EP2832003A1 - Système de transmission - Google Patents

Système de transmission

Info

Publication number
EP2832003A1
EP2832003A1 EP12711877.6A EP12711877A EP2832003A1 EP 2832003 A1 EP2832003 A1 EP 2832003A1 EP 12711877 A EP12711877 A EP 12711877A EP 2832003 A1 EP2832003 A1 EP 2832003A1
Authority
EP
European Patent Office
Prior art keywords
conductor
input terminals
terminals
type signal
output terminals
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP12711877.6A
Other languages
German (de)
English (en)
Inventor
Markus Warken
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia Solutions and Networks Oy
Original Assignee
Nokia Solutions and Networks Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nokia Solutions and Networks Oy filed Critical Nokia Solutions and Networks Oy
Publication of EP2832003A1 publication Critical patent/EP2832003A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems

Definitions

  • the present invention relates to the field of transmission systems, especially to a transmission system for digital subscriber line transmission.
  • DSL digital subscriber line
  • conductors are used for transmitting signals.
  • pairs of conductors are used for transmitting one signal due to different earth potential.
  • a common signal may be added to both conductors.
  • the common signal and thus distortions occurring during transmission may be computationally eliminated.
  • still only one signal may be transmitted by one conductor pair .
  • a transmission system in particular for a digital subscriber line transmission.
  • the transmission system comprises a first plurality of input terminals, a first plurality of output terminals, a plurality of conductor pairs, each conductor pair being assigned to one of the first plurality of input terminals and to one of the first
  • each conductor pair is formed by a first conductor and a corresponding second conductor, a second plurality of input terminals, and a second plurality of output terminals .
  • Each of the first plurality of input terminals is adapted to supply a first part of a primary-type signal to a first conductor of one of the plurality of conductor pairs and a second part of the primary-type signal to the corresponding second conductor.
  • the first part and the second part of the primary-type signal are indicative for one digital signal.
  • Each of the second plurality of input terminals is adapted to supply a first part of a secondary-type signal to at least one of the plurality of conductor pairs in addition to the first part and the second part of the primary-type signal.
  • Each of the second plurality of input terminals is further adapted to supply a second part of the secondary-type signal to at least a further one of the plurality of conductor pairs in addition to the first part and the second part of the primary-type signal.
  • the first part and the second part of the secondary-type signal are indicative for one digital signal .
  • each input terminal of the first plurality supplies a separate or single primary-type signal and that each input terminal of the second plurality supplies a separate or single secondary-type signal.
  • Each conductor pair is adapted to transmit signals to an assigned one of the first plurality of output terminals and to at least two of the second plurality of output terminals.
  • the number of input terminals of the first plurality of input terminals corresponds to the number of input terminals of the second plurality of input terminals, to the number of output terminals of the first plurality of output terminals and to the number of output terminals of the second plurality of output terminals .
  • This aspect of the invention is based on the idea to provide an enhanced transmission system, in which the number of transmittable signals can be enhanced. This may be achieved by providing, in addition to the transmission channel being provided by each conductor pair, so called "phantom
  • Phantom channels are based on the idea to add signals, in this context called secondary-type signals, here by the second plurality of input terminals, to the signals being supplied by the first plurality of input terminals, in this context called primary-type signals.
  • primary-type and secondary-type in this context may denote that the primary-type signals are supplied by the first plurality of input terminals, and that the secondary- type signals are supplied by the second plurality of input terminals, providing the so-called phantom channels.
  • a primary-type signal is split in two parts and supplied to a conductor pair, i.e., the first part of the signal is supplied to a first conductor and the second part of the signal is supplied to the second conductor of one conductor pair.
  • the first part is a positive amount of the signal and the second part is a negative amount of the signal.
  • this may also be vice versa or any other kind of splitting.
  • a further, secondary-type signal is split in two parts, typically a positive amount and a negative amount, and these parts are supplied to different conductor pairs, at least two conductor pairs. In effect, one part is supplied to the first and the second conductor of a conductor pair. The same signal may be supplied to a plurality of the conductor pairs .
  • each conductor pair transmits several signal or signal parts.
  • "phantom channels” may be provided .
  • Conductor pairs in this context may denote any kind of conductor being able to transmit signals.
  • Signals in this context may denote optical or electrical signals .
  • the conductors may be used in a pair configuration, wherein two conductors are typically used for one signal.
  • Conductors in this context may be for instance wires, for example copper wires transmitting electrical signals.
  • Conductors may also denote optical fibres transmitting optical signals .
  • the number of signals being transmitted corresponds to the number of conductors being provided by the plurality of conductor pairs .
  • MIMO multiple in multiple out
  • Crosstalk is one of the main limiting factors in DSL
  • the DSL prior art uses arrays of decoupled SISO (single in single out) transmissions.
  • MIMO MIMO to a DSL transmission system using the first plurality of input terminals and the first plurality of output terminals, may refer to an application of spatial multiplexing MIMO where the starting points of the wires (input terminals) are identified as sending antennas and the endpoints (output terminals) as receiving antennas.
  • the signal power can be significantly higher than in traditional DSL techniques as now crosstalk and even what otherwise was considered noise form transmission channels as explained above .
  • open loop or closed loop MIMO should be used, can be adapted according to specific requirements.
  • the DSL MIMO channel estimations may be much more stable than those of wireless transmission schemes simply because of a very limited range and magnitude of possible perturbations and a much longer time scale of these perturbations.
  • each of the first plurality of output terminals is adapted to retrieve the corresponding primary-type signal from the assigned conductor pair, wherein the retrieved signal is indicative for a digital signal
  • each of the second plurality of output terminals is adapted to retrieve the corresponding secondary-type signal by retrieving different signals from the plurality of conductor pairs and by
  • Each of the first plurality of output terminals each being assigned to one of the plurality of conductor pairs may retrieve the primary-type signal which has been supplied directly by the corresponding input terminal to this
  • Each of the second plurality of output terminals may retrieve signals from all conductor pairs and may calculate the secondary-type signal being supplied by a corresponding input terminal based on the predefined
  • the predefined transmission scheme is defined by a predefined transmission matrix.
  • the rank of such a transmission matrix may define the number of different signals that can be received.
  • a transmission matrix may define transformations which occur to signals being transmitted over the conductor pairs .
  • the predefined transmission matrix is defined dynamically based on channel estimations .
  • the channel estimations may be performed by measurement based on pilot signals.
  • the transmission matrix may then be calculated and used for signal processing for transmission. This may be based on MIMO techniques, in particular using spatial multiplexing gain, as mentioned above.
  • the transmission matrix may be a NxN matrix, wherein N corresponds to the number of conductors of the plurality of conductor pairs . According to a further embodiment of the invention, this matrix may acquire a rank N.
  • the transmission matrix is a 4x4 matrix.
  • Such a matrix may have for instance the form of
  • the transmission scheme is further defined by a noise vector representing noise being added to the signals during transmission of the signals.
  • noise or distortions may occur during
  • R stands for the vector of the received signals
  • H for the NxN transmission matrix
  • Y for the vector of signals at the sender side
  • N for the vector of noise.
  • the rank of the transmission matrix may define the number of different signals that can be received.
  • the transmission system further comprises a plurality of
  • each of the first plurality of input terminals is coupled to a corresponding one of the plurality of transforming units and wherein each of the second plurality of input terminals is coupled to a
  • a transforming unit in this context may refer to a unit comprising a transformer for transforming electrical energy being indicative for an input signal of an input circuit into electrical energy being indicative for signals to be
  • each transforming unit is adapted to transform a digital signal in an electrical signal and to split the electrical signal in a first part and a second part.
  • the transforming unit may comprise a digital to analog converter or an analog to digital converter for converting a digital input signal into an electrical signal for
  • the transmission system further comprises a further plurality of transforming units, wherein each of the first plurality of output terminals is coupled to a corresponding one of the further plurality of transforming units and wherein each of the second plurality of output terminals is coupled to a - Si -
  • a transforming unit in this context may refer to a unit comprising a transformer for transforming electrical energy being indicative for an input signal of an input circuit into electrical energy being indicative for signals to be
  • the transforming unit may also split such a signal in two parts for being supplied to different conductors .
  • each transforming unit is adapted to transform a first part and a second part of an electrical signal in a digital signal
  • the transforming units of output terminals may comprise a digital to analog converter or an analog to digital converter for converting a digital input signal into an electrical signal for transmission and/or for converting the transmitted electrical signal back to a digital signal.
  • the number of input terminals of the first plurality of input terminals, the number of input terminals of the second plurality of input terminals, the number of output terminals of the first plurality of output terminals and the number of output terminals of the second plurality of output terminals is two.
  • the transmission matrix would be a 4x4 matrix as described above.
  • the number of conductor pairs would be 2 and thus the number of
  • a transmitter in particular for being connectable to a digital subscriber line .
  • the transmitter comprises a first plurality of input terminals being connectable to a plurality of conductor pairs, each conductor pair being assigned to one of the first plurality of input terminals, wherein each conductor pair is formed by a first conductor and a corresponding second conductor, and a second plurality of input terminals .
  • Each of the first plurality of input terminals is adapted to supply a first part of a primary-type signal to a first conductor of one of the plurality of conductor pairs and a second part of the primary-type signal to the corresponding second conductor, wherein the first part and the second part of the primary-type signal are indicative for one digital signal.
  • Each of the second plurality of input terminals is adapted to supply a first part of a secondary- type signal to at least one of the plurality of conductor pairs in addition to the first part and the second part of the primary-type signal, and is adapted to supply a second part of the secondary-type signal to at least a further one of the plurality of conductor pairs in addition to the first part and the second part of the primary-type signal, wherein the first part and the second part of the secondary-type signal are indicative for one digital signal.
  • Each conductor pair is adapted to transmit signals to an assigned one of a first plurality of output terminals and to at least two of a second plurality of output terminals . The number of input terminals of the first plurality of input terminals
  • a receiver in particular for receiving signals from a digital subscriber line, is provided.
  • the receiver comprises a first plurality of terminals being connectable to a plurality of conductor pairs, each conductor pair being assigned to one of the first plurality of terminals, wherein each conductor pair is formed by a first conductor and a corresponding second conductor, and a second plurality of terminals .
  • the receiver is adapted to receive, via the first plurality of terminals and the second of output terminals, signals from a transmitter via the plurality of conductor pairs.
  • the transmitter comprises a first plurality of input terminals being connectable to the plurality of conductor pairs, each conductor pair being assigned to one of the first plurality of input terminals, and a second plurality of input terminals.
  • Each of the first plurality of input terminals is adapted to supply a first part of a primary-type signal to a first conductor of one of the plurality of conductor pairs and a second part of the primary-type signal to the corresponding second conductor, wherein the first part and the second part of the primary- type signal are indicative for one digital signal.
  • Each of the second plurality of input terminals is adapted to supply a first part of a secondary-type signal to at least one of the plurality of conductor pairs in addition to the first part and the second part of the primary-type signal, and is adapted to supply a second part of the secondary-type signal to at least a further one of the plurality of conductor pairs in addition to the first part and the second part of the primary-type signal, wherein the first part and the second part of the secondary-type signal are indicative for one digital signal.
  • Each conductor pair is adapted to transmit signals to an assigned one of the first plurality of
  • the number of input terminals of the first plurality of input terminals corresponds to the number of input terminals of the second plurality of input terminals, to the number of terminals of the first plurality of
  • the transmission system comprises a first plurality of input terminals, a first plurality of output terminals, a plurality of conductor pairs, each conductor pair being assigned to one of the first plurality of input terminals and to one of the first plurality of output terminals, wherein each conductor pair is formed by a first conductor and a corresponding second conductor, a second plurality of input terminals, and a second plurality of output terminals.
  • the method comprises (i) supplying, by each of the first plurality of input terminals, a first part of a primary-type signal to a first conductor of one of the plurality of conductor pairs and a second part of the primary-type signal to the corresponding second conductor, wherein the first part and the second part of the primary- type signal are indicative for one digital signal, (ii) supplying, by each of the second plurality of input
  • system and embodiments of the system according to the first aspect may include units or devices for performing one or more functions described with regard to the second aspect or an embodiment thereof.
  • the method and embodiments thereof according to the second aspect may include performing one or more functions described with regard to the first aspect or an embodiment thereof.
  • a computer program for transmitting signals in a transmission system is provided, the computer program being adapted for, when executed by a data processor assembly, controlling the method as set forth in the second aspect or an embodiment thereof .
  • reference to a computer program is intended to be equivalent to a reference to a program element and/or a computer readable medium containing instructions for
  • the computer program may be implemented as computer readable instruction code by use of any suitable programming language, such as, for example, JAVA, C++, and may be stored on a computer-readable medium (removable disk, volatile or nonvolatile memory, embedded memory/processor, etc.).
  • the instruction code is operable to program a computer or any other programmable device to carry out the intended
  • the computer program may be available from a network, such as the World Wide Web, from which it may be downloaded .
  • the herein disclosed subject matter may be realized by means of a computer program respectively software. However, the herein disclosed subject matter may also be realized by means of one or more specific electronic circuits respectively hardware. Furthermore, the herein disclosed subject matter may also be realized in a hybrid form, i.e. in a combination of software modules and hardware modules.
  • FIG. 1 shows a transmission system
  • Figure 2 shows a part of a transmission system according to an exemplary embodiment of the present invention.
  • Figure 3 shows a part of a transmission system according to an exemplary embodiment of the present invention.
  • Figure 4 shows a part of a transmission system according to an exemplary embodiment of the present invention.
  • Figure 5 shows a transmission system according to an
  • Figure 1 shows a transmission system 100 according to an exemplary embodiment of the invention.
  • the transmission system may be used in particular for a digital subscriber line transmission.
  • the transmission system comprises a first plurality of input terminals 110, 120 and a corresponding first plurality of output terminals 111, 121.
  • the transmission system 100 comprises further a plurality of conductor pairs 150, each conductor pair being assigned to one of the first plurality of input terminals 110, 120 and to one of the first plurality of output terminals 111, 121. Each conductor pair is formed by a first conductor 150 and a corresponding second conductor
  • the transmission system 100 further comprises a second plurality of input terminals 130, 140 and a corresponding second plurality of output terminals 131, 141.
  • Each of the first plurality of input terminals 110, 120 is adapted to supply a first part of a primary-type signal to a first conductor of one of the plurality of conductor pairs 150 and a second part of the primary-type signal to the corresponding second conductor.
  • the first part and the second part of the primary-type signal are indicative for one digital signal.
  • Each of the second plurality of input terminals 130, 140 is adapted to supply a first part of a secondary-type signal to at least one of the plurality of conductor pairs 150 in addition to the first part and the second part of the primary-type signal. Further, each of the second plurality of input terminals 130, 140 is adapted to supply a second part of the secondary-type signal to at least a further one of the plurality of conductor pairs 150 in addition to the first part and the second part of the primary-type signal.
  • the primary-type signals being supplied by the first plurality of input terminals 110, 120, also the first part and the second part of the secondary-type signal being supplied by the second plurality of input terminals 130, 140 are indicative for one digital signal.
  • Each conductor pair 150 is adapted to transmit signals to an assigned one of the first plurality of output terminals 111, 121 and to at least two of the second plurality of output terminals 131, 141.
  • Each of the second plurality of terminals 131, 141 is adapted to retrieve the signal being supplied by the corresponding input terminal by receiving all signals of all conductor pairs and by performing some calculations on the received signals .
  • the number of input terminals of the first plurality of input terminals 110, 120 corresponds to the number of input terminals of the second plurality of input terminals 130,
  • the idea of this invention is to increase the DSL throughput by introducing further phantom channels, i.e., virtual channels in addition to the physical channels being provided by the direct coupling of the first plurality of input terminals 110, 120, the conductor pairs 150 and the first plurality of corresponding output terminals 111, 121.
  • the data transmission speed over DSL connections may be further increased by a combination of three techniques, namely Phantom channels, vectoring, and EFM bonding.
  • Phantom DSL allows to introduce so called phantom channels so that the transmission matrix for a DSL connection using four wires can have a rank up to four - this means that the throughput is four times that of one wire.
  • the upper limit might be a rank of four .
  • a signal s g is provided to a transformer 210 of a transmission system 200.
  • conductors 250 is considered in one case as being equal on the two wires.
  • a symmetric, common part P may be added via input terminal 330 to the signal V s i g , wherein the common part would cancel at the receiver via output terminal 331.
  • the common part P may be added to V+ and V- as new signal.
  • V s i g l/2 (V + + P' - V- - P'), wherein the distortion and the additional signal P' cancels out .
  • a transmission system 400 with one phantom channel is shown.
  • the idea of phantom channels is now to first double the setup, i.e. use two pairs of wires. Then, also the signal P s i g is split into two parts P+ and P- and regained at the receiver by taking the difference of the sums of the signals on the two wire pairs.
  • the transmission system 400 comprises a second input terminal 420, corresponding conductor /wire pair and output terminal 421.
  • a signal W s g is transmitted over this wire pair.
  • the two parts of signal P s i g is added to both wire pairs via lines 430.
  • the common part representing signal P' s i g is taken via lines 431.
  • the basic formula of a transmission over n channel is
  • R stands for the vector of the received signals
  • H for the nxn transmission matrix
  • Y for the vector of signals at the sender side
  • N for the vector of noise.
  • the rank of the transmission matrix gives the number of different signals that can be received.
  • the phantom channel techniques so far have a rank 3
  • the transmission matrix can theoretically reach rank n-1 when n is the number of copper wires used. According to the embodiments shown in Figures 1 and 5 an n-th
  • the transmission matrix H may assume the following form:
  • the transmission system 500 of Figure 5 has a rank 4 transition matrix and in particular a fourth signal Q at the transmitter side and Q' at the receiver side.
  • this system comprises a second phantom channel being provided by the transformer 540, supplying the additional signal Q s i g and the corresponding transformer 541 retrieving the additional signal Q' s i g .
  • the additional signals may be added to the physical wires in any combination .
  • the additional signal Q s i g may be split into Q+ and Q-, wherein Q+ is added to the transmission wire of V and W, and Q- is only added to the transmission wire of V or to the transmission wires of V and W.
  • the additional (secondary-type) signals may be added to the physical wires in any suitable combination.
  • the additional signal will be added to two of the primary-type signals. That means, in this embodiment, the additional signal Q will be added as a first part Q+ to the first part V+ and the second part V- of signal V and to the first part W+ and the second part W- of signal W.
  • the second part Q- of the signal Q will be added to the first part V+ and the second part V- of signal V.
  • one part of the additional secondary-type signal will be added to both conductors of a conductor pair.
  • any suitable entity e.g. components, units and devices
  • any suitable entity disclosed herein may be provided in hardware .
  • some entities may be provided in software while other entities are provided in hardware .
  • any entity disclosed herein e.g. components, units and devices
  • a separate entity e.g. a software module, a hardware module or a hybrid module
  • an entity e.g. a software module, a hardware module or a hybrid module (combined software/hardware module) is configured for providing two or more functions as disclosed herein.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

La présente invention se rapporte à un système de transmission (100), et de transmission d'une ligne d'abonné numérique en particulier. Le système de transmission selon l'invention comprend : une première pluralité de bornes d'entrée (110, 120) ; une première pluralité de bornes de sortie (111, 121) ; une pluralité de paires de conducteurs (150), chaque paire de conducteurs étant assignée à l'une des bornes de la première pluralité de bornes d'entrée (110, 120) et à l'une des bornes de la première pluralité de bornes de sortie (111, 121), et chaque paire de conducteurs étant formée par un premier conducteur et par un second conducteur correspondant ; une seconde pluralité de bornes d'entrée (130, 140) ; et une seconde pluralité de bornes de sortie (131, 141). Chaque paire de conducteurs (150) est adaptée pour transmettre des signaux à l'une des bornes assignées de la première pluralité de bornes de sortie (111, 121) et à au moins deux bornes de la seconde pluralité de bornes de sortie (131, 141). Le nombre de bornes d'entrée de la première pluralité de bornes d'entrée (110, 120) correspond au nombre de bornes d'entrée de la seconde pluralité de bornes d'entrée (130, 140), au nombre de bornes de sortie de la première pluralité de bornes de sortie (111, 121) et au nombre de bornes de sortie de la seconde pluralité de bornes de sortie (131, 141).
EP12711877.6A 2012-03-30 2012-03-30 Système de transmission Withdrawn EP2832003A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2012/055814 WO2013143604A1 (fr) 2012-03-30 2012-03-30 Système de transmission

Publications (1)

Publication Number Publication Date
EP2832003A1 true EP2832003A1 (fr) 2015-02-04

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EP12711877.6A Withdrawn EP2832003A1 (fr) 2012-03-30 2012-03-30 Système de transmission

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WO (1) WO2013143604A1 (fr)

Families Citing this family (7)

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Publication number Priority date Publication date Assignee Title
WO2017167938A1 (fr) 2016-03-31 2017-10-05 British Telecommunications Public Limited Company Procédé et appareil de transmission de données sur une pluralité de paires de fils
EP3301898A1 (fr) 2016-09-29 2018-04-04 British Telecommunications public limited company Procédé et appareil pour transmettre des données depuis un dispositif émetteur à un ou plusieurs dispositifs de réception
US10819498B2 (en) 2017-03-31 2020-10-27 British Telecommunications Public Limited Company Method and apparatus for transmitting signals over a wire connection
US11082087B2 (en) 2017-03-31 2021-08-03 British Telecommunications Public Limited Company Method and apparatus for transmitting signals over wire connections
CN110521195B (zh) 2017-03-31 2021-03-05 英国电讯有限公司 向一个或更多个接收器装置发送数据的方法和发送器装置
EP3577891A1 (fr) 2017-03-31 2019-12-11 British Telecommunications Public Limited Company Procédé et appareil de transmission de signaux sur des liaisons filaires
EP3577890A1 (fr) 2017-03-31 2019-12-11 British Telecommunications Public Limited Company Procédé et appareil d'émission de signaux sur des connexions filaires

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US7773497B2 (en) * 2005-05-09 2010-08-10 Adaptive Spectrum And Signal Alignment, Inc. Phantom use in DSL systems
EP2091196B1 (fr) * 2008-02-13 2014-01-01 Alcatel Lucent Procédé et appareil pour la communication DSL

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