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1. 发明授权

US11153139B1 System, method and apparatus for Multi-Band Faster-than-Nyquist scheme-based communication 有权
公开(公告)号：US11153139B1
公开(公告)日：2021-10-19
申请号：US17158577
申请日：2021-01-26
申请人： HUAWEI TECHNOLOGIES CO., LTD.
发明人： Ahmed Mohamed Medra , Hossein Najafi , Zhuhong Zhang
IPC分类号： H04L27/10 , H04L27/26 , H04L25/03 , H04L1/00
摘要： The disclosed systems and methods are directed to transmitting and receiving symbols. In particular, splitting, a symbol dataset into symbol subsets, modulating, the symbol subsets using different sub-carriers, roll off factors and time acceleration factors, performing frequency shifting and combining the frequency shifted and modulated symbol subsets to generate a digital multiband (DMB) signal, transmitting and receiving the DMB signal, down converting the received DMB signal into a plurality of baseband signals, segregating the plurality of baseband signals in accordance with a manner by which the symbol subsets have been processed before transmission, forwarding a first portion of the plurality of baseband signals to a minimum mean square error (MMSE) based receiver, forwarding a second portion of the plurality of baseband signals to a matched filter-based receiver, and combining the output of the MMSE based receiver and matched filter-based receiver to generate an equivalent symbol dataset.

2. 发明授权

US10680718B2 Trellis based processing for robust digital multiband transmission 有权
公开(公告)号：US10680718B2
公开(公告)日：2020-06-09
申请号：US16293324
申请日：2019-03-05
申请人： Huawei Technologies Co., Ltd.
发明人： Mahdi Zamani , Jeebak Mitra , Hossein Najafi , Zhuhong Zhang , Chuandong Li
IPC分类号： H04B10/548 , H04B10/61 , H04B10/556
摘要： Aspects of the present disclosure are directed in part to a receiver DSP unit including an equalization module. The equalization module includes a trellis-based equalization module that may utilize multiple trellis-based processors (TBP), which can each be individually adaptively configured for performing a trellis-based equalization. The design of the TBPs allows them to be configured for compensating a residual Inter-Symbol Interference (ISI) as well as compensating a residual Phase Noise (PN). ISI is an example of an additive impairment and PN is an example of a multiplicative impairment that communication systems, particularly high speed transmission systems such as coherent optical systems, can suffer from.

3. 发明授权

US09774400B2 Method and apparatus for low-complexity quasi-reduced state soft-output equalizer 有权
公开(公告)号：US09774400B2
公开(公告)日：2017-09-26
申请号：US15184815
申请日：2016-06-16
申请人： Huawei Technologies Co., Ltd.
发明人： Jeebak Mitra , Zhuhong Zhang
IPC分类号： H04L25/03 , H04B10/61 , H04B10/2513
CPC分类号： H04B10/6161 , H04B10/25133 , H04L25/03197 , H04L25/03203 , H04L25/03216 , H04L25/067
摘要： Quasi-reduced state trellis equalization techniques achieve low-latency inter-symbol interference (ISI) equalization by selecting a subset of accumulated path metrics (APMs) for a leading symbol to propagate over a trellis to candidate states of a trailing symbol. This simplifies the computation of APMs for candidate states of the trailing symbol. Thereafter, APMs for candidate states of the trailing symbol are computed based on the subset of APMs for the leading symbol that were propagated over the trellis. Propagating fewer than all APMs for the leading symbol to the trailing symbol reduces the complexity of APM computation at the trailing symbol.

4. 发明授权

US09350450B2 Bit loading for optical discrete multi-tone transmission 有权
标题翻译：用于光学离散多音调传输的位加载
公开(公告)号：US09350450B2
公开(公告)日：2016-05-24
申请号：US14252099
申请日：2014-04-14
申请人： Huawei Technologies Co., Ltd.
发明人： Chen Chen , Mahdi Zamani , Zhuhong Zhang , Chuandong Li
IPC分类号： H04Q7/20 , H04B7/00 , H04B10/2507 , H04B10/40 , H04B10/50 , H04B10/516 , H04B10/69 , H04B10/2575 , H04B10/54 , H04B10/556
CPC分类号： H04B10/2507 , H04B10/2575 , H04B10/40 , H04B10/506 , H04B10/516 , H04B10/541 , H04B10/548 , H04B10/556 , H04B10/697 , H04L5/0046
摘要： System and method embodiments are provided for bit loading for optical Discrete Multi-Tone Transmission (DMT). In an embodiment, a method for bit loading for optical DMT transmission or reception includes receiving, at a processor, a bit data stream, wherein the bit data stream comprises a plurality of subcarriers; assigning, with the processor, a code rate to each of a plurality of forward error correction (FEC) encoders/decoders according to a mapping of a signal-to-noise-ratio (SNR) to a code rate for each of the subcarriers or subcarrier groups, wherein each FEC encoder/decoder corresponds to a respective one of the subcarriers or a respective subcarrier group; and assigning, with the processor, a modulation format to each subcarrier or each subcarrier group according to a mapping of an SNR for each subcarrier or subcarrier group to a bit number for a corresponding subcarrier or subcarrier group.
摘要翻译：提供了用于光离散多音传输（DMT）的比特加载的系统和方法实施例。在一个实施例中，用于光学DMT传输或接收的比特加载的方法包括在处理器处接收比特数据流，其中所述比特数据流包括多个子载波; 根据对每个子载波的信噪比（SNR）与码率的映射，将处理器分配给多个前向纠错（FEC）编码器/解码器中的每一个的码率，或者子载波组，其中每个FEC编码器/解码器对应于子载波中的相应一个或相应的子载波组; 并且根据对于每个子载波组或子载波组的SNR对应于相应副载波组或子载波组的比特数，将处理器分配给每个子载波组或每个子载波组的调制格式。

5. 发明授权

US09225432B2 System and method for a multi-wavelength coherent receiver 有权
标题翻译：用于多波长相干接收机的系统和方法
公开(公告)号：US09225432B2
公开(公告)日：2015-12-29
申请号：US14175423
申请日：2014-02-07
申请人： Huawei Technologies Co., Ltd.
发明人： Chen Chen , Zhuhong Zhang , Chuandong Li
IPC分类号： H04B10/00 , H04B10/61
CPC分类号： H04B10/6161 , H04B10/614 , H04B10/6162
摘要： Embodiments are provided for a novel multi-wavelength coherent receiver (MWCR) design and operation capable of detecting multiple optical wavelength channels. The embodiments include an optical receiver comprising a polarization-diversity optical hybrid module, a multiple wavelength local oscillator (MWLO) coupled to an input of the polarization-diversity optical hybrid module, a plurality of PIN diodes coupled to the polarization-diversity optical hybrid module, a plurality of analog-to-digital converters (ADCs) coupled to the PIN diodes, and a digital signal processing (DSP) module coupled to the ADCs. The polarization-diversity optical hybrid module splits an optical signal into multiple polarization components, wherein the optical signal includes multiple channels at multiple wavelengths. The MWLO locks the optical signal to the multiple wavelengths of the channels simultaneously. The DSP combines the signals from the ADCs corresponding to the polarization components and detects the channels at the wavelengths.
摘要翻译：提供实施例用于能够检测多个光波长信道的新型多波长相干接收机（MWCR）设计和操作。这些实施例包括光接收器，其包括偏振分集光混合模块，耦合到偏振分集光混合模块的输入的多波长本地振荡器（MWLO），耦合到偏振分集光混合模块耦合到PIN二极管的多个模数转换器（ADC）以及耦合到ADC的数字信号处理（DSP）模块。偏振分集光混合模块将光信号分成多个偏振分量，其中光信号包括多个波长的多个通道。 MWLO同时将光信号锁定到通道的多个波长。 DSP组合来自对应于偏振分量的ADC的信号，并检测波长处的通道。

6. 发明授权

US10673528B1 Methods and apparatuses for controlling optical signals in optical networks 有权
公开(公告)号：US10673528B1
公开(公告)日：2020-06-02
申请号：US16284414
申请日：2019-02-25
申请人： HUAWEI TECHNOLOGIES CO., LTD.
发明人： Zhiping Jiang , Chuandong Li , Zhuhong Zhang
IPC分类号： H04B10/2507 , H04B10/50 , H04B10/40 , H04B10/60 , H04B10/112 , H04B10/116 , H04B10/114 , H04B10/11
摘要： The disclosed systems, apparatuses and methods are directed to controlling optical channel signal and an optical network equipment in optical networks. The methods comprise adjusting an optical channel spectrum based on bit error rates (BER) measured for a dithered optical channel signal. The optical channel spectrum is dithered such that a signal reference frequency is alternated between a first second signal reference frequency and a second signal reference frequency. BER is measured and analysed separately for the dithered signal reference frequency being detuned to the first and to the second signal reference frequencies. Based on a BER difference between BER at the first signal reference frequency and BER at the second signal reference frequency, the optical channel spectrum is shifted with regards to frequency in order to improve optical network performance.

7. 发明申请

US20180091288A1 Method and Apparatus for Robust Clock Recovery in Coherent Optical Systems 有权
公开(公告)号：US20180091288A1
公开(公告)日：2018-03-29
申请号：US15353394
申请日：2016-11-16
申请人： Huawei Technologies Co., Ltd.
发明人： Mahdi Zamani , Mehdi Torbatian , Jeebak Mitra , Zhuhong Zhang , Chuandong Li
IPC分类号： H04L7/00 , H04B10/60
CPC分类号： H04L7/0075 , H04B10/60
摘要： An optical channel between a coherent optical transmitter and a coherent optical receiver may include one or more components that act as a bandpass filter with a passband that is narrower than the signal bandwidth. Such a narrow filter may significantly attenuate the signal content close to the band edge of the data signal. As a result, timing error detection may work less effectively, and therefore clock recovery may be less effective or fail. Methods and systems are disclosed in which a single optical carrier is used to transmit a data signal that has multiple bands, and timing error detection is performed at the receiver using one or more inner bands of the multiple bands. The timing error detection may therefore be made more robust to the effects of the narrow filtering.

8. 发明授权

US09749723B2 System and method for optical network 有权
公开(公告)号：US09749723B2
公开(公告)日：2017-08-29
申请号：US14877280
申请日：2015-10-07
申请人： Huawei Technologies Co., Ltd.
发明人： Zhiping Jiang , Chen Chen , Zhuhong Zhang , Chuandong Li
IPC分类号： H04J14/00 , H04Q11/00 , H04J14/02 , H04B10/25 , H04B10/50 , H04B10/572
CPC分类号： H04Q11/0005 , H04B10/25 , H04B10/503 , H04B10/572 , H04J14/021 , H04J14/0275 , H04J14/0282 , H04Q2011/0015 , H04Q2011/0016 , H04Q2011/0018 , H04Q2011/0032 , H04Q2011/0033 , H04Q2011/0039 , H04Q2011/0041 , H04Q2011/005 , H04Q2011/0058
摘要： An optical circuit switching matrix includes a plurality of optical ports, each optical port being optically coupled to a respective one of a plurality of user nodes and an optical coupler having at least one input port optically coupled to the plurality of optical ports, and an output port. The optical circuit switching matrix also includes a wavelength demultiplexer having an input optically coupled to the output port of the optical coupler, and a plurality of output ports, each output port being optically coupled to a respective one of the plurality of optical ports.

9. 发明授权

US09660845B2 System and method for state reduction in trellis equalizers using bounded state enumeration 有权
公开(公告)号：US09660845B2
公开(公告)日：2017-05-23
申请号：US14876378
申请日：2015-10-06
申请人： Huawei Technologies Co., Ltd.
发明人： Jeebak Mitra , Zhuhong Zhang
IPC分类号： H01L23/02 , H04L25/03
CPC分类号： H04L25/03203 , H04L2025/0342
摘要： Embodiment reduced-state trellis equalization techniques compute accumulated path metrics (APMs) for a subset of candidate states for at least some stages in the trellis based on a neighborhood map of an ML state. This reduces the number of APMs that are computed and stored during trellis equalization. Other embodiments select a subset of candidate states for which APMs are transported to the next stage of the trellis based on the neighborhood map. This eliminates the need to sort the remaining APMs during reduced state trellis equalization. The neighborhood map identifies a subset of the highest probability neighbors for an ML state. The subset of candidate states identified as highest probability neighbors may be saved in a look-up table. The look-up table may be generated offline and/or generated/updated dynamically during run-time operation.

10. 发明申请

US20170012712A1 Method and Apparatus for Low-Complexity Quasi-Reduced State Soft-Output Equalizer 审中-公开
标题翻译：低复杂度准简化状态软输出均衡器的方法与装置
公开(公告)号：US20170012712A1
公开(公告)日：2017-01-12
申请号：US15184815
申请日：2016-06-16
申请人： Huawei Technologies Co., Ltd.
发明人： Jeebak Mitra , Zhuhong Zhang
IPC分类号： H04B10/61 , H04B10/2513 , H04L25/03
CPC分类号： H04B10/6161 , H04B10/25133 , H04L25/03197 , H04L25/03203 , H04L25/03216 , H04L25/067
摘要： Quasi-reduced state trellis equalization techniques achieve low-latency inter-symbol interference (ISI) equalization by selecting a subset of accumulated path metrics (APMs) for a leading symbol to propagate over a trellis to candidate states of a trailing symbol. This simplifies the computation of APMs for candidate states of the trailing symbol. Thereafter, APMs for candidate states of the trailing symbol are computed based on the subset of APMs for the leading symbol that were propagated over the trellis. Propagating fewer than all APMs for the leading symbol to the trailing symbol reduces the complexity of APM computation at the trailing symbol.
摘要翻译：准减速状态网格均衡技术通过选择用于先行符号的累积路径度量（APM）的子集来实现低等待时间间符号间干扰（ISI）均衡，从而将网格传播到尾随符号的候选状态。这简化了尾随符号的候选状态的APM的计算。此后，基于在网格上传播的领先符号的APM的子集来计算用于候选状态的尾随符号的APM。传播较少的所有APM的领先符号到尾随符号减少APM计算在尾随符号的复杂性。

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