公开(公告)号：US20240014930A1

公开(公告)日：2024-01-11

申请号：US17861140

申请日：2022-07-08

Applicant: Nokia Solutions and Networks Oy

Inventor： Yannick Lefevre ,  Amitkumar Mahadevan ,  Michiel Verplaetse

IPC: H04L1/00 ,  H04B10/27

CPC classification number: H04L1/0054 ,  H04B10/27 ,  H04L1/0061

Abstract: A digital receiver based on one-dimensional hard demapping of an input symbol stream (FEC encoded) is configured to utilize LLRs created to have bit-specific magnitude values to improve the probability that the included decoder (such as an LDPC decoder) properly recovers each bit from the original stream. The digital receiver may be used with various types of data modulation schemes (e.g., PAM3, PAM4, DSQ8, etc.), with a specific set of LLR magnitudes created for each modulation scheme.

公开(公告)号：US11817975B2

公开(公告)日：2023-11-14

申请号：US17670889

申请日：2022-02-14

Applicant: Nokia Solutions and Networks Oy

Inventor： Wouter Lanneer ,  Yannick Lefevre ,  Paschalis Tsiaflakis ,  Werner Coomans

IPC: H04L25/03 ,  H04L25/02

CPC classification number: H04L25/03343 ,  H04L25/0212 ,  H04L2025/03815

Abstract: The present disclosure relates to an equalizer training unit for deriving equalization parameters for compensating data-dependent distortion in received samples by use of a training sequence including a sequence p>1 times and cyclically comprising N sub-sequences of respective combinations of L time-domain symbols of a modulation scheme, wherein the N sub-sequences are cyclically arranged in a selected order and such that L−1 symbols of a respective sub-sequence overlap with symbols in the preceding and following sub-sequences. The present disclosure further relates to a training sequence generator unit for generative the training sequence and an equalizer employing the equalizer training unit.

公开(公告)号：US20220123863A1

公开(公告)日：2022-04-21

申请号：US17470293

申请日：2021-09-09

Applicant: Nokia Solutions and Networks Oy

Inventor： Yannick Lefevre ,  Adriaan de Lind van Wijngaarden ,  Jochen Maes ,  Vincent Houtsma ,  Doutje Van Veen ,  Amitkumar Mahadevan ,  Michaël Fivez

IPC: H04L1/00 ,  H03M13/00 ,  H04B10/516 ,  H04B10/60

Abstract: Various example embodiments for supporting forward error correction (FEC) in a communication system are presented. Various example embodiments for supporting FEC in a communication system may include the selection of a FEC setting for a communication channel from a transmitter to a receiver, e.g., the selection of a FEC setting for a communication channel, the selection of a FEC setting for a data burst sent over a communication channel, the selection of a FEC setting for a portion of a data burst sent over a communication channel, switching between FEC settings for different portions of a data burst over a communication channel, or the like, as well as various combinations thereof.

公开(公告)号：US12273665B2

公开(公告)日：2025-04-08

申请号：US17166966

申请日：2021-02-03

Applicant: Nokia Solutions and Networks Oy

Inventor： Yannick Lefevre ,  Amitkumar Mahadevan ,  Werner Van Hoof

IPC: H04Q11/00

Abstract: An optical network unit (ONU) includes a transmitter and receiver to optically communicate with an optical line terminal (OLT) of a passive optical network. The ONU is configured to send an acknowledgment message to the OLT in response to a burst-profile message unicast by the OLT. The acknowledgement message indicates unsupported forward error correction (FEC) code in response to the burst-profile message identifying an FEC code for upstream transmission and the ONU not supporting the FEC code for upstream transmission to the OLT.

公开(公告)号：US11812206B2

公开(公告)日：2023-11-07

申请号：US17562273

申请日：2021-12-27

Applicant: Nokia Solutions and Networks Oy

Inventor： Yannick Lefevre ,  Amitkumar Mahadevan ,  Werner Van Hoof

IPC: H04Q11/00 ,  H04B10/272

CPC classification number: H04Q11/0067 ,  H04B10/272 ,  H04Q11/0005 ,  H04Q2011/0047

Abstract: An apparatus, for use by an Optical Network Unit, performs receiving, from an Optical Line Terminal, a broadcast message including code set information indicating a first code set selected from a plurality of error correction code sets; determining whether the first code set is comprised in a group of code sets supported by the Optical Network Unit, wherein, the group of code sets includes at least one code set of the plurality of error correction code sets; and encoding an upstream transmission with the first code set, in case the first code set is included in the group of code sets.

公开(公告)号：US20230224074A1

公开(公告)日：2023-07-13

申请号：US17573930

申请日：2022-01-12

Applicant: Nokia Solutions and Networks Oy

Inventor： Yannick Lefevre ,  Amitkumar Mahadevan ,  Werner Van Hoof

IPC: H04L1/00 ,  H04B10/27

CPC classification number: H04L1/0042 ,  H04B10/27

Abstract: An upstream (US) optical line terminal (OLT) for a passive optical network having at least one downstream (DS) optical network unit (ONU). The OLT generates a trigger signal indicating a need to receive at least one US burst having a shortened codeword for a first forward error-correction (FEC) code. Based on the trigger signal, the OLT transmits a DS message instructing the ONU to transmit an US burst having a shortened codeword. The OLT receives and decodes the US burst having the shortened codeword using the first FEC code. During periods of high bit-error rate, the shortened codewords increase the ability of the OLT to decode the US bursts and keep communications from the ONU alive. The OLT can use the decoded US bursts to measure BER and, if appropriate, instruct the ONU to use a different FEC code.

公开(公告)号：US10944504B2

公开(公告)日：2021-03-09

申请号：US16407543

申请日：2019-05-09

Applicant: Nokia Solutions and Networks Oy

Inventor： Yannick Lefevre

IPC: H04L1/00 ,  H03M13/11 ,  H03M13/29 ,  H04J1/04 ,  H04L27/00

Abstract: A communication system in which a constellation employing partially anti-symmetric amplitude labels is used to transmit probabilistically shaped amplitudes such that said amplitudes are also used to determine the signs applied thereto for transmission. In an example embodiment, a data transmitter is configured to use a suitable logic function (e.g., an XOR function) to place the parity generated by an FEC code into a selected amplitude bit while using the partially anti-symmetric amplitude labels to avoid placing the parity into the sign bits of the transmitted constellation symbols. In some embodiments, the FEC code can be a low-density parity-check code. Some embodiments are compatible with layered FEC coding, e.g., employing an outer FEC code and an inner FEC code. In some embodiments, FEC coding may be optional. Some embodiments can advantageously be used in communication systems relying on DMT modulation, such as the systems providing DSL access over copper wiring.

公开(公告)号：US20200162395A1

公开(公告)日：2020-05-21

申请号：US16594492

申请日：2019-10-07

Applicant: Nokia Solutions and Networks OY

Inventor： Bart Pauwels ,  Yannick Lefevre ,  Jochen Maes

IPC: H04L12/823 ,  H04L12/861 ,  H04L12/851 ,  H04L29/06

Abstract: Example embodiments describe a transmitter including data encapsulation circuitry configured to encapsulate data packets into Data Transport Units, DTUs, for further transmission over a communication medium. The data packets have respective Quality of Service, QoS, tolerances.The data encapsulation circuitry is configured to delay transmission of first data packets with a lower QoS tolerance and to group the first data packets in a subset of DTUs available for transportation of the first data packets.

公开(公告)号：US20200044770A1

公开(公告)日：2020-02-06

申请号：US16407543

申请日：2019-05-09

Applicant: Nokia Solutions and Networks Oy

Inventor： Yannick Lefevre

IPC: H04L1/00 ,  H04J1/04 ,  H04L27/00 ,  H03M13/29 ,  H03M13/11

Abstract: A communication system in which a constellation employing partially anti-symmetric amplitude labels is used to transmit probabilistically shaped amplitudes such that said amplitudes are also used to determine the signs applied thereto for transmission. In an example embodiment, a data transmitter is configured to use a suitable logic function (e.g., an XOR function) to place the parity generated by an FEC code into a selected amplitude bit while using the partially anti-symmetric amplitude labels to avoid placing the parity into the sign bits of the transmitted constellation symbols. In some embodiments, the FEC code can be a low-density parity-check code. Some embodiments are compatible with layered FEC coding, e.g., employing an outer FEC code and an inner FEC code. In some embodiments, FEC coding may be optional. Some embodiments can advantageously be used in communication systems relying on DMT modulation, such as the systems providing DSL access over copper wiring.

公开(公告)号：US20190386776A1

公开(公告)日：2019-12-19

申请号：US16440072

申请日：2019-06-13

Applicant: Nokia Solutions and Networks Oy

Inventor： Yannick Lefevre ,  Werner Coomans ,  Jochen Maes

IPC: H04L1/00 ,  H04W72/04 ,  H03M7/40 ,  H04L29/06

Abstract: A method is proposed for encoding DTUs (30) in a transmitter (111; 211) for further transmission to a receiver (212; 112). Communications from the transmitter to the receiver alternate between first time sub-frames (22; 24) comprising data symbols of a first type (D2; U2) having a first data payload capacity (NDSC,MIN), and second time sub-frames (21; 23) comprising data symbols of a second type (D1; U1) having a second data payload capacity (NDSC,MAX) greater than the first data payload capacity. The method comprises encoding individual DTUs into Q block-interleaved codewords (40) for protection against communication errors, Q denoting a positive integer value; obtaining scheduling information (txsch_info) as to the types of data symbols over which the encoded DTUs (50) are to be conveyed; and enabling or disabling the further block-interleaving of a group of M consecutive encoded DTUs (60) based on the scheduling information for the respective M consecutive encoded DTUs, M denoting a positive integer value greater than one.The present invention also relates to a transmitter (111; 211) for encoding DTUs according to the method, and to a receiver (112; 212) for decoding the so-encoded DTUs.