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    Selectable training signals based on stored previous connection information for DMT-based system
    12.
    发明授权
    Selectable training signals based on stored previous connection information for DMT-based system 有权
    基于DMT系统存储的先前连接信息可选训练信号

    公开(公告)号：US06922397B1

    公开(公告)日：2005-07-26

    申请号：US09863522

    申请日：2001-05-23

    申请人： Yuanjie Chen

    发明人： Yuanjie Chen

    IPC分类号： H04L1/00 ,  H04L27/26 ,  G01R31/08 ,  H04J3/16

    CPC分类号： H04L27/261 ,  H04L1/0001 ,  H04L1/0006 ,  H04L27/2613

    摘要： Training signals can be chosen based on stored prior connection information to reduce the use of extra tones in transmitted training signals and thereby improve receiver performance. By choosing training signals based on the stored prior connection information, it is possible to make the training signals indirectly a function of the loop impairments. One advantage of this scheme is that we can choose to omit certain tones in the training signals, based on previous connection information, on a loop-by-loop basis. For example, in an ADSL Transceiver Unit-Central office end (ATU-C) device, per-local-loop prior connection information may be employed to select DMT tones to be included in downstream training signals. Similarly, in an ADSL Transceiver Unit-Remote terminal end (ATU-R) device, prior connection information may be employed to select DMT tones to be included in upstream training signals. In each case, local echoes are effectively reduced and local receiver training is improved without affecting eventual data transmission performance in the other direction. As a result, higher AGC gain and higher signal-to-quantization-noise ratios can be achieved, especially in the case of long loops. These benefits can allow (1) improvements in the loop performance in the receiving direction and/or (2) reductions in the requirements on the receiving ADC. In addition, crosstalks into the other wire pairs, especially those in the same bundle, are also reduced, improving the transmission environment on those pairs.

    摘要翻译： 可以基于存储的先前连接信息来选择训练信号，以减少所传送训练信号中额外音调的使用，从而提高接收机性能。 通过基于存储的先前连接信息选择训练信号，可以间接地使训练信号成为循环障碍的函数。 该方案的一个优点是，我们可以逐个循环地选择在训练信号中基于以前的连接信息省略某些音调。 例如，在ADSL收发单元 - 中心局端（ATU-C）设备中，可以采用每个本地环路以前的连接信息来选择要包括在下游训练信号中的DMT音调。 类似地，在ADSL收发器单元 - 远程终端（ATU-R）设备中，可以采用先前的连接信息来选择要包括在上行训练信号中的DMT音调。 在每种情况下，本地回波被有效地减少，并且本地接收机训练得到改善，而不影响另一方向的最终数据传输性能。 结果，可以实现更高的AGC增益和更高的信号与量化噪声比，特别是在长环路的情况下。 这些优点可以允许（1）改善接收方向的环路性能和/或（2）降低对接收ADC的要求。 此外，还减少了对另一个线对的串扰，特别是同一束中的串扰，从而改善了这些对上的传输环境。

    Method with improved phase robustness in coherent detected optical system
    13.
    发明授权
    Method with improved phase robustness in coherent detected optical system 有权
    相干检测光学系统相位鲁棒性提高的方法

    公开(公告)号：US09025969B2

    公开(公告)日：2015-05-05

    申请号：US13480230

    申请日：2012-05-24

    申请人： Chuandong Li ,  Yuanjie Chen ,  Zhuhong Zhang ,  Yi Cai ,  Fei Zhu

    发明人： Chuandong Li ,  Yuanjie Chen ,  Zhuhong Zhang ,  Yi Cai ,  Fei Zhu

    IPC分类号： H04B10/06 ,  H04B10/61

    CPC分类号： H04B10/613 ,  H04B10/6164

    摘要： An optical signal receiver tracks local oscillator frequency offset (LOFO) and compensates for the phase distortion introduced in the received signals as a result of utilizing the local oscillator within a coherent detection scheme. This phase distortion is basically a constant phase rotation caused by the LOFO and implementation of the receiver using coherent detection and a digital interferometer instead of a conventional (yet complex) carrier phase estimation or recovery scheme. With an optical receiver implemented in this manner, the requirement of using a precise local oscillator laser with low frequency offset is less important.

    摘要翻译： 光信号接收器跟踪本地振荡器频率偏移（LOFO），并且通过在相干检测方案中利用本地振荡器来补偿在接收信号中引入的相位失真。 该相位失真基本上是由LOFO引起的恒定相位旋转和使用相干检测的接收机的实现以及数字干涉仪而不是常规（但复杂的）载波相位估计或恢复方案。 通过以这种方式实现的光接收机，使用具有低频偏移的精确本地振荡器激光器的要求不那么重要。

    Selectable training signals based on stored previous connection information for DMT-based system
    15.
    发明授权
    Selectable training signals based on stored previous connection information for DMT-based system 有权
    基于DMT系统存储的先前连接信息可选训练信号

    公开(公告)号：US07957308B2

    公开(公告)日：2011-06-07

    申请号：US11714247

    申请日：2007-03-06

    申请人： Yuanjie Chen

    发明人： Yuanjie Chen

    IPC分类号： G01R31/08

    CPC分类号： H04L27/261 ,  H04L1/0001 ,  H04L1/0006 ,  H04L27/2613

    摘要： In a DMT based system, training signals can be chosen based on stored prior connection information to reduce using extra tones in transmitted training signals to improve receiver performance. By choosing training signals based on the stored prior connection information, training signals may be made to indirectly represent a function of the loop impairments. Certain training signal tones in the training signals may be omitted, based on previous connection information, on a loop-by-loop basis. Local echoes are effectively reduced and local receiver training is improved without affecting eventual data transmission performance. Higher AGC gain and higher signal-to-quantization-noise ratios can be achieved, especially in the case of long loops. These benefits can allow (1) improvements in the loop performance in the receiving direction and/or (2) reductions in the requirements on the receiving ADC. Crosstalks into other wire pairs of a bundle, are reduced, improving the transmission environment on those pairs.

    摘要翻译： 在基于DMT的系统中，可以基于存储的先前连接信息来选择训练信号，以减少在发送的训练信号中使用额外音调以改善接收机性能。 通过基于存储的先前连接信息选择训练信号，可以进行训练信号间接地表示环路损伤的功能。 可以基于先前的连接信息，逐个循环地省略训练信号中的某些训练信号音。 本地回波有效减少，本地接收机训练得到改善，不影响最终的数据传输性能。 可以实现更高的AGC增益和更高的信号与量化噪声比，特别是在长环路的情况下。 这些优点可以允许（1）改善接收方向的环路性能和/或（2）降低对接收ADC的要求。 串扰到其他线对的串扰被减少，改善了这些对上的传输环境。

    Selectable training signals based on stored previous connection information for DMT-based system
    16.
    发明申请
    Selectable training signals based on stored previous connection information for DMT-based system 有权

    公开(公告)号：US20070171940A1

    公开(公告)日：2007-07-26

    申请号：US11714247

    申请日：2007-03-06

    申请人： Yuanjie Chen

    发明人： Yuanjie Chen

    IPC分类号： H04J1/00

    CPC分类号： H04L27/261 ,  H04L1/0001 ,  H04L1/0006 ,  H04L27/2613

    摘要： Training signals can be chosen based on stored prior connection information to reduce the use of extra tones in transmitted training signals and thereby improve receiver performance. By choosing training signals based on the stored prior connection information, it is possible to make the training signals indirectly a function of the loop impairments. One advantage of this scheme is that we can choose to omit certain tones in the training signals, based on previous connection information, on a loop-by-loop basis. For example, in an ADSL Transceiver Unit-Central office end (ATU-C) device, per-local-loop prior connection information may be employed to select DMT tones to be included in downstream training signals. Similarly, in an ADSL Transceiver Unit-Remote terminal end (ATU-R) device, prior connection information may be employed to select DMT tones to be included in upstream training signals. In each case, local echoes are effectively reduced and local receiver training is improved without affecting eventual data transmission performance in the other direction. As a result, higher AGC gain and higher signal-to-quantization-noise ratios can be achieved, especially in the case of long loops. These benefits can allow (1) improvements in the loop performance in the receiving direction and/or (2) reductions in the requirements on the receiving ADC. In addition, crosstalks into the other wire pairs, especially those in the same bundle, are also reduced, improving the transmission environment on those pairs.