Patent application number | Description | Published |
20090041203 | DEVICE AND ASSOCIATED METHOD FOR MEASURING CROSSTALK - The present invention relates to a device ( | 02-12-2009 |
20090060013 | OPTIMIZING PRECODER SETTINGS USING AVERAGE SINR REPORTS FOR GROUPS OF TONES - 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. | 03-05-2009 |
20090060067 | Determining channel matrices by correlated transmissions to different channels - 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. | 03-05-2009 |
20090073868 | Device and associated method for measuring crosstalk - The present invention relates to a crosstalk estimation device for estimating crosstalk between disturber communication lines and victim communication lines. The crosstalk estimation device is able to change the power spectral density PSD on the victim communication lines and/or the disturber communication lines. The crosstalk estimation device further receives measured changes in operational parameters on the victim communication lines and/or disturber communication lines in order to estimate the crosstalk induced in the victim communication lines and/or disturber communication lines. | 03-19-2009 |
20090092036 | Method and apparatus for estimating crosstalk - The present invention relates to a method for estimating a first parameter (|H | 04-09-2009 |
20090304056 | Signal suspension and 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. | 12-10-2009 |
20100278222 | Validated signal resumption in DSL systems - 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. | 11-04-2010 |
20110261674 | Method And Apparatus For Configuring A Multi-Carrier Data Communication Path - The present invention relates to a method for configuring communication parameters for communication through a first multi-carrier data communication path (DPx) established over a first subscriber line (Lx), and comprising the steps of:
| 10-27-2011 |
20130101094 | METHOD FOR TESTING A COMPONENT OF A VECTORING SYSTEM AND LINE TERMINATION EQUIPMENT CONFIGURED TO CARRY OUT SAID METHOD - 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. | 04-25-2013 |
20130215935 | Methods And Systems For Reducing Crosstalk - At least one example embodiment discloses a system including a processor configured to receive a plurality of upstream pilot signals from a plurality of remote transceivers, respectively, in a time domain, determine channel coefficients based on the plurality of upstream pilot signals, determine filter coefficients based on the channel coefficients and to control transmission of the upstream pilot signals in the time domain to physical layers of a plurality of processing devices, the plurality of processing devices configured to communicate with the plurality of remote transceivers through the processor. | 08-22-2013 |
20140044247 | METHOD FOR PERFORMING SPECTRUM MANAGEMENT IN A SUBSCRIBER PREMISES NETWORK - A network includes an access link and a local area link. The access link and the local area link are interferingly coupled. A method for performing spectrum management in view of a constraint in the network includes quantifying interference between the access link and the local area link, determining a first spectral configuration for a first transmitter operating over the access link, and determining a second spectral configuration for a second transmitter operating over the local area link. The determining of the first spectral configuration and the determining of the second spectral configuration are performed such that the respective achievable channel capacities of the access link and the local area link meet the constraint. | 02-13-2014 |
20140092903 | POINT-TO-MULTI-POINT TRANSMISSION OVER A WIRED LOOP PLANT - 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. | 04-03-2014 |
20140241378 | HIERARCHICAL AND ADAPTIVE MULTI-CARRIER DIGITAL MODULATION AND DEMODULATION - 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. | 08-28-2014 |
20140247900 | DATA RETRANSMISSION REQUEST DEVICE, A DATA TRANSMITTER, AND A DATA RETRANSMISSION METHOD FOR MULTI-TONE SYSTEMS - 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. | 09-04-2014 |