code was transmitted. The timing offset and power are reported as the result of ranging.

    摘要翻译: 提供了一种用于正交频分复用接入(OFDMA)测距的方法。 该方法包括接收具有OFDMA符号的信号。 对该信号执行FFT。 找到匹配的测距代码。 确定给定假设测距码的功率并将其与功率阈值进行比较,以确定代码是否被发送。 定时偏移和功率作为测距结果报告。

    Method and system for accomodating a wide range of user data rates in a multicarrier data transmission system
    4.
    发明授权
    Method and system for accomodating a wide range of user data rates in a multicarrier data transmission system 有权
    用于在多载波数据传输系统中适应宽范围的用户数据速率的方法和系统

    公开(公告)号:US06480475B1

    公开(公告)日:2002-11-12

    申请号:US09152917

    申请日:1998-09-14

    IPC分类号: H04L514

    摘要: Improved approaches to provide flexibility in setting user data rates and managing delay in data transmission systems using a superframe structure and Time Division Duplexing (TDD) are disclosed. These improved approaches operate to provide intelligent insertion of dummy words (bits or bites) into a data stream to be transmitted. By inserting the dummy words, the invention is able to render codewords, symbols and superframes independent from user data rates. As a result, a wide range of user data rates are available in data transmission systems using a superframe and TDD.

    摘要翻译: 公开了改进的方法来提供设置用户数据速率和管理使用超帧结构和时分双工(TDD)的数据传输系统中的延迟的灵活性。 这些改进的方法操作来提供将虚拟字(比特或比特)智能插入到要发送的数据流中。 通过插入虚拟字,本发明能够提供独立于用户数据速率的码字,符号和超帧。 因此,在使用超帧和TDD的数据传输系统中可以获得广泛的用户数据速率。