Patents by Inventor Giancarlo Gavioli
Giancarlo Gavioli has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 12126483Abstract: 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.Type: GrantFiled: November 16, 2022Date of Patent: October 22, 2024Assignee: Nokia Solutions and Networks OyInventors: Giancarlo Gavioli, Luca Gabriele Razzetti, Carlo Costantini, Andreas Leven
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Patent number: 12074612Abstract: A low-density parity-check (LDPC) decoder comprising a pre-processor, a core decoder, and a post-processor. The pre-processor is configured to transform a received log-likelihood-ratio (LLR) sequence into a form that enables the core decoder to toggle at a reduced rate during iterative decoding processing thereof. Upon stoppage of the decoding processing corresponding to the LLR sequence, the post-processor operates to apply a complementary transformation to the output of the core decoder, which recovers the corresponding codeword of the LDPC code. An example embodiment of the LDPC decoder operating in this manner may be able to beneficially reduce the power consumption therein by about 10%.Type: GrantFiled: January 24, 2023Date of Patent: August 27, 2024Assignee: Nokia Solutions and Networks OyInventors: Daniele Cucchi, Davide Cattaneo, Luca Gabriele Razzetti, Carlo Constantini, Giancarlo Gavioli
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Publication number: 20240259109Abstract: 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.Type: ApplicationFiled: January 24, 2024Publication date: August 1, 2024Applicant: Nokia Solutions and Networks OYInventors: Domenico Marsella, Andrea Carnio, Luca Gabriele Razzetti, Carlo Costantini, Giancarlo Gavioli
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Publication number: 20230403029Abstract: 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.Type: ApplicationFiled: June 6, 2023Publication date: December 14, 2023Applicant: Nokia Solutions and Networks OyInventors: Marco Ferrari, Alberto Tarable, Luca Barletta, Giancarlo Gavioli, Luca Gabriele Razzetti, Carlo Costantini, Sara Caobianco, Daniele Cucchi, Davide Cattaneo
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Publication number: 20230238983Abstract: A low-density parity-check (LDPC) decoder comprising a pre-processor, a core decoder, and a post-processor. The pre-processor is configured to transform a received log-likelihood-ratio (LLR) sequence into a form that enables the core decoder to toggle at a reduced rate during iterative decoding processing thereof. Upon stoppage of the decoding processing corresponding to the LLR sequence, the post-processor operates to apply a complementary transformation to the output of the core decoder, which recovers the corresponding codeword of the LDPC code. An example embodiment of the LDPC decoder operating in this manner may be able to beneficially reduce the power consumption therein by about 10%.Type: ApplicationFiled: January 24, 2023Publication date: July 27, 2023Inventors: Daniele Cucchi, Davide Cattaneo, Luca Gabriele Razzetti, Carlo Constantini, Giancarlo Gavioli
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Patent number: 11082266Abstract: 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.Type: GrantFiled: March 4, 2020Date of Patent: August 3, 2021Assignee: Nokia Solutions and Networks OYInventors: Luca Gabriele Razzetti, Giancarlo Gavioli, Carlo Costantini, Sara Caobianco
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Publication number: 20200287756Abstract: 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.Type: ApplicationFiled: March 4, 2020Publication date: September 10, 2020Inventors: Luca Gabriele Razzetti, Giancarlo Gavioli, Carlo Costantini, Sara Caobianco
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Patent number: 10756822Abstract: 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.Type: GrantFiled: August 27, 2019Date of Patent: August 25, 2020Assignee: Nokia Solutions and Networks OyInventors: Domenico Marsella, Carlo Costantini, Luca Gabriele Razzetti, Giancarlo Gavioli
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Publication number: 20190334558Abstract: The application is related to a forward error correction mechanism in an optical coherent communication system (CS) comprising a FEC encoder (FE) and a FEC decoder (FD) on the basis of a low density parity check, LDPC, code. The FEC encoder encodes blocks of client bits into codewords by adding parity bits calculated by applying a FEC code to the client bits. Besides, the FEC decoder decodes each codeword by applying thereto an iterative message-passing algorithm, each iteration of the message-passing algorithm comprising evaluating a parity-check matrix defining the FEC code. At the FEC encoder, the coding rate of the FEC code may be varied by varying the number of client/information bits per codeword and/or the number of parity bits per codeword. At the FEC decoder, the parity-check matrix is evaluated column by column at each iteration of the message-passing algorithm. The decoder may be a belief propagation decoder.Type: ApplicationFiled: April 20, 2017Publication date: October 31, 2019Applicant: Alcatel LucentInventors: Luca RAZZETTI, Giancarlo GAVIOLI, Carlo COSTANTINI, Davide CATTANEO
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Patent number: 10193568Abstract: It is disclosed an optical coherent receiver comprising a number of decoding blocks configured to implement iterations of a FEC iterative message-passing decoding algorithm. The decoding blocks are distributed into two (or more) parallel chains of cascaded decoding blocks. The receiver also comprises an intermediate circuit interposed between the two parallel chains. The optical coherent receiver is switchable between (i) a first operating mode, in which the intermediate circuit is inactive and the two parallel chains separately implement the FEC message-passing decoding algorithm on respective client channels; and (ii) a second operating mode, in which the intermediate circuit is active and the two parallel chains jointly implement the FEC message-passing decoding algorithm on a same client channel, by cooperating through the intermediate circuit.Type: GrantFiled: August 5, 2015Date of Patent: January 29, 2019Assignee: Alcatel LucentInventors: Luca Razzetti, Giancarlo Gavioli, Carlo Constantini, Marianna Pepe
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Publication number: 20170244515Abstract: It is disclosed an optical coherent receiver comprising a number of decoding blocks configured to implement iterations of a FEC iterative message-passing decoding algorithm. The decoding blocks are distributed into two (or more) parallel chains of cascaded decoding blocks. The receiver also comprises an intermediate circuit interposed between the two parallel chains. The optical coherent receiver is switchable between (i) a first operating mode, in which the intermediate circuit is inactive and the two parallel chains separately implement the FEC message-passing decoding algorithm on respective client channels; and (ii) a second operating mode, in which the intermediate circuit is active and the two parallel chains jointly implement the FEC message-passing decoding algorithm on a same client channel, by cooperating through the intermediate circuit.Type: ApplicationFiled: August 5, 2015Publication date: August 24, 2017Applicant: Alcatel LucentInventors: Luca Razzetti, Giancarlo Gavioli, Carlo Constantini, Marianna Pepe
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Patent number: 9264146Abstract: Embodiments of the disclosure include a method and apparatus for detecting and removing cycle slip. A phase-modulated signal having a plurality of phase-modulated symbols is received at an optical receiver, and, for each phase-modulated symbol, a phase-error estimate of a phase error of the phase-modulated symbol is generated. The presence of a cycle slip is then detected based on the phase-error estimates, and, a phase of each of one or more of the received phase-modulated symbols is adjusted to remove the detected cycle slip without adjusting a local oscillator.Type: GrantFiled: January 30, 2014Date of Patent: February 16, 2016Assignee: Alcatel LucentInventors: Xiang Liu, Chandrasekhar Sethumadhavan, Timo Pfau, Giancarlo Gavioli
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Publication number: 20150215050Abstract: Embodiments of the disclosure include a method and apparatus for detecting and removing cycle slip. A phase-modulated signal having a plurality of phase-modulated symbols is received at an optical receiver, and, for each phase-modulated symbol, a phase-error estimate of a phase error of the phase-modulated symbol is generated. The presence of a cycle slip is then detected based on the phase-error estimates, and, a phase of each of one or more of the received phase-modulated symbols is adjusted to remove the detected cycle slip without adjusting a local oscillator.Type: ApplicationFiled: January 30, 2014Publication date: July 30, 2015Applicant: Alcatel LucentInventors: Xiang Liu, Chandrasekhar Sethumadhavan, Timo Pfau, Giancarlo Gavioli
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POLARIZATION STABILIZATION SCHEME FOR UN-COOLED SELF-TUNING CAVITY FOR COLORLESS ULTRA BROADBAND PON
Publication number: 20140029945Abstract: An optical transmitter for a WDM (Wavelength Division Multiplexing) passive optical network (PON) and a WDM PON comprising such an optical transmitter are disclosed. An optical transmitter comprises first mirror and second mirrors at first end and second ends of a cavity; an optical amplifier positioned within the cavity upstream from the first mirror and for amplifying light polarized in a first polarization plane; an optical waveguide for transmitting light from the optical amplifier to the second mirror and vice versa; a first non-reciprocal polarization rotator upstream of the optical amplifier and downstream of the optical waveguide; and a second non-reciprocal polarization rotator upstream of the optical waveguide and downstream of the first mirror; wherein the first and second non-reciprocal polarization rotators rotate the polarization of the light such that light which re-enters the optical amplifier after having been reflected by the second mirror is polarized in the first polarization plane.Type: ApplicationFiled: April 13, 2012Publication date: January 30, 2014Inventors: Mario Martinelli, Giancarlo Gavioli, Paola Galli, Domenico Di Mola, Paola Parolari, Lucia Marazzi, Luca Razzetti, Luca Suberini, Domenico Campi