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    Controlling false packet acceptance
    1.
    发明授权
    Controlling false packet acceptance 有权

    公开(公告)号：US10256944B1

    公开(公告)日：2019-04-09

    申请号：US15132900

    申请日：2016-04-19

    Applicant: Marvell International Ltd.

    Inventor： Junqing Sun ,  Venugopal Balasubramonian

    IPC: H04L1/00 ,  H03M13/05 ,  H03M13/00

    Abstract: A device includes a network interface that includes a physical coding sublayer (PCS) unit. The PCS unit receives an Ethernet packet. The PCS unit encode the Ethernet packet into a transmission frame that includes a first set of bit fields corresponding to contents of the Ethernet packet and a second set of bit fields corresponding to control information for the encoding. The PCS unit computes a validity value of the transmission frame, wherein the validity value is based on the first set of bit fields included in the transmission frame. The PCS unit inserts the validity value of the transmission frame into one or more idle bit fields in the second set of bit fields included in the transmission frame. The PCS unit processes the transmission frame for sending to a receiving device over a physical medium.

    Interference mitigation in single twisted-pair communications
    2.
    发明授权
    Interference mitigation in single twisted-pair communications 有权

    公开(公告)号：US10044406B1

    公开(公告)日：2018-08-07

    申请号：US15825937

    申请日：2017-11-29

    Applicant: Marvell International LTD.

    Inventor： Shaoan Dai ,  Kok-Wui Cheong ,  Zhenzhong Gu ,  Junqing Sun ,  Meng Zeng ,  Xing Wu

    IPC: H04B3/04 ,  H04B3/23 ,  H04B17/336 ,  H04L25/03 ,  H04L25/08

    Abstract: A transceiver to communicate in a vehicle via a single twisted-pair Ethernet cable includes a transmitter and a receiver, an analog front end, an equalizer, and a controller. The transmitter transmits signals via the single twisted-pair Ethernet cable. The receiver receives signals via the single twisted-pair Ethernet cable. The analog front end receives a first signal received by the transceiver via the single twisted-pair Ethernet cable and outputs a second signal. The equalizer includes a notch filter to cancel electromagnetic interference from the second signal. The controller makes a frequency response of the equalizer independent of the electromagnetic interference by controlling tap values of the notch filter. The controller controls gain of one or more of the analog front end and the equalizer based on the frequency response of the equalizer.

    Signal detection and power measurement with multi-band filter to mitigate narrowband interference
    4.
    发明授权
    Signal detection and power measurement with multi-band filter to mitigate narrowband interference 有权

    公开(公告)号：US10090870B1

    公开(公告)日：2018-10-02

    申请号：US15943275

    申请日：2018-04-02

    Applicant: Marvell International Ltd.

    Inventor： Shaoan Dai ,  Kok-Wui Cheong ,  Zhenzhong Gu ,  Junqing Sun

    IPC: H04L27/00 ,  H04L5/00 ,  H04B1/10 ,  H04B3/23 ,  H04B17/327 ,  H04B1/08

    Abstract: Various aspects of this disclosure describe detecting a signal and measuring power with a multi-band filter. Examples include a signal detection and power measurement module in a receiver capable of detecting a training signal and calculating a reliable power measurement in the presence of narrowband interference. A received signal is filtered by a multi-band filter comprising a plurality of sub-band filters. For instance, sub-band filters may be bandpass filters with non-overlapping pass-bands. A training signal is detected by comparing powers of each of the outputs of the sub-band filters to a plurality of thresholds. For example, each sub-band may be assigned a different threshold value. Responsive to detecting a training signal, a power measurement is determined from at least one sub-band filter output. A gain is set based on the determined power measurement, and applied in the receiver.

    Method and apparatus for analyzing features or characteristics of a cable in a network
    5.
    发明授权
    Method and apparatus for analyzing features or characteristics of a cable in a network 有权

    公开(公告)号：US09696361B1

    公开(公告)日：2017-07-04

    申请号：US14566756

    申请日：2014-12-11

    Applicant: MARVELL INTERNATIONAL LTD.

    Inventor： Junqing Sun ,  Danjin Wu ,  Hung Nguyen

    IPC: G01R31/02 ,  G01R27/28 ,  G01N22/00

    CPC classification number: G01N22/00 ,  G01R27/28 ,  G01R31/11

    Abstract: Systems, methods, and other embodiments associated with testing a cable are described. According to one embodiment, an integrated circuit device includes a transmitter, a receiver, cable tester logic and a cable test control logic. The transmitter is configured to transmit signals to a cable. The receiver is configured to receive signals from the cable. The cable tester logic includes an echo tester configured to identify peaks corresponding to echo canceller coefficients that model an impulse response of reflected signals received by the receiver and a power-based cable tester configured to determine a power-based cable length based on an attenuation of a signal received from the link partner. The cable test control logic is configured to selectively activate one or both of the echo tester and the power-based tester and to determine a cable length based, at least in part, on the power-based cable length and the identified peaks.

    Method and apparatus for signal detection and baseline wander cancellation
    8.
    发明授权
    Method and apparatus for signal detection and baseline wander cancellation 有权
    用于信号检测和基线漂移消除的方法和装置

    公开(公告)号：US09485120B1

    公开(公告)日：2016-11-01

    申请号：US14834718

    申请日：2015-08-25

    Applicant: MARVELL INTERNATIONAL LTD.

    Inventor： Junqing Sun

    IPC: H03H7/30 ,  H03K5/159 ,  H04L27/01 ,  H04L25/03 ,  H04L12/26 ,  H04L25/06

    CPC classification number: H04L25/03057 ,  H04B3/143 ,  H04B3/144 ,  H04L25/06

    Abstract: Apparatus, methods, and other embodiments associated with reliably determining signal loss over a data communication channel have been described. According to one embodiment, a method includes receiving input signals at an input of a serializer/deserializer device and equalizing the input signals to form equalized signals which compensate for frequency response distortion. The method also includes analyzing the equalized signals to determine whether peak amplitudes of the equalized signals are within a range of amplitudes defined by two threshold values. Furthermore, the method includes analyzing the equalized signals to determine whether logic levels of the equalized signals correspond to a sequence of a same logic level. The method further includes generating a signal absent indicator when the peak amplitudes of the equalized signals are within the range, or when the logic levels of the equalized signals correspond to the sequence of the same logic level.

    Abstract translation: 已经描述了与可靠地确定数据通信信道上的信号丢失相关联的装置，方法和其它实施例。 根据一个实施例，一种方法包括在串行器/解串器装置的输入处接收输入信号，并均衡输入信号以形成补偿频率响应失真的均衡信号。 该方法还包括分析均衡信号以确定均衡信号的峰值幅度是否在由两个阈值定义的幅度的范围内。 此外，该方法包括分析均衡信号以确定均衡信号的逻辑电平是否对应于相同逻辑电平的序列。 该方法还包括当均衡信号的峰值幅度在该范围内时，或当均衡信号的逻辑电平对应于相同逻辑电平的序列时，产生无信号指示符。

    Decision feedback equalizer (DFE) utilizing error propagation information
    9.
    发明授权
    Decision feedback equalizer (DFE) utilizing error propagation information 有权
    判决反馈均衡器（DFE）利用误差传播信息

    公开(公告)号：US09363111B1

    公开(公告)日：2016-06-07

    申请号：US14666666

    申请日：2015-03-24

    Applicant: Marvell International Ltd.

    Inventor： Junqing Sun

    IPC: H04L25/03

    CPC classification number: H04L25/03146

    Abstract: Embodiments include a method comprising: receiving a signal comprising a plurality of symbols; estimating that a first symbol of the plurality of symbols has a first value; based on the first value of the first symbol, cancelling, at least in part, inter symbol interference that the first symbol has on a second symbol of the plurality of symbols; determining a first error associated with the first value of the first symbol; and in response to the first error being higher than a threshold value, generating, for the first symbol, a second value that is different from the first value of the first symbol, and based on the second value of the first symbol, cancelling, at least in part, inter symbol interference that the first symbol has on the second symbol.

    Abstract translation: 实施例包括一种方法，包括：接收包括多个符号的信号; 估计所述多个符号中的第一符号具有第一值; 基于第一符号的第一值，至少部分地消除第一符号对多个符号的第二符号具有的符号间干扰; 确定与第一符号的第一值相关联的第一错误; 并且响应于所述第一误差高于阈值，针对所述第一符号生成与所述第一符号的第一值不同的第二值，并且基于所述第一符号的所述第二值，在 至少部分地，第一符号在第二符号上具有符号间干扰。

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