Alcatel Lucent

Alcatel

Nokia Solutions and Networks Oy

Provenance Asset Group LLC

Danny Van Bruyssel

Carl Jeremy Nuzman

Dirk Vanderhaegen

Jochen Maes

Adriaan J De Lind Van Wijngaarden

Michael Timmers

Jan Sylvia Verlinden

Alexei Ashikhmin

Philip Alfred Whiting

Carl Robert Posthuma

Paschalis Tsiaflakis

Koen De Schepper

Gerhard Guenter Theodor Kramer

Peter Paul Frans Reusens

Frank Cyriel Michel Defoort

Frank C Defoort

Miroslav Zivkovic

Raphael Paul Claude Andre Cassiers

Alain Anderlini

A wired communication systems, a subscriber device and a method, and more specifically related to initialization and/or update of communication parameters used for communication through the wired communication systems. 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.

Direct channel characterization for discontinuous time-frequency operation

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.

Gain adaptation for downstream vectoring systems

In one example embodiment, a method includes obtaining a crosstalk channel and a channel matrix and determining a power controlling matrix, the power controlling matrix for regulating powers corresponding to a plurality of active communication lines. The method further includes determining a vectoring matrix based on applying the power controlling matrix to the crosstalk channel and generating vectored signals using the vectoring matrix for communication of data over the plurality of active communication lines.

Methods and systems for reducing crosstalk via stabilized vectoring control

In accordance with an embodiment, the vectoring controller is configured to iterate through successive crosstalk acquisition cycles and, within respective ones of the crosstalk acquisition cycles, to configure sequences of crosstalk probing symbols for transmission over the respective communication lines, to receive sequences of error samples as successively measured by respective receivers coupled to the respective communication lines while the sequences of crosstalk probing symbols are being transmitted, and to determine crosstalk estimates between the respective communication lines based on the sequences of error samples. The vectoring controller is further configured to randomize the successive sequences of crosstalk probing symbols used during the successive crosstalk acquisition cycles, and to iteratively configure the vectoring processor based on the successive crosstalk estimates.

Randomization of crosstalk probing signals

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.

Hierarchical and adaptive multi-carrier digital modulation and demodulation

A crosstalk cancellation device cancels crosstalk noise of at most M disturbing communication lines in a victim communication line forming part of a vectoring group. The crosstalk cancellation device gradually decreases the cancellation depth of a cancelled disturbing communication line in the victim communication line upon a crosstalk noise variation in the vectoring group requiring cancellation of crosstalk noise of a not yet cancelled disturbing communication line in the victim communication line.

Crosstalk cancellation device and method with improved vectoring stabilisation

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.

Data retransmission request device, a data transmitter, and a data retransmission method for multi-tone systems

In one embodiment, the method for locating a defect in a wired transmission line, which extends between a first end and a second end, includes measuring a first modified noise signal at the first end by a first measuring unit, and making a first representation of the first modified noise signal. A second modified noise signal is measured at the second end by a second measuring unit, and a second representation of the second modified noise signal is made. The location of the defects are derived from the representations.

Methods for determining the location of a defect in a wired transmission line and systems according to such methods

Techniques are disclosed for compensating for crosstalk using adaptation of data signals transmitted over respective channels of a communication network. In one example, a method comprises the following steps. Data is transmitted to a communication network device via a communication line during a sequence of periods. For each period of the sequence of periods, a separate value of a measure of crosstalk that was measured at the communication network device is received, each value being an average of measurements at the device of measures of crosstalk for a plurality of communication network signal subcarriers. For each individual signal subcarrier of the plurality, a matrix is updated based on the received values, the matrix being configured to precode data transmissions to the communication network device over the individual signal subcarrier. The communication network may be a DSL system, the signal subcarriers may be DSL tones, and the measure of crosstalk may be a SINR value.

Optimizing precoder settings using average SINR reports for groups of tones

In a network for digital data packet transmission, quality records are stored in a memory. Each of the quality records is indicative for a reception quality being sensed of one or more received data packets. Thereupon, upon overflow of the memory, one or more of the quality records is discarded from the memory. For at least one of the quality records, discarding weights are generated as a function of at least one of the quality records and associated to the quality records. Hereby, upon such overflow, the discarding weights are taken into account in predefined rules and conditions according to which the discarding of the quality records is performed.

Method for monitoring impulse noise

An apparatus includes a DSL transceiver configured to transit to a DSL wait state in which a power transmitted from the DSL transceiver to a local-end line is substantially reduced in response to an interruption or substantial stop at the DSL transceiver of reception of DSL communications from the local-end line. The DSL transceiver is configured to transmit to the local-end line a DSL acknowledge signal in response to receiving from the local-end line a DSL wait signal. The DSL transceiver is configured to resume to transmit DSL communications to the local-end line at a power substantially higher than the power transmitted thereto in the DSL wait state in response either to receiving from the local-end line DSL transmissions at a substantially higher power than received there from in the DSL wait state or to receiving from the local-end line a second DSL acknowledge signal.

Validated signal resumption in DSL systems

A method includes maintaining temporally parallel DSL data communication sessions with DSL modems of a group via a set of lines. The method includes, in response to substantially stopping to receive DSL communications from one of the DSL modems via one of the lines, transmitting a substantially reduced average power to the one of the lines and monitoring the one of the lines to determine whether DSL communications have restarted being received from the one of the DSL modems. The method also includes resuming the maintaining of the temporally parallel DSL communication sessions in response to the monitoring determining that DSL communications have restarted being received from the one of the DSL modems.

Signal suspension and resumption in DSL systems

In a network for digital data packet transmission, reception quality of received data packets is sensed () by a remote terminal (). Thereupon, a bit string indicative for the sensed reception quality is generated (). This bit string or a compressed version of this bit string is transferred () in real-time over a management channel to a first central processing unit () in a network node () where the bit string is compacted or processed. By processing the bit string, the first central processing unit () may determine impulse noise characteristics. Alternatively, the bit string or a compressed or compacted version thereof may be forwarded to a second central processing unit () in a network manager () that processes the bit string and determines impulse noise characteristics.

Method for impulse noise monitoring, related network terminal, network node and network manager

In a full power state, data packet are transferred at full power from a transmitter to a receiver, whereas in a low power state data packet s are transferred at low power from the transmitter to the receive. To transit fast from the low power state to the full power state, the transmitter interrupts transmission of the currently transmitted low power data symbol and transmits a copy of the currently transmitted low power symbol at full power to the receiver.

Growing community of inventors

Bonheiden, Belgium

Danny Van Bruyssel