Abstract:
The present invention relates to an access node (200) with point-to-multi -point transmission capabilities. The access node comprises first transmit/receive circuitry (210m) with digital signal processing logic (DSP) and digital-to-analog/analog-to-digital conversion logic (DAC; ADC), and second transmit/receive circuitry (220n) with transmit/receive amplifiers (LD; LNA) and line adaptation units (LAU) for connection to a transmission line (Ln). The access node further comprises an analog switch (230) 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 (XT), and transmit/receive control logic (240) for updating the transmit cross-connect table according to a transmit/receive traffic pattern over the respective transmission lines. The transmit/receive traffic pattern conforms to a Time-Division Multiple Access TDMA scheme, or is determined according to actual transmit/receive traffic demands. The transmit/receive control logic is further for individually disabling or enabling the transmit/receive amplifiers concomitantly with the updating of the cross-connect table.
Abstract:
A method for performing spectrum management in view of a predetermined constraint in a network comprising an access link and a local area link, said access link and said local area link being interferingly coupled, said method comprising: quantifying interference between said access link and said local area link; determining a first spectral configuration for a first transmitter operating over said access link; and determining a second spectral configuration for a second transmitter operating over said local area link; wherein said determining of said first spectral configuration and said determining of said second spectral configuration are performed such that the respective achievable channel capacities of said access link and said local area link meet said predetermined constraint.
Abstract:
The invention provides a method and system, preferably an access node, for cancelling crosstalk among one or more plurality of network links. Crosstalk from a second network link, a disturber line, is according to the method (substantially) cancelled in a first network link, the victim line. Thereto a suitable signal component is provided to a third network link, the cancellation line. The signal component generally cancels the crosstalk signal from the second network link by providing a signal substantially in anti-phase. The third network link could be a spare line.
Abstract:
A method includes maintaining temporally parallel DSL data communication sessions with DSL modems of a group via a set of lines. In response to a substantial stop to reception of DSL communications from one of the DSL modems via one of the lines, the method includes transmitting a substantially reduced average power to the one of the lines and monitoring the one of the lines to determine whether reception of DSL communications has restarted 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 the reception of DSL communications from the one of the DSL modems has restarted.
Abstract:
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.
Abstract:
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: - detecting a request (init_req, join_req(y)) whereby a second multi-carrier data communication path (DPy) is to be initialized over a second subscriber line (Ly), A method according to the invention further comprises the steps of: - postponing initialization of the second data communication path, - acquiring crosstalk characteristics (xτ_char_xy(k)) from the second subscriber line towards the first subscriber line, - deriving from the crosstalk characteristics a parameter value (VN_x(k)) characterizing a virtual noise model used for communication over the first data communication path, and applying the parameter value for further communication over the first data communication path, and - resuming initialization of the second data communication path. The present invention also relates to an access node.
Abstract:
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.
Abstract:
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.
Abstract:
The present invention relates to a device (108, 109, 110) comprising an interface to at least one active subscriber line (112) and an interface to at least one inactive subscriber line (111). The device (108, 109, 110) comprises means for transmitting a first signal on the inactive subscriber line (111) and means for synchronously measuring crosstalk (130; 201, 203, 205, 207) induced into the active subscriber line (112) by transmitting the first signal on the inactive subscriber line (111).
Abstract:
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.