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公开(公告)号：US20190190651A1
公开(公告)日：2019-06-20
申请号：US15841988
申请日：2017-12-14
摘要： Client data bits, including first client data bits and second client data bits, are communicated from a transmitter to a receiver. At the transmitter, the first client data bits are processed to generate processed values, where each processed value is more likely to be a first element than a second element. Forward Error Correction ‘FEC’ encoding is applied to the second client data bits to generate FEC-encoded values. Symbols are created by mapping the FEC-encoded values to first positions in the symbols and by mapping the processed values to second positions in the symbols. The symbols are modulated onto a communications channel using a modulation scheme with a code that assigns a lower average energy to symbols containing the first elements in the second positions than to symbols containing the second elements in the second positions. At the receiver, client data bits are decoded using conditional chain decoding.
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公开(公告)号：US20210126734A1
公开(公告)日：2021-04-29
申请号：US16666520
申请日：2019-10-29
摘要： A system is configured to measure a forward error correction (FEC) decoding property associated with applying FEC decoding to FEC-encoded bits or symbols at a receiver device deployed in a communication network. The system is further configured to provide an assessment of operating conditions of the receiver device based on the FEC decoding property. In one example, the FEC decoding property comprises a distribution of a number of iterations of a FEC decoding operation applied to a plurality of FEC blocks processed within a period of time. In some examples, the FEC decoding property comprises any one of heat, temperature, current, voltage, active clock cycles, idle clock cycles, activity of parallel engines, activity of pipeline stages, and input or output buffer fill level of the FEC decoding. In some examples, the assessment is based on a comparison between the FEC decoding property and reference FEC data.
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公开(公告)号：US20210109563A1
公开(公告)日：2021-04-15
申请号：US16599678
申请日：2019-10-11
摘要： A receiver apparatus comprises circuitry configured for storing a first sequence of values. At the receiver apparatus, a communications signal is received which conveys a second sequence of values, the second sequence of values being related to the first sequence of values. According to some examples, the second sequence of values is identical to the first sequence of values. At the receiver apparatus, P results are calculated from a cross-correlation of the first sequence of values with at least a portion of a representation of the communications signal, where P is a positive integer. According to some examples, P≥2. An estimate of a phase offset of a continuous clock is calculated as a function of the P results. According to some examples, the function is a non-linear function. The estimate of the clock phase offset may be used to achieve clock recovery at the receiver apparatus.
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公开(公告)号：US20120076507A1
公开(公告)日：2012-03-29
申请号：US12893294
申请日：2010-09-29
IPC分类号： H04B10/06
CPC分类号： H04B10/64 , H04B10/613 , H04B10/614
摘要： In a coherent optical receiver of an optical communications system, methods and systems for receiving a data signal x(t) modulated on an optical signal. A linearly polarized LO light is generated, which has a frequency of f1=f0±Δf, where f0 is a frequency of a narrowband carrier of the optical signal, and Δf corresponds with a band-width fB of the data signal x(t). The LO light and a received light of the optical signal are heterodyned on a photodetector. An analog signal generated by the photodetector is low-pass filtered to generate a filtered signal, using a filter characteristic having a sharp cut-off at a frequency of Δf+nfB, where n is an integer multiple. An analog-to digital (A/D) converter samples the filtered signal at a sample rate of 2(Δf+nfB) to generate a corresponding multi-bit digital sample stream. The multi-bit digital sample stream is digitally processed to recover respective In-Phase and Quadrature components of the received light of the optical signal.
摘要翻译： 在光通信系统的相干光接收机中，用于接收在光信号上调制的数据信号x（t）的方法和系统。 产生线偏振的LO光，其具有f1 = f0±＆Dgr; f的频率，其中f0是光信号的窄带载波的频率，＆Dgr; f对应于数据信号的带宽fB x（t）。 LO光和光信号的接收光在光电检测器上被外差。 由光电检测器产生的模拟信号被低通滤波以产生滤波信号，使用具有频率为＆Dgr; f + nfB的尖锐截止频率的滤波器特性，其中n是整数倍。 模数（A / D）转换器以2（＆Dgr; f + nfB）的采样率对滤波后的信号进行采样，以产生相应的多位数字采样流。 数字处理多位数字采样流以恢复光信号的接收光的各自的同相和正交分量。
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公开(公告)号：US20190052403A1
公开(公告)日：2019-02-14
申请号：US15672434
申请日：2017-08-09
CPC分类号： H04L1/0066 , G06F17/156 , G06F17/18 , H03M13/253 , H03M13/29 , H03M13/2948 , H04L1/00 , H04L1/0041 , H04L1/0045 , H04L1/0063 , H04L1/0064
摘要： In data communications, a suitably designed contrast coding scheme, comprising a process of contrast encoding at a transmitter end and a process of contrast decoding at a receiver end, may be used to adjust the contrast in bit error rate (BER) experienced by different classes of bits. Contrast coding may be used to tune the BERs experienced by different subsets of bits, relative to each other, to better match a plurality of forward error correction (FEC) schemes used for transmission of information bits, which may ultimately provide a communications system having a higher noise tolerance, or greater data capacity, or smaller size, or lower heat.
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6.发明申请公开(公告)号：US20170012704A1
公开(公告)日：2017-01-12
申请号：US14794944
申请日：2015-07-09
IPC分类号： H04B10/2507 , H04B10/61
CPC分类号： H04B10/2507 , H04B10/697 , H04L27/2634
摘要： In a communications system having an analog channel configured to convey a data signal from a transmitter to a receiver, a method of mitigating narrow-band impairment imposed by the analog channel on the data signal within a bounded spectral region of a spectrum of the data signal. A transmitter digital signal processor (Tx DSP) applying a first adaptation function to the data signal prior to transmitting the data signal through the analog channel. A receiver digital signal processor (Rx DSP) applying a second adaptation function to the data signal received through the analog channel. The first and second adaptation functions are selected to cooperatively mitigate effects of the narrow-band impairment imposed by the analog channel.
摘要翻译： 在具有被配置为将数据信号从发射机传送到接收机的模拟信道的通信系统中，减少由模拟信道施加的窄带损伤对数据信号的频谱的有界频谱区域内的数据信号的方法 。 发射机数字信号处理器（Tx DSP），在通过模拟信道发送数据信号之前，将第一适应功能应用于数据信号。 接收机数字信号处理器（Rx DSP），将第二适配功能应用于通过模拟通道接收的数据信号。 选择第一和第二适配功能以协同地减轻由模拟通道施加的窄带损伤的影响。
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7.发明申请OPTICAL MODULATION SCHEMES HAVING REDUCED NONLINEAR OPTICAL TRANSMISSION IMPAIRMENTS 有权具有减少非线性光传输损害的光学调制方案公开(公告)号：US20140133865A1
公开(公告)日：2014-05-15
申请号：US13969694
申请日：2013-08-19
申请人： Michael Andrew REIMER , Andrew D. SHINER , Shahab OVEIS GHARAN , Mahmoud TAHERZADEHBOROUJENI , Maurice O'SULLIVAN , Kim B. ROBERTS
发明人： Michael Andrew REIMER , Andrew D. SHINER , Shahab OVEIS GHARAN , Mahmoud TAHERZADEHBOROUJENI , Maurice O'SULLIVAN , Kim B. ROBERTS
IPC分类号： H04B10/532
CPC分类号： H04B10/532 , H04B10/516
摘要： A method of transmitting a data signal using an optical transmitter of an optical communications system. The optical transmitter is configured to modulate an optical carrier in successive signalling intervals to generate an optical signal. A modulation scheme is provided which comprises a multi-dimensional symbol constellation. The modulation scheme is designed such that an average degree of polarization of a modulated optical signal output from the optical transmitter has a first value when averaged across a first signalling interval, and has a second value when averaged across more than one and fewer than 100 signalling intervals. The second value is less than 10 percent of the first value. During run-time, an encoder of the optical transmitter encoding a data signal to be transmitted as symbols of the constellation, and a modulator of the optical transmitter modulating available dimensions of the optical carrier in accordance with the symbols.
摘要翻译： 一种使用光通信系统的光发射机发送数据信号的方法。 光发射机被配置为在连续的信令间隔中调制光载波以产生光信号。 提供了一种包括多维符号星座的调制方案。 调制方案被设计成使得当从第一信令间隔平均时，从光发送器输出的调制光信号的平均偏振度具有第一值，并且当平均多于一个且少于100个信令时具有第二值 间隔 第二个值小于第一个值的10％。 在运行时间期间，光发送器的编码器编码要作为星座符号发送的数据信号，以及根据符号调制光载波的可用尺寸的光发射机的调制器。
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公开(公告)号：US20210234634A1
公开(公告)日：2021-07-29
申请号：US17226287
申请日：2021-04-09
摘要： A method performed at an electronic device comprises receiving information bits, a first nub, and a second nub, each nub comprising redundant values; calculating first calculated determiners from first subsets of the information bits along a first dimension; calculating first corrected determiners by applying first FEC decoding to a combination of the first calculated determiners and the first nub; correcting at least one error in the information bits using a difference between the first corrected determiners and the first calculated determiners; calculating second calculated determiners from second subsets of the information bits along a second dimension that differs from the first dimension; calculating second corrected determiners by applying second FEC decoding to a combination of the second calculated determiners and the second nub; and correcting at least one additional error in the information bits using a difference between the second corrected determiners and the second calculated determiners.
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公开(公告)号：US20190081730A1
公开(公告)日：2019-03-14
申请号：US15703180
申请日：2017-09-13
摘要： Compression coding techniques are proposed for use with forward error correction (FEC) coding, which may provide higher information rates by reducing the proportion of redundant bits relative to information bits that are transmitted from a transmitter to a receiver. In one example, the transmitter calculates a plurality of determiners from a set of information bits, where each determiner is calculated as a first function of a respective first subset of the information bits. The transmitter then calculates a nub as a second function of the plurality of determiners, where the nub comprises a number of redundant bits that is less than a number of bits comprised in the plurality of determiners. The set of information bits is transmitted to the receiver in a first manner, and the nub is transmitted to the receiver in a second manner, where the first manner may be distinct from the second manner.
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公开(公告)号：US20170093528A1
公开(公告)日：2017-03-30
申请号：US15378834
申请日：2016-12-14
CPC分类号： H04L1/0063 , G06F11/10 , H03M13/152 , H03M13/2915 , H03M13/2918 , H03M13/2921 , H03M13/2945 , H03M13/2963 , H04L1/0045
摘要： Forward Error Correction technique: parity vectors are computed such that each parity vector spans multiple FEC frames; in a given FEC frame, a first set of syndrome bits are due to the parity vectors, and a second set of syndrome bits satisfy FEC equations that involve bits of the given FEC frame including the first set of syndrome bits; and the parity vectors are staggered with respect to any sequence in which the FEC frames are processed. Values of decoded bits of a first frame are deduced from known bits of a first parity vector having an effective length of one frame. For parity vectors having an effective length greater than one frame, a Log Likelihood Ratio of each unknown bit associated with the first frame is updated based on known and unknown bits of each parity vector. First frame is decoded using deduced bit values and updated LLR values.
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