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21. 发明授权

US08983309B2 Constrained continuous phase modulation and demodulation in an optical communications system 有权
标题翻译：光通信系统中的约束连续相位调制和解调
公开(公告)号：US08983309B2
公开(公告)日：2015-03-17
申请号：US13371846
申请日：2012-02-13
申请人： James Harley , Douglas McGhan , Shahab Oveis Gharan , Kim B. Roberts , Mark Rollins
发明人： James Harley , Douglas McGhan , Shahab Oveis Gharan , Kim B. Roberts , Mark Rollins
IPC分类号： H04B10/06 , H04B10/04
CPC分类号： H04B10/5561
摘要： A transmitter in an optical communications system includes a digital signal processor for processing a data signal to generate a sample stream encoding successive symbols in accordance with a constrained phase modulation scheme having a constellation of at least two symbols and a modulation phase constrained to a phase range spanning less than 4π. A digital-to-analog converter converts the sample stream into a corresponding analog drive signal. A finite range phase modulator modulates a phase of a continuous wavelength channel light in accordance with the analog drive signal, to generate a modulated channel light for transmission through the optical communications system. A receiver in the optical communications system includes an optical stage for detecting phase and amplitude of the modulated channel light and for generating a corresponding sample stream, and a digital signal processor for processing the sample stream to estimate each successive symbol of the modulated channel light.
摘要翻译：光通信系统中的发射机包括数字信号处理器，用于处理数据信号以产生根据具有至少两个符号的星座的约束相位调制方案编码连续码元的采样流，以及限制为相位范围的调制相位跨度小于4＆pgr。数模转换器将采样流转换成相应的模拟驱动信号。有限范围相位调制器根据模拟驱动信号调制连续波长信道光的相位，以产生用于通过光通信系统传输的调制信道光。光通信系统中的接收机包括用于检测调制信道光的相位和幅度并用于产生相应样本流的光学级，以及用于处理样本流以估计调制信道光的每个连续符号的数字信号处理器。

22. 发明授权

US11233523B1 Digital-to-analog conversion with sign modulation 有权
公开(公告)号：US11233523B1
公开(公告)日：2022-01-25
申请号：US17158373
申请日：2021-01-26
申请人： Shahab Oveis Gharan , Ian Roberts , Yuriy Greshishchev , Naim Ben-Hamida , Kim B. Roberts
发明人： Shahab Oveis Gharan , Ian Roberts , Yuriy Greshishchev , Naim Ben-Hamida , Kim B. Roberts
IPC分类号： H03M1/66 , H03M1/82
摘要： An apparatus is configured to generate, from a stream of periodic digital samples, a first sub-stream of periodic analog samples and a second sub-stream of periodic analog samples, each sub-stream comprising substantially stable time intervals. The apparatus is further configured to generate a sign-modulated sub-stream by applying to the second sub-stream a sign modulation operation effecting a sign transition during a stable time interval of the second sub-stream. The apparatus is further configured to generate an output stream of periodic analog samples based on a sum of the first sub-stream and the sign-modulated sub-stream, wherein a period of the output stream is shorter than periods of the first and second sub-streams.

23. 发明授权

US10992416B2 Forward error correction with compression coding 有权
公开(公告)号：US10992416B2
公开(公告)日：2021-04-27
申请号：US16802129
申请日：2020-02-26
申请人： Shahab Oveis Gharan , Mohammad Ehsan Seifi , Kim B. Roberts
发明人： Shahab Oveis Gharan , Mohammad Ehsan Seifi , Kim B. Roberts
IPC分类号： H04L1/00 , H03M13/00 , H03M13/29 , H03M13/15
摘要： Compression coding may be used with forward error correction (FEC) coding to 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, first determiners and second determiners are calculated from a set of information bits, where each first determiner is calculated from a different first subset of the information bits along a first dimension, and each second determiner is calculated from a different second subset of the information bits along a second dimension that differs from the first dimension. First and second nubs are calculated from the first and second determiners, respectively, each nub comprising a number of redundant bits that is less than the number of bits in the determiners from which the nub is calculated. The information bits and the nubs are transmitted over one or more communications channels.

24. 发明授权

US10938483B1 Training-aided feedforward channel equalization 有权
公开(公告)号：US10938483B1
公开(公告)日：2021-03-02
申请号：US16903792
申请日：2020-06-17
申请人： Ramin Babaee , Shahab Oveis Gharan , Martin Bouchard , Kim B. Roberts
发明人： Ramin Babaee , Shahab Oveis Gharan , Martin Bouchard , Kim B. Roberts
IPC分类号： H04B10/61 , H04B10/69
摘要： An optical signal modulated with a stream of symbols comprising a sequence of training symbols is received at a receiver. First equalizer circuitry calculates and applies first coefficients to digital signals representative of the optical signal, thereby resulting in first compensated signals. Second equalizer circuitry calculates second coefficients based on a correlation between the first compensated signals and digital signals representative of the sequence of training symbols and applies the second coefficients to the first compensated signals, thereby resulting in second compensated signals. Third equalizer circuitry calculates and applies third coefficients to the second compensated signals, thereby resulting in third compensated signals. The first, second, and third coefficients compensate for impairments in the optical signal varying at respective first, second, and third rates, where the third rate is higher than the first rate and lower than the second rate.

25. 发明授权

US10615913B2 Forward error correction with compression coding 有权
公开(公告)号：US10615913B2
公开(公告)日：2020-04-07
申请号：US15703180
申请日：2017-09-13
申请人： Shahab Oveis Gharan , Mohammad Ehsan Seifi , Kim B. Roberts
发明人： Shahab Oveis Gharan , Mohammad Ehsan Seifi , Kim B. Roberts
IPC分类号： H04L1/00 , H03M13/00 , H03M13/29 , H03M13/15
CPC分类号： H04L1/0057 , H03M13/2906 , H03M13/2942 , H03M13/6312 , H04L1/0041 , H04L1/0065 , H03M13/152 , H03M13/1515
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.

26. 发明授权

US10389447B1 Dimensional transformation 有权
公开(公告)号：US10389447B1
公开(公告)日：2019-08-20
申请号：US16003736
申请日：2018-06-08
申请人： Amir Khandani , Shahab Oveis Gharan , Michael Andrew Reimer , Maurice O'Sullivan , Kim B. Roberts
发明人： Amir Khandani , Shahab Oveis Gharan , Michael Andrew Reimer , Maurice O'Sullivan , Kim B. Roberts
IPC分类号： H04L1/00 , H04L1/20 , H04B10/60 , H04L25/03 , H04B10/2543 , H04B10/40 , H04B10/50
摘要： A receiver may receive an optical signal over an optical communications channel established between the receiver and a transmitter, the received optical signal comprising a degraded version of a modulated optical signal generated at the transmitter. The receiver may determine received digital signals corresponding to a plurality of first dimensions of the received optical signal, wherein the first dimensions correspond to dimensions of an optical carrier modulated at the transmitter to represent a multi-bit symbol, and wherein the first dimensions are distributed over two or more timeslots. The receiver may determine preliminary digital drive signal estimates using an inverse dimensional transformation and the received digital signals, the preliminary digital drive signal estimates corresponding to a plurality of second dimensions. The receiver may determine an estimate of the multi-bit symbol using the preliminary digital drive signal estimates. The inverse dimensional transformation may average signal degradations in the received digital signals.

27. 发明授权

US10367600B2 Forward error correction with contrast coding 有权
公开(公告)号：US10367600B2
公开(公告)日：2019-07-30
申请号：US15672434
申请日：2017-08-09
申请人： Shahab Oveis Gharan , Mohammad Ehsan Seifi , Kim B. Roberts
发明人： Shahab Oveis Gharan , Mohammad Ehsan Seifi , Kim B. Roberts
IPC分类号： H04L1/00 , G06F17/18 , H03M13/25 , H03M13/29 , G06F17/15
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.

28. 发明授权

US09831987B2 Staggered parity 有权
公开(公告)号：US09831987B2
公开(公告)日：2017-11-28
申请号：US15378834
申请日：2016-12-14
申请人： Shahab Oveis Gharan , James Harley , Kim B. Roberts
发明人： Shahab Oveis Gharan , James Harley , Kim B. Roberts
IPC分类号： H04L1/00 , G06F11/10 , H03M13/15 , H03M13/29
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.

29. 发明授权

US09537608B2 Staggered parity 有权
标题翻译：交错平价
公开(公告)号：US09537608B2
公开(公告)日：2017-01-03
申请号：US14564195
申请日：2014-12-09
申请人： Shahab Oveis Gharan , James Harley , Kim B. Roberts
发明人： Shahab Oveis Gharan , James Harley , Kim B. Roberts
IPC分类号： G06F11/00 , H03M13/00 , H04L1/00 , G06F11/10 , H03M13/29 , H03M13/15
CPC分类号： H04L1/0063 , G06F11/10 , H03M13/152 , H03M13/2915 , H03M13/2918 , H03M13/2921 , H03M13/2945 , H03M13/2963 , H04L1/0045
摘要： In a Forward Error Correction (FEC) technique, parity vectors are computed such that: each parity vector spans a set of frames; a subset of bits of each frame is associated with parity bits in each parity vector; and a location of parity bits associated with one frame in one parity vector is different from that of parity bits associated with the frame in another parity vector. Values of decoded bits of a first frame are deduced from known parity 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 parity bit associated with the first frame is updated based on known and unknown parity bits of each parity vector. The first frame is decoded using the deduced bit values and the updated LLR values.
摘要翻译：在前向纠错（FEC）技术中，计算奇偶校验向量，使得：每个奇偶校验向量跨越一组帧; 每个帧的比特的子集与每个奇偶校验向量中的奇偶校验位相关联; 并且与一个奇偶校验向量中的一帧相关联的奇偶校验位的位置与在另一个奇偶校验向量中与该帧相关联的奇偶校验位的位置不同。从具有一帧的有效长度的第一奇偶校验向量的已知奇偶校验位推导第一帧的解码比特的值。对于具有大于一帧的有效长度的奇偶校验向量，基于每个奇偶校验向量的已知和未知奇偶校验位来更新与第一帧相关联的每个未知奇偶校验位的对数似然比。使用推导的比特值和更新的LLR值对第一帧进行解码。

30. 发明授权

US08818209B1 System and apparatus for distributing a signal to the front end of a multipath analog to digital converter 有权
标题翻译：用于将信号分配到多路径模数转换器的前端的系统和装置
公开(公告)号：US08818209B1
公开(公告)日：2014-08-26
申请号：US13526965
申请日：2012-06-19
申请人： William Martin Snelgrove , Kim B. Roberts , Bertram Leesti , Shahab Oveis Gharan , Mahmoud Taherzadehboroujeni
发明人： William Martin Snelgrove , Kim B. Roberts , Bertram Leesti , Shahab Oveis Gharan , Mahmoud Taherzadehboroujeni
IPC分类号： H04B10/06
CPC分类号： H04B10/616
摘要： A frequency decimation block for processing an analog input signal including a high-bandwidth data signal to generate a parallel set of parallel output signals, in which each output signal represents a respective portion of the high-bandwidth data signal. A preamplifier is provided for amplifying the input signal. A frequency domain divider divides the amplified input signal to generate a set of frequency band signals including a low frequency band signal, a mid-frequency band signal, and a high frequency band signal. Each frequency band signal is supplied to at least one signal path. A respective non-linear processor is connected in each of M signal paths processes the input signal using a respective branch signal to yield a corresponding composite signal. A respective Low-Pass Filter (LPF) is connected in each signal path, for low-pass filtering at least the composite signals to generate corresponding ones of the parallel output signals.
摘要翻译：一种用于处理包括高带宽数据信号的模拟输入信号以产生并行的并行输出信号的频率抽取块，其中每个输出信号表示高带宽数据信号的相应部分。提供用于放大输入信号的前置放大器。频域分频器对放大的输入信号进行分频，以产生包括低频带信号，中频带信号和高频带信号的一组频带信号。每个频带信号被提供给至少一个信号路径。在M个信号路径的每一个中连接相应的非线性处理器，使用相应的分支信号处理输入信号，以产生相应的复合信号。相应的低通滤波器（LPF）连接在每个信号路径中，用于至少对复合信号进行低通滤波以产生对应的并行输出信号。

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