公开(公告)号：US20210266202A1

公开(公告)日：2021-08-26

申请号：US16800124

申请日：2020-02-25

Applicant: Nokia Solutions and Networks OY

Inventor： Paschalis Tsiaflakis

IPC: H04L25/03 ,  G06N5/04 ,  G06N20/00 ,  G06F17/17 ,  H04L25/02

Abstract: A digital circuit for implementing a channel-tracking functionality, in which an adaptive (e.g., FIR) filter is updated based on reinforcement learning. In an example embodiment, the adaptive filter may be updated using an LMS-type algorithm. The digital circuit may also include an electronic controller configured to change the convergence coefficient of the LMS algorithm using a selection policy learned by applying a reinforcement-learning technique and based on residual errors and channel estimates received over a sequence of iterations. In some embodiments, the electronic controller may include an artificial neural network. An example embodiment of the digital circuit is advantageously capable of providing improved performance after the learning phase, e.g., for communication channels exhibiting variable dynamicity patterns, such as those associated with aerial copper cables or some wireless channels.

公开(公告)号：US20210135710A1

公开(公告)日：2021-05-06

申请号：US17077598

申请日：2020-10-22

Applicant: Nokia Solutions and Networks Oy

Inventor： Paschalis Tsiaflakis ,  Alain Anderlini ,  Danny Van Bruyssel

IPC: H04B3/54 ,  H04B17/336

Abstract: The present invention relates to wired communication systems, and more specifically to initialization and/or update of communication parameters used for communication through the wired communication systems.
In accordance with an embodiment of the invention, an access node comprises at least one processor and memory storing instructions that when executed by the at least one processor cause a local transceiver of the access node to transmit signaling data via a subscriber line to a remote transceiver, the signaling data identifying particular symbol positions within a sequence of symbols transmitted over the subscriber line during show-time as being suitable for characterizing a direct communication channel between the local transceiver and the remote transceiver.
The present invention also relates to a subscriber device, and to a method for initializing or updating communication parameters within a wired communication system.

公开(公告)号：US10992341B2

公开(公告)日：2021-04-27

申请号：US16442952

申请日：2019-06-17

Applicant: Nokia Solutions and Networks OY

Inventor： Paschalis Tsiaflakis ,  Jochen Maes ,  Werner Coomans ,  Carl Nuzman

IPC: H04B3/487 ,  H04B3/32 ,  H04J11/00 ,  H04L5/00 ,  H04J1/00 ,  H04B3/04 ,  H04B3/54

Abstract: A multi-line digital transceiver configured to use low-complexity beamforming on at least some tones to boost effective SNR values for selected subscriber lines. In an example embodiment, the beamforming coefficients can be restricted to one-bit values or two-bit values, e.g., such that the corresponding beamforming computations can be implemented using only sign changes, swaps of the real and imaginary parts, and/or zeroing of some values, and without invoking any full-precision hardware multiplication operations. At least some embodiments can be run on a significantly simpler and/or less powerful vectoring engine than conventional beamforming solutions while still being able to provide nearly optimal beamforming SNR gains. In some embodiments, additional scaling by powers of two may be applied to at least some signals contributing to the beamforming, e.g., to satisfy power constraints for some or all of the subscriber lines.

公开(公告)号：US20200228161A1

公开(公告)日：2020-07-16

申请号：US16246989

申请日：2019-01-14

Applicant: Nokia Solutions and Networks OY

Inventor： Paschalis Tsiaflakis ,  Carl Nuzman

IPC: H04B3/32

Abstract: A multi-line digital transceiver configured to use digital signal vectoring in a manner that causes effects of crosstalk between distinct groups of subscriber lines to be effectively mitigated, without directly attempting to mitigate effects of crosstalk within any one of those distinct groups. In an example embodiment, effects of crosstalk within each of the distinct groups can be mitigated indirectly using an appropriate T/FDMA schedule, according to which, during a given symbol period, a given resource block of any of the distinct groups can carry data corresponding to a single respective subscriber. A precoder (postcoder) matrix for the digital signal vectoring can be generated using block-diagonalization techniques appropriately constrained, e.g., using the groups' definitions, aggregate-transmit-power restrictions, etc. In various embodiments, the disclosed digital signal vectoring can be used on the downlink or on the uplink, or both.