公开(公告)号：US20110064421A1

公开(公告)日：2011-03-17

申请号：US12835251

申请日：2010-07-13

申请人： Huijian ZHANG ,  Zhenning Tao ,  Shoichiro Oda

发明人： Huijian ZHANG ,  Zhenning Tao ,  Shoichiro Oda

IPC分类号： H04B10/06

CPC分类号： H04B10/6161

摘要： This application relates to an apparatus and a method for equalizing chromatic dispersion and a digital coherent optical receiver. The apparatus for equalizing chromatic dispersion comprising: a chromatic dispersion equalizing unit, for compensating chromatic dispersion of an input signal; and an additional time delay removing unit, for removing, in accordance with frequency offset of the input signal, chromatic dispersion equalization time delay generated by the chromatic dispersion equalizing unit.

摘要翻译： 本申请涉及用于均衡色散和数字相干光接收机的装置和方法。 用于均衡色散的装置包括：色散均衡单元，用于补偿输入信号的色散; 以及附加的时间延迟去除单元，用于根据输入信号的频率偏移去除由色散均衡单元产生的色散均衡时间延迟。

公开(公告)号：US20100003028A1

公开(公告)日：2010-01-07

申请号：US12479363

申请日：2009-06-05

申请人： Huijian ZHANG ,  Zhenning Tao ,  Takahito Tanimura

发明人： Huijian ZHANG ,  Zhenning Tao ,  Takahito Tanimura

IPC分类号： H04J14/06

CPC分类号： H04B10/6166 ,  H04B10/61 ,  H04B10/611 ,  H04B10/614 ,  H04J14/06

摘要： In present invention, a filter coefficient adjustment apparatus is used in a polarization demultiplexer which demultiplexes the input signals by using filters to obtain demultiplexed output signals, said filter coefficient adjustment apparatus being used for adjusting the coefficients of the filters, wherein said filter coefficient adjustment apparatus comprises: an logarithm partial derivative calculation unit for calculating the logarithm partial derivative value of a target probability density function of the demultiplexed output signals when its self-variable value is the present demultiplexed output signal value; a gradient calculation unit for calculating the gradient of a target optimizing function for optimizing the distribution of the multiplexed output signals based on the logarithm partial derivative value calculated by the logarithm partial derivative calculation unit; and a filter coefficient updating unit for updating the coefficients of the filters based on the gradient calculated by the gradient calculation unit.

摘要翻译： 在本发明中，滤波器系数调整装置用于通过使用滤波器对输入信号进行解复用以获得解复用输出信号的偏振解复用器，所述滤波器系数调整装置用于调整滤波器的系数，其中所述滤波器系数调整装置 包括：对数偏导数计算单元，用于当其自变量值为当前解复用的输出信号值时，计算解复用输出信号的目标概率密度函数的对数偏导数值; 梯度计算单元，用于基于由对数偏导数计算单元计算的对数偏导数值来计算用于优化多路复用输出信号的分布的目标优化函数的梯度; 以及滤波器系数更新单元，用于基于由梯度计算单元计算的梯度来更新滤波器的系数。

公开(公告)号：US20090245815A1

公开(公告)日：2009-10-01

申请号：US12320740

申请日：2009-02-03

申请人： Huijian ZHANG ,  Lei LI ,  Zhenning TAO ,  Hisao NAKASHIMA

发明人： Huijian ZHANG ,  Lei LI ,  Zhenning TAO ,  Hisao NAKASHIMA

IPC分类号： H04B10/06

CPC分类号： H04B10/6161 ,  H04B10/61 ,  H04B10/6164 ,  H04B10/63

摘要： The present invention discloses a frequency offset detecting apparatus and method for use in a digital coherent optical receiver. The digital coherent optical receiver comprises: a front-end processing section for generating a digital baseband electric signal; an equalizer for performing equalized filtering on the digital baseband electric signal; and the frequency offset detecting apparatus for detecting frequency offset contained in the digital baseband electric signal or frequency offset contained in a signal outputted by the equalizer; wherein the frequency offset detecting apparatus comprises an argument difference obtaining unit, a first subtracter, a second subtracter, a quantizer and an averager, of which the argument difference obtaining unit obtains an argument difference of adjacent symbols in a signal inputted therein; the first subtracter subtracts an output of the averager from the argument difference obtained by the argument difference obtaining unit; the quantizer performs uniform quantization with predetermined intervals on an output of the first subtracter; the second subtracter subtracts an output of the quantizer from the argument difference obtained by the argument difference obtaining unit; and the averager averages an output of the second subtracter.

摘要翻译： 本发明公开了一种在数字相干光接收机中使用的频偏检测装置和方法。 数字相干光接收机包括：前端处理部分，用于产生数字基带电信号; 均衡器，用于对数字基带电信号进行均衡滤波; 以及频率偏移检测装置，用于检测包含在由均衡器输出的信号中的数字基带电信号或频率偏移中的频率偏移; 其中，所述频偏检测装置包括自变量差分获取单元，第一减法器，第二减法器，量化器和平均器，其中所述变差差获取单元获取其中输入的信号中的相邻符号的自变量差; 所述第一减法器从由所述变元差分获取单元获得的自变量差中减去所述平均器的输出; 量化器在第一减法器的输出上以预定间隔执行均匀量化; 所述第二减法器根据由所述自变量差获取单元获得的参数差减去所述量化器的输出; 并且平均器对第二减法器的输出进行平均。

公开(公告)号：US20110293031A1

公开(公告)日：2011-12-01

申请号：US13114537

申请日：2011-05-24

申请人： Huijian ZHANG ,  Shenning TAO

发明人： Huijian ZHANG ,  Shenning TAO

IPC分类号： H04B15/00 ,  H04L27/02

CPC分类号： H04L5/0007 ,  H04L1/0016 ,  H04L1/0021 ,  H04L5/0046 ,  H04L5/006

摘要： The present invention discloses a method and apparatus for bit and power allocation and a communication system. The method for bit and power allocation comprises: determining a set of candidate modulation modes for sub-channels; constructing an SNR lookup table according to a predetermined target BER, the SNR lookup table containing a relationship of an SNR and the number of bits corresponding to a modulation mode in the set of candidate modulation modes at the target BER; obtaining normalized SNRs on the sub-channels; initializing the numbers of bits for the sub-channels; initializing powers for the sub-channels according to the numbers of bits for the sub-channels, the normalized SNRs on the sub-channels and the SNR lookup table; and adjusting the numbers of bits and the powers for the sub-channels in accordance with a principle of maximizing power utilization rate, to obtain the result of the bit and power allocation for the sub-channels.

摘要翻译： 本发明公开了一种用于比特和功率分配的方法和装置以及通信系统。 用于比特和功率分配的方法包括：确定用于子信道的一组候选调制模式; 根据预定目标BER构建SNR查找表，所述SNR查找表包含与所述目标BER中的候选调制模式集合中的调制模式相对应的SNR和比特数的关系; 在子信道上获得归一化的SNR; 初始化子信道的比特数; 根据子信道的比特数，子信道的归一化SNR和SNR查找表，初始化子信道的功率; 并且根据最大化功率利用率的原理来调整子信道的比特数和功率，以获得子信道的比特和功率分配的结果。