Power line communications method and apparatus

System, for transmitting and receiving signals over residential electrical cables includes at least one active wire, one neutral wire and one ground wire. The system includes at least two power line modems, each one of the two power line modems including a processor, transmitters and at least one receiver, transmitters and the receiver being coupled with the processor, for respectively transmitting and receiving the signals. At least two of the wires form at least one receive wire pair and at least two of the wires form at least one transmit wire pair. Each one of the transmitters defines a respective carrier wave range over the transmit wire pair, the processor determining a frequency carrier wave for the signals when the signals are transmitted. A given one of the transmitters transmits the signals if the frequency carrier wave is in the carrier wave range of the given one of the transmitters.

Power line communications method and apparatus

Apparatus, for transmitting and receiving signals over residential electrical cables, includes a processor, at least one transmitter and at least one receiver. The transmitter and the receiver are coupled with the processor, for respectively transmitting and receiving the signals. The apparatus is coupled with an electrical cable including at least one active wire, one neutral wire and one ground wire. At least two of the wires form receive wire pairs wherein at least two of the wires form at least one transmit wire pair. The processor enables the at least one receiver to be coupled with the receive wire pairs and wherein the processor dynamically switches a coupling of the at least one receiver to another one of the plurality of receive wire pairs.

POWER LINE COMMUNICATIONS METHOD AND APPARATUS

Method for communication channel coordination between nodes, each node including at least one of a transmitter and a receiver, for transmitting and receiving signals over residential electrical cables. The residential electrical cables include at least one active wire, one neutral wire and one ground wire, at least two of the wires forming wire pairs. The method includes the procedures of, for a given one of the receiver, examining the transmitter in each one of the nodes which communicates with the receiver, selecting one of the examined transmitters as a primary transmitter, determining an optimal receive wire pair for the receiver to receive the signals transmitted between the primary transmitter and the receiver, informing all the examined transmitters of the determined optimal receive wire pair, and tracking at least one communication characteristic over the determined optimal receive wire pair. 1. Method for communication channel coordination between a transmitter and a receiver , for transmitting and receiving signals over residential electrical cables , said residential electrical cables comprising at least one active wire , one neutral wire and one ground wire , at least two of said wires forming a plurality of wire pairs , said method comprising the procedures of:selecting one of said plurality of wire pairs for at least one of transmitting said signals and receiving said signals; andbefore transmitting said signals, transmitting a directive frame to said receiver, said directive frame indicating which one of said plurality of wire pairs said transmitter is transmitting a next one of said signals over.2. The method according to claim 1 , further comprising the procedure of transmitting a selective acknowledgement (SACK) frame over said selected wire pair after transmitting said next one of said signals.3. The method according to claim 1 , wherein said procedure of selecting comprises the sub-procedure of selecting one of said plurality of wire pairs as a ...

FRAMING SCHEME AND METHOD FOR DIGITAL COMMUNICATION OVERHEAD AND LATENCY REDUCTION

A data communication framing scheme of a bit stream that is divided among a plurality of discrete physical frames, each physical frame is of a definite number of symbols in duration, each symbol is associated with at least one sub-carrier in a plurality of sub-carriers, the physical frame is partitioned in time into at least an uplink zone and a downlink zone, the data framing scheme comprising a logical frame having a logical frame start position that is offset by a rational number of said symbols from a reference symbol, said reference symbol is selected from said definite number of symbols, wherein said logical frame extends in time to coincide with at least part of the duration of said physical frame and at least part of the duration of another physical frame in said plurality of discrete physical frames. 1. A data communication framing scheme of a bit stream that is divided among a plurality of discrete physical frames , each physical frame is of a definite number of symbols in duration , each symbol is associated with at least one sub carrier in a plurality of sub carriers , the physical frame is partitioned in time into at least an uplink zone and a downlink zone , the data framing scheme comprising:a logical frame having a logical frame start position that is offset from a reference symbol, said reference symbol is selected from said definite number of symbols;wherein said logical frame extends in time to coincide with at least part of the duration of said physical frame and at least part of the duration of another physical frame in said plurality of discrete physical frames.2. The data communication framing scheme according to claim 1 , further comprising:a media access protocol (MAP) context frame, said MAP context frame having a MAP context frame start position that is offset by a rational number of said symbols from said reference symbol within said physical frame; anda MAP message which includes at least one reference data type that respectively defines ...

Transmission scheme for communication systems

A transmission scheme for at least one transceiver pair, each transceiver pair including a first transceiver and a second transceiver, each transceiver including a transmitter and a receiver, the at least one transceiver pair defining a downlink between the transmitter of a first transceiver and the receiver of a second transceiver and further defining an uplink between the transmitter of the second transceiver and the receiver of the first transceiver, each transceiver pair transmitting data over a data transmission frame, the transmission scheme including determining a respective active-set for each one of the at least one transceiver pairs, the active-set including a combination of selected logical allocation units, each the logical allocation unit being defined as a unique combination of a time-slot and a frequency band, each selected logical allocation unit relates to at least one of the downlink only and the uplink.

SCHEME SYSTEM AND METHOD FOR POWER SAVING IN VECTORED COMMUNICATIONS

A transmission scheme for a plurality of transceiver pairs, the transmission scheme including a partition of at least a downlink transmission portion of a data transmission frame into a plurality of precoding intervals, each precoding interval being associated with a respective active group of transceiver pairs, each active group of transceiver pairs including a plurality of transceiver pairs, each precoding interval termination no earlier than the end of a respective downlink data transmission period associated with at least one of the transceiver pairs in the respective transceiver active group, wherein, a different respective precoder is associated with each of the active groups and wherein, at least the transmitting ports of the first transceivers, which are not members of an active group, turn off. 140.-. (canceled)41. A transmission method employing a transmission scheme for a plurality of transceiver pairs , each transceiver pair including a first transceiver and a second transceiver , each transceiver including a transmitter and a receiver , each said transceiver pairs defining a downlink between the transmitter of a first transceiver and the receiver of a second transceiver and further defining an uplink between the transmitter of said second transceiver and the receiver of said first transceiver , each transceiver pair transmitting data over at least a portion of a data transmission frame , said data transmission frame being partitioned into a downlink transmission portion and an uplink transmission portion , said transmission method including:partitioning at least said uplink transmission portion of said data transmission frame into a plurality of time segments, each time segment being associated with a respective uplink active group of transceiver pairs, each uplink active group of transceiver pairs including a plurality of transceiver pairs, each time segment terminating no earlier than the end of a respective uplink data transmission period associated ...

Robust on-line reconfiguration (olr) and synchronization protocol for digital subscriber line (dsl)

A method for maintaining configuration synchronization via an on-line reconfiguration (OLR) of system configuration parameters in a communication system having at least a first communication entity and a second communication entity that employ a reference configuration of system parameters, the method comprising the procedures of monitoring changes to at least one channel characteristic in at least one communication channel that links the first communication entity and the second communication entity; determining by the first communication entity an updated configuration that is constructed based on at least one modification relative to the reference configuration according to changes to the at least one channel characteristic; transmitting an OLR request from the first communication entity to the second communication entity via the at least one communication channel; receiving the OLR request by the second communication entity, and employing the updated configuration by the first communication entity and by the second communication entity.

Framing scheme and method for digital communication overhead and latency reduction

A data communication framing scheme of a bit stream that is divided among a plurality of discrete physical frames, each physical frame is of a definite number of symbols in duration, each symbol is associated with at least one sub-carrier in a plurality of sub-carriers, the physical frame is partitioned in time into at least an uplink zone and a downlink zone, the data framing scheme comprising a logical frame having a logical frame start position that is offset by a rational number of said symbols from a reference symbol, said reference symbol is selected from said definite number of symbols, wherein said logical frame extends in time to coincide with at least part of the duration of said physical frame and at least part of the duration of another physical frame in said plurality of discrete physical frames.

Dynamic resource allocation (dra) for communication systems

A method for dynamically modifying a frame structure in tranceiving of data between a network side entity and at least one node, the data is divided among a plurality of frames, the method comprising: providing an upstream management symbol offset position with respect to a frame reference point, said upstream management symbol offset position is associated with an up-stream management symbol that is configured to at least convey downstream acknowledgement data; providing an updated frame structure to said at least one node, including: information defining a transition point between downstream and upstream; and a reference point indicating when said updated frame structure shall take effect; receiving said updated frame structure by said at least one node; and employing said updated frame structure from said reference point, by said network side entity.

HYBRID PRECODER

A method employing linear precoding and non-linear precoding for transmitting data between at least two transmitters and a plurality of receivers via a plurality of communication channels over a plurality of subcarrier frequencies, the method comprising the procedures of transmitting by either one of said at least two transmitters, at least two training signals to respective said receivers; receiving by respective said receivers, said at least two training signals; evaluating channel characteristics of at least part of said communication channels, according to said at least two training signals; determining a precoding scheme selection that defines for at least part of said communication channels, over which of said subcarrier frequencies, said data transmitted shall be precoded using either one of linear precoding and non-linear precoding, according to evaluated said channel characteristics; precoding said data according to determined said precoding scheme selection; and transmitting said data according said precoding scheme selection. 149.-. (canceled)50. A method employing linear precoding and non-linear precoding for transmitting data between at least two transmitters and a plurality of receivers via a plurality of communication channels over a plurality of subcarrier frequencies , the method comprising the procedures of:transmitting by at least one of said at least two transmitters, at least two training signals to respective said receivers;receiving by respective said receivers, said at least two training signals;evaluating communication channel characteristics of at least part of said communication channels, according to said at least two training signals;determining a precoding scheme selection that defines for at least part of said communication channels, over which of said subcarrier frequencies, said data transmitted shall be precoded using either one of linear precoding and non-linear precoding, according to evaluated said channel characteristics; ...

SCHEME SYSTEM AND METHOD FOR POWER SAVING IN VECTORED COMMUNICATIONS

A transmission scheme for a plurality of transceiver pairs, the transmission scheme including a partition of at least a downlink transmission portion of a data transmission frame into a plurality of precoding intervals, each precoding interval being associated with a respective active group of transceiver pairs, each active group of transceiver pairs including a plurality of transceiver pairs, each precoding interval terminating no earlier than the end of a respective downlink data transmission period associated with at least one of the transceiver pairs in the respective transceiver active group, wherein, a different respective precoder is associated with each the active groups and wherein, at least the transmitting ports of the first transceivers, which are not members of an active group, turn off. 1. A transmission scheme for a plurality of transceiver pairs , each transceiver pair including a first transceiver and a second transceiver , each transceiver including a transmitter and a receiver , each said transceiver pairs defining a downlink between the transmitter of a first transceiver and the receiver of a second transceiver and further defining an uplink between the transmitter of said second transceiver and the receiver of said first transceiver , said transmitter of said first transceiver includes a pre-precoder coupled with the input of a precoder and a transmitting port coupled with the output of said precoder and with said receiver of said second transceiver , each transceiver pair transmitting data over at least a portion of a data transmission frame , said data transmission frame being partitioned into a downlink transmission portion and an uplink transmission portion , said transmission scheme including:a partition of at least said downlink transmission portion of said data transmission frame into a plurality of precoding intervals, each precoding interval being associated with a respective active group of transceiver pairs, each active group of ...

TRANSMISSION SCHEME FOR COMMUNICATION SYSTEMS

A transmission scheme for at least one transceiver pair, each transceiver pair including a first transceiver and a second transceiver, each transceiver including a transmitter and a receiver, the at least one transceiver pair defining a downlink between the transmitter of a first transceiver and the receiver of a second transceiver and further defining an uplink between the transmitter of the second transceiver and the receiver of the first transceiver, each transceiver pair transmitting data over a data transmission frame, the transmission scheme including determining a respective active-set for each one of the at least one transceiver pairs, the active-set including a combination of selected logical allocation units, each the logical allocation unit being defined as a unique combination of a time-slot and a frequency band, each selected logical allocation unit relates to at least one of the downlink only and the uplink. 137.-. (canceled)38. A transmission scheme for at least one transceiver pair , each transceiver pair including a first transceiver and a second transceiver , each transceiver including a transmitter and a receiver , said at least one transceiver pair defining a downlink between the transmitter of a first transceiver and the receiver of a second transceiver and further defining an uplink between the transmitter of said second transceiver and the receiver of said first transceiver , each transceiver pair transmitting data over a data transmission frame , said transmission scheme including:determining a respective active set for each one of said at least one transceiver pairs, said active set including a combination of selected logical allocation units, each said logical allocation unit being defined as a unique combination of a time slot and a frequency band, each selected logical allocation unit relates to at least one of said downlink only and said uplink,wherein said active set is determined to meet at least one of power dissipation requirements ...

SYSTEM AND METHOD FOR MANAGING OPTIMIZATION OF VECTORING PERFORMANCE

A method for controlling optimization of vectoring performance, using precoding in the transmission of data between at least two transmitters and a plurality of receivers via a plurality of communication channels over a plurality of subcarrier frequencies, the method comprising determining communication performance for said communication channels collectively, by using default precoding parameters; comparing between said communication performance and corresponding service level agreement data associated with each of said communication channels, thereby generating management control data; determining updated precoding parameters, according to said management control data; and applying said updated precoding parameters. 1. A method for controlling optimization of vectoring performance in the transmission of data between at least two transmitters and a plurality of receivers via a plurality of communication channels over a plurality of subcarrier frequencies , the method comprising:determining communication performance for said communication channels collectively, by using default precoding parameters;comparing between said communication performance and corresponding service level agreement data associated with each of said communication channels, thereby generating management control data;determining updated precoding parameters, according to said management control data; andapplying said updated precoding parameters.2. The method according to claim 1 , wherein said default precoding is selected from a list consisting of:set by a zero-forcing approach;set by a weighted zero-forcing approach; andset by a non-linear precoder.3. The method according to claim 1 , further comprising receiving at least a portion of said service level agreement data.4. The method according to claim 1 , wherein said management control data is selected from a list consisting of:precoder adaptation mode based on maximum-minimum fairness;precoder adaptation mode based on sum of bitrates over ...

SYSTEM AND METHOD UNIFYING LINEAR AND NONLINEAR PRECODING FOR TRANSCEIVING DATA

A method for precoding an information symbol conveying data for transmission between a plurality of transmitters and a plurality of receivers via a plurality of communication channels over a subcarricr frequency, the number of transmitters (N) is different than the number of active receivers (K) for that subcarrier frequency, the method comprising: receiving by said transmitters information pertaining to supportabilitics of said receivers to decode non-linearly preceded data; determining a precoding scheme defining for which of said receivers said data to be transmitted by said transmitters shall be precoded using at least one of linear precoding and non-linear precoding, according to said supportabilitics; constructing a signal by applying a reversible mapping to said information symbol, said reversible mapping includes elements each respectively associated with a particular one of said receivers, such that those said receivers supporting the decoding of said non-linearly precoded data are capable of reversing said reversible mapping to said information symbol, while for those said receivers not supporting the decoding of said non-linearly precoded data said information symbol is unaffected by said reversible mapping; constructing a precoder characterized by N≠K such that said precoder is configured to perform regularized generalized inversion of a communication channel matrix. 1. A method for precoding an information symbol conveying data for transmission between a plurality of transmitters and a plurality of receivers via a plurality of communication channels over a subcarrier frequency , the number of transmitters (N) is different than the number of active receivers (K) for that subcarrier frequency , the method comprising:receiving by said transmitters information pertaining to supportabilities of said receivers to decode non-linearly precoded data;determining a precoding scheme defining for which of said receivers said data to be transmitted by said ...

HYBRID PRECODER

A method employing linear precoding and non-linear precoding for transmitting data between at least two transmitters and a plurality of receivers via a plurality of communication channels over a plurality of subcarrier frequencies, the method comprising the procedures of transmitting by either one of said at least two transmitters, at least two training signals to respective said receivers; receiving by respective said receivers, said at least two training signals; evaluating channel characteristics of at least part of said communication channels, according to said at least two training signals; determining a precoding scheme selection that defines for at least part of said communication channels, over which of said subcarrier frequencies, said data transmitted shall be precoded using either one of linear precoding and non-linear precoding, according to evaluated said channel characteristics; precoding said data according to determined said precoding scheme selection; and transmitting said data according said precoding scheme selection. 149.-. (canceled)50. A method employing precoding , performing gain coordination between at least one of at least two transmitters that define a transmitter side and respective at least one receiver of at least two receivers that define a receiver side that are communicatively coupled via a plurality communication channels over a plurality of subcarrier frequencies , the method comprising the procedures of:calculating precoding coefficients for each of said subcarrier frequencies, at said transmitter side;for at least part of said subcarrier frequencies, determining a gain scaling factor, normalizing a respective transmitted output signal from each of said at least two transmitters, limited by respective power spectral density (PSD) values; andapplying substantially simultaneously said gain scaling factor to at least one of said at least two transmitters and respective at least one of said at least two receivers, according to ...

System and method unifying linear and nonlinear precoding for transceiving data

A method for precoding an information symbol conveying data for transmission between a plurality of transmitters and a plurality of receivers via a plurality of communication channels over a subcarrier frequency, the number of transmitters (N) is different than the number of active receivers (K) for that subcarrier frequency, the method comprising: receiving by said transmitters information pertaining to supportabilities of said receivers to decode non-linearly precoded data; determining a precoding scheme defining for which of said receivers said data to be transmitted by said transmitters shall be precoded using at least one of linear precoding and non-linear precoding, according to said supportabilities; constructing a signal by applying a reversible mapping to said information symbol, said reversible mapping includes elements each respectively associated with a particular one of said receivers, such that those said receivers supporting the decoding of said non-linearly precoded data are capable of reversing said reversible mapping to said information symbol, while for those said receivers not supporting the decoding of said non-linearly precoded data said information symbol is unaffected by said reversible mapping; constructing a precoder characterized by N≠K such that said precoder is configured to perform regularized generalized inversion of a communication channel matrix.

Scheme system and method for power saving in vectored communications

A transmission scheme for a plurality of transceiver pairs, the transmission scheme including a partition of at least a downlink transmission portion of a data transmission frame into a plurality of precoding intervals, each precoding interval being associated with a respective active group of transceiver pairs, each active group of transceiver pairs including a plurality of transceiver pairs, each precoding interval termination no earlier than the end of a respective downlink data transmission period associated with at least one of the transceiver pairs in the respective transceiver active group, wherein, a different respective precoder is associated with each of the active groups and wherein, at least the transmitting ports of the first transceivers, which are not members of an active group, turn off.

Method and system for concurrently operating g.fast and xdsl systems over the same binder

System and method unifying linear and nonlinear precoding for transceiving data

Data transceiver with filtering and precoding

A method for conveying digital data from a transmitter to a receiver includes specifying a spectral filtering profile to be applied in conveying the data. A sequence of input symbols is generated at the transmitter, corresponding to the data to be conveyed. The input symbols are precoded at the transmitter using Tomlinson-Harashima preceding responsive to the specified profile, so as to generate a corresponding sequence of precoded symbols. The precoded symbols are filtered in accordance with the specified profile. The precoded and filtered symbols are decoded at the receiver so as to recover the data therefrom.

Transmission scheme for communication systems

Communication method and system adapted for concurrently operating over a communication channel susceptible to crosstalk from at least a second communication system

A communication system operative for transmitting over a communication channel. The communication channel being susceptible to crosstalk from at least a second communication system different from the communication system. The communication system includes at least one transceiver pair. At least the a first transceiver of the transceiver pair includes a first analog from end and a first shaping filter coupled with the analog front end. The first analog front end at least includes a programmable gain amplifier. The attenuation of the first shaping filter in the overlapping frequency range is higher than the attenuation in the non-overlapping frequency range.

System and method for managing optimization of vectoring performance

Transmission scheme for communication systems

Dynamic resource allocation (dra) for communication systems

A method for dynamically modifying a frame structure in tranceiving of data between a network side entity and at least one node, the data is divided among a plurality of frames, the method comprising: providing an upstream management symbol offset position with respect to a frame reference point, said upstream management symbol offset position is associated with an upstream management symbol that is configured to at least convey downstream acknowledgement data; providing an updated frame structure to said at least one node, including: information defining a transition point between downstream and upstream; and a reference point indicating when said updated frame structure shall take effect; receiving said updated frame structure by said at least one node; and employing said updated frame structure from said reference point, by said network side entity.

Power line communication method and apparatus

Apparatus for transmitting and receiving signals over residential electrical cables, including a processor, at least one transmitter, at least one receiver and at least one switch, the transmitter and the receiver both being coupled with the processor, the switch being coupled with at least one of the transmitter and the receiver, the transmitter for transmitting the signals, the receiver for receiving the signals, the apparatus being coupled with an electrical cable including an active wire, a neutral wire and a ground wire, the switch being coupled with the active wire, the neutral wire and the ground wire, the active wire and the neutral wire forming a first communication channel, the active wire and the ground wire forming a second communication channel and the neutral wire and the ground wire forming a third communication channel, the switch enabling at least one of the transmitter and the receiver to be coupled with one of the first communication channel, the second communication channel and the third communication channel.

Transmission of stationary signals in quiescent mode

A method for transmission of high-speed digital signals includes transmitting a data signal over a communication line responsive to input data (10), which data signal is characterized by a frequency spectrum and a peak-to-average ratio (PAR). During an idle interval (12, 18) in the input data, an idle signal is transmitted (18, 22, 36), whose frequency spectrum is substantially stationary relative to the frequency spectrum of the data signal and whose PAR is substantially lower than the PAR of the data signal.

Transmission of stationary signals in quiescent mode

A method for transmission of high-speed digital signals includes transmitting a data signal over a communication line responsive to input data (10), which data signal is characterized by a frequency spectrum and a peak-to-average ratio (PAR). During an idle interval (12, 18) in the input data, an idle signal is transmitted (18, 22, 36), whose frequency spectrum is substantially stationary relative to the frequency spectrum of the data signal and whose PAR is substantially lower than the PAR of the data signal.

Data traffic-aware dynamic vectoring

Method and apparatus for improving performance of a splitterless asymmetric digital subscriber line (ADSL)

The present invention provides a method and apparatus for improving the performance of splitterless ADSL systems. The present invention provides a uniform technique for adapting an ADSL system to any of these situations. The invention provides a graduated approach to handling anomalies that may be caused by incompatible telephone equipment. One embodiment of the invention attempts to correct anomalous situations without having to interrupt the data communication. If more information is needed, a very brief channel echo measurement is conducted. Only if the problem cannot be resolved at this point is retraining of the modem performed. This approach greatly minimizes interruption of data communication and reduction of bandwidth. Another embodiment of the invention reduces the transmitted signal level to its lowest practical value to minimize interference with telephone equipment. Multiple levels of signal reduction are available, and user input may be obtained to optimize the transmit signal level.

Framing scheme and method for digital communication overhead and latency reduction

Framing scheme and method for digital communication overhead and latency reduction

A data communication framing scheme of a bit stream that is divided among a plurality of discrete physical frames, each physical frame is of a definite number of symbols in duration, each symbol is associated with at least one sub-carrier in a plurality of sub-carriers, the physical frame is partitioned in time into at least an uplink zone and a downlink zone, the data framing scheme comprising a logical frame having a logical frame start position that is offset by a rational number of said symbols from a reference symbol, said reference symbol is selected from said definite number of symbols, wherein said logical frame extends in time to coincide with at least part of the duration of said physical frame and at least part of the duration of another physical frame in said plurality of discrete physical frames.

Data traffic-aware dynamic vectoring

A method employing traffic-aware vectoring for transceiving data between a network side entity defining a network side, and at least two nodes defining a subscriber side, via a multiple-input multiple-output (MIMO) communication channel, over a plurality of subcarrier frequencies, the method comprising: determining an allocation that allocates each of said subcarrier frequencies for preceding with either one of a steady-state precoder, and at least one dynamic precoder; monitoring downstream data traffic from said network side entity toward said at least two nodes; and constructing said at least one dynamic precoder to optimize a bit-rate of said downstream data traffic, according to said monitoring, and said allocation; wherein said at least one dynamic precoder is configured to change with varying said data traffic conditions.

Übertragung stationärer signale im ruhemodus

Method and apparatus for improving performance of a splitterless asymmetric digital subscriber line (adsl)

A method for communicating at least one of the hook state and associated in line filter indication from the ADSL Transceiver Unit-Remote Side to the ADSL Transceiver Unit-Central Office, or vice versa, for improving the performance of splitterless ADSL systems. This information is used to determine robust bits and gain allocation during startup, and to correct the profile selection during fast retrain.

Data transceiver with filtering and precoding

A method for conveying digital data from a transmitter (20) to a receiver (40) includes specifying a spectral filtering profile to be applied in conveying the data. A sequence of input symbols is generated (22) at the transmitter, corresponding to the data to be conveyed. The input symbols are precoded at the transmitter using Tomlinson-Harashima precoding (25) responsive to the specified profile, so as to generate a corresponding sequence of precoded symbols. The precoded symbols are filtered (26) in accordance with the specified profile. The precoded and filtered symbols are decoded at the receiver so as to recover the data therefrom.

Network-specific powerline transmissions

A method for a network device of a powerline communications network includes selecting between a default preamble signal and a network-specific preamble signal specific to the network but not to a neighboring network and transmitting at least user data in conjunction with the selected preamble signal. Another method for a network device of a powerline communications network includes tuning a sensor to detect network-specific preamble signals specific to the network but not to a neighboring network and receiving at least user data associated with the preamble signals.

Data transceiver with filtering and precoding

Hybrid precoder

A method employing linear precoding and non-linear precoding for transmitting data between at least two transmitters and a plurality of receivers via a plurality of communication channels over a plurality of subcarrier frequencies, the method comprising the procedures of transmitting by either one of said at least two transmitters, at least two training signals to respective said receivers; receiving by respective said receivers, said at least two training signals; evaluating channel characteristics of at least part of said communication channels, according to said at least two training signals; determining a precoding scheme selection that defines for at least part of said communication channels, over which of said subcarrier frequencies, said data transmitted shall be preceded using either one of linear precoding and non-linear precoding, according to evaluated said channel characteristics; precoding said data according to determined said precoding scheme selection; and transmitting said data according said precoding scheme selection.

Framing scheme and method for digital communication overhead and latency reduction

A data communication framing scheme of a bit stream that is divided among a plurality of discrete physical frames, each physical frame is of a definite number of symbols in duration, each symbol is associated with at least one sub-carrier in a plurality of sub-carriers, the physical frame is partitioned in time into at least an uplink zone and a downlink zone, the data framing scheme comprising a logical frame having a logical frame start position that is offset by a rational number of said symbols from a reference symbol, said reference symbol is selected from said definite number of symbols, wherein said logical frame extends in time to coincide with at least part of the duration of said physical frame and at least part of the duration of another physical frame in said plurality of discrete physical frames.

Framing scheme and method for digital communication overhead and latency reduction

A data communication framing scheme of a bit stream that is divided among a plurality of discrete physical frames, each physical frame is of a definite number of symbols in duration, each symbol is associated with at least one sub-carrier in a plurality of sub-carriers, the physical frame is partitioned in time into at least an uplink zone and a downlink zone, the data framing scheme comprising a logical frame having a logical frame start position that is offset by a rational number of said symbols from a reference symbol, said reference symbol is selected from said definite number of symbols, wherein said logical frame extends in time to coincide with at least part of the duration of said physical frame and at least part of the duration of another physical frame in said plurality of discrete physical frames.

Scheme system and method for power saving in vectored communications

A transmission scheme for a plurality of transceiver pairs, the transmission scheme including a partition of at least a downlink transmission portion of a data transmission frame into a plurality of precoding intervals, each precoding interval being associated with a respective active group of transceiver pairs, each active group of transceiver pairs including a plurality of transceiver pairs, each precoding interval terminating no earlier than the end of a respective downlink data transmission period associated with at least one of the transceiver pairs in the respective transceiver active group, wherein, a different respective precoder is associated with each the active groups and wherein, at least the transmitting ports of the first transceivers, which are not members of an active group, turn off.

Transmission scheme for communication systems

A transmission scheme for at least one transceiver pair, each transceiver pair including a first transceiver and a second transceiver, each transceiver including a transmitter and a receiver, the at least one transceiver pair defining a downlink between the transmitter of a first transceiver and the receiver of a second transceiver and further defining an uplink between the transmitter of the second transceiver and the receiver of the first transceiver, each transceiver pair transmitting data over a data transmission frame, the transmission scheme including determining a respective active-set for each one of the at least one transceiver pairs, the active-set including a combination of selected logical allocation units, each the logical allocation unit being defined as a unique combination of a time-slot and a frequency band, each selected logical allocation unit relates to at least one of the downlink only and the uplink.