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公开(公告)号：US10756822B1
公开(公告)日：2020-08-25
申请号：US16553142
申请日：2019-08-27
Applicant: Nokia Solutions and Networks Oy
Inventor： Domenico Marsella , Carlo Costantini , Luca Gabriele Razzetti , Giancarlo Gavioli
IPC: H04B10/00 , H04B10/61 , H04B10/079 , H04J14/00
Abstract: An apparatus includes a digital signal processor to perform perturbation-based optical nonlinearity compensation of optical data signals of a communication stream. The digital signal processor includes first digital circuits to calculate multiplicative factors for corrections to the optical data signals from products of values of the optical data signals at a reduced set of times. The reduced set is a down-sampling of the sequence of consecutive symbol times of the communication stream. The digital signal processor also includes second digital circuits to calculate the multiplicative factors for corrections to the optical data signals at the consecutive symbol times by interpolating the multiplicative factors evaluated at the reduced set of times.
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公开(公告)号：US20230403029A1
公开(公告)日：2023-12-14
申请号：US18206161
申请日：2023-06-06
Applicant: Nokia Solutions and Networks Oy
Inventor： Marco Ferrari , Alberto Tarable , Luca Barletta , Giancarlo Gavioli , Luca Gabriele Razzetti , Carlo Costantini , Sara Caobianco , Daniele Cucchi , Davide Cattaneo
IPC: H03M13/11
CPC classification number: H03M13/1105 , H03M13/1151
Abstract: A method and apparatus are provided for decoding a plurality of codewords from a received binary bitstream. A first decoding stage processes each of the codewords with a first iterative decoding algorithm based on forward error-correction information of the codewords. A second decoding stage processes selected ones of the codewords with a second iterative decoding algorithm, which is based on forward error-correction information in the selected ones of the codewords. Each codeword selected for the second decoding stage is selected in response to an exit from the decoding of that codeword without the production of a decoded codeword. The second iterative decoding algorithm is configured to enable a greater number of iterations of decoding per codeword than the first iterative decoding algorithm.
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Patent Agency Ranking
公开(公告)号：US20190334627A1
公开(公告)日：2019-10-31
申请号：US15966697
申请日：2018-04-30
Applicant: Nokia Solutions and Networks OY
Inventor： Noriaki Kaneda , Stephan Weisser , Carlo Costantini
Abstract: A coherent optical receiver in which the channel equalizer and the clock-recovery circuit are connected in a nested-loop configuration, wherein the channel estimate generated by the equalizer is used to adjust the phase of the clock signal generated by the clock-recovery circuit. The channel equalizer can be implemented using a bank of time-domain or frequency-domain FIR filters. In an example embodiment, the clock-recovery circuit is configured to track the phase rotation corresponding to the equalized signals in a frequency-dependent manner; track the phase rotation in the channel equalizer either in a frequency-dependent manner or based on the mean signal delay therein; and adjust the phase of the clock signal based on an effective difference between these two phase rotations. The clock-recovery circuit enhances the clock tone by applying a Fourier transform to the squared absolute values of the equalized signals outputted by the channel equalizer.
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公开(公告)号：US20200287756A1
公开(公告)日：2020-09-10
申请号：US16808433
申请日：2020-03-04
Applicant: Nokia Solutions and Networks Oy
Inventor： Luca Gabriele Razzetti , Giancarlo Gavioli , Carlo Costantini , Sara Caobianco
Abstract: An apparatus, comprising: circuitry configured, in response to receipt of input data, to transmit a stream of symbols of a constellation to a modulator for modulation onto a carrier wherein a frequency of occurrence of symbols in the stream is dependent upon a probability-amplitude distribution for symbols of the constellation, wherein the probability-amplitude distribution has a kurtosis less than a target value and a shape of the probability-amplitude distribution causes low-amplitude symbols to occur more frequently on average in the stream than high-amplitude symbols.
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公开(公告)号：US12126483B2
公开(公告)日：2024-10-22
申请号：US17988332
申请日：2022-11-16
Applicant: Nokia Solutions and Networks Oy
Inventor： Giancarlo Gavioli , Luca Gabriele Razzetti , Carlo Costantini , Andreas Leven
IPC: H04L27/36 , H04B10/556 , H04L27/34
CPC classification number: H04L27/364 , H04B10/5561 , H04L27/3405 , H04L27/3433 , H04L27/366
Abstract: Architectures for inter-converting bitstreams and symbol streams of PAM and/or QAM constellations of different sizes that are not base-2 integers. Some of such constellations may be Gray-coded, and the constellation mapping may be performed to achieve an equiprobable distribution of different constellation symbols. Some embodiments may be compatible with FEC schemes. In an example embodiment, a transmitter DSP may employ a conventional constellation mapper preceded by an electronic encoder programmed to exclude some constellation-symbol labels from the bitstream applied to the mapper. In different embodiments, the electronic encoder may employ a CCDM and/or a long-division operation to select some amplitudes of the constellation and to exclude others. At least some embodiments are beneficially capable of achieving a smaller gap to the Shannon limit than comparable conventional solutions.
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公开(公告)号：US11082266B2
公开(公告)日：2021-08-03
申请号：US16808433
申请日：2020-03-04
Applicant: Nokia Solutions and Networks Oy
Inventor： Luca Gabriele Razzetti , Giancarlo Gavioli , Carlo Costantini , Sara Caobianco
Abstract: An apparatus, comprising: circuitry configured, in response to receipt of input data, to transmit a stream of symbols of a constellation to a modulator for modulation onto a carrier wherein a frequency of occurrence of symbols in the stream is dependent upon a probability-amplitude distribution for symbols of the constellation, wherein the probability-amplitude distribution has a kurtosis less than a target value and a shape of the probability-amplitude distribution causes low-amplitude symbols to occur more frequently on average in the stream than high-amplitude symbols.
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公开(公告)号：US20240259109A1
公开(公告)日：2024-08-01
申请号：US18421898
申请日：2024-01-24
Applicant: Nokia Solutions and Networks OY
Inventor： Domenico Marsella , Andrea Carnio , Luca Gabriele Razzetti , Carlo Costantini , Giancarlo Gavioli
CPC classification number: H04B10/6163 , H04B10/695
Abstract: A method and apparatus are provided for compensating incoming signals in a receiver of an optical fiber communication system for degradation due to nonlinear optical effects in the transmission channel. The compensation is performed, inter alia, in circuitry to compute perturbation terms that are representative of predicted optical nonlinearity of the transmission channel, and circuitry to combine the perturbation terms with soft data symbols obtained from an input signal stream. The computation of the perturbation terms involves circuitry for converting an input stream of soft data symbols to an input stream of hard data symbols, and then operating on the input stream of hard data symbols according to a model of nonlinear effects in the transmission channel.
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