Abstract: In an embodiment, a communication device is provided comprising transmit circuitry and crosstalk reduction circuitry. In an embodiment, the crosstalk reduction circuitry is configured to receive crosstalk information indicative of crosstalk between a plurality of communication connections for only a part of communication channels of said communication connections.

Abstract: In an embodiment, vector training signals are received. Noise affecting the training signals is evaluated, and a noise indication is thus determined.

Abstract: According to an embodiment of a communication device, the communication device includes communication circuitry configured to communicate via a plurality of transmission channels. The communication circuitry includes crosstalk reduction circuitry to reduce crosstalk for a part of the plurality of transmission channels by joint processing of data of the part of the transmission channels. This part is selected from the plurality of transmission channels depending on a grouping of the transmission channels into at least two groups. Each of the at least two groups is assigned a target bit rate. The target bit rate differs for different groups.

Abstract: Embodiments related to far-end cross-talk coefficient updating in vector transmission systems are depicted and described herein.

Abstract: Embodiments related to FEXT estimation and signaling in vectored systems are described and depicted herein.

Abstract: Vectored communication devices and methods are provided for communication via a plurality of communication connections. Communication on at least some of the communication connections is switchable between a low power mode and a regular mode.

Abstract: In an embodiment, a method of compensating crosstalk on a plurality of transmission links is disclosed. The method includes providing first values depending on crosstalk among a plurality of transmission links. Each first value corresponds to one of a plurality of crosstalk channels, and each crosstalk channel represents signal transfer from one of the plurality of the transmission links to a different one of the plurality of transmission links. Second values specific to the transmission links are provided. A number of crosstalk channels are selected from a plurality of crosstalk channels interfering with signal transmission on transmissions links. The selecting depends on quotients of the first values and the second values.

Abstract: In a method for generating a compensation signal for the compensation of at least one RFI interference signal that, in a DMT transmission, is permanently superposed on a received DMT reception signal being divided into a multiplicity of channels at least one reference channel from the multiplicity of channels is provided. The multiplicity of channels comprise a first portion provided as data channels for the data transmission and a second portion which is an observation region unused for the data transmission. Channel-specific coefficients for at least one of the data channels to be compensated are provided. The channel-specific coefficients specify a correlation of the RFI interference signal being superposed on the respective data channel in respect of the reference channel. A compensation signal is generated by weighting and summing the received DMT reception signals with the channel-specific coefficients per DMT frame and for each data channel to be compensated.

Abstract: Embodiments related to communication of data in a first and second transmission mode are depicted and described herein.

Abstract: A method, wherein the following steps are iteratively repeated: providing each of a plurality of signals at a respective one of a plurality of transmission links; transmitting each of the plurality of signals over the respective one of the plurality of transmission links; and measuring signal-to-noise ratios of the plurality of signals transmitted over the plurality of transmission links, wherein an input power level of each of the plurality of signals is set such that the signal-to-noise ratios of the plurality of signals converge when measured after their transmission over the plurality of transmission links.

Abstract: An apparatus and method is disclosed with a circuit selecting a first number of transmission channels from a plurality of transmission channels for a first number of transmission links, wherein the selection depends on channel capacities of the first number of transmission channels. A second number of transmission channels is selected from the plurality of transmission channels for a second number of transmission links, wherein the selection depends on channel capacities of the second number of transmission channels.

Abstract: In a method of transmission power control, transmission powers of transmission channels and/or transmission power spectral densities are adjusted so as to improve the transmission characteristics.

Abstract: A method, wherein the following steps are iteratively repeated: providing each of a plurality of signals at a respective one of a plurality of transmission links; transmitting each of the plurality of signals over the respective one of the plurality of transmission links; and measuring signal-to-noise ratios of the plurality of signals transmitted over the plurality of transmission links, wherein an input power level of each of the plurality of signals is set such that the signal-to-noise ratios of the plurality of signals converge when measured after their transmission over the plurality of transmission links.

Abstract: In a method of transmission power control, transmission powers of transmission channels and/or transmission power spectral densities are adjusted so as to improve the transmission characteristics.

Abstract: In a communication device, a multi-carrier signal with at least one group of signal carriers is received from a communication connection. For each of the signal carriers, at least one individual error value is evaluated or generated. From the individual error values, a combined error value is evaluated or generated. The combined error value is transmitted on a backchannel of the communication connection.

Abstract: An apparatus includes a transmitter configured to transmit data via a plurality of communication channels of a communication connection. The transmitter is further configured to transmit a same sequence for vector training on each of the communication channels. The sequences for at least two of the communication channels are shifted with respect to each other.

Abstract: A method and a device for reducing the crest factor of a signal is operable to generate a correction signal as a combination of a plurality of partial correction signals having respectively predetermined frequencies and a signal having a reduced crest factor being issued as a differential between the correction signal and the signal. The respectively predetermined frequencies are selected such that the correction signal, which has a period length that is shorter than a length of the signal, is periodic. Therefore, according to the invention, only one period of the correction signal is determined and the correction signal is then determined as a periodic continuation of the one period.

Abstract: A device has a plurality of output terminals to provide a plurality of signals to a plurality of transmission links; at least one input terminal to receive information representing a projection of a complex valued error signal onto one direction; and a determination circuit, coupled to the at least one input terminal.

Abstract: In a method for reducing RFI interference in a DMT data transmission a compensation signal for the purpose of reducing an RFI interference signal superposed on a transmitted DMT reception signal is generated. Only carrier frequencies of the DMT reception signal in the vicinity of the interference frequency of the interference signal which are not utilized for the data transmission are used, at least one normalized complex spectral function for all the carriers of said interference signal is provided, an FFT for the purpose of obtaining spectral values of said DMT reception signal is carried out, and an observation window to a current DMT frame of the DMT reception signal is assigned. A complex evaluating coefficient for the current DMT frame is calculated and the complex evaluating coefficient resulting from the spectral values of said DMT reception signal within the observation window and the complex evaluating coefficient are identical for all frequencies within the current DMT frame.

Abstract: Embodiments related to far-end cross-talk coefficient updating in vector transmission systems are depicted and described herein.