Alcatel Lucent

Alcatel

Alcatel-Lucent USA Inc.

Jan Sylvia Verlinden

Etienne André Hubert Van Den Bogaert

Jochen Maes

Geert Bert Maarten Ysebaert

Carl Jeremy Nuzman

Philip Alfred Whiting

Dirk Vanderhaegen

Danny Van Bruyssel

Gerhard Guenter Theodor Kramer

Tom Bostoen

Miroslav Zivkovic

Michael Peeters

Marc Suzanne Paul Moonen

Katleen Peggie Florimond Van Acker

Mamoun Guenach

Radu Suciu

Raphaël Jean Cendrillon

Alexei Ashikhmin

Adriaan J De Lind Van Wijngaarden

Carl Robert Posthuma

Frank C Defoort

Geert Bert Ysebaert

Jeroen Celina Karel Van Elsen

Luc Vandendorpe

Etienne Andre Hubert Van Den Bogaert

Zoltan Balint

Philippe Jean Raymond Marie Antoine

Margherita La Fauci

Peter Luyten

Jerome Louveaux

Igor Popov

In one embodiment, the access node includes a vectoring control unit for estimating crosstalk coefficients between a set of subscriber lines based on crosstalk measurements carried out over the set of subscriber lines during a crosstalk measurement phase, and a vectoring processing unit for jointly processing, for crosstalk mitigation, signals to be transmitted over, or received from, the set of subscriber lines based on the estimated crosstalk coefficients. The access node further includes a controller configured to either postpone the execution of power adaptation over a particular line out of the set of subscriber lines after the completion of the crosstalk measurement phase, or to postpone the crosstalk measurement phase after the completion of power adaptation over the particular line.

Power adaptation avoidance during crosstalk measurements

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

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

The present invention relates to a device () comprising an interface to at least one active subscriber line () and an interface to at least one inactive subscriber line (). The device () comprises means for transmitting a first signal on the inactive subscriber line () and means for synchronously measuring crosstalk () induced into the active subscriber line () by transmitting the first signal on the inactive subscriber line ().

Device and associated method for measuring crosstalk

A transmitter device () and associated receiver device () providing a retransmission scheme for use in communications involving lossy media. The transmitter device () receives data packets () from a source and adds protection to selected subflows before delivering () them to the receiver device (). The receiver device () is able to remove the protection and process () the data packets further. The retransmission scheme introduces greater reliability on the lossy medium by restricting the retransmission () to a particular link and to selected subflows of traffic in the connection between a source and a destination.

Retransmission scheme for lossy media

The present invention relates to a method for data-flow quality control in a Digital Subscriber Line communications system comprising a transmitter, a receiver, and a Digital Subscriber Line intercoupling the transmitter and the receiver. The transmitter sends a data-flow to the receiver, where the data-flow is modulated onto data-carriers according to a bit allocation indicative for the number of bits to be modulated on each data-carrier. The method comprises the steps of the receiver measuring the data-flow quality and subsequently the receiver instructs the transmitter to decrease the bit allocation with a same amount for a plurality of data-carriers in case the data-flow quality is unsatisfactorily low. Then the transmitter decreases the bit allocation accordingly.

Method for data-flow quality control, a related receiver and a related transmitter

A method involves performing a plurality of acts. The acts include transmitting a first signal stream to a first channel of a multi-channel communications medium while transmitting a second signal stream to a different second channel of the medium. The second signal stream is substantially temporally correlated to the first signal stream. The method includes receiving an SINR measured at a receiver configured to receive signals from the first channel. The SINR is measured while the receiver received the first signal stream. The method includes determining a channel matrix element between the first and second channels or a ratio of said channel matrix element to a diagonal element of the channel matrix. The act of determining is based on the received SINR.

Determining channel matrices by correlated transmissions to different channels

A method for determining at least one operational transmit power Sover a communication channel (L) coupled to a disturbance causing transceiver (n) for at least one tone (k), comprises the steps of provision of at least one reference victim communication channel (L) for representing at least one reference victim for all victim communication channels which are degraded by cross-talk interferences by said communication channel (L), and maximizing the data rate (R) over said at least one reference victim communication channel (L) under the constraint that the data rate over said communication channel (L) achieves a target rate (R) without exceeding a power constraint (P).

Power spectrum control method for communication channels limited by disturbers and apparatus for performing such a method

The present invention relates to a method for determining a transmit PSD over a remotely-deployed line, which method comprising the steps of: A method according to the invention further comprises the steps of: The present invention also relates to a power control unit.

Method and apparatus for determining a transmit PSD at a remote location

A method for determining transmission characteristics over a first communication path and a second communication path, while an amount of the signal transmitted over the first communication path couples into the second communication path. In case of excess of capacity over the first communication path and a shortage of capacity over the second communication path, the transmit power over said first communication path is decreased such that the requested service is met over both communication paths. This optimal transmit power can be determined by trying successive transmit power values until the requested service is met, e.g. by means of a dichotomy algorithm or the like. The optimal transmit power value can be computed directly as well, e.g. by making use of the transfer characteristics of the coupling path. A transceiver unit may also be used to implement the present method.

Echo reduction to achieve a requested service

The present invention relates to a method for data-signal quality control, a related receiver and a related transmitter in an XDSL communications system, where this XDSL communications system comprises a transmitter and a receiver. The transmitter is coupled to the receiver over an XDSL line, over which the transmitter sends a data-signal on a plurality of data carriers for carrying this data-signal from the transmitter to the receiver. This receiver analyses a quality of the data-signal received by the receiver and subsequently requests the transmitter, in case this quality of the data-signal is beneath a predefined level to improve the quality of the data-signal, by performing an equal transmit power increase over a plurality of the data-carriers. The transmitter in response to the requesting improves the data-signal by performing an equal transmit power increase over at this plurality of data-carriers.

Method for data-signal quality control, a related receiver and a related transmitter

A power control method for transceiver units conveying data over discrete tones. The method includes the steps of: determining a transmit power over a physical channel for each individual tone, such that this transmit power maximizes a weighted function of data rates achievable with this tone over the physical channel and over modeled neighboring channels, with the constraint that this transmit power conforms to a transmit power mask, summing up the data rates over the whole set of tones, adjusting the weights such that the total data rates over the modeled neighboring channels reach some target data rates, and such that the total data rate over the physical channel is maximized, with the constraint that each weight is identical over the whole set of tones.

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Deurne, Belgium

Jan Sylvia Verlinden