EP2514119A1 - Procédé et agencement de stabilisation d'un procédé de codage couleur lors d'un transfert optique de données - Google Patents

Procédé et agencement de stabilisation d'un procédé de codage couleur lors d'un transfert optique de données

Info

Publication number
EP2514119A1
EP2514119A1 EP11704429A EP11704429A EP2514119A1 EP 2514119 A1 EP2514119 A1 EP 2514119A1 EP 11704429 A EP11704429 A EP 11704429A EP 11704429 A EP11704429 A EP 11704429A EP 2514119 A1 EP2514119 A1 EP 2514119A1
Authority
EP
European Patent Office
Prior art keywords
receiver
transmitter
compensation
message
color
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Withdrawn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
EP11704429A
Other languages
German (de)
English (en)
Inventor
Michael Bahr
Joachim Walewski
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to EP11704429A priority Critical patent/EP2514119A1/fr
Publication of EP2514119A1 publication Critical patent/EP2514119A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
    • H04B10/114—Indoor or close-range type systems
    • H04B10/116—Visible light communication
    • 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
    • H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
    • H04B10/114—Indoor or close-range type systems
    • 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
    • H04B10/50—Transmitters
    • H04B10/516—Details of coding or modulation

Definitions

  • the invention relates to a method and an arrangement for stabilizing a color coding method at a ⁇ opti-specific data transmission.
  • a data transmission by means of visible light Visible Light Communications, VLC
  • VLC Visible Light Communications
  • Data can be transmitted, for example, via light-emitting diodes (LEDs).
  • a data stream to be transmitted is transmitted, for example, in the form of modulations not perceptible to humans.
  • CSK Color Shift Keying
  • CCM Color Code Modulation
  • CMC Color Multiplex Coding
  • VLC using this color coding method is to use a mixed illumination of several primary colors for the additional transmission of data, the instantaneous
  • Said modification proposal describes an automatic receiver-side compensation of changes in the optical power of the elementary color light-emitting diodes provided on the transmitter side. Such variations occur, for example due to aging phenomena of the individual LEDs which are capable for For a lower optical performance with the same electrical power supplied ⁇ send with increasing operating time. Such a change is accompanied by a change in the quantum efficiency of the transmitter.
  • a compensation of the mixed color, ie the time-averaged spectrum of the emitted radiation is naturally not provided according to this proposed amendment due to the compensation only the receiver side.
  • the object of the invention is to provide means for transmitter-side compensation of the mixed color of the emitted optical radiation.
  • a solution of the problem is achieved by a method having the features of claim 1 and by an optical
  • the invention is based on a method known per se for the optical transmission of data between a transmitter and a receiver, in which a color coding method based on a plurality of elementary colors is provided for coding and transmission of the data, wherein a respective elementary color is further provided by a respective transmitter side optical radiation source is transmitted and received by the receiver side of a respective optical radiation receiver.
  • a control loop between the transmitter and the receiver, wherein the transmitter sends a calibration request containing training request ⁇ message to the receiver, wherein based on the calibration information in the receiver, a channel property matrix is formed and stored.
  • a Kompensationsinforma- tion is at least determined and sent back to the transmitter.
  • transmitter and “receiver” are to be understood as meaning that the transmitter, in addition to being able to both transmit and receive data in a duplex mode, simultaneously functions as a light source, while the transmitter
  • receiver is capable of transmitting and receiving data in a duplex mode, it is not necessarily operated as a light source ⁇ .
  • An operation of the transmitter as a light source includes, for example, an embodiment as a room lighting or as a display panel.
  • the invention enables a transmitter-side compensation of the mixed color of the emitted optical radiation, which has changed, for example, by an intensity drift of a single elementary color.
  • a significant advantage of the invention lies in the fact that using the means according to the invention a stable color coding is made possible, wherein the color drift is compensated on the part of the transmitter. Another obvious advantage is that the originally set color does not change over time.
  • a transmitter-side compensation of the color drift is advantageous in comparison with a receiver-side compensation in particular in that it is only used in one system - eg. the room lighting system used simultaneously for data transmission - and not in a variety of receivers - for example, communicating with the room lighting system portable computer - must be made.
  • the transmitter according to the invention is used in addition to the exchange of data for room lighting by the additively mixed elementary colors to the human eye give a temporally constant mixed color. It should JE but emphasizes that a parallel use of the invention shown SEN transmitter as room lighting is by no means erfindungschert ⁇ Lich.
  • a use of the invention in a reverse manner is conceivable in that the method according to the invention for the optical transmission of data exclusively has the purpose of adjusting the spectral data of the room lighting by exchanging calibration messages and / or compensation information.
  • the room lighting to be controlled such that a desired color set or a color ⁇ drift of the room lighting is compensated without the transmission of data would follow an beyond the compensation of this color drift purpose.
  • the reference channel property matrix may either have been previously transmitted and stored or already stored in a corresponding factory setting.
  • FIG. 1 shows a structural diagram for the schematic representation of an optical transmission system according to an embodiment variant of the invention; a timing chart of exchanged messages for correcting the color coding due to a change in the quantum efficiency identical with respect to AC and DC characteristics;
  • Fig. 3 is a timing chart of exchanged messages for correcting the color coding due to a change in quantum efficiency different in the AC and DC characteristics;
  • Fig. 5 a quantum efficiency of a radiation source as
  • FIG. 1 shows a visual data transmission optical system based on a CSK (Color Shift Keying)
  • VLC Vehicle-Light Communication
  • the data transmission system essentially consists of a transmitter TX, a transmission path TRM and a receiver RX.
  • the transmission system operates in duplex mode in which the transmitter TX can both transmit and receive data. The same applies to the receiver RX.
  • the CSK method is based on color coding with a plurality of elementary colors, for example red, green and blue.
  • a detailed description of CSK can be found in the proposed amendment to the standard IEEE 802.15.7, Yokoi et al. "Modified Text Clause 6.9.2.2", January 17th 2010, document identification ⁇ »15-10-0036-00-0007".
  • FIG. 1 for the sake of simplicity, only the functional units necessary for transmission are shown on the part of the transmitter TX and the functional units necessary for receiving are shown on the part of the receiver RX.
  • digital data DAT are first a
  • Color coder CC supplied.
  • the data DAT umgewan be delt ⁇ color maps in accordance with a translation rule rer in XY values. These XY values correspond to values in one
  • a transformer TR supplied at the output of three digital intensity data for an intensity each one of three elementary colors are provided.
  • a respective digital intensity data is supplied to a converter DA in which the digital intensity data is converted into analog intensity data.
  • These analog intensity data are supplied to a respective associated optical radiation source Ti, Tj, Tk, ie a first optical radiation source Ti, a second optical radiation source Tj, and a third optical radiation source Tk.
  • the first optical radiation source Ti corresponds to a red LED
  • the second optical radiation source Tj to a green LED
  • the third optical radiation source Tk to a blue LED
  • the optical radiation thus emitted by the respective radiation source Ti, Tj, Tk is guided via a transmission path TRM in the direction of the receiver RX.
  • the transmitted optical radiation impinges on a radiation receiver Ri, Rj, Rk, which is set to a respective elementary color, namely a first optical radiation receiver Ri, a second optical radiation receiver Rj and a third optical radiation receiver Rk Transmitter TX counter-rotating manner, the respective optical signal is converted in the receiver RX by the opti ⁇ radiation receivers Ri, Rj, Rk in an electrical analog signal which is fed to a respective converter DA, in which a respective conversion of the analog signal in a respective digital signal takes place.
  • the digital intensity data tapped at the three respective converters DA are fed to a transformer TR, which converts the value triplet into a value doublet in a manner opposite to the transmitter TX, which in turn is supplied to a color decoder CD, at whose output data DAT is finally taken which are identical in a correct mode with the data DAT supplied to the transmitter TX.
  • the following is a transfer function of a CSK -
  • A denotes below a matrix and a a column vector.
  • Radiation receivers Ri, Rj, Rk received digital signal s Rx are described as follows.
  • the vectorial received signal s Rx can for example consist of a red, green and blue signal, wherein the index i is assigned to the red signal, the index j to the green signal and the index k to the blue signal, ie
  • a receiver-side conversion matrix B is a Diago ⁇ nalmatrix and describes the conversion factor between the analog and the digital receiver signal.
  • a sensitivity matrix E describes the sensitivity of one of the color-selective radiation receivers Ri, Rj, Rk (photographic receptors) when receiving one of the elementary colors. Typically, but not necessarily, just as many will
  • Radiation receiver Ri, Rj, Rk as elementary color LEDs, so optical radiation sources Ti, Tj, Tk used.
  • the element e ⁇ i of the matrix E is, for example, the sensitivity of the red photoreceptor upon receipt of the light emitted by the red LED.
  • the Empfindigesmat ⁇ rix E takes into account the spectral efficiency of a JE establishing an elementary color appealing radiation receiver Ri, Rj, Rk, and in addition any appeal procedures provided color filter and through a corresponding linear combination of the coefficients of the sensitivity matrix E, a "cross-talk" between a respective elementary color-responsive radiation receivers Ri, Rj, Rk.
  • An example of such a coefficient of the sensitivity matrix E is
  • a transmittance matrix T describes the optical transmission from a respective elementary color radiation source
  • the transmittance matrix T describes the propagation characteristics of the light, eg how much of a red light transmitted by the first optical radiation source Ti arrives on the third radiation receiver Rk provided for blue light.
  • a quantum efficiency matrix Q is a diagonal matrix and describes the quantum efficiency of converting the drive current into optical power.
  • a transmitter-side conversion matrix A is also a diagonal matrix and describes the relationship between the digital signal and the AC driver current supplied to the LED.
  • the channel property matrix H is determined by sending calibration symbols as shown later. For example, Walsh codes are used. If, over time, the quantum efficiency of the optical radiation sources Ti, Tj, Tk changes, in other words the ratio of the respectively supplied driver current to optical power and hence the quantum efficiency matrix Q to the changed quantum efficiency matrix Q ', the received signals change for the same transmitter signals Signals and thus according to equation (1) also s Rx .
  • H ' BETQ' A determined.
  • H ' BETQ' A determined.
  • this changed channel property matrix H ' corrects the received signals, it does not correct the mixed color of the transmitted light resulting from the optical superimposition of the individual light-emitting diodes.
  • no changes are made to transmission parameters, so that compensation has so far taken place exclusively on the receiver side.
  • proposed control loop is reali ⁇ Siert through a return channel BC.
  • a calibration message Enge ⁇ erator TSG is provided, which are applied by digital calibration messages on the input of a respective converter DA to a respective source of optical radiation Ti, Tj, Tk.
  • the calibration messages which are subsequently converted and sent via the optical radiation sources Ti, Tj, Tk are correspondingly decoded on the receiver side RX and evaluated by a correction unit CU on the receiver side.
  • a calibration message contains a plurality of time slots into which orthogonal, preferably Walsh coded symbols are written. While a symbol into a plurality of consecutive time slots Unetra ⁇ gene. It is preferably a result, for statistical reasons, an improvement in the evaluation by the receiver when averaged over the received value of several time slots.
  • the calibration messages should not exceed a length of time of 10 milliseconds, since the human eye otherwise experiences a flickering of the radiation sources Ti, Tj, Tk which are also used as room lighting.
  • the correction unit CU of the receiver TX least one channel characteristic of at least one received calibration message is now determined a compensation factor ⁇ with a corresponding channel characteristic of at least one calibration message previously transmitted or stored by a comparison.
  • the channel property matrix H which as described above describes a plurality of channel properties, is stored by the correction unit CU on the receiver side RX as a reference channel property matrix Ho at the beginning of a sequence of calibration signal data or is already present on the receiver side TX.
  • a reference channel property matrix Ho at the beginning of a sequence of calibration signal data or is already present on the receiver side TX.
  • newly estimated values for H ⁇ are compared with the old values of the reference channel property matrix Ho.
  • a numerical vector c diag (Hi _1 Ho) is sent back to the transmitter.
  • the arithmetic operator diag (.) Designates a column vector consisting of the diagonal elements of a matrix (.). In the present exemplary embodiment, the number vector c therefore combines three compensation factors for the three elementary colors.
  • One possible criterion for triggering this process is the comparison of the values of c with the unit vector.
  • a compensation is initiated in the transmitter.
  • a value can for example be determined based on a determination ei ⁇ nes histogram of c and a predefined adjustable and / or previously determined confidence interval become. If the comparison of the values of the numerical vector of c with the unit vector yields a difference which is, for example, higher than the upper limit of the confidence interval, the said process is triggered.
  • the off-diagonal elements of the matrix C (Hi _1 Ho) un ⁇ zero, these can be attributed to other causes of faults, such as a blockage in the "About ⁇ talk" of Ti and Tj on Rk.
  • the Invention provided instead of the compensation information or in addition to the compensation information to transmit an error message to the transmitter TX. On the side of the transmitter TX, a corresponding warning about a possible malfunction can then be output to an identifiable receiver RX or to higher communication layers.
  • the reference matrix Ho originally stored on the receiver side TX in the correction unit CU can now again be used as a "decoding matrix" on the receiver side.
  • the inventive core idea is thus that by comparing the compensation matrix H ⁇ with the original compensation matrix Ho and the transmission of compensation factors c back to the transmitter a color drift of the transmitter can be compensated.
  • a CSK-modulated optical free-space transmission system can be used simultaneously for illumination and / or signaling purposes.
  • s Tx limited I up to avoid over ⁇ utilization of the LED are in general notation
  • These limit values can be specified by the manufacturer, for example, or can also be calculated from the recommended LED driver currents if the matrix A is known.
  • Equation (3) is then evaluated for the frequency for which a convex function of the vector takes a maximum. Using this function, the frequency representation of H is calculated, which is referred to as H F.
  • H F is now used for the determination of c described above.
  • FIG. 4 shows a function of the optical radiation power P of a radiation source Ti, Tj, Tk as a function of a supplied driving alternating current IAC, which is also known as quantum efficiency is shown. It is assumed that this function is approximately linear.
  • the solid line shown in Figure 4 corresponds to an original quantum efficiency QE1, which varies in the course of operation of the radiation source, in this example, reduced represented by the below dot-dash line according to a modified Quanteneffi ⁇ efficiency QE2.
  • the quantum efficiency matrix Q its diagonal elements are proportional to the quantum efficiency of a respective radiation source Ti, Tj, Tk.
  • a change in the quantum efficiency of individual radiation sources Ti, Tj, Tk thus leads to a change of the quantum efficiency matrix Q to a modified quantum efficiency matrix Q 'and corresponding to a changed channel property matrix H'.
  • FIG. 5 shows a function of the optical radiation power P of a radiation source Ti, Tj, Tk as a function of a supplied driver direct current IDC.
  • the light-emitting diodes used for the radiation sources have a quantum efficiency for direct currents deviating from the quantum efficiency for alternating currents according to FIG. 4.
  • Reasons for this are, for example, a thermal inertia and any saturation effects in the light emitting diode.
  • bias current the correction factors for the bias currents of the light emitting diode
  • ⁇ the time slots of the orthogonal codes used so often sent over the optical radiation source until it has conquered thermal equilibrium.
  • a plurality of time slots of the calibration message thus each contain an identical symbol.
  • FIGS. 2 and 3 a temporal flow diagram of exchanged messages for correcting the color coding is shown with reference to FIGS. 2 and 3.
  • a message exchange between the transmitter TX and the receiver RX is assumed, the participating functional units not being defined in the transmitter TX and in the receiver RX.
  • horizontal messages between the transmitter TX and the receiver RX are shown, wherein the respective messages are displayed in a temporal order in which older messages are each shown above recent messages.
  • the transmitter TX sends a compensation request message RACCC to the receiver RX.
  • the compensation request message RACCC is preferably designated by the term "Request AC Color Compensation”.
  • the compensation request message RACCC contains sender-side calibration information, which is also referred to as the "AC training frame". This calibration information is present in a header (message header entry) of a data packet at the hardware level (physical layer) or, alternatively, in a header at the data link layer or MAC level (media access control) of the compensation request message RACCC forming data packets.
  • the Ka ⁇ libr michsvo serve the receiver RX to a calculation and / or estimation of the currently prevailing channel characteristics.
  • the corresponding values of the channel matrix are stored in a reference channel property matrix Ho.
  • This confirmation message is preferably named with the abbreviated designation "Ack AC" ("Acknowledge").
  • the receiver RX confirms, in addition to a successful reception of the compensation request. at the same time that it is capable of carrying out the color stabilization method described here with respect to the AC characteristic of the quantum efficiency.
  • the acknowledgment message AACCC may also include additional status and / or feature information, which, however, will not be discussed further below.
  • this confirmation message AACCC is omitted or it is returned with a corresponding negative entry to the transmitter TX, this means that the receiver RX is not able to perform a color stabilization process with respect to the AC characteristic of the quantum efficiency. If the acknowledgment message is not received within AACCC egg ner predefined waiting time at the transmitter TX, is provided, that the transmitter TX again a - not dargestell ⁇ te - compensation request message RACCC sends to the receptions and seminars ⁇ ger RX. Said predefined waiting time before ⁇ preferably also with the name abbreviating
  • a training request message TRAC is sent by the sender TX to the receiver RX.
  • This training request feature, TRAC is preferably referred to by the abbreviation "Training AC.”
  • the training request message TRAC contains calibration information required for the color stabilization process with respect to the AC characteristic of the quantum efficiency.
  • the current channel properties on the receiver side are derived and stored in a channel property matrix H '.
  • the compensation information message CCAC is preferably designated by the term "AC compensation coefficients”.
  • the transmitter TX again sends a training request message TRAC as above be ⁇ written, whereupon the receiver RX the current channel 'updated property matrix H, calculates the compensation vector c and the result to the transmitter TX with a wide ⁇ ren compensation information message CCAC returns.
  • This cycle is repeated at a frequency which corresponds to the reciprocal of the cycle time TC. The repetition occurs until the transmitter TX sends a termination message ECC to the receiver RX.
  • the said termination message ECC is preferably also with the term
  • the transmitter TX sends a compensation request message RADCC to the receiver RX.
  • the compensation request message RADCC is preferably referred to by the term »Request AC & DC Color Compensation «.
  • the compensation request message RADCC contains sender-side calibration information, which is also referred to as the "AC & DC training frame".
  • This calibra ⁇ insurance information are in a header (Nachzin- entry) of a data packet at the hardware level ( “Physical Lay ⁇ it") before, or, alternatively, in a header at the data link layer or MAC layer ( "Media Access Control”) of the Kompensationsan horrsnachricht RADCC forming pa ⁇ kets.
  • the calibration information is used by the receiver RX to calculate and / or estimate the currently available channel properties.
  • the corresponding values of the respective channel matrix for the AC behavior and for the DC behavior are stored in two reference channel characteristic matrices Ho and HODC.
  • the receiver RX After storing the reference channel property matrices Ho and HODC in the receiver RX, the latter sends an acknowledgment message AADCC to the transmitter TX.
  • This confirmation message will be ⁇ vorzugt named by abbreviating term "Ack AC &DC.”
  • the receiver RX With the acknowledgment message AADCC, in addition to successfully receiving the compensation request message RADCC, the receiver RX simultaneously confirms that it is capable of performing the color stabilization method described herein with respect to the combined direct current and alternating current characteristics of the quantum efficiency.
  • the confirmation message AADCC may also include additional status and / or Leis ⁇ processing feature information, which, however, the will not be executed HEREINAFTER.
  • this acknowledgment message AADCC is omitted, or if it is sent back to the transmitter TX with a corresponding negative entry, this means that the receiver RX is not able to carry out a color stabilization process with respect to the direct current and alternating current characteristics of the quantum efficiency.
  • the acknowledgment message is not received AADCC a predefined waiting time at the transmitter TX in ⁇ nergur, it is provided that the transmitter TX again a - not shown in figure 3 - compensation request message RADCC sends to the receiver RX.
  • the said predefined waiting time is preferably designated by the abbreviated designation "macAckColorCompWaitTime".
  • a training request message TRAD is sent by the transmitter TX to the receiver RX.
  • This training request message TRAD is preferably referred to by the abbreviated designation »training AC & DC «.
  • the training request tracking TRAD contains calibration information required for the color stabilization process with respect to the DC and AC characteristics of the quantum efficiency.
  • the current channel characteristics at the receiver side are derived and stored in a respective channel property matrix H 'and H' DC.
  • a receiver-side compensation scheme which in the proposed amendment to the standard IEEE 802.15.7, Yokoi et al. : "Modified Text Clause 6.9.2.2," January 17, 2010, Document Identification "15-10-0036-00-0007" is shown, rather than the current channel property matrices H 'and H' DCr, rather than the receiver-side stored reference channel property matrix Ho and HODC as a basis for compensation ("equalization") of spectral changes in optical power.
  • ⁇ specifically a respective compensation vector c and CDC be ⁇ calculates in the receiver RX, which from the receiver RX to the transmitter TX with the aid of a compensation information message CCAD sent becomes.
  • the compensation information message CCAD is preferably designated by the term »AC & DC compensation coefficients «. After receipt and evaluation of this compensation information message CCAD in the transmitter TX, the latter decides whether a correction is appropriate. If this decision is positive, the vector elements of the compensation vectors c and CDC are multiplied in the correction elements Ci, Cj, Ck. In this case, the DC values of the driver current, also known as bias current, are multiplied by the corresponding values of CDC, while the information-carrying values AC values of the driver current are multiplied by the corresponding values of c.
  • the transmitter TX After a predetermined cycle time TC, the transmitter TX again sends a training request message TRAD as above be ⁇ written, whereupon the receiver RX 'updates the current channel characteristic matrix H, calculates the compensation vector c and returns the result to the transmitter TX with of a further compensation information message CCAD.
  • This cycle is repeated at a frequency which corresponds to the reciprocal of the cycle time TC. The repetition occurs until the transmitter TX sends a termination message ECC to the receiver RX.
  • the said termination message ECC is preferably also with the term
  • command-frame identifier an identifier
  • Table 1 indicates whether the messages in which the respective identifier is inserted, in the context of stabilizing the AC characteristic (“AC color stabilization”) or in the frame combined stabilization of the DC and AC characteristics (»AC & color stabilization «) of quantum efficiency.
  • the identifier is associated with its respective name ("command name").
  • the AC-related compensation request message RACCC preferably designated by the term "Request AC Color Compensation ⁇ tion,” is used to initiate a color stabilization séessVM with respect to the AC characteristic of the quantum efficiency, in the course of which a transfer of AC-related compensation information.
  • the structure of this AC-related compensation request message RACCC follows the general structural ⁇ structure according to Table 2 and is illustrated in its specific expression in the Table 4 below.
  • Table 4 As identifier ("Command-frame identifier") in Table 4, the identifier defined in Table 1 OxOf with the name "AC color stabilization” is entered. The method identifier 0x00 defined in Table 3 is entered in Table 4 with the designation »Request color compensation «. Another field is not used (with an information length of zero octets) and is therefore marked with "N / A" or "non-applicable”.
  • the DC and AC-related compensation Sanforde ⁇ approximately message RADCC preferably designated by the term 'Request AC & DC Color Compensation ", a combined DC and AC characteristics of the quantum efficiency is to initiate a color stabilization procedures concerning used in the course of transmission of a DC and AC circuits related Compensation information is done.
  • the structure of these compensators AC related tion request message RADCC follows the general structural ⁇ structure according to Table 2 and is illustrated in its specific expression in the Table 5 below.
  • Table 5 identifies the identifier 0x10 defined in Table 1 as "AC & color stabilization”.
  • Table 5 shows the process code 0x00 defined in Table 3 with the term »Request color compensation «.
  • Another field is not used (with an information ⁇ length of zero octets) and is labeled with "N / A” or "non-applicable”.
  • the alternating current-related acknowledgment message AACCC preferably designated by the term "Ack AC" before ⁇ is, for Bes ⁇ actuation of successful reception of Kompensationsanfor- alteration message RACCC while confirming that the requested color stabilization process can be carried out at the receiver end, are used.
  • the structure of this AC-related acknowledgment message AACCC follows the general structure according to Table 2 and is shown in its specific form in the following Table 6.
  • the identifier OxOf defined in Table 1 is entered in Table 6 with the term "AC color stabilization”.
  • Another field with a definable information length (“user-defined”) optionally contains status and / or feature information.
  • the DC and AC circuits related confirmation message AADCC preferably designated by the term “Ack AC &DC” is the acknowledgment of successful reception of compen- RADCC sationsan horrsnachricht while for Bes ⁇ actuation that the requested color stabilization process can be carried out at the receiver end, are used.
  • the structure of this DC and AC-related confirmation message AADCC follows the general structure according to Table 2 and is shown in its specific form in the following Table 7.
  • the AC-related training request message TRAC preferably denoted by the term »training AC «, ent ⁇ holds for the color stabilization method with respect to the change current characteristic of the quantum efficiency required calibration information.
  • the structure of this AC-related training request message TRAC follows the gene ⁇ tural structure according to Table 2 and is illustrated in its specific expression in the Table 8 below.
  • Table 8 contains the identifier OxOf defined as "AC color stabilization” defined in Table 1.
  • process identifier is defined in Table 3 process identifier
  • samplementer-defined contains the transmitter side gebil ⁇ finished calibration information.
  • the length of this field depends on the length of the training sequences, which in turn depend on selected code sequences and other implementation details.
  • MHR Message Header
  • ningsan horrsnachricht TRAC, ie on the backup layer ⁇ or MAC level (»Media Access Control «)
  • these are present in a header of a data packet at the hardware level (physical layer).
  • the DC and AC-related training request message TRAD ⁇ preferably designated by the term "Training AC &DC," the combined direct and alternating current characteristic of the quantum efficiency includes respect required calibration information for the color stabilization process.
  • the structure of this AC related training request message TRAC follows the general structure according to Table 2 and is shown in its specific form in Table 9 below.
  • the identifier 0x10 defined in Table 1 is entered in Table 9 with the designation "AC & color stabilization”.
  • the method identifier in Table 9 is the procedure defined in Table 3. 0x02 with the designation »Color-compensation training «.
  • Another area with a definable information length ( “Implementer-defined”) contains the transmitter side ge ⁇ formed calibration information. The length of this field depends on the length of the training sequences, which in turn depend on selected code sequences and other implementation details. In this embodiment, it is assumed that the calibration information in the header or MHR ( "Message Header") of the training request message shown in Table 9 TRAD, ie on the backup layer or ⁇ MAC level ( “Media Access Control”) are present.
  • the AC-related compensation information message CCAC preferably designated by the term "AC compensation coefficients", is used to transmit the compensation information, more specifically the AC-related compensation vector c, from the receiver RX to the transmitter TX.
  • the structure of this AC-related compensation information message CCAC follows the general structure of Ta ⁇ beauty 2 and is illustrated in its specific expression in the following Table 10 below.
  • Table 10 As an identifier ("Command-frame identifier"), the identifier OxOf defined in Table 1 is entered in Table 10 with the term "AC color stabilization”. The procedure identifier 0x03 defined in Table 3 is entered in Table 8 with the designation »Color-compensation coefficients «.
  • Another field with a Informati ⁇ onsplic of six octets contains the vector values of the AC related compensation vector c.
  • the equal and AC-related Kompensationsinformati ⁇ onsnachricht CCAD preferably referred to by the term »AC & DC compensation Coefficients «, is used to transmit the compensation information, more precisely the same and AC-related compensation vectors c and Coc r from the receiver RX to the transmitter TX used.
  • the structure of this AC-related compensation information message CCAD follows the general structure according to Table 2 and is shown in its specific form in Table 11 below.
  • Table 11 identifies the identifier 0x10 defined in Table 1 as "AC & color stabilization”.
  • the process identifier in Table 11 is the procedure defined in Table 3. 0x03 with the designation »Color-compensation coefficients «.
  • a subsequent field ei ⁇ ner information length of six octets contains the vectorial values of the alternating current-related compensation vector c.
  • Another field with an information length of just six octets contains the vectorial values of the DC-related compensation vector CDC-
  • the termination message ECC preferably termed end color compensation, is used to complete the color stabilization process.
  • the structure of this AC-related termination message ECC follows the ge ⁇ nerellen structure according to Table 2 and is shown in their specific form in the following Table 12.
  • identifier in Table 12, depending on the type of color stabilization process to be terminated, the identifier defined in Table 1 is OxOf with the designation "AC color stabilization” or the identifier 0x10 with the designation "AC & de color stabilization” entered.
  • Another field is added (with an information mation length of zero octets) and is therefore marked with "N / A" or "non-applicable”.

Landscapes

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

Abstract

L'invention concerne un procédé de transfert optique de données entre un émetteur et un récepteur, dans lequel un procédé de codage couleur sur la base d'une pluralité de couleurs élémentaires est prévu pour le codage et le transfert des données, une couleur élémentaire respective étant envoyé par une source de rayonnement optique côté émetteur et reçue par un récepteur de rayonnement optique respectif côté récepteur. Le procédé consiste à envoyer un message de requête d'entraînement de l'émetteur au récepteur contenant des informations d'étalonnage constituées côté émetteur; à établir une matrice de propriétés du canal à partir des informations d'étalonnage par le récepteur et à mémoriser cette matrice de propriétés de canal dans le récepteur; à évaluer au moins une information de compensation sur la base d'une matrice de propriétés de canal de référence mémorisée dans le récepteur et de la matrice de propriétés de canal de référence et à envoyer l'information de compensation du récepteur à l'émetteur.
EP11704429A 2010-02-09 2011-02-07 Procédé et agencement de stabilisation d'un procédé de codage couleur lors d'un transfert optique de données Withdrawn EP2514119A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11704429A EP2514119A1 (fr) 2010-02-09 2011-02-07 Procédé et agencement de stabilisation d'un procédé de codage couleur lors d'un transfert optique de données

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP10001317 2010-02-09
EP11704429A EP2514119A1 (fr) 2010-02-09 2011-02-07 Procédé et agencement de stabilisation d'un procédé de codage couleur lors d'un transfert optique de données
PCT/EP2011/051753 WO2011098425A1 (fr) 2010-02-09 2011-02-07 Procédé et agencement de stabilisation d'un procédé de codage couleur lors d'un transfert optique de données

Publications (1)

Publication Number Publication Date
EP2514119A1 true EP2514119A1 (fr) 2012-10-24

Family

ID=43923711

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11704429A Withdrawn EP2514119A1 (fr) 2010-02-09 2011-02-07 Procédé et agencement de stabilisation d'un procédé de codage couleur lors d'un transfert optique de données

Country Status (5)

Country Link
US (1) US20120308229A1 (fr)
EP (1) EP2514119A1 (fr)
KR (1) KR20130016215A (fr)
CN (1) CN102742186A (fr)
WO (1) WO2011098425A1 (fr)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010007273A1 (de) * 2009-11-18 2011-06-01 Siemens Aktiengesellschaft Verfahren und Anordnung zur Stabilisierung eines Farbkodierungsverfahrens bei einer optischen Übertragung von Daten
CN103314533A (zh) * 2011-01-18 2013-09-18 西门子公司 用于可见光通信系统中色移键控星座的编码方案和方法
US20150104184A1 (en) * 2013-09-16 2015-04-16 Clutch Authentication Systems, Llc System and method for communication over color encoded light patterns
US20150155937A1 (en) * 2013-09-16 2015-06-04 Clutch Authentication Systems, Llc System and method for communication over color encoded light patterns
US9548814B2 (en) * 2013-09-16 2017-01-17 Clutch Authentication Systems, Llc System and method for communication over color encoded light patterns
US20150155938A1 (en) * 2013-09-16 2015-06-04 Clutch Authentication Systems, Llc System and method for communication over color encoded light patterns
US9787404B2 (en) * 2013-09-16 2017-10-10 Clutch Authentication Systems, Llc System and method for communication over color encoded light patterns
CN104079353A (zh) * 2014-07-17 2014-10-01 中国人民解放军信息工程大学 一种基于颜色调制的可见光通信方法和系统
CN105141361B (zh) * 2015-09-18 2018-06-12 东南大学 一种基于色移键控的多色空间调制方法及光通信方法
US10488525B2 (en) * 2016-11-16 2019-11-26 Topcon Positioning Systems, Inc. Method and system for demodulating and tracking of CSK-modulated signals
CN108039912B (zh) * 2017-12-12 2020-04-21 中山大学 一种可实现非正交多址接入的多层色移键控调制方法
US11632346B1 (en) * 2019-09-25 2023-04-18 Amazon Technologies, Inc. System for selective presentation of notifications
CN113177326B (zh) * 2021-05-20 2022-10-25 清华大学 一种无线光非视距通信链路中存在反射面的信道特性分析方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8483200B2 (en) * 2005-04-07 2013-07-09 Interdigital Technology Corporation Method and apparatus for antenna mapping selection in MIMO-OFDM wireless networks
KR100866189B1 (ko) * 2007-01-29 2008-10-30 삼성전자주식회사 파장 분할 병렬 가시광 통신에서 가시광 색상 불균형 보정방법 및 장치
JP5031427B2 (ja) * 2007-03-30 2012-09-19 三星電子株式会社 可視光送信装置、可視光受信装置、可視光通信システム、及び可視光通信方法
US7936753B1 (en) * 2007-11-30 2011-05-03 Qlogic, Corporation Method and system for reliable multicast
US8521034B2 (en) * 2009-02-20 2013-08-27 Samsung Electronics Co., Ltd. Apparatus and method for interference mitigation and channel selection for visible light communication

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2011098425A1 *

Also Published As

Publication number Publication date
KR20130016215A (ko) 2013-02-14
CN102742186A (zh) 2012-10-17
US20120308229A1 (en) 2012-12-06
WO2011098425A1 (fr) 2011-08-18

Similar Documents

Publication Publication Date Title
EP2514119A1 (fr) Procédé et agencement de stabilisation d'un procédé de codage couleur lors d'un transfert optique de données
EP2502363B1 (fr) Procédé et système de stabilisation d'un procédé de codage de couleurs lors d'une transmission optique de données
EP2534773B1 (fr) Procédé et système pour stabiliser un procédé de codage chromatique lors d'une transmission optique de données
DE4392993C2 (de) Kommunikationssystem mit einem Signalleistungsabschätzer
EP1563630B1 (fr) Procede de traitement bidirectionnel de signaux pour systeme mimo (a entrees multiples - a sorties multiples) avec adaptation de la vitesse de transmission adaptative au rang
DE60311466T2 (de) Adaptive verstärkungsregelung mit rückkopplung
EP2425558A1 (fr) Procédé et dispositif de transfert optique de données
DE19963816C2 (de) Verfahren und Vorrichtung zur Umsetzung eines bidirektionalen Datenstroms über eine So-Schnittstelle für eine Übermittlung über ein Niederspannungsstromnetz
WO2019053296A1 (fr) Procédé de codage linéaire de signaux pour la transmission redondante de données par l'intermédiaire de plusieurs canaux optiques
EP2514127A2 (fr) Procédé et dispositif de transmission optique de données
DE4008023C2 (fr)
DE10048353A1 (de) Antriebssteuerung für einen elektrischen Antrieb mit sicherer elektrischer Trennung von Leistungsteil und Regelungseinheit
DE19963817C2 (de) Verfahren und Vorrichtung zur Umsetzung eines bidirektionalen Datenstroms über eine S2m-Schnittstelle für eine Übermittlung über ein Niederspannungsstromnetz
EP3669471B1 (fr) Procédé de réception d'un signal optique modulé et unité de réception
DE202021105968U1 (de) Ein maschinelles Lern- und KI-basiertes System zum Übertragen von Signalen in drahtlosen 6G-Kommunikationsnetzwerken
EP1417778B1 (fr) Procede et dispositifs de reglage de la puissance d'emission d'un systeme de communication
DE102021000735A1 (de) Beendigung einer drahtlosen Übertragung eines Datenrahmens
DE112019007107T5 (de) Elektronisches gerät zur unterstützung einer variablen kompressionsrate in abhängigkeit vom funkverbindungszustand
EP1508212B1 (fr) Procede et dispositif de transmission optique de donnees
EP4146577A1 (fr) Dispositif de modulation de lumière d'une installation d'ascenseur et procédé de transmission de modulation de lumière
DE4242733C2 (de) Verfahren zum Austausch von Daten
EP2966794A2 (fr) Dispositif de transmission de signaux de message
DE102015224550A1 (de) Steuerungseinrichtung mit einer Kommunikationseinheit
DE2713919B2 (de) Signalübertragungseinrichtung mit wenigstens einem Signalempfänger
WO2001050627A1 (fr) Systeme pour transmettre un flux de donnees rnis bidirectionnel par l'intermediaire d'un reseau basse tension

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20120717

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: SIEMENS AKTIENGESELLSCHAFT

DAX Request for extension of the european patent (deleted)
GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

RIC1 Information provided on ipc code assigned before grant

Ipc: H04B 10/114 20130101ALI20140708BHEP

Ipc: H04B 10/116 20130101AFI20140708BHEP

INTG Intention to grant announced

Effective date: 20140811

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20140902

REG Reference to a national code

Ref country code: DE

Ref legal event code: R079

Free format text: PREVIOUS MAIN CLASS: H04B0010100000

Ipc: H04B0010110000

REG Reference to a national code

Ref country code: DE

Ref legal event code: R079

Free format text: PREVIOUS MAIN CLASS: H04B0010100000

Ipc: H04B0010110000

Effective date: 20150211