公开(公告)号：US20160204871A1

公开(公告)日：2016-07-14

申请号：US14596875

申请日：2015-01-14

申请人： Chuandong Li ,  Zhuhong Zhang ,  Mahdi Zamani

发明人： Chuandong Li ,  Zhuhong Zhang ,  Mahdi Zamani

IPC分类号： H04B10/516

CPC分类号： H04B10/5161 ,  H04L27/2601

摘要： Optical network devices and method for optical network communications in discrete multi-tone (DMT) are provided. A serial information signal is converted to groups of bits and loaded to parallel processing branches based on bit rates of the parallel processing branches. Each branch is configured to encode the associated group of data bits on the associated tone. A first bit rate and modulation and power allocation to a first branch of the branches may be different from a second bit rate and modulation and power allocation to a second branch of the branches. To recover the incoming data, the encoded signal may be parallel-processed using branches with different demodulation formats and provide the serial data stream.

摘要翻译： 提供了离散多音（DMT）光网络通信的光网络设备和方法。 基于并行处理分支的比特率，将串行信息信号转换为比特组并加载到并行处理分支。 每个分支被配置为对相关联音调上的相关联的数据位组进行编码。 对分支的第一分支的第一比特率和调制和功率分配可以不同于第二比特率以及对分支的第二分支的调制和功率分配。 为了恢复输入数据，编码信号可以使用具有不同解调格式的分支并行处理并提供串行数据流。

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。

公开(公告)号：US20130243420A1

公开(公告)日：2013-09-19

申请号：US13423959

申请日：2012-03-19

申请人： Chuandong Li ,  Zhuhong Zhang ,  Fei Zhu ,  Yu Sheng Bai

发明人： Chuandong Li ,  Zhuhong Zhang ,  Fei Zhu ,  Yu Sheng Bai

IPC分类号： H04B10/08

CPC分类号： H04B10/6162

摘要： An apparatus and method for performing joint equalization and timing recovery in coherent optical systems. The method includes equalizing signals to generate compensated polarization signals, wherein timing error in a distorted optical signal is calculated based on one of the compensated polarization signals. The method further includes performing resampling polarization signals to correct timing offset in an optical signal based on the calculated timing error. The calculated timing error may also be used to adaptively control one or more operating parameters of an external device.

摘要翻译： 用于在相干光学系统中执行联合均衡和定时恢复的装置和方法。 该方法包括均衡信号以产生补偿的偏振信号，其中基于补偿的偏振信号中的一个来计算失真的光信号中的定时误差。 该方法还包括基于所计算的定时误差来执行重采样偏振信号以校正光信号中的定时偏移。 所计算的定时误差也可用于自适应地控制外部设备的一个或多个操作参数。

公开(公告)号：US08340534B2

公开(公告)日：2012-12-25

申请号：US12847749

申请日：2010-07-30

申请人： Zhuhong Zhang ,  Chuandong Li ,  Fei Zhu ,  Yusheng Bai

发明人： Zhuhong Zhang ,  Chuandong Li ,  Fei Zhu ,  Yusheng Bai

IPC分类号： H04B10/06

CPC分类号： H04J14/06 ,  H04J14/002

摘要： A method comprising generating a plurality of first symbols that correspond to a side band pilot tone (SBPT) signal for a plurality of data streams, mapping the first symbols into a plurality of second symbols that correspond to a plurality of signal components of the polarization multiplexed (PM) optical signal, and transmitting the second symbols in a plurality of data blocks of a PM optical signal. An apparatus comprising at least one processor coupled to a memory and configured to obtain a data block that comprises a plurality of SBPTs in a received PM optical signal, estimate a set of values for a carrier frequency and a polarization state, update a tap weight of a master equalizer based on the estimated set of values, and update a plurality of slave equalizers based on the updated tap weight of the master equalizer.

摘要翻译： 一种方法，包括生成对应于多个数据流的边带导频（SBPT）信号的多个第一符号，将第一符号映射成与偏振复用的多个信号分量相对应的多个第二符号 （PM）光信号，并且在PM光信号的多个数据块中发送第二符号。 一种装置，包括耦合到存储器并被配置为获得包含接收的PM光信号中的多个SBPT的数据块的至少一个处理器，估计载波频率和极化状态的一组值，更新一个 基于估计的值集合的主均衡器，并且基于主均衡器的更新抽头权重来更新多个从均衡器。

公开(公告)号：US08180228B1

公开(公告)日：2012-05-15

申请号：US12273597

申请日：2008-11-19

申请人： James Harley ,  Chuandong Li

发明人： James Harley ,  Chuandong Li

IPC分类号： H04B10/06

CPC分类号： H04B10/697 ,  H04L7/0004 ,  H04L7/0062 ,  H04L25/03178 ,  H04L25/03292 ,  H04L27/02

摘要： In a direct-detection receiver having an analog-to-digital converter (ADC) for sampling a received optical signal and a sequence estimator for recovering data symbols from a multi-bit sample stream generated by the ADC, a method of acquiring a channel lock condition of a clock recovery block of the receiver. A plurality of sets of channel statistics are provided. Each set of channel statistics optimizes performance of the sequence estimator for a respective predetermined combination of channel chromatic dispersion and polarization mode dispersion. At least one set of channel statistics will, when installed in the sequence estimator, yield symbol estimates having residual distortions that are within an acquisition range of the clock recovery block. During start-up of the receiver, one of the sets of channel statistics is selected and installed in the Sequence Estimator. If a channel lock condition is not detected within a predetermined time interval, the step of selecting one of the sets of channel statistics and installing the selected set of channel statistics in the Sequence Estimator is repeated until a channel lock condition is detected.

摘要翻译： 在具有用于对接收到的光信号进行采样的模数转换器（ADC）的直接检测接收机和用于从由ADC产生的多位采样流中恢复数据符号的序列估计器的方法中，获取通道锁 接收机的时钟恢复块的状态。 提供多组信道统计。 每组信道统计优化针对信道色散和偏振模色散的相应预定组合的序列估计器的性能。 当安装在序列估计器中时，至少一组信道统计将产生具有在时钟恢复块的采集范围内的残余失真的符号估计。 在接收机启动过程中，选择频道统计信息之一并将其安装在序列估计器中。 如果在预定时间间隔内没有检测到通道锁定条件，则重复在序列估计器中选择信道统计信息集合和安装所选择的一组信道统计信息的步骤，直到检测到信道锁定状态。

公开(公告)号：US20110199982A1

公开(公告)日：2011-08-18

申请号：US13125997

申请日：2009-11-04

申请人： Lai-King Tee ,  Yi Song ,  Neng Wang ,  Chuandong Li

发明人： Lai-King Tee ,  Yi Song ,  Neng Wang ,  Chuandong Li

IPC分类号： H04J11/00 ,  H04L27/28

CPC分类号： H04W72/0406 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0025 ,  H04L5/0046 ,  H04L27/0008 ,  H04L27/2614 ,  H04L27/2636

摘要： In general, according to an embodiment, a wireless transmitter includes a plurality of coding and modulation modules to apply corresponding coding and modulation algorithms to input information blocks. A discrete Fourier transform (DFT) precoder applies DFT processing to outputs of the coding and modulation modules, and an inverse fast Fourier transform (IFFT) module receives a DFT output of the DFT precoder, which is mapped to different subcarriers according to the resource allocation indicated by the base station, and applies IFFT processing to the DFT output. An output processing stage produces output signals based on the output of the IFFT module to transmit wirelessly to a wireless receiver. In a different implementation, the outputs of the coding and modulation modules can be provided to an IFFT module to produce IFFT-processed output information.

摘要翻译： 通常，根据实施例，无线发射机包括多个编码和调制模块，以将相应的编码和调制算法应用于输入信息块。 离散傅立叶变换（DFT）预编码器对编码和调制模块的输出应用DFT处理，并且快速傅里叶逆变换（IFFT）模块接收DFT预编码器的DFT输出，其根据资源分配被映射到不同的子载波 由基站指示，并对DFT输出应用IFFT处理。 输出处理级根据IFFT模块的输出产生无线传输到无线接收器的输出信号。 在不同的实现中，编码和调制模块的输出可以被提供给IFFT模块以产生经IFFT处理的输出信息。

公开(公告)号：US20090304391A1

公开(公告)日：2009-12-10

申请号：US12330691

申请日：2008-12-09

申请人： James Harley ,  Kim Roberts ,  Chuandong Li

发明人： James Harley ,  Kim Roberts ,  Chuandong Li

IPC分类号： H04B10/12

CPC分类号： H04B10/532 ,  H04B10/25137 ,  H04B10/6972 ,  H04B2210/252 ,  H04B2210/254

摘要： Described are an optical communications system and a method that allow for compensation of chromatic dispersion and polarization mode dispersion imparted to a communications signal propagating through an optical link. The system is based on a cost-effective optical transport architecture that accommodates baud rates exceeding 15 Gbaud and eliminates the need for costly optical dispersion compensators. Compensation for polarization mode dispersion is performed at the receiver using nonlinear processing. Advantageously, direct detection modulation using inexpensive electro-optic system components can be used in place of more costly and complex coherent and differential modulation formats. Digital filtering can be performed at the transmitter and the input signal can be inverted based on the nonlinearity of the transmitter electro-optic components. Consequently, the bandwidth and linearity requirements for the transmitter electro-optic components are relaxed, and cost reductions are realized.

摘要翻译： 描述了允许对通过光链路传播的通信信号赋予色散和偏振模色散的补偿的光通信系统和方法。 该系统基于具有成本效益的光学传输架构，其适应波特率超过15Gbaud，并且不需要昂贵的光学色散补偿器。 使用非线性处理在接收机处执行偏振模色散的补偿。 有利地，可以使用廉价的电光系统组件的直接检测调制来代替更昂贵和复杂的相干和差分调制格式。 可以在发射机处执行数字滤波，并且可以基于发射机电光部件的非线性来反转输入信号。 因此，放大了发射机电光元件的带宽和线性要求，并实现成本降低。