WO2006137724A1 - Procede et appareil permettant de traiter des signaux composite pour former un signal de donnees, et de transferer les signaux de donnees - Google Patents

Procede et appareil permettant de traiter des signaux composite pour former un signal de donnees, et de transferer les signaux de donnees Download PDF

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Publication number
WO2006137724A1
WO2006137724A1 PCT/NL2005/000453 NL2005000453W WO2006137724A1 WO 2006137724 A1 WO2006137724 A1 WO 2006137724A1 NL 2005000453 W NL2005000453 W NL 2005000453W WO 2006137724 A1 WO2006137724 A1 WO 2006137724A1
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WO
WIPO (PCT)
Prior art keywords
signals
signal
labelling
composite
data
Prior art date
Application number
PCT/NL2005/000453
Other languages
English (en)
Inventor
Antonius Marcellus Jozef Koonen
Original Assignee
Stichting Voor De Technische Wetenschappen
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 Stichting Voor De Technische Wetenschappen filed Critical Stichting Voor De Technische Wetenschappen
Priority to PCT/NL2005/000453 priority Critical patent/WO2006137724A1/fr
Publication of WO2006137724A1 publication Critical patent/WO2006137724A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
    • H04B7/0842—Weighted combining
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/25—Arrangements specific to fibre transmission
    • H04B10/2581—Multimode transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/60—Receivers
    • H04B10/66—Non-coherent receivers, e.g. using direct detection

Definitions

  • the present invention relates to signal processing and signal transfer.
  • the invention relates to processing a plurality of signals to form at least one output signal.
  • the signals to be processed can be received after being transferred in parallel through a transfer medium.
  • the invention relates to processing signals which comprise data signals to be recovered.
  • the invention further relates to a method and apparatus for transferring signals in parallel through a transfer medium, using said method for processing signals.
  • data are transferred in a predetermined format from a transmitter through a transfer medium to a receiver.
  • the transfer medium can be adapted to be used with radio signals, optical signals, electrical signals and so on.
  • one goal is to transfer as many data, as fast, economical, and reliable as possible.
  • High bandwidth transfer media are used, and compression techniques may be used to keep the data amount to be transmitted as small as possible.
  • high bandwidth transfer media are expensive, and in general, the more data is transferred through one transfer medium at a time, the more loss and disturbance is faced. Disturbances may comprise loss of data signal strength, interference and mixing of data signals, which makes it necessary to recover and/or reconstruct the individual data signals at the receiving end of the transfer medium. Techniques to handle these disturbances are therefore sought after.
  • multimode fibre is an attractive medium for broadband in-house networks, being easier to install than single-mode fibre due to its large core diameter. This large core diameter facilitates light injection, and the splicing of fibre ends together. It is already widely accepted for short-range data communications in broadband LANs, benefiting from low-cost multimode fibre transceiver modules.
  • multimode Polymer Optical Fibre offers large flexibility and ductility, which further reduces installation costs in often less accessible customer locations.
  • bandwidth figures of multimode fibre are also being improved, by means of better control of the graded refractive index profile, but are still lower than those of single mode fibre, because of the large multimodal dispersion.
  • the limited bandwidth obstructs the desired integration of multiple broadband services into a single in-house network.
  • Wavelength multiplexing for example requires complex, expensive signal processing components for combining and separating the wavelength channels, and wavelength-specific optical sources, which need careful stabilisation.
  • the invention provides a method, and an apparatus for performing said method, for transferring a plurality of data signals, comprising the steps of associating each data signal with at least one labelling signal having at least one property, thus forming a set of signals, transmitting the sets of signals through a transfer medium, receiving composite signals from the transfer medium, each composite signal containing at least one set of signals, measuring the at .least one property of a labelling signal in each composite signal, and obtaining an output signal by 5 forming at least one combination of the composite signals on the basis of the measured properties, said combination containing essentially one data signal.
  • the invention provides a method for processing a plurality of composite signals to form at least one '
  • each .composite signal containing at least one set of signals, each set of signals comprising a data signal and at least one labelling signals being associated with the data signal, said labelling signal having at least one property, the method comprising the steps of receiving the • composite signals, measuring the at least
  • obtaining an output signal is performed by selecting one of the labelling signals and forming a weighted combination of the composite signals, wherein the data signals associated with other labelling signals than said one
  • the step of forming the weighted combination is evaluated on the basis of the output signal, and the evaluation result is used as feedback to optimise the weighting factors.
  • the property of the labelling signals has an expected value
  • the step of obtaining an output ' signal is performed on the basis of the difference between the measured value and the expected value of the property of each labelling signal.
  • a frequency range of each labelling signal is different from a frequency range of the associated data signal, such that for measuring a property the labelling signals can be separated easily from the data signal.
  • Figure 1 shows a schematic view of an apparatus according to the invention for transferring a plurality of data signals.
  • Figure 2 shows a signal processing apparatus according to the invention for processing a plurality of composite signals.
  • Figure 1 shows a schematic view of an apparatus 100 for transferring a plurality of data signals.
  • the apparatus comprises a multiplexer 150 which associates data signals 101-104 with labelling signals 105-108, thus forming signal sets 109-112.
  • the labelling signals preferably are in another frequency range than the data signals.
  • each labelling signal has its own frequency, enabling recognition of each labelling signal in a later stadium.
  • the labelling signals have a predetermined amplitude.
  • the signal sets 109-112 are input to a transmitter 160 which will, if desired, convert the signal sets 109-112 to a format appropriate for a transfer medium 170, and transmit the converted signals 109' -112' through the transfer medium 170.
  • Examples of converted signals 109' -112' are optical signals, radio signals, electrical signals, with respective transfer media 170 being fibre, air, and electrically conductive materials.
  • a dispersion of signals may take place.
  • a signal processing apparatus 200 receives signals 201-204 from the transfer medium 170 that are not identical to the transmitted signal sets 109-112, but rather are signals that are composites of the several signal sets originally transmitted.
  • the composite signals 201-204 may comprise at least part of one or more of the signal sets (101, 105), (102, 106), (103, 107) and (104, 108), e.g. due to mixing of the signals during transfer (i.e. crosstalk between the signal sets) .
  • the amount of composite signals received may be equal to the amount of signal sets 109-112 transmitted, but the amount of composite signals received may also exceed the amount of signal sets 109-112 sent.
  • N signal sets are transmitted by the transmitter 160, and M composite signals are received by the signal processing apparatus 200.
  • the transfer medium 170 can then be modelled as an N x M transfer matrix, describing to what extent each signal set is represented in each composite signal.
  • the signal processing apparatus 200 creates output signals 251-254 on the basis of a processing of the composite signals .
  • Figure 2 shows a more detailed view of the signal processing apparatus 200.
  • the signal processing apparatus 200 comprises a receiver 260 embodied by a Photo diode Integrated Circuit (PDIC) , comprising pairs 261-264 of Photo Diodes and buffers.
  • PDIC Photo diode Integrated Circuit
  • the PDIC receives the composite signals 201-204, and converts them into electrical signals 205-208 suitable for further processing.
  • the electrical signals 205-208 are input to a measurement device 265, which measures the amplitudes of the labelling signals that are present in the composite signals.
  • This information is provided, preferably in a digital way indicated at 209 to a signal processor 266.
  • the signal processor 266 calculates a transfer matrix containing information regarding the mixing of the signals 109' -112' during transfer. By inverting this matrix, multiplication factors are found, with which the composite signals can be multiplied in order to retrieve output signals that are essentially similar to the data signals 101-104 from Figure 1.
  • these multiplication factors are forwarded to MOSFET controllers 267-270.
  • MOSFET controllers 267-270 create analogue control signals 211-242, supplied to gates of MOSFETs (Metal Oxide Semiconductor Field Effect Transistors) 271-278, 281- 288, 291-298 and 301-308, for controlling the channel resistances of the MOSFETs. These channel resistances form voltage dividers together with the grounded resistors 309-316 at the respective inputs of the amplifier 279, 289, 299 or 309. Thus, when a MOSFET has a high channel resistance, a small part of the respective signals 205-208 will be supplied at the input of an amplifier 279, 289, 299 or 309. When a MOSFET has a low channel resistance, a large part of the respective signals 205-208 will be supplied at such an amplifier input. Thus by controlling the channel resistances of the MOSFETs, linear combinations of the composite signals 205-208 are formed as outputs of the apparatus .
  • MOSFETs Metal Oxide Semiconductor Field Effect Transistors
  • the MOSFET outputs are connected to respective inputs 243 and 244, 245 and 246, 247 and 248, 249 and 250 of amplifiers 279, 289, 299, 309.
  • Each amplifier has 2 inputs, of which one does not invert the signal, and the other one does; hence the signals offered to one of these inputs are amplified with a positive amplification factor, and the signals offered to the other one are amplified with a negative amplification factor, respectively.
  • This set-up has been chosen to make addition and subtraction of signals possible, with the weighting factors determined by the channel resistances of the respective MOSFETs.
  • arbitrary linear combinations of the composite signals 205-208, with positive and negative multiplication factors can be made. These multiplication factors can be adjusted by controlling the channel resistances of the MOSFETs.
  • the data signals 101-104 may be retrieved.
  • the output signals 251-254 may be fed back to the signal processor 266 which drives the MOSFET controllers 267-270 in order to improve the performance of the apparatus 200, i.e. to resolve the mixing present in the signals 205-208 and thus to regain the original data signals 101-104.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optical Communication System (AREA)

Abstract

La présente invention concerne un procédé et un appareil pour séparer les signaux de données qui ont été mixés au cours de la transmission au niveau d'un récepteur de façon moins complexe qu'avec les procédés de traitement de signaux connus, en particulier dans les réseaux de fibres optiques multimode, utilisant le multiplexage par division de groupe de mode pour transmettre les signaux de données d'un émetteur à un récepteur. Les signaux de marquage associés aux signaux de données reçus sont utilisés. Les signaux de marquage permettent au procédé et à l'appareil de fragmenter le mélange des signaux de données reçus et de récupérer les signaux de données initiaux. La fonctionnalité qui en résulte permet le multiplexage en longueur d'onde à des coûts inférieurs, grâce aux processeurs de signaux plus simples qui peuvent être hautement intégrés dans la technologie de circuit intégré électrique connue.
PCT/NL2005/000453 2005-06-22 2005-06-22 Procede et appareil permettant de traiter des signaux composite pour former un signal de donnees, et de transferer les signaux de donnees WO2006137724A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/NL2005/000453 WO2006137724A1 (fr) 2005-06-22 2005-06-22 Procede et appareil permettant de traiter des signaux composite pour former un signal de donnees, et de transferer les signaux de donnees

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/NL2005/000453 WO2006137724A1 (fr) 2005-06-22 2005-06-22 Procede et appareil permettant de traiter des signaux composite pour former un signal de donnees, et de transferer les signaux de donnees

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WO2006137724A1 true WO2006137724A1 (fr) 2006-12-28

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007015225A1 (de) * 2007-03-29 2008-10-09 Siemens Ag Verfahren zur Ermittlung einer Modengruppenmischungsmatrix eines Multimoden-Lichtwellenleiters und optische Übertragungssysteme

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0564167A2 (fr) * 1992-04-02 1993-10-06 AT&T Corp. Dispositif de détection sensible à la polarisation multiple pour la communication à fibres optiques
DE10114052C1 (de) * 2001-03-15 2002-07-25 Hertz Inst Heinrich Funkübertragungsverfahren im Innenraumbereich zur parallelen Funkübertragung von digitalen Datenteilströmen und mobiles Funkübertragungssystem
US20040120411A1 (en) * 2002-10-25 2004-06-24 Walton Jay Rodney Closed-loop rate control for a multi-channel communication system
US20040198452A1 (en) * 2002-07-30 2004-10-07 Roy Sebastien Joseph Armand Array receiver with subarray selection
WO2004095713A2 (fr) * 2003-04-14 2004-11-04 Bae Systems Information And Electronic Systems Integration Inc. Estimateur de symboles, d'amplitude et de debit
US20050002468A1 (en) * 2001-05-11 2005-01-06 Walton Jay R. Method and apparatus for processing data in a multiple-input multiple-output (MIMO) communication system utilizing channel state information

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0564167A2 (fr) * 1992-04-02 1993-10-06 AT&T Corp. Dispositif de détection sensible à la polarisation multiple pour la communication à fibres optiques
DE10114052C1 (de) * 2001-03-15 2002-07-25 Hertz Inst Heinrich Funkübertragungsverfahren im Innenraumbereich zur parallelen Funkübertragung von digitalen Datenteilströmen und mobiles Funkübertragungssystem
US20050002468A1 (en) * 2001-05-11 2005-01-06 Walton Jay R. Method and apparatus for processing data in a multiple-input multiple-output (MIMO) communication system utilizing channel state information
US20040198452A1 (en) * 2002-07-30 2004-10-07 Roy Sebastien Joseph Armand Array receiver with subarray selection
US20040120411A1 (en) * 2002-10-25 2004-06-24 Walton Jay Rodney Closed-loop rate control for a multi-channel communication system
WO2004095713A2 (fr) * 2003-04-14 2004-11-04 Bae Systems Information And Electronic Systems Integration Inc. Estimateur de symboles, d'amplitude et de debit

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
BATRA A ET AL: "Blind cancellation of co-channel interference", GLOBAL TELECOMMUNICATIONS CONFERENCE, 1995. CONFERENCE RECORD. COMMUNICATION THEORY MINI-CONFERENCE, GLOBECOM '95., IEEE SINGAPORE 13-17 NOV. 1995, NEW YORK, NY, USA,IEEE, US, vol. 1, 13 November 1995 (1995-11-13), pages 157 - 162, XP010607546, ISBN: 0-7803-2509-5 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007015225A1 (de) * 2007-03-29 2008-10-09 Siemens Ag Verfahren zur Ermittlung einer Modengruppenmischungsmatrix eines Multimoden-Lichtwellenleiters und optische Übertragungssysteme
WO2008119625A1 (fr) * 2007-03-29 2008-10-09 Siemens Aktiengesellschaft Procédé de détermination d'une matrice de mélange de groupes de modes pour un guide d'ondes optiques multimode et systèmes de transmission optiques

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