METHOD AND APPARATUS FOR HIGH-SPEED DATA TRANSFER EMPLOYING SELF-SYNCHRONIZING QUADRATURE AMPLITUDE MODULATION

    公开(公告)号:US20170237598A1

    公开(公告)日:2017-08-17

    申请号:US15425785

    申请日:2017-02-06

    Applicant: SeeScan Inc.

    CPC classification number: H04L27/362 H04L27/3455 H04L27/3818

    Abstract: Methods and apparatus for wired communications are disclosed. A method for transmitting a data stream through a wired communications channel includes encoding the data stream to produce a first baseband modulating signal I(t) and a second baseband modulating signal Q(t) whose amplitudes together represent a time series of complex symbols (I, Q) each selected from a two-dimensional (2-D) constellation of symbols distributed on the phase plane about the origin such that at least one of the baseband modulating signals has a substantially non-zero mean amplitude, modulating the baseband signals I(t) and Q(t) to produce a modulated signal, wherein the I(t) and Q(t) components of the modulated signals are generally fixed in quadrature, and providing the modulated signal to a wired communications channel.

    Method and apparatus for high-speed data transfer employing self-synchronizing quadrature amplitude modulation
    47.
    发明授权
    Method and apparatus for high-speed data transfer employing self-synchronizing quadrature amplitude modulation 有权
    采用自同步正交幅度调制的高速数据传输方法和装置

    公开(公告)号:US09571326B2

    公开(公告)日:2017-02-14

    申请号:US12715684

    申请日:2010-03-02

    CPC classification number: H04L27/362 H04L27/3455 H04L27/3818

    Abstract: A Quadrature Amplitude Modulation (QAM) method and apparatus including a QAM transmit modulator with at least one unbalanced mixer, which creates an asymmetric two-dimensional (2-D) QAM symbol constellation. The asymmetrical symbol constellation provides baseband symbol clock signal leakage sufficient to facilitate quick and simple baseband symbol clock recovery and signal channel compensation at the QAM receiver without significantly degrading the system bit-error rate (BER). While slightly degrading static BER, overall system performance is improved when considering baseband symbol clock recovery and received signal compensation for an imperfect signal channel. This allows QAM to be deployed in systems where QAM is otherwise prohibitively expensive and improves overall system performance for any existing QAM system application without additional bandwidth, cost or complexity.

    Abstract translation: 一种正交幅度调制(QAM)方法和装置,其包括具有至少一个不平衡混频器的QAM发射调制器,其产生不对称二维(2-D)QAM符号星座。 不对称符号星座提供足够的基带符号时钟信号泄漏,以便于在QAM接收机上快速简单的基带符号时钟恢复和信号信道补偿,而不会显着降低系统误码率(BER)。 在考虑基带符号时钟恢复和不完美信号通道的接收信号补偿的同时,静态BER略有降低,整体系统性能得到改善。 这样就可以将QAM部署在其他QAM价格昂贵的系统中,并且可以提高任何现有QAM系统应用的整体系统性能,而无需额外的带宽,成本或复杂性。

    Pipe mapping system and methods
    50.
    发明授权
    Pipe mapping system and methods 有权
    管道测绘系统及方法

    公开(公告)号:US09041794B1

    公开(公告)日:2015-05-26

    申请号:US14034293

    申请日:2013-09-23

    Abstract: In one embodiment, a pipe inspection system includes a push-cable, a sonde coupled to the push-cable, a locator configured to receive signals from the sonde and generate positional information associated with the pipe based at least in part on the received sonde signals, a processing element configured to generate mapping information from the position information, and a non-transitory memory for storing the generated mapping information.

    Abstract translation: 在一个实施例中,管道检查系统包括推送电缆,耦合到推送电缆的探空器,定位器,其被配置为从主探头接收信号并且至少部分地基于所接收的探测器信号产生与管道相关联的位置信息 被配置为从所述位置信息生成映射信息的处理元件以及用于存储所生成的映射信息的非暂时性存储器。

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