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11. 发明授权

US09071362B1 Noise-tolerant optical modulation 有权
标题翻译：耐噪声光调制
公开(公告)号：US09071362B1
公开(公告)日：2015-06-30
申请号：US13655497
申请日：2012-10-19
申请人： Mahmoud Taherzadehboroujeni , Shahab Oveis Gharan , Kim B. Roberts
发明人： Mahmoud Taherzadehboroujeni , Shahab Oveis Gharan , Kim B. Roberts
IPC分类号： H04B10/04 , H04B10/516
CPC分类号： H04B10/516 , H04B10/5161 , H04B10/532 , H04B10/5561
摘要： A method of transmitting data. The method comprises preliminarily providing a modulation scheme comprising an N-symbol constellation defined in an M-dimensional space, wherein N
摘要翻译：一种传输数据的方法。该方法包括预先提供包括在M维空间中定义的N符号星座的调制方案，其中N <2M，并且星座内给定的一对符号之间的复合距离随着在编码的数据字之间的汉明距离的增加而增加每个符号。在运行时间期间，要发送的数据信号被编码为星座的符号，并且根据符号被调制到载波的至少M个维度上。

12. 发明授权

US11239929B1 Approximation of recursive least squares equalization 有权
公开(公告)号：US11239929B1
公开(公告)日：2022-02-01
申请号：US17203332
申请日：2021-03-16
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： H04B3/46 , H04B17/318
摘要： A receiver is configured to detect, at a communication interface, a received signal that suffers from degradations incurred over a communication channel. The receiver applies an adaptive filter to a series of received blocks of a digital representation of the received signal, thereby generating respective filtered blocks, where each received block represents 2N frequency bins, and where N is a positive integer. The receiver calculates coefficients for use by the adaptive filter on a jth received block as a function of (i) error estimates associated with an (j−D−1)th filtered block, where D is a positive integer representing a number of blocks, and where j is a positive integer greater than (D−1); and (ii) an inverse of an approximate covariance matrix associated with the (j−D−1)th received block, where the approximate covariance matrix is a diagonal matrix of size L×L, and where L is a positive integer lower than 2N.

13. 发明授权

US11233568B1 Feedback equalization with delay compensation 有权
公开(公告)号：US11233568B1
公开(公告)日：2022-01-25
申请号：US17090135
申请日：2020-11-05
申请人： Shahab Oveis Gharan , Ramin Babaee , Martin Bouchard , Kim B. Roberts
发明人： Shahab Oveis Gharan , Ramin Babaee , Martin Bouchard , Kim B. Roberts
IPC分类号： H04B10/06 , H04B10/2507 , H04B10/2569 , H04B10/67 , H04B10/532 , H04B10/69
摘要： A receiver is configured to detect, at a communication interface, a received signal that suffers from degradations incurred over a communication channel. The receiver applies an adaptive filter to a series of received blocks of a digital representation of the received signal, thereby generating respective filtered blocks. The receiver calculates coefficients for use by the adaptive filter on an jth received block as a function of (i) error estimates associated with an (j−D−1)th filtered block, where D is a positive integer representing a number of blocks, and where j is a positive integer greater than (D−1); and (ii) delay compensation terms dependent on an estimate of a difference between coefficients used by the adaptive filter on an (j−D−1)th received block and coefficients used by the adaptive filter on an (j−1)th received block

14. 发明授权

US09461751B2 Frequency domain multiplex optical transmission 有权
标题翻译：频域复用光传输
公开(公告)号：US09461751B2
公开(公告)日：2016-10-04
申请号：US13718211
申请日：2012-12-18
申请人： James Harley , Roger Carroll , Shahab Oveis Gharan , Kim B. Roberts
发明人： James Harley , Roger Carroll , Shahab Oveis Gharan , Kim B. Roberts
IPC分类号： H04B10/548 , H04B10/40 , H04B10/61
CPC分类号： H04B10/516 , H04B10/505 , H04B10/548 , H04B10/616
摘要： A method of transmitting a data signal in an optical communications system. The method includes processing the data signal to generate an analog drive signal, wherein the processing comprises applying a first non-linear operation such that frequency components of the drive signal lay in at least two separated spectral bands. An optical carrier light is modulated using the analog drive signal.
摘要翻译：一种在光通信系统中发送数据信号的方法。该方法包括处理数据信号以产生模拟驱动信号，其中该处理包括施加第一非线性操作，使得驱动信号的频率分量位于至少两个分离的频谱带中。使用模拟驱动信号调制光载波。

15. 发明授权

US08929749B2 Minimum variance carrier recovery 有权
标题翻译：最小方差载波恢复
公开(公告)号：US08929749B2
公开(公告)日：2015-01-06
申请号：US13253331
申请日：2011-10-05
申请人： Kim B. Roberts , Shahab Oveis Gharan , Amir Khandani
发明人： Kim B. Roberts , Shahab Oveis Gharan , Amir Khandani
IPC分类号： H04B10/06 , H04L27/38 , H04B10/61 , H04L27/227
CPC分类号： H04B10/6165 , H04L27/2271 , H04L27/3836
摘要： Methods and systems of data symbol recovery in a coherent optical receiver of an optical communications system. A respective probabilistic phase error is calculated for each of a plurality of data symbol estimates. A phase rotation is calculated based on the probabilistic phase error estimates, using a filter function, and the phase rotation applied to at least one data symbol estimate to generate a corresponding rotated symbol estimate. Each rotated symbol estimate is processed to generate corresponding decision values of each data symbol.
摘要翻译：光通信系统的相干光接收机中数据符号恢复的方法和系统。针对多个数据符号估计中的每一个计算相应的概率相位误差。基于使用滤波函数的概率相位误差估计，以及施加到至少一个数据符号估计的相位旋转来生成相应的旋转符号估计来计算相位旋转。处理每个旋转的符号估计以产生每个数据符号的相应决定值。

16. 发明授权

US08805206B2 Single pin coherent receiver 有权
标题翻译：单针相干接收机
公开(公告)号：US08805206B2
公开(公告)日：2014-08-12
申请号：US12893294
申请日：2010-09-29
申请人： Kim B. Roberts , Shahab Oveis Gharan
发明人： Kim B. Roberts , Shahab Oveis Gharan
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。

17. 发明授权

US11070312B1 Compression forward error correction coding using a tree structure 有权
公开(公告)号：US11070312B1
公开(公告)日：2021-07-20
申请号：US16916282
申请日：2020-06-30
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 , H03M13/13 , H03M13/11
摘要： A transmitter generates determiners from data vectors representing payload information, each determiner representing parity information dependent on the payload information. The transmitter encodes the determiners to generate a nub vector representing compressed parity information dependent on the parity information, wherein the encoding is mathematically equivalent to calculating three or more forward error correction (FEC) codewords from the determiners and then calculating the nub vector from the codewords, at least one of the codewords being calculated from at least one recursion of a mathematical operation, and at least one of the codewords comprising more than 6 terms. The transmitter transmits signals representing the data vectors and the nub vector to a receiver, where recovery of the data vectors at the receiver involves sequential decoding of the FEC codewords, wherein at least one codeword decoded earlier in the decoding enhances an estimate of at least one codeword decoded later in the decoding.

18. 发明授权

US10211919B2 Mitigation of narrow-band degradations in a broadband communication system 有权
公开(公告)号：US10211919B2
公开(公告)日：2019-02-19
申请号：US14794944
申请日：2015-07-09
申请人： Shahab Oveis Gharan , Kim B. Roberts
发明人： Shahab Oveis Gharan , Kim B. Roberts
IPC分类号： H04B10/69 , H04L27/26 , H04B10/2507
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.

19. 发明授权

US09859984B2 Frequency domain multiplex optical transmission 有权
公开(公告)号：US09859984B2
公开(公告)日：2018-01-02
申请号：US15281986
申请日：2016-09-30
申请人： James Harley , Roger Carroll , Shahab Oveis Gharan , Kim B. Roberts
发明人： James Harley , Roger Carroll , Shahab Oveis Gharan , Kim B. Roberts
IPC分类号： H04B10/516 , H04B10/50 , H04B10/61 , H04B10/548
CPC分类号： H04B10/516 , H04B10/505 , H04B10/548 , H04B10/616
摘要： A transmitter comprises a complex mixer to generate a single I analog drive signal and a single Q analog drive signal, and a single multi-dimensional optical modulator configured to modulate an optical carrier light using the single I analog drive signal and the single Q analog drive signal to produce a modulated optical signal for transmission. Alternatively, a transmitter comprises a complex mixer to generate two I analog drive signals and two Q analog drive signals, and a single multi-dimensional multiple-electrode optical modulator configured to modulate an optical carrier light using the analog drive signals to produce a modulated optical signal for transmission. In both transmitters, the optical carrier light is produced by a single laser, and frequency components of the first data signal are located in a different portion of a spectrum of the modulated optical signal than frequency components of the second data signal.

20. 发明授权

US09325427B1 Maximum likelihood decoding 有权
标题翻译：最大似然解码
公开(公告)号：US09325427B1
公开(公告)日：2016-04-26
申请号：US13664576
申请日：2012-10-31
申请人： Shahab Oveis Gharan , Kim B. Roberts , Mahmoud Taherzadehboroujeni
发明人： Shahab Oveis Gharan , Kim B. Roberts , Mahmoud Taherzadehboroujeni
IPC分类号： H04B10/69 , H04B10/61
CPC分类号： H04B10/695 , H04B10/612 , H04B10/613 , H04B10/614 , H04B10/616 , H04B10/697 , H04L1/0054
摘要： In a coherent receiver of an optical communication system, a method of processing a detected symbol estimate to determine a most likely value of a corresponding transmitted data word, the transmitted data word comprising one or more data bits encoded in a transmitter using a predetermined constellation of at least two symbols. A set of two or more virtual constellation points are define in a decision region corresponding to a possible value of the data word. The detected symbol estimate is processed to find a most likely virtual constellation point given the detected symbol estimate. The most likely value of the corresponding transmitted data word is determined based on the most likely virtual constellation point.
摘要翻译：在光通信系统的相干接收机中，处理检测到的符号估计以确定对应的发送数据字的最可能值的方法，所发送的数据字包括使用预定的星座图的发送机中编码的一个或多个数据比特至少两个符号。在与数据字的可能值相对应的判定区域中定义一组两个或更多个虚拟星座点。处理检测到的符号估计以找到给定检测到的符号估计的最可能的虚拟星座点。基于最可能的虚拟星座点来确定对应的传输数据字的最可能的值。

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