Abstract: The method includes organizing a plurality of subscriber lines into a first group of subscriber lines and a second group of subscriber lines, the first group of subscriber lines at least including all the subscriber lines of the plurality of subscriber lines that do not support non-linear precoding operation and the second group of subscriber lines including the remaining subscriber lines of the plurality of subscriber lines; scaling first signals to be transmitted over respective ones of the first group of subscriber lines to confine respective intermediate transmit power levels at the input of a modulo unit and further to bypass or make ineffective the operation of the modulo unit; and processing the so scaled first signals and second signals to be transmitted over respective ones of the second group of subscriber lines through the first and second precoding stages.

Abstract: The present disclosure relates to systems and methods for dynamic sharding of a database comprising data identifiable by keys comprised within a global ordered range. When handling a request for data of at least one key: providing the request to a predetermined shard store; the predetermined shard store verifying, by means of its local subrange collection, whether the at least one key is present in a local subrange of a shard stored on the predetermined shard store; and when at least one key is not present in a local subrange of a shard stored on the predetermined shard store, returning a message comprising the local subrange collection of the predetermined shard store.

Abstract: In accordance with an embodiment of the invention, the method includes detecting a leaving event such that a communication path established between two peer transceivers coupled to the particular subscriber line is to be orderly discontinued. The method further includes, during a pre-disconnection phase following the detection of the leaving event, switching the two peer transceivers into respective OFF power states during first symbol positions and into respective ON power states during second remaining symbol positions, characterizing crosstalk within the vectoring group during the first symbol positions while the second symbol positions are used for regular data communication if any, and definitively switching the two peer transceivers into the respective OFF power states after the crosstalk characterization completes.

Abstract: A network unit includes a non-linear precoder for jointly pre-processing transmit samples to be transmitted over respective communication channels for crosstalk mitigation. The non-linear precoder includes a first non-linear precoding stage configured to operate according to a first triangular precoding matrix and including a modulo function, followed by a second linear precoding stage configured to operate according to a second precoding matrix. The network unit further includes a first pilot signal generator configured to generate first pilot signals for pre-processing by the second precoding stage only to yield partially-precoded pilot signals for further transmission over the respective communication channels, and a controller configured to update the second precoding matrix based on first error measurements performed during the transmission of the partially-precoded pilot signals over the respective communication channels while keeping the first precoding matrix unaltered.

Abstract: In accordance with an embodiment the method includes temporarily configuring the vector processor with a new set of vectoring coefficients during one or more selected symbol positions; restoring the current set of vectoring coefficients outside the one or more selected symbol positions; obtaining at least one error measure over respectively at least one line of the group of vectored lines during the one or more selected symbol positions; and determining a suitability indication for the new set of vectoring coefficients based on the obtained at least one error measure.

Abstract: The method includes organizing a plurality of subscriber lines into a first group of subscriber lines and a second group of subscriber lines, the first group of subscriber lines at least including all the subscriber lines of the plurality of subscriber lines that do not support non-linear precoding operation and the second group of subscriber lines including the remaining subscriber lines of the plurality of subscriber lines; scaling first signals to be transmitted over respective ones of the first group of subscriber lines to confine respective intermediate transmit power levels at the input of a modulo unit and further to bypass or make ineffective the operation of the modulo unit; and processing the so scaled first signals and second signals to be transmitted over respective ones of the second group of subscriber lines through the first and second precoding stages.

Abstract: The present invention relates to a method for assigning transmission resources (101) to communications between an access node (11) and a plurality of subscriber devices (41 to 46) coupled to a shared transmission medium. In accordance with an embodiment of the invention, the method comprises characterizing interference between respective ones of the plurality of subscriber devices over the shared transmission medium, grouping highly-interfering subscriber devices into respective interfering groups (G1, G2, G3, G4) based on the so-characterized interference, and assigning disjoint transmission time intervals to upstream communication from any one subscriber device of any one interfering group and to downstream communication towards any other subscriber device of the same interfering group. The present invention also relates to a resource controller.

Abstract: A distribution point unit using discrete multi-tone technology, the distribution point unit being configured for connection to a wired shared medium associated with an available spectrum, the wired shared medium connecting the distribution point unit with a plurality of users, the distribution point unit including an assigning unit configured for assigning a first portion of the available spectrum to a first user of the plurality of users and a second portion of the available spectrum to a second user of the plurality of users; a sending and receiving unit configured for encoding and decoding digital data, using discrete multi-tone technology, and configured for sending and receiving encoded digital data over the assigned first portion to/from the first user and over the assigned second portion to/from the second user.

Abstract: The present invention relates to a signal processing unit for pre-processing signals for crosstalk mitigation. In accordance with an embodiment of the invention, the signal processing unit comprises a modulo unit configured to determine individual modulo shifts (?) for respective transmit samples (U) to be transmitted over respective communication channels (H) based on first channel coupling information (L), and to add the modulo shifts to the respective transmit samples, and a linear precoder configured to jointly process the resulting transmit samples based on second channel coupling information (p?) that aim at effectively diagonalizing an overall channel matrix (HP?) resulting from the concatenation of the linear precoder with the communication channels. The present invention also relates to a method for pre-processing signals for crosstalk mitigation.

Abstract: In an embodiment the method includes, at a transmit side, grouping carriers into carrier groups, and selecting a group constellation diagram for modulation of the carriers of a given carrier group. The selected group constellation diagram is built as a hierarchical sum of I super-imposed constellations vectors having predefined decreasing powers with the P strongest and the Q weakest constellation vectors being omitted. The carriers of the carrier group are modulated by means of the selected group constellation diagram, and P and/or Q parameters per carrier group and per multi-carrier data symbol are adjusted.

Abstract: In accordance with an embodiment of the invention, the method includes detecting a leaving event such that a communication path established between two peer transceivers coupled to the particular subscriber line is to be orderly discontinued. The method further includes, during a pre-disconnection phase following the detection of the leaving event, switching the two peer transceivers into respective OFF power states during first symbol positions and into respective ON power states during second remaining symbol positions, characterizing crosstalk within the vectoring group during the first symbol positions while the second symbol positions are used for regular data communication if any, and definitively switching the two peer transceivers into the respective OFF power states after the crosstalk characterization completes.

Abstract: At least one example embodiment discloses a method of reducing crosstalk in a system. The method includes obtaining a plurality of groups of lines based on crosstalk characteristics of the system, lines in a same group of lines being permitted to be active during a same time slot, identifying a first set of lines associated with data to send and a second set of lines associated with no data to send, the first set of lines being designated for transmission during a selected time slot, modifying the first set of lines in accordance with the plurality of groups of lines and transmitting symbols during the selected time slot using the modified first set of lines.

Abstract: At least one example embodiment discloses a method of reducing crosstalk in a system. The method includes obtaining a plurality of groups of lines based on crosstalk characteristics of the system, lines in a same group of lines being permitted to be active during a same time slot, identifying a first set of lines associated with data to send and a second set of lines associated with no data to send, the first set of lines being designated for transmission during a selected time slot, modifying the first set of lines in accordance with the plurality of groups of lines and transmitting symbols during the selected time slot using the modified first set of lines.

Abstract: The access node includes first transmit/receive circuitry with digital signal processing logic and digital-to-analog/analog-to-digital conversion logic, and second transmit/receive circuitry with transmit/receive amplifiers and line adaptation units for connection to a transmission line. The access node further includes an analog switch for dynamically connecting one of the first transmit/receive circuitry with one of the second transmit/receive circuitry according to a transmit/receive cross-connect table, and transmit/receive control logic for updating the transmit cross-connect table according to a transmit/receive traffic pattern over the respective transmission lines.

Abstract: The present disclosure relates to systems and methods for dynamic sharding of a database comprising data identifiable by keys comprised within a global ordered range. When handling a request for data of at least one key: providing the request to a predetermined shard store; the predetermined shard store verifying, by means of its local subrange collection, whether the at least one key is present in a local subrange of a shard stored on the predetermined shard store; and when at least one key is not present in a local subrange of a shard stored on the predetermined shard store, returning a message comprising the local subrange collection of the predetermined shard store.

Abstract: The invention pertains to a method and apparatus for testing a component of a vectoring system, such as a DSLAM performing crosstalk cancellation. The method is based on the insight that line termination equipment, such as a DSLAM, and in particular the crosstalk canceller, can be used to simulate a multiline network. A signal is exchanged between the line termination equipment and attached network termination equipment, passing through the crosstalk canceller which acts as a multiline simulator. Information indicative of an error component in a received version of the signal is used to assess the operation the vectoring system.

Abstract: The present invention relates to a signal processing unit for pre-processing signals for crosstalk mitigation. In accordance with an embodiment of the invention, the signal processing unit comprises a modulo unit configured to determine individual modulo shifts (?) for respective transmit samples (U) to be transmitted over respective communication channels (H) based on first channel coupling information (L), and to add the modulo shifts to the respective transmit samples, and a linear precoder configured to jointly process the resulting transmit samples based on second channel coupling information (p?) that aim at effectively diagonalizing an overall channel matrix (HP?) resulting from the concatenation of the linear precoder with the communication channels. The present invention also relates to a method for pre-processing signals for crosstalk mitigation.

Abstract: In accordance with an embodiment, the method includes detecting an update event whereupon a precoder needs to be updated, sending signal adjustment information to a receiver remotely coupled to a subscriber line out of the plurality of subscriber lines indicative of a signal compensation factor to be applied to a receive communication signal to compensate for a channel bias caused by the scheduled precoder update, and time-coordinating the precoder update with the enforcement of the signal compensation factor at the receiver.

Abstract: In a multi-tone data transmission system, data are modulated on a set of M tones for being transmitted between a transmitter and a receiver. The data retransmission request device in such system is adapted to request retransmission of a data transmission unit that is hierarchically modulated at a particular hierarchical level and that is modulated on a particular group of N tones, N being a positive integer value greater than one and smaller than or equal to M.

Abstract: In one embodiment, the method includes determining, at an access node, a precoder matrix for precoding transmission from the access node to a plurality of downstream devices over a plurality of lines. The plurality of lines include high power lines and low power lines. The high power lines are in active communication and transmit more symbols per frame than the low power lines. The method further includes precoding a signal vector using the precoder matrix regardless of the symbols the signal vector is sending over the low power lines. Here, the determining determines the precoder matrix such that the precoding does not mitigate the cross-talk effect the high power lines have on the low power lines. The method also includes transmitting over the plurality of lines based on the precoded signal vector.