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1. 发明申请

US20130315609A1 METHOD WITH IMPROVED PHASE ROBUSTNESS IN COHERENT DETECTED OPTICAL SYSTEM 有权
标题翻译：在相干检测光学系统中改进相位稳定性的方法
公开(公告)号：US20130315609A1
公开(公告)日：2013-11-28
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
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。

2. 发明授权

US09025969B2 Method with improved phase robustness in coherent detected optical system 有权
标题翻译：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。

3. 发明授权

US08391726B2 Method and apparatus for frame detection and polarization separation 有权
标题翻译：用于帧检测和偏振分离的方法和装置
公开(公告)号：US08391726B2
公开(公告)日：2013-03-05
申请号：US12712655
申请日：2010-02-25
申请人： Yuanjie Chen , Zhuhong Zhang , Chuandong Li , Fei Zhu , Yu Sheng Bai
发明人： Yuanjie Chen , Zhuhong Zhang , Chuandong Li , Fei Zhu , Yu Sheng Bai
IPC分类号： H04B10/06 , H04B10/00 , H04L27/28 , H04L12/66
CPC分类号： H04B10/60 , H04L25/03019 , H04L25/03159 , H04L2025/03426 , H04L2025/03445 , H04L2025/03522
摘要： An optical receiver comprising a frame detector configured to receive a polarized signal comprising a first bit stream and a second bit stream, and further configured to identify a plurality of frames in the first bit stream and the second bit stream using a composite header, and a time-domain equalizer (TDEQ) configured to separate the first bit stream and the second bit stream using a portion of the composite header.
摘要翻译：一种光接收机，包括帧检测器，其被配置为接收包括第一位流和第二位流的偏振信号，并且还被配置为使用复合报头来识别所述第一位流中的多个帧和所述第二位流，以及时域均衡器（TDEQ）被配置为使用复合报头的一部分来分离第一比特流和第二比特流。

4. 发明申请

US20110206385A1 Method and Apparatus for Frame Detection and Polarization Separation 有权
标题翻译：用于帧检测和极化分离的方法和装置
公开(公告)号：US20110206385A1
公开(公告)日：2011-08-25
申请号：US12712655
申请日：2010-02-25
申请人： Yuanjie Chen , Zhuhong Zhang , Chuandong Li , Fei Zhu , Yu Sheng Bai
发明人： Yuanjie Chen , Zhuhong Zhang , Chuandong Li , Fei Zhu , Yu Sheng Bai
IPC分类号： H04B10/06
CPC分类号： H04B10/60 , H04L25/03019 , H04L25/03159 , H04L2025/03426 , H04L2025/03445 , H04L2025/03522
摘要： An optical receiver comprising a frame detector configured to receive a polarized signal comprising a first bit stream and a second bit stream, and further configured to identify a plurality of frames in the first bit stream and the second bit stream using a composite header, and a time-domain equalizer (TDEQ) configured to separate the first bit stream and the second bit stream using a portion of the composite header.
摘要翻译：一种光接收机，包括帧检测器，其被配置为接收包括第一位流和第二位流的偏振信号，并且还被配置为使用复合报头来识别所述第一位流中的多个帧和所述第二位流，以及时域均衡器（TDEQ）被配置为使用复合报头的一部分来分离第一比特流和第二比特流。

5. 发明授权

US08738956B2 Method and apparatus for updating a fractional time interval using time-domain interpolators in optical communications 有权
$Method and apparatus for updating a fractional time interval using time-domain interpolators in optical communications$
标题翻译：用于在光通信中使用时域内插器更新分数时间间隔的方法和装置
公开(公告)号：US08738956B2
公开(公告)日：2014-05-27
申请号：US13096196
申请日：2011-04-28
申请人： Yuanjie Chen , Chuandong Li , Zhuhong Zhang , Fei Zhu , Yu Sheng Bai
发明人： Yuanjie Chen , Chuandong Li , Zhuhong Zhang , Fei Zhu , Yu Sheng Bai
IPC分类号： G06F1/00
CPC分类号： H03M1/0836 , H03M1/12
摘要： An apparatus comprising an analog-to-digital converter (ADC); a frequency-domain equalizer (FDEQ); a time-domain interpolator positioned between the ADC and the FDEQ, wherein the time domain interpolator is coupled to the ADC and the FDEQ and configured to perform a time-domain interpolation to compensate a signal sample for a plurality of ADC induced changes.
摘要翻译：一种包括模数转换器（ADC）的装置; 频域均衡器（FDEQ）; 位于ADC和FDEQ之间的时域插值器，其中时域内插器耦合到ADC和FDEQ，并且被配置为执行时域插值以补偿多个ADC引起的变化的信号采样。

6. 发明申请

US20120274364A1 Method and Apparatus of Using Time-Domain Interpoolators for Sampling Time Adjustment, Sampling Rate Change, and Sampling Misalignment Compensation in Optical Communications 有权
标题翻译：使用时域互连器进行采样时间调整，采样率变化和光通信中采样不对准补偿的方法和装置
公开(公告)号：US20120274364A1
公开(公告)日：2012-11-01
申请号：US13096196
申请日：2011-04-28
申请人： Yuanjie Chen , Chuandong Li , Zhuhong Zhang , Fei Zhu , Yu Sheng Bai
发明人： Yuanjie Chen , Chuandong Li , Zhuhong Zhang , Fei Zhu , Yu Sheng Bai
IPC分类号： H03C3/00
CPC分类号： H03M1/0836 , H03M1/12
摘要： An apparatus comprising an analog-to-digital converter (ADC); a frequency-domain equalizer (FDEQ); a time-domain interpolator positioned between the ADC and the FDEQ, wherein the time domain interpolator is coupled to the ADC and the FDEQ and configured to perform a time-domain interpolation to compensate a signal sample for a plurality of ADC induced changes.
摘要翻译：一种包括模数转换器（ADC）的装置; 频域均衡器（FDEQ）; 位于ADC和FDEQ之间的时域插值器，其中时域内插器耦合到ADC和FDEQ，并且被配置为执行时域插值以补偿多个ADC引起的变化的信号采样。

7. 发明申请

US20050270987A1 Selectable training signals based on stored previous connection information for DMT-based system 有权
公开(公告)号：US20050270987A1
公开(公告)日：2005-12-08
申请号：US11132147
申请日：2005-05-18
申请人： Yuanjie Chen
发明人： Yuanjie Chen
IPC分类号： H04L1/00 , H04L27/26 , H04J3/14 , G01R31/08 , G06F11/00 , G08C15/00 , H04B1/38 , H04J1/16 , H04L5/16 , H04L12/26
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.

8. 发明授权

US08149904B2 Asymmetric digital subscriber line modem apparatus and methods therefor 失效
标题翻译：非对称数字用户线调制解调器及其方法
公开(公告)号：US08149904B2
公开(公告)日：2012-04-03
申请号：US10350279
申请日：2003-01-24
申请人： Gregory H. Efland , Haixiang Liang , Kevin H. Peterson , Yuanjie Chen , Alan G. Corry , Nino P. Ferrario , Jeff Z. Guan , Meera Prahlad , Ilya Stomakhin , Yongbing Wan , Larry C. Yamano , Lin Yin , Gong-San Yu , George A. Papanicolaou
发明人： Gregory H. Efland , Haixiang Liang , Kevin H. Peterson , Yuanjie Chen , Alan G. Corry , Nino P. Ferrario , Jeff Z. Guan , Meera Prahlad , Ilya Stomakhin , Yongbing Wan , Larry C. Yamano , Lin Yin , Gong-San Yu , George A. Papanicolaou
IPC分类号： H04B1/38
CPC分类号： H04L7/0012 , G06F9/52 , H03M13/2732 , H03M13/6533 , H04L1/0071 , H04L7/0029 , H04L25/03159 , H04L27/2647 , H04L45/00 , H04L49/90 , H04L2012/5681 , H04M11/062
摘要： Provided is a system and method for a modem including one or more processing paths. Also included is a number of interconnected modules sequentially arrayed along the one or more paths. Each module is configured to (i) process signals passed along the paths in accordance with the sequence and (ii) implement predetermined functions to perform the processing. Further, each of the modules has a particular degree of functional programmability and the degrees of functional programmability monotonically vary in accordance with the sequence.
摘要翻译：提供了一种用于包括一个或多个处理路径的调制解调器的系统和方法。还包括沿着一个或多个路径顺序排列的多个互连模块。每个模块被配置为（i）根据顺序处理沿着路径传递的信号，以及（ii）实现预定功能以执行处理。此外，每个模块具有特定程度的功能可编程性，并且功能可编程性的程度根据顺序单调变化。

9. 发明授权

US06438158B1 Method and apparatus for implementing enhanced multiple modulus conversion techniques in a signal point mapping context 有权
标题翻译：用于在信号点映射上下文中实现增强的多模转换技术的方法和装置
公开(公告)号：US06438158B1
公开(公告)日：2002-08-20
申请号：US09476856
申请日：2000-01-03
申请人： Zhenyu Zhou , Xuming Zhang , Yuanjie Chen
发明人： Zhenyu Zhou , Xuming Zhang , Yuanjie Chen
IPC分类号： H04L516
CPC分类号： H04L25/4927
摘要： The present invention relates to multiple modulus conversion (MMC) techniques for mapping data in a pulse code modulation (PCM) modem system. In accordance with the present invention, signal point constellations are arranged to receive the output indices generated by the MMC procedure such that the probability of transmission of higher power codewords is relatively low compared to the probability of transmission of lower power codewords, while maintaining the same or larger minimum distance between signal points. In addition, the present invention provides techniques for obtaining the probability of occurrence for each constellation or signal point associated with a given data communication session and for determining the theoretical average transmit power associated with a given set of signal point constellations and MMC parameters. In addition, the present invention provides a method for estimating a reasonable upper bound for the average transmit power associated with a given set of signal point constellations and MMC parameters. The present invention is also capable of transmitting the codewords defined by an MMC procedure in a specific order that may be optimized in accordance with a particular cost function associated with the modem system.
摘要翻译：本发明涉及用于在脉码调制（PCM）调制解调器系统中映射数据的多模转换（MMC）技术。根据本发明，信号点星座被布置为接收由MMC过程产生的输出索引，使得较低功率码字的传输概率相对较低的较高功率码字的发送概率相对较低，同时保持相同或更大的信号点之间的最小距离。此外，本发明提供了用于获得与给定数据通信会话相关联的每个星座或信号点的出现概率以及用于确定与给定的一组信号点星座和MMC参数相关联的理论平均发射功率的技术。此外，本发明提供了一种用于估计与给定的信号点星座和MMC参数集合相关联的平均发射功率的合理上界的方法。本发明还能够以可以根据与调制解调器系统相关联的特定成本函数进行优化的特定顺序来发送由MMC过程定义的码字。

10. 发明授权

US07187696B2 Selectable training signals based on stored previous connection information for DMT-based system 有权
标题翻译：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：US07187696B2
公开(公告)日：2007-03-06
申请号：US11132147
申请日：2005-05-18
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.
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。

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