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15 条记录 (耗时 0.033 秒)

    Polmux-OFDM-DD Transmitter and Receiver for Reduced Complexity and Overhead in Optical Access/Metro Transmission
    1.
    发明申请
    Polmux-OFDM-DD Transmitter and Receiver for Reduced Complexity and Overhead in Optical Access/Metro Transmission 有权
    Polmux-OFDM-DD发射机和接收机，用于降低光接入/城域传输中的复杂性和开销

    公开(公告)号：US20120263467A1

    公开(公告)日：2012-10-18

    申请号：US13446306

    申请日：2012-04-13

    申请人： Neda Cvijetic ,  Yue-Kai Huang ,  Narayan Prasad ,  Ting Wang

    发明人： Neda Cvijetic ,  Yue-Kai Huang ,  Narayan Prasad ,  Ting Wang

    IPC分类号： H04J14/06

    CPC分类号： H04J14/06 ,  H04B10/532 ,  H04B10/548 ,  H04J14/02 ,  H04L5/0023 ,  H04L25/0204 ,  H04L27/2096 ,  H04L27/223 ,  H04L27/2697 ,  H04L2025/03414 ,  H04L2025/03426

    摘要： An optical communication system includes a polarization multiplexed orthogonal frequency-division multiplexing POLMUX-OFDM transmitter for generating a POLMUX-OFDM double sideband signal, an optical processing path for processing the double sideband signal from the transmitter; an analog-to-digital convert ADC-OFDM receiver coupled to the optical processing path for receiving the double sideband signal processed by the optical path; and a block-diagonal multiple-input multiple-output MIMO equalizer responsive to the receiver for enabling correct operation for a completely random incoming signal polarization state without adaptive polarization control at said receiver, which enables complexity.

    摘要翻译： 光通信系统包括用于产生POLMUX-OFDM双边带信号的偏振复用正交频分复用POLMUX-OFDM发射机，用于处理来自发射机的双边带信号的光处理路径; 耦合到光学处理路径的用于接收由光路处理的双边带信号的模数转换ADC-OFDM接收器; 以及响应于接收机的块对角多输入多输出MIMO均衡器，用于使能在所述接收机处没有自适应偏振控制的完全随机输入信号偏振状态的正确操作，这使得复杂性。

    Efficient square-root free 2 symbol max-log receiver
    3.
    发明授权
    Efficient square-root free 2 symbol max-log receiver 有权
    高效的平方根自由2符号最大对数接收器

    公开(公告)号：US08767888B2

    公开(公告)日：2014-07-01

    申请号：US13433873

    申请日：2012-03-29

    申请人： Narayan Prasad ,  Neda Cvijetic ,  Sampath Rangarajan ,  Ting Wang

    发明人： Narayan Prasad ,  Neda Cvijetic ,  Sampath Rangarajan ,  Ting Wang

    IPC分类号： H04L27/06 ,  H04L25/02 ,  H04L25/06 ,  H04L25/03

    CPC分类号： H04L25/0246 ,  H04L25/03171 ,  H04L25/067

    摘要： The present invention employs a look up table based implementation for the metric computations which eliminate redundancy and substantially reduce the number of multiplications. Moreover, inventive method exploits the fact that the un-normalized constellation symbols are complex integers so that the product of a real-number and an un-normalized constellation symbol can be implemented by only additions. The inventive method also enables a greater efficiency for whitening colored noise prior to demodulation, one of which involves no square-root operation. The invention results in less complexity, faster operation, lower power consumption, without sacrificing performance.

    摘要翻译： 本发明使用用于度量计算的查找表实现，其消除冗余并且显着减少乘法次数。 此外，本发明的方法利用了未归一化的星座符号是复数整数的事实，使得实数和未归一化的星座符号的乘积可以仅通过添加来实现。 本发明的方法还使得能够在解调之前增加有色噪声的效率，其中之一不涉及平方根操作。 本发明导致更少的复杂性，更快的操作，更低的功耗，而不会牺牲性能。

    Efficient Square-Root Free 2 Symbol Max-Log Receiver
    6.
    发明申请
    Efficient Square-Root Free 2 Symbol Max-Log Receiver 有权
    高效平方根2符号最大日志接收器

    公开(公告)号：US20120250804A1

    公开(公告)日：2012-10-04

    申请号：US13433873

    申请日：2012-03-29

    申请人： Narayan Prasad ,  Neda Cvijetic ,  Sampath Rangarajan ,  Ting Wang

    发明人： Narayan Prasad ,  Neda Cvijetic ,  Sampath Rangarajan ,  Ting Wang

    IPC分类号： H04L27/06

    CPC分类号： H04L25/0246 ,  H04L25/03171 ,  H04L25/067

    摘要： The present invention employs a look up table based implementation for the metric computations which eliminate redundancy and substantially reduce the number of multiplications. Moreover, inventive method exploits the fact that the un-normalized constellation symbols are complex integers so that the product of a real-number and an un-normalized constellation symbol can be implemented by only additions. The inventive method also enables a greater efficiency for whitening colored noise prior to demodulation, one of which involves no square-root operation. The invention results in less complexity, faster operation, lower power consumption, without sacrificing performance

    摘要翻译： 本发明使用用于度量计算的查找表实现，其消除冗余并且显着减少乘法次数。 此外，本发明的方法利用了未归一化的星座符号是复数整数的事实，使得实数和未归一化的星座符号的乘积可以仅通过添加来实现。 本发明的方法还使得能够在解调之前增加有色噪声的效率，其中之一不涉及平方根操作。 本发明导致更少的复杂性，更快的操作，更低的功耗，而不会牺牲性能

    Single wavelength source-free OFDMA-PON communication systems and methods
    8.
    发明授权
    Single wavelength source-free OFDMA-PON communication systems and methods 有权
    单波长无源OFDMA-PON通信系统和方法

    公开(公告)号：US08233797B2

    公开(公告)日：2012-07-31

    申请号：US12545159

    申请日：2009-08-21

    申请人： Dayou Qian ,  Neda Cvijetic ,  Junqiang Hu ,  Ting Wang

    发明人： Dayou Qian ,  Neda Cvijetic ,  Junqiang Hu ,  Ting Wang

    IPC分类号： H04B10/20 ,  H04J14/00

    CPC分类号： H04J14/0282 ,  H04J14/0232 ,  H04J14/0247 ,  H04J14/0252 ,  H04J14/0298 ,  H04L25/0216

    摘要： Methods and systems for processing communication signals in an Orthogonal Frequency Division Multiple Access (OFDMA)-Passive Optical Network (PON) are disclosed. An optical carrier at a wavelength generated at an optical line terminal (OLT) may be reused by optical network units (ONUs) in the network for upstream transmission of data signals to the OLT. In addition, each ONU may perform carrier suppression to avoid broadband beating noise resulting from the simultaneous transmission of upstream data signals on the same wavelength. Further, the optical source at the OLT used to generate the optical carrier may be reused as a local oscillator for coherent detection of received upstream signals to minimize any frequency offsets.

    摘要翻译： 公开了在正交频分多址（OFDMA）无源光网络（PON）中处理通信信号的方法和系统。 在光线路终端（OLT）处生成的波长的光载波可以由网络中的光网络单元（ONU）重新使用，用于向OLT发送数据信号。 此外，每个ONU可以执行载波抑制以避免由于在相同波长上的上行数据信号的同时传输而导致的宽带打扰噪声。 此外，用于生成光载波的OLT处的光源可以重新用作本地振荡器，用于相干检测接收到的上行信号，以使任何频率偏移最小化。

    SINGLE WAVELENGTH SOURCE-FREE OFDMA-PON COMMUNICATION SYSTEMS AND METHODS
    9.
    发明申请
    SINGLE WAVELENGTH SOURCE-FREE OFDMA-PON COMMUNICATION SYSTEMS AND METHODS 有权
    单波长无源OFDMA-PON通信系统和方法

    公开(公告)号：US20100215368A1

    公开(公告)日：2010-08-26

    申请号：US12545159

    申请日：2009-08-21

    申请人： Dayou Qian ,  Neda Cvijetic ,  Junqiang Hu ,  Ting Wang

    发明人： Dayou Qian ,  Neda Cvijetic ,  Junqiang Hu ,  Ting Wang

    IPC分类号： H04J14/00

    CPC分类号： H04J14/0282 ,  H04J14/0232 ,  H04J14/0247 ,  H04J14/0252 ,  H04J14/0298 ,  H04L25/0216

    摘要： Methods and systems for processing communication signals in an Orthogonal Frequency Division Multiple Access (OFDMA)-Passive Optical Network (PON) are disclosed. An optical carrier at a wavelength generated at an optical line terminal (OLT) may be reused by optical network units (ONUs) in the network for upstream transmission of data signals to the OLT. In addition, each ONU may perform carrier suppression to avoid broadband beating noise resulting from the simultaneous transmission of upstream data signals on the same wavelength. Further, the optical source at the OLT used to generate the optical carrier may be reused as a local oscillator for coherent detection of received upstream signals to minimize any frequency offsets.

    摘要翻译： 公开了在正交频分多址（OFDMA）无源光网络（PON）中处理通信信号的方法和系统。 在光线路终端（OLT）处生成的波长的光载波可以由网络中的光网络单元（ONU）重新使用，用于向OLT发送数据信号。 此外，每个ONU可以执行载波抑制以避免由于在相同波长上的上行数据信号的同时传输而导致的宽带打扰噪声。 此外，用于生成光载波的OLT处的光源可以重新用作本地振荡器，用于相干检测接收到的上行信号，以使任何频率偏移最小化。