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公开(公告)号：US11683101B1
公开(公告)日：2023-06-20
申请号：US17534766
申请日：2021-11-24
发明人： Damian Alfonso Morero , Mario Alejandro Castrillon , Ramiro Rogelio Lopez , Cristian Cavenio , Gabriel Infante , Mario Rafael Hueda
CPC分类号： H04B10/616 , H04B10/40 , H04B10/6161 , H04B10/6162 , H04L27/2275 , H04L27/3836 , H04J14/0298
摘要： A method and structure for probabilistic shaping and compensation techniques in coherent optical receivers. According to an example, the present invention provides a method and structure for an implementation of distribution matcher encoders and decoders for probabilistic shaping applications. The techniques involved avoid the traditional implementations based on arithmetic coding, which requires intensive multiplication functions. Furthermore, these probabilistic shaping techniques can be used in combination with LDPC codes through reverse concatenation techniques.
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公开(公告)号：US11190276B2
公开(公告)日：2021-11-30
申请号：US17077755
申请日：2020-10-22
发明人： Damian Alfonso Morero , Mario Alejandro Castrillon , Ramiro Rogelio Lopez , Cristian Cavenio , Gabriel Infante , Mario Rafael Hueda
摘要： A method and structure for probabilistic shaping and compensation techniques in coherent optical receivers. According to an example, the present invention provides a method and structure for an implementation of distribution matcher encoders and decoders for probabilistic shaping applications. The techniques involved avoid the traditional implementations based on arithmetic coding, which requires intensive multiplication functions. Furthermore, these probabilistic shaping techniques can be used in combination with LDPC codes through reverse concatenation techniques.
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公开(公告)号：US11245425B2
公开(公告)日：2022-02-08
申请号：US16904381
申请日：2020-06-17
发明人： Damian Alfonso Morero , Mario Alejandro Castrillon , Matias German Schnidrig , Mario Rafael Hueda
摘要： A communication system includes a transmitter having an encoder configured to encode input data using FEC codewords and a receiver including a decoder configured to decode the FEC codewords using a parity check matrix. The decoder includes check node processing units each configured to perform a check node computation on an FEC codeword using a different row of the parity check matrix. Each of the check node processing units includes an input computation stage configured to compute initial computation values, a pipelined message memory configured to shift the initial computation values at a predefined clock interval, an output computation stage configured to generate a plurality of check node output messages, a plurality of variable node processing units each configured to perform variable node update computations to generate the variable node messages, and an output circuit configured to generate a decoded codeword based on the variable node messages.
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公开(公告)号：US12081274B1
公开(公告)日：2024-09-03
申请号：US18211094
申请日：2023-06-16
申请人： Marvell Asia Pte Ltd
发明人： Damian Alfonso Morero , Mario A. Castrillion , Ramiro Rogelio Lopez , Cristian Cavenio , Gabriel Infante , Mario Rafael Hueda
CPC分类号： H04B10/616 , H04B10/40 , H04B10/6161 , H04B10/6162 , H04L27/2275 , H04L27/3836 , H04J14/0298
摘要： A method and structure for probabilistic shaping and compensation techniques in coherent optical receivers. According to an example, the present invention provides a method and structure for an implementation of distribution matcher encoders and decoders for probabilistic shaping applications. The techniques involved avoid the traditional implementations based on arithmetic coding, which requires intensive multiplication functions. Furthermore, these probabilistic shaping techniques can be used in combination with LDPC codes through reverse concatenation techniques.
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5.发明授权公开(公告)号：US11996896B2
公开(公告)日：2024-05-28
申请号：US17558236
申请日：2021-12-21
CPC分类号： H04B10/6162 , H04B10/079 , H04B10/615 , H04B10/616 , H04B10/6161 , H04B10/6165 , H04L1/0045 , H04L7/0075 , H04L25/03019 , H04L25/03159 , H04L27/2662 , H04L27/2697 , H04B10/40 , H04L27/2634
摘要： A method and structure for equalization in coherent optical receivers. Block-based LMS (BLMS) algorithm is one of the many efficient adaptive equalization algorithms used to (i) increase convergence speed and (ii) reduce implementation complexity. Since the computation of the equalizer output and the gradient of the error are obtained using a linear convolution, BLMS can be efficiently implemented in the frequency domain with the constrained frequency-domain BLMS (FBLMS) adaptive algorithm. The present invention introduces a novel reduced complexity constrained FBLMS algorithm. This new approach replaces the two discrete Fourier transform (DFT) stages required to evaluate the DFT of the gradient error, by a simple frequency domain filtering. Implementation complexity can be drastically reduced in comparison to the standard constrained FBLMS. Furthermore, the new approach achieves better performance than that obtained with the unconstrained FBLMS in ultra-high speed coherent optical receivers.
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公开(公告)号：US11212009B2
公开(公告)日：2021-12-28
申请号：US16808055
申请日：2020-03-03
摘要： A method and structure for equalization in coherent optical receivers. Block-based LMS (BLMS) algorithm is one of the many efficient adaptive equalization algorithms used to (i) increase convergence speed and (ii) reduce implementation complexity. Since the computation of the equalizer output and the gradient of the error are obtained using a linear convolution, BLMS can be efficiently implemented in the frequency domain with the constrained frequency-domain BLMS (FBLMS) adaptive algorithm. The present invention introduces a novel reduced complexity constrained FBLMS algorithm. This new approach replaces the two discrete Fourier transform (DFT) stages required to evaluate the DFT of the gradient error, by a simple frequency domain filtering. Implementation complexity can be drastically reduced in comparison to the standard constrained FBLMS. Furthermore, the new approach achieves better performance than that obtained with the unconstrained FBLMS in ultra-high speed coherent optical receivers.
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