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1. 发明申请

US20180145806A1 METHOD AND APPARATUS FOR BIT NUMBER ALLOCATION AND POWER ALLOCATION OF SUBCARRIERS AND ELECTRONIC EQUIPMENT 审中-公开
公开(公告)号：US20180145806A1
公开(公告)日：2018-05-24
申请号：US15720471
申请日：2017-09-29
申请人： Fujitsu Limited
发明人： Bo Liu , Lei Li
IPC分类号： H04L5/00 , H04L27/26 , H04W52/24 , H04W36/14 , H04W36/30
CPC分类号： H04L5/0046 , H04L5/006 , H04L27/2626 , H04W36/14 , H04W36/30 , H04W52/24 , H04W52/241 , H04W52/267 , H04W52/346
摘要： An apparatus and method for bit number allocation and power allocation of subcarriers and electronic equipment. The apparatus includes: a bit number calculating unit configured to calculate bit numbers to which subcarriers in a multicarrier communications system correspond according to signal to noise ratios of the subcarriers; a bit number allocating unit configured to allocate bit numbers for the subcarriers based on the bit numbers to which the subcarriers correspond calculated by the bit number calculating unit and a phase noise of the multicarrier communications system in communicating; wherein, the allocated bit numbers are related to signal modulation formats of the subcarriers; and a power allocating unit configured to allocate corresponding power for the subcarriers according to the bit numbers allocated by the bit number allocating unit for the subcarriers. With the embodiments, a transmission performance of the multicarrier communications system may be improved.

2. 发明授权

US09973272B2 Method and apparatus for monitoring in-line signal quality and system 有权
公开(公告)号：US09973272B2
公开(公告)日：2018-05-15
申请号：US15475485
申请日：2017-03-31
申请人： Fujitsu Limited
发明人： Lei Li , Bo Liu , Zhenning Tao
IPC分类号： H04B10/00 , H04B10/079 , H04L5/00
CPC分类号： H04B10/07953 , H04L5/0048 , H04L5/006
摘要： A method and apparatus for monitoring in-line signal quality and a system. The method for monitoring in-line signal quality includes: according to signal to noise ratios (SNRs) of subcarriers obtained in a transmission initialization period, setting a subcarrier with a highest SNR to be a pilot subcarrier and other subcarriers to be data subcarriers; determining bit allocation and power allocation of the pilot subcarrier and bit allocation and power allocation of the data subcarriers; setting data-decision-based SNR measurement thresholds for the data subcarriers according to the bit allocation of the data subcarriers; and comparing the SNRs of the data subcarriers obtained through data-decision-based SNR measurement in a transmission period with the SNR measurement thresholds of the data subcarriers, and when an SNR of a data subcarrier is less than its SNR measurement threshold, trigger pilot-based SNR measurement of the data subcarrier. Hence, not only temporally continuous in-line signal quality monitoring may be provided, but also accuracy of the monitoring result may be guaranteed.

3. 发明授权

US09654156B2 Nonlinear compensating apparatus and method, transmitter and communication system 有权
公开(公告)号：US09654156B2
公开(公告)日：2017-05-16
申请号：US14884239
申请日：2015-10-15
申请人： FUJITSU LIMITED
发明人： Bo Liu , Weizhen Yan , Lei Li
IPC分类号： H04B1/04 , H04B1/62 , H04L25/03
CPC分类号： H04B1/0475 , H03F1/3241 , H04B1/62 , H04B2001/0425 , H04L25/03343
摘要： A nonlinear compensating apparatus and method, a transmitter and a communication system are provided. The apparatus includes a preprocessor configured to preprocess a transmitted signal according to a pre-obtained preprocessing coefficient and a predistorter configured to perform predistortion for the preprocessed signal, and a result of comparison of a characteristic parameter of the signal that has been preprocessed and then predistorted with that of the transmitted signal satisfies a predetermined condition. By preprocessing the transmitted signal at the transmitter end, the embodiments of the present disclosure may perform efficient nonlinear compensation only needing to measure at the transmitter end and without needing to perform many times of measurement at the receiver end, and may lower complexity of circuits of the communication system and complexity of calculation.

4. 发明申请

US20160127091A1 BIT ALLOCATION METHOD, APPARATUS FOR MULTICARRIER MODULATION SIGNAL, AND SYSTEM 审中-公开
标题翻译：位分配方法，MULARARRIER调制信号的装置和系统
公开(公告)号：US20160127091A1
公开(公告)日：2016-05-05
申请号：US14927636
申请日：2015-10-30
申请人： FUJITSU LIMITED
发明人： Weizhen YAN , Bo Liu , Lei Li , Zhenning Tao
IPC分类号： H04L5/00
摘要： A bit allocation method, apparatus for a multicarrier modulation signal and a system where the method includes: lowering the number of bits of a subcarrier of minimum average power in subcarriers of the multicarrier modulation signal allocated with a maximum number of bits according to a predetermined total number of bits to be adjusted including setting a total number of bits to be adjusted; determining a target number of bits according to the total number of bits; allocating a bit number for each subcarrier of the multicarrier modulation signal by using a predetermined bit allocation method according to the target; and lowering the number of bits of a subcarrier of minimum average power in the subcarriers allocated with a maximum number of bits, until a lowered total number of bits is equal to the total number of bits to be adjusted.
摘要翻译：一种分配方法，一种多载波调制信号的装置和一种系统，该方法包括：根据预定的总和，分配最大位数的多载波调制信号的子载波中的子载波中的最小平均功率的子载波的比特数要调整的比特数，包括设置要调整的总比特数; 根据总位数确定目标位数; 通过使用根据目标的预定比特分配方法为多载波调制信号的每个子载波分配比特数; 并且降低分配有最大比特数的子载波中的最小平均功率的子载波的比特数，直到下降的总比特数等于要调整的比特数。

5. 发明申请

US20160036473A1 NONLINEAR COMPENSATING APPARATUS AND METHOD, TRANSMITTER AND COMMUNICATION SYSTEM 有权
标题翻译：非线性补偿装置和方法，发射机和通信系统
公开(公告)号：US20160036473A1
公开(公告)日：2016-02-04
申请号：US14884239
申请日：2015-10-15
申请人： FUJITSU LIMITED
发明人： Bo LIU , Weizhen Yan , Lei Li
IPC分类号： H04B1/04 , H04B1/62
CPC分类号： H04B1/0475 , H03F1/3241 , H04B1/62 , H04B2001/0425 , H04L25/03343
摘要： A nonlinear compensating apparatus and method, a transmitter and a communication system are provided. The apparatus includes a preprocessor configured to preprocess a transmitted signal according to a pre-obtained preprocessing coefficient and a predistorter configured to perform predistortion for the preprocessed signal, and a result of comparison of a characteristic parameter of the signal that has been preprocessed and then predistorted with that of the transmitted signal satisfies a predetermined condition. By preprocessing the transmitted signal at the transmitter end, the embodiments of the present disclosure may perform efficient nonlinear compensation only needing to measure at the transmitter end and without needing to perform many times of measurement at the receiver end, and may lower complexity of circuits of the communication system and complexity of calculation.
摘要翻译：提供非线性补偿装置和方法，发射机和通信系统。该装置包括：预处理器，被配置为根据预先获得的预处理系数预处理发送信号;以及预失真器，被配置为对预处理信号执行预失真，以及比较已预处理然后被预失真的信号的特征参数的结果发送信号的信号满足预定条件。通过在发射机端预处理所发射的信号，本公开的实施例可以执行有效的非线性补偿，仅需要在发射机端进行测量，而不需要在接收机端执行许多次测量，并且可以降低电路的复杂度通信系统和计算复杂度。

6. 发明授权

US10389499B2 Method and apparatus for bit number allocation and power allocation of subcarriers and electronic equipment 有权
公开(公告)号：US10389499B2
公开(公告)日：2019-08-20
申请号：US15720471
申请日：2017-09-29
申请人： Fujitsu Limited
发明人： Bo Liu , Lei Li
IPC分类号： H04L5/00 , H04W36/14 , H04W36/30 , H04W52/34 , H04L27/26 , H04W52/24 , H04W52/26
摘要： An apparatus and method for bit number allocation and power allocation of subcarriers and electronic equipment. The apparatus includes: a bit number calculating unit configured to calculate bit numbers to which subcarriers in a multicarrier communications system correspond according to signal to noise ratios of the subcarriers; a bit number allocating unit configured to allocate bit numbers for the subcarriers based on the bit numbers to which the subcarriers correspond calculated by the bit number calculating unit and a phase noise of the multicarrier communications system in communicating; wherein, the allocated bit numbers are related to signal modulation formats of the subcarriers; and a power allocating unit configured to allocate corresponding power for the subcarriers according to the bit numbers allocated by the bit number allocating unit for the subcarriers. With the embodiments, a transmission performance of the multicarrier communications system may be improved.

7. 发明授权

US10038513B2 Bit allocation method and apparatus for multicarrier modulation signal, and system 有权
公开(公告)号：US10038513B2
公开(公告)日：2018-07-31
申请号：US15007868
申请日：2016-01-27
申请人： FUJITSU LIMITED
发明人： Hao Chen , Lei Li
IPC分类号： H04L12/50 , H04J11/00 , H04L27/26 , H04L5/00 , H04W52/24 , H04W52/34
摘要： A bit allocation method and apparatus for a multicarrier modulation signal and a system where the method includes: determining a signal to noise ratio margin according to a predefined probability of a maximum clipping noise that can be allowed by the system; and allocating the number of modulating bits and power in each subcarrier for a multicarrier modulation signal according to the signal to noise ratio margin. By presetting a signal to noise ratio margin for a clipping noise, tolerance of the signal for the clipping noise is increased, and bit error rate is efficiently lowered.

8. 发明申请

US20170288772A1 METHOD AND APPARATUS FOR MONITORING IN-LINE SIGNAL QUALITY AND SYSTEM 有权
公开(公告)号：US20170288772A1
公开(公告)日：2017-10-05
申请号：US15475485
申请日：2017-03-31
申请人： Fujitsu Limited
发明人： Lei Li , Bo Liu
IPC分类号： H04B10/079 , H04L5/00
CPC分类号： H04B10/07953 , H04L5/0048 , H04L5/006
摘要： A method and apparatus for monitoring in-line signal quality and a system. The method for monitoring in-line signal quality includes: according to signal to noise ratios (SNRs) of subcarriers obtained in a transmission initialization period, setting a subcarrier with a highest SNR to be a pilot subcarrier and other subcarriers to be data subcarriers; determining bit allocation and power allocation of the pilot subcarrier and bit allocation and power allocation of the data subcarriers; setting data-decision-based SNR measurement thresholds for the data subcarriers according to the bit allocation of the data subcarriers; and comparing the SNRs of the data subcarriers obtained through data-decision-based SNR measurement in a transmission period with the SNR measurement thresholds of the data subcarriers, and when an SNR of a data subcarrier is less than its SNR measurement threshold, trigger pilot-based SNR measurement of the data subcarrier. Hence, not only temporally continuous in-line signal quality monitoring may be provided, but also accuracy of the monitoring result may be guaranteed.

9. 发明授权

US09774399B2 Nonlinear compensation method and apparatus and system in multicarrier optical communication system 有权
公开(公告)号：US09774399B2
公开(公告)日：2017-09-26
申请号：US14987088
申请日：2016-01-04
申请人： FUJITSU LIMITED
发明人： Lei Li , Zhenning Tao
IPC分类号： H04B10/00 , H04B10/58 , H04B10/2543 , H04B10/69
CPC分类号： H04B10/58 , H04B10/2543 , H04B10/697 , H04B10/6972
摘要： A nonlinear compensation method and apparatus and a system in a multicarrier optical communication system where the method includes: determining a coefficient of a linear filter in nonlinear compensation according to an end-to-end channel linear response of the system; determining taps of a nonlinear compensation filter needing to be opened and coefficients of the taps according to a hardware compensation ability of the system and the coefficient of the linear filter; and compensating for a nonlinear damage of the system by using the selected coefficients of the nonlinear compensation filter. With the method, apparatus or the system provided by this application, very good compensation performance may be achieved in a range of power consumption of the multicarrier optical communication system by only opening and using few taps of the compensation filter.

10. 发明授权

US09130738B2 Sequence synchronization apparatus and method and receiver 有权
标题翻译：序列同步装置及方法及接收机
公开(公告)号：US09130738B2
公开(公告)日：2015-09-08
申请号：US14510578
申请日：2014-10-09
申请人： Fujitsu Limited
发明人： Hao Chen , Lei Li , Weizhen Yan , Bo Liu
IPC分类号： H04L7/00 , H04L7/04
CPC分类号： H04L7/041 , H04L27/261 , H04L27/2662 , H04L27/2675 , H04L27/2685
摘要： Embodiments of the present disclosure provide a sequence synchronization apparatus and method and a receiver. The sequence synchronization apparatus includes: a signal receiving unit configured to receive a clock synchronized signal including a training symbol, the training symbol being in-phase modulated or being modulated with a fixed phase difference based on all or part of subcarriers; and a symbol detecting unit configured to detect the training symbol, so as to achieve sequence synchronization of the signal. With the embodiments of the present disclosure, not only sequence synchronization may be achieved by using minimum complexity as possible, but also the sequence synchronization apparatus is made simple, fast and accurate.
摘要翻译：本公开的实施例提供了一种序列同步装置和方法以及接收机。序列同步装置包括：信号接收单元，被配置为接收包括训练符号的时钟同步信号，所述训练符号基于全部或部分子载波以相位调制或固定相位差进行调制; 以及符号检测单元，被配置为检测所述训练符号，以便实现所述信号的序列同步。利用本公开的实施例，不仅可以通过尽可能使用最小复杂度来实现序列同步，而且使序列同步装置变得简单，快速和准确。

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