DE10155732B4 - Method for continuous frequency domain estimation of the interference environment for conducted transmission systems - Google Patents

Abstract

Receiving or transmitting / receiving device (14) which is set up so that it receives via a transmission channel, in particular a specific frequency band (16a), modulated transmission signals (3) from a transmitting or a further transceiver (15) can, characterized in that for the estimation of the prevailing Störszenarios an interference power of the transmission channel representing value (σ ² _{n, 0)} is determined, and this value with a plurality of, in each case a specific of a plurality of comparison interference scenarios associated comparison Störleistungswerten (σ ² _{i, 0} ) is compared.

Description

The The invention relates to a receiving device according to the preamble of the claim 1, a data communication system having such a receiving device, and a data transmission method according to the generic term of claim 18. Data communication systems have i.A. one or several transmission or Transceiver devices, from / to which transmission signals e.g. via twisted-pair cables transmitted to one or more receiving or transmitting / receiving devices be, and vice versa.

The Transmitting means may e.g. one in an EWSD terminal (EWSD = Electronic Dialing System Digital) provided electronic assembly, the multiple modems having.

At Each modem has a subscriber line, e.g. a twisted-pair cable connected, over the respective modulated transmission signals e.g. to a provided at a subscriber end terminal Transmit modem become.

Appropriate transmission signals are also used by the subscriber end-user modem sent out (e.g. another twisted-pair line), and the appropriate terminal modem receive.

The Data communication between the modems (modulator-demodulators) can e.g. based on POTS (Plain Old Telephone Service), ISDN (Integrated Services Digital Network), or xDSL (x Digital Subscriber Line) Data transmission protocols take place, e.g. by means of ADSL data transmission or in accordance with the standards ITU G.992.1 (G.dmt) or ITU G.992.2 (G.Lite).

at data communication according to an xDSL protocol become multiple frequency bands (bins) used above that for POTS or ISDN data transmission used frequency bands lie.

For transmission of data over the xDSL frequency bands can e.g. a QAM data transmission method be used. In each case one can in one particular frequency band Cosine vibration whose frequency is e.g. in the Center of the corresponding frequency band is.

Each to be transferred Bit or each to be transmitted Bit sequence is a cosine wave (e.g., using a phase star) assigned to certain amplitude and phase. From the amplitude and Phase of each received cosine oscillation can then in the receiving device the respectively transferred Bit or the respectively transmitted Bit sequence can be determined.

at DSL data transmission method be except the actual payload, e.g. also transfer synchronization data.

The transfer synchronization data occurs during a predetermined, in the DSL standard time period (i.e., during the so-called Synchronization data frame (s)). In the on the synchronization frame following period divided into 68 subsections (User data frame), the actual user data is transmitted.

Of the Synchronization data frame, and the subsequent 68 payload data frames together form one - in total 69 frames - DSL Super or meta-frame.

A for transmitted from the respective transmitting / receiving device Synchronization data bit string is identical synchronization data bit string beforehand in the communicating with the respective Sen / receiving device (further) transmitting / receiving device stored.

There is the received data bit sequence with the previously stored Synchronization data bit string compared. Depending on whether a match can be determined or not, is the respectively received Bit sequence a synchronization data frame, or a payload data frame assigned.

Thereby can be a temporal coordination of DSL data transmission between each sending and the respectively receiving transceiver be achieved.

at the DSL data transmission over a Certain twistedpair wire can do it for a variety of reasons too disorders come. For example, crosstalk interference can occur which are caused by adjacent twisted-pair lines.

at the o.g. DSL standards (ITU G.992.1 (G.dmt) or ITU G.992.2 (G.Lite)) is provided while an initialization phase of the corresponding transmitting / receiving devices (i.e., before the actual data transfer) the disturbance characteristics of the respective transmission channel to determine.

For this purpose, so-called training sequences are transmitted by the respective transmitting device during the initialization phase. These are known in the respective receiving device, and are there with the actually received (disturbed) Training sequences compared. From this, the (instantaneous) disturbance properties of the transmission channel can be determined in a manner known per se.

To Completion of the initialization phase - i. after the beginning of the actual (User) data transfer - be according to the o.g. DSL standards no longer transfer training sequences.

Out this reason can then the (possibly changed) spurious the transmission channel only be determined by statistical means.

From the publication DE 44 01 786 A1 a method is known for receiving-side testing the quality of a transmission channel, are transmitted to the modulated digital data in which a receiving side known training sequence is included at intervals, the data symbols are digitized at the receiving end and then demodulated. The demodulated data signals are compared with the symbols of the stored training sequence, and from the comparison result, a criterion for the currently available quality of the transmission signal is derived.

The Invention has for its object, a novel receiving device, a novel data communication system with such a receiving device, as well as a novel data transmission method to disposal to deliver.

The Invention achieves these and other objects by the objects of claims 1, 15 and 18. Advantageous developments of the invention are in the dependent claims specified.

According to one The basic idea of the invention is a receiving device or a Transceiver provided, which is set up is she over a transmission channel, in particular a particular frequency band, modulated transmission signals received by a transmitting or a further transceiver can, being for estimation the prevailing sturgeon scenario an interference power of the transmission channel representing Value is determined, and this value with several, one each compared to the comparison interference power values assigned to several comparison interference scenarios becomes.

at A preferred embodiment is the receiving or transmitting / receiving device set up so that they over additional transmission channels, in particular other frequency bands further, modulated transmission signals received by the transmitting and the further transceiver can, and being for estimation the prevailing sturgeon scenario several, each the Störleistung representing the further transmission channels Values are determined, and each of the other values with several others, each one of the several comparative Störszenarien assigned comparative interference power values is compared.

Advantageous for comparison, the transmission channel interference power representing Values with the comparative interference power values Difference between the corresponding values formed.

Prefers is an embodiment in which the determination of the the interference power the transmission channel or the further transmission channels representing Value or values the channel transfer function or the channel transfer functions at undisturbed or approximately undisturbed transmission is appreciated.

at In a particularly preferred embodiment, by means of the transmission signals via the or the transmission channels transmit synchronization data, which are used to synchronize the receiving device, the same transmission signals, with which the synchronization data are transmitted, also for estimate the prevailing sturgeon scenario be used.

in the The following is the invention with reference to several embodiments and the attached drawing explained in more detail. In the drawing shows:

1a a schematic representation of a phase star used for the transmission of payload and reference / synchronization data;

1b one at the 1a shown phase star bitmap assignment table used;

1c a schematic representation of a data communication system with transceivers according to the present invention;

1d a schematic representation of the frequency bands used by a transmitting / receiving device according to the invention for POTS or ISDN, and for DSL data transmission;

2 a cosine wave used for payload and reference / synchronization data transfer;

3 another cosine wave used for payload and reference / synchronization data transfer;

4 a third cosine wave used for payload and reference / synchronization data transfer;

5 a schematic representation of a super frame used in the invention for Nutz- and reference / synchronization data transmission; and

6 a schematic representation of the process of the in 1c Stranger scenario estimate used used transmitting / receiving device.

In 1c is an example of a data communication system 9 shown in accordance with the present invention.

The data communication system 9 has one to a telephone network (here: the public telephone network 10 ) affiliated local exchange 11 (here: an electronic dialing system digital or EWSD). In the local agency 11 are several transceivers 15 provided via subscriber lines 12 , eg twisted-pair lines each with transmit / receive devices 14 connected to subscriber terminations 13 are arranged.

The twisted pair cables each consist of two wires 12a . 12b , For data transmission via the respective wire pairs differential or symmetrical signals are used.

The data communication between those in the local exchange 11 provided transmitting / receiving devices 15 and the transceivers 14 the subscriber end-user devices 13 takes place by means of POTS (Plain Old Telephone Service) or ISDN (Integrated Services Digital Network) voice data transmission, as well as by means of xDSL (x Digital Subscriber Line) data transmission.

According to 1d become more in a frequency range during xDSL data transmission 16 lying frequency bands (bins) 16a . 16b . 16c . 16d . 16e used (here: M different frequency bands), which are above a frequency f1. The frequency range 17 below the frequency f1 is used for conventional POTS or ISDN voice data transmission. In the case of POTS data transmission, f1 is about 25 kHz, and in the case of ISDN data transmission about 130 kHz.

For DSL data transmission between respective terminal exchange transceivers 15 and subscriber transceivers 14 (and vice versa), for example, a QAM method can be used. Here are for each of the above M different DSL frequency bands 16a . 16b . 16c . 16d . 16e Cosine carrier oscillations used whose frequencies, for example, each in the middle of the corresponding frequency band 16a . 16b . 16c . 16d . 16e can lie.

For coding of data (eg user data, as well as reference / synchronization data) in a cosine oscillation, the in 1a shown phase star 1 be used.

As will be explained in more detail below, the reference / synchronization data serve as explained here embodiment for estimation of the transmission channel used prevailing disturbance scenarios, as well as for the synchronization of the user data transmission.

The phase star 1 has in the present embodiment, three concentric circles, which according to the illustration below is assigned in each case a vibration amplitude A1, A2, A3 of certain height. On these circles are here total 16 Points a, b, c, d, f (or, in other words, 16 arranged in the complex number plane lying symbols a, b, c, d, f), which here each one of 16 associated with different sequences of 4 bits.

Four points a, b, d, e (or four arranged in the complex number plane symbols a, b, d, e), each at an angle φ1, φ2, φ3 and φ4 of 45 °, 135 °, 225 ° or 315 ° on the innermost, the first amplitude A1 associated circle is, according to the in 1b shown allocation table 2 in each case assigned the bit sequence "1010", "0101", "1001" or "0110".

In a corresponding manner is according to 1a four further points c, f (or symbols c, f) lying at corresponding angles φ1, φ2, φ3 and φ4 of 45 °, 135 °, 225 ° and 315 °, respectively, on the outermost circle associated with the third amplitude A3. according to the in 1b shown allocation table 2 each assigned the bit sequence "1100", "1111", "0000" or "0011".

The remaining bit sequences ("1101", "1110", "1000", "1011", "0100", "0111", "0001", "0010") are assigned to 8 points (or symbols) that are located on the middle lying at the second amplitude A2 associated circle, respectively at angles φ5, φ6, φ7, φ8, φ9, φ10, φ11 and φ12 of approximately 20 °, 70 °, 110 °, 160 °, 200 °, 250 °, 290 ° and 340 °, respectively.

For the transmission of user data, or for the transmission of reference / synchronization data from the local exchange transceiver 15 to the respective subscriber terminal connection transceiver 14 , and vice versa, becomes (in each case parallel in each of the above-mentioned frequency bands 16a . 16b . 16c . 16d . 16e ) a sequence of several cosine oscillations transmitted in succession, each lasting a certain period of time 3 . 4 . 5 transferred (cf. 2 . 3 . 4 ).

All cosine oscillations 3 . 4 . 5 have - depending on the frequency band used in each case - a specific, constant, as explained above, respectively in the middle of the corresponding frequency band 16a . 16b . 16c . 16d . 16e lying frequency.

Every cosine oscillation 3 . 4 . 5 indicates in each case a specific one of the above-mentioned bit sequences, specifically via the height of the oscillation amplitude A1, A2, A3, and via the phase shift Δφ of the respective oscillation 3 . 4 . 5 to one in the respective transceivers 14 . 15 synchronously running basic clock, or with respect to one of the respective transmitting / receiving device 15 emitted pilot tone vibration.

The amplitude A1, A2, A3 used in each case corresponds to that amplitude which corresponds to that of the circle in 1a shown phase star 1 is assigned, on which the point or the symbol a, b, c, d, e, f is located, which is assigned to each bit sequence to be transmitted.

In a corresponding way, the phase shift Δφ of the respective cosine oscillation 3 . 4 . 5 selected such that it corresponds to the above-mentioned angle φ1, φ2, φ3, φ4, φ5, φ6, φ7, φ8, φ9, φ10, φ11 and φ12 of the point or symbol a, b, c, d respectively assigned to the bit sequence to be transmitted , e, f in the phase star 1 equivalent.

For example, the in 2 shown cosine oscillation 3 by their amplitude A1, and their phase shift of Δφ = 45 ° which the point or the symbol a on the phase star 1 associated bit string "1010", which is in 3 shown cosine oscillation 4 by the amplitude A1, and the phase shift of Δφ = 135 °, the bit sequence "1001" assigned to the point or the symbol d, and the in 4 shown cosine oscillation 5 by their amplitude A3, and their phase shift of Δφ = 135 °, the bit sequence "1100" assigned to the point or the symbol c.

If, for example, the data bit sequence "101010011100" is to be transmitted as a user data or as a reference / synchronization data bit sequence, this can be done by, for example, using the terminal exchange / receiving device 15 to the subscriber terminal transceiver 14 (or vice versa) one after the other in the 2 . 3 and 4 shown cosine oscillations 3 . 4 . 5 be transmitted.

According to the DSL protocol takes place in each frequency band 16a . 16b . 16c . 16d . 16d the data transmission in each case at predetermined time intervals, ie within certain frames or frames instead. As in 5 is shown, there are several (here: 69) different, each lasting a predetermined period of time frame 1a . 2a . 3a , ..., 69a to a meta or super frame 6 summarized (on the one another, corresponding to the meta-frame 6 constructed meta-frame follows, etc.). The meta-frame 6 For example, they may each have a duration of 10 - 25 ms, in particular of about 17 ms.

According to DSL protocol introduces the first frame 1a of the meta-frame 6 a so-called synchronization frame on which several (here: 68) data frames 2a . 3a , ..., 69a consequences.

According to the DSL protocol, the data frames are used 2a . 3a , ..., 69a for transmitting user data, and reference data. In contrast, in the present embodiment, within the data frames 2a . 3a , ..., 69a transmit only user data.

Furthermore, according to the DSL protocol, the synchronization frame or the first frame is used 1a for transmission of synchronization data. As explained in more detail below, in the present exemplary embodiment, these are also used as reference data, except for synchronization, in particular for carrying out a method for determining the quality of the respective transmission channel or for estimating the respective interference scenario prevailing in the transmission channel used.

In an alternative, not shown embodiment, it is conceivable that (alternatively or additionally) in a known manner reference data during one or more of the synchronization frame 1a following data frame 2a . 3a . 69a be transmitted.

In 6 is a - schematic - representation of the process of the in 1c shown subscriber terminal side transmitting / receiving device 14 used the interference scenario estimation method (or the transmission channel quality determination procedure).

A similar procedure can also be found in the local exchange 11 arranged transmitting / receiving device 15 be used.

In the subscriber terminal side transmitting / receiving device 14 are the over the subscriber line 12 from the local exchange 11 received analog signals in an analog-to-digital converter (not shown) converted into (serial) digital signals on a line 7 be issued.

The sequence of discrete signal values output by the analog-to-digital converter then becomes, as in FIG 6 is shown, over the line 7 a serial / parallel converter 8th supplied, and converted there into corresponding parallel digital signals.

The parallel, digital signals are transmitted over a trunk group 18 a Fourier transform device 19 fed. There, with the aid of a DFT method (DFT = discrete Fourier transformation) in each case the amplitude A _k and phase Δφ _{k of} the above-mentioned M different cosine carrier vibrations 3 . 4 . 5 (shown here by the M cosine carrier vibrations 3 . 4 . 5 assigned (complex) symbol values Y _k ).

The amplitudes A _k and phases Δφ _k (or the M (complex) symbol values Y _k ) are formed via a trunk group consisting of several different lines 20 for further signal processing a (not shown) evaluation supplied. There will be - with the help of a in 1a shown phase star 1 corresponding phase star - from the amplitudes A _k and phases Δφ _{k of} the received M cosine carrier vibrations 3 . 4 . 5 (or the M cosine carrier vibrations 3 . 4 . 5 assigned M (complex) symbol values Y _k ) determines the respectively transmitted bits or the respectively transmitted bit sequences.

The determined bit sequences are also stored in a memory device (not shown) of the transmitting / receiving device 14 stored reference / synchronization data bit strings compared.

Depending on whether or not a match can be determined, the respective received bit strings may be subject to a synchronization frame 1a , or a data frame 1a . 2a . 3a be assigned (see. 5 ). By doing that during the synchronization frame 1a the above-mentioned reference / synchronization data bit sequences are transmitted, that is to say a temporal coordination of the DSL data transmission between the respectively transmitting and the respectively receiving transmitting / receiving device 14 . 15 be achieved.

As in 6 is further shown, the M cosine carrier vibrations 3 . 4 . 5 associated M (complex) symbol values Y _k over a trunk group consisting of several different lines 21 a transfer function estimator 22 fed.

If it is determined by the abovementioned evaluation device that a reference / synchronization data bit sequence has been received, the transmission function estimation means 22 for each of the above-mentioned M cosine carrier vibrations 3 . 4 . 5 or for each of the above-mentioned M frequency bands 16a . 16b . 16c . 16d . 16e the respective (channel) transfer function H _{k is} estimated.

For everyone in the transceiver 14 received (complex) symbol value Y _k (ie also for the relevant here, during a synchronization frame 1a received (complex) symbol values Y _k ) applies - considered in the frequency domain - the following formula: Y k = H k S k + N k (Formula 1))

It is H _{k is} the k th-for the channel or the k-th frequency band 16a . 16b . 16c . 16d . 16e (the total of M channels or M frequency bands) applicable (channel) transfer function, N _k that at the respective frequency band 16a . 16b . 16c . 16d . 16e (instantaneously) interfering signal, and S _{K is} the (complex) symbol value to be transmitted (with an amplitude and a phase which corresponds to the amplitude and phase of the point or symbol a, b, c, d, e, f), which or which according to the in 1 illustrated phase star 1 is assigned to each bit or bit string to be transmitted).

As already explained, are in the transmitting / receiving device 14 during a synchronization frame 1a transmitted reference / SYnchronisationsdatenbitfolgen known, and thus the latter in a the 1 Phase stars shown corresponding phase star respectively associated (complex) symbol values S _k .

The (complex) symbol values S _k become from the above-mentioned (not shown here) storage device of the transmitting / receiving device 14 read out, and according to 6 via a cable bundle consisting of several different lines 23 the transfer function estimator 22 fed.

In order to determine the (channel) transfer function H _k that applies to the k-th channel, the transfer function estimator is used 22 For each of the M channels or M frequency bands 16a . 16b . 16c . 16d . 16e separately - the expected value of the quotient Y _k / S _k determined, for example by averaging (for example, using 10, 100 or 1000 consecutive, corresponding symbol values Y _k and S _k , for example, this one and the same synchronization frame 1a , or for example also be associated with a plurality of consecutive synchronization frames).

Expressed in terms of formula, the transfer function estimation means is thus used 22 for determining the transfer function H _{k of} the k-th of the total M carriers, the following operation is performed: H k = E {Y k / S k } (Formula (2)) where E {...} is a mathematical expectation operator.

In the DSL data transmission via the above-mentioned twisted pair line 12 There may be disruptions for a variety of reasons. In particular, crosstalk disturbances can occur that are caused by adjacent twisted-pair lines - in particular when a DSL data transmission is currently being carried out via one (or more) adjacent twisted-pair line.

The corresponding disturbances are generally not correlated with the useful signal, so that the respective interference signals N _k (cf., the above formula (1)) in the above expected value or Mittwelwertbildung (considering a sufficiently high number of symbols Y _k or S _k ) in total.

The M (complex) transfer function values [H ₀ , H ₁ ,... H _M-1 ] valid for the M carriers are determined according to 6 an interference power distribution determining means 25 provided (eg via a cable bundle consisting of several different lines 24 ) (Note: the functions of the interference power dissipation determination means 25 , the transfer function estimator 22 , a disturbance scenario investigator explained in detail below 26 , etc., can be met, for example, by a plurality of microprocessors communicating with one another in a suitable manner, or for example also by one and the same microprocessor).

By the interference power distribution determining means 25 then becomes - for each of the M channels or M frequency bands 16a . 16b . 16c . 16d . 16e separately - the expected value of the interference signal power determined, for example by averaging (eg using the transfer function estimation means 22 determined M transfer function values H _k , and the above-mentioned example, 10, 100 or 1000 consecutive corresponding symbol values Y _k and S _k ).

For this purpose, the symbol value Y _k '= H _k S _k resulting from the - actually received, noisy - symbol value Y _{k is} subtracted, and the resulting (complex) difference value W for determining the noise signal power multiplied by the conjugate complex difference value W *.

Expressed in terms of formula, in the interference power distribution determining means 25 So - for each of the M channels or frequency bands 16a . 16b . 16c . 16d . 16e separately - performed the following operation: E {(Y k - H k S k ) (Y k - H k S k ) *} = E {(Y k - Y k ') (Y k - Y k ') *} = E {WW *} = E {| N k | 2 } = σ 2 N, k (Formula (3))

Here, E {...} denotes a mathematical expected value operator, and σ ² _{N, k} - for the k-th of the total of M channels - the expected value, eg the mid-wave value, of the interfering signal power.

The M noise signal power expectation values [σ ² _{N, 0} , σ ² _{N, 1} ,. .. σ ² _{N, M-1} ] then become the above-mentioned interference scenario determination means 26 provided (eg via a cable bundle consisting of several different lines 27 ).

As in 6 is further shown in the memory device (not shown) of the transmitting / receiving device 14 a table 28 is stored. In this are - each associated with a particular of a plurality of (eg i = 2, i = 3, i = 4, etc.) conceivable Störszenarien - each for the respective Störszenario for each M channels expected Störsignalleistungs values σ ² _{i, k are} stored (eg in the form of i vectors [σ ² _{i, 0} , σ ² _{i, 1} , ..., σ ² _{i, M-1} ]).

The interference signal (comparison) power values σ ² _{i, k} assigned to the various interference scenarios correspond, for example, to the interference signal power values defined in the DSL standard, or become the corresponding transmission / reception device in the course of an initialization or training phase 14 (ie before the actual data transmission) determined (for example, by playing through different Störszenarien, this case each occurring Störsignalleistungs values σ ² _{i, k} measured, and stored under assignment to the respective Störszenario in the above table 28. In each Störszenario can eg different, to the twisted pair cable 12 adjacent, or via different combinations of adjacent twisted pair lines DSL data transmission can be performed, resulting in different crosstalk interference effects on the twisted pair line 12 leads).

To determine the most probable jamming scenario, the jamming scenario determining means 25 For each of the i sturgeon scenarios, for each of the M carriers, the difference D between the respective ones of the interference power distribution determination means 25 supplied interference signal power value σ ² _{N, k} , and the corresponding interference signal power comparison value σ ² _{i, k} formed (σ ² _{N, k} - σ ² _{i, k} ), and formed by the resulting Diferenzwert the amount (| σ ² _{N , k} , - σ ² _{i, k} |).

The difference magnitude values resulting for the respective ith sturgeon scenario for each of the M carriers are summed from k = 0 to k = M-1 (D _i = Σ _k | σ ² _{N, k} -σ ² _{i, k} | ).

From the one of the i sturgeon scenarios, For which If the lowest sum value Di results, it is assumed that it is the currently prevailing sturgeon scenario.

Depending on the respectively determined interference scenario, for example, in the communication between the transmitting / receiving devices 14 . 15 the data rate adjusted accordingly, eg increased, or reduced.

1

phase star

1a

synchronization frame

2

allocation table

2a

data frames

3

cosine wave

3a

data frames

4

cosine wave

5

cosine wave

6

Meta-framework

7

management

8th

Serial / parallel converter

9

Data communication system

10

telephone network

11

local exchange

12

Subscriber line

12a

Vein

12b

Vein

13

Subscriber Endanschlußeinrichtung

14

Transmitting / receiving device

15

Transmitting / receiving device

16

frequency range

16a

frequency band

16b

frequency band

16c

frequency band

16d

frequency band

16e

frequency band

17

frequency range

18

trunk group

19

Fourier transform means

20

trunk group

21

trunk group

22

Transfer function estimating means

23

trunk group

24

trunk group

25

Störleistungsverteilungs determining means

26

Interference scenario determining means

27

trunk group

28

table

69a

data frames

Claims (18)

Receiving or transmitting / receiving device ( 14 ) which is set up so that it can communicate over a transmission channel, in particular a specific frequency band ( 16a ), modulated transmission signals ( 3 ) from a transmitting or a further transmitting / receiving device ( 15 ), characterized in that a value representing the disturbing power of the transmission channel (σ ² _{N, 0} ) is determined for estimating the respectively prevailing interference scenario, and this value is associated with a plurality of comparison interference power values respectively associated with a specific one of a plurality of comparison interference scenarios ( σ ² _{i, 0} ) is compared. Receiving or transmitting / receiving device ( 14 ) according to claim 1, which is set up so that it can communicate via further transmission channels, in particular further frequency bands ( 16b . 16c ) further, modulated transmission signals ( 4 . 5 ) from the transmitting or the further transceiver device ( 15 ), and wherein in order to estimate the respectively prevailing interference scenario, several, respectively the interference power of the further transmission channels ( 12 ) (σ ² _{N, k} ) are determined, and each of the further values is in each case compared with a plurality of further comparison interference power values (σ ² _{i, k} ) assigned to a specific one of the plurality of comparison interference scenarios. Receiving or transmitting / receiving device ( 14 ) according to any one of the preceding claims, wherein for comparing the value representing the transmission channel interference power (σ ² _{N, k} ) with the comparison interference power values (σ ² _{i, 0} , σ ² _{i, k} ) Difference between the corresponding values is formed. Receiving or transmitting / receiving device ( 14 ) according to claim 3, in which the comparison disturbance scenario is determined as the currently prevailing disturbance scenario for which the amount of the difference or the sum of the amounts of the differences is minimal. Receiving or transmitting / receiving device ( 14 ) according to one of the preceding claims, in which the value or values representing the interference power of the transmission channel or of the further transmission channels is determined in order to determine the or the interference power (σ ² _{N, 0} , σ ² _{N, k} ) the channel transfer function or the channel transfer functions (H ₀ , H _k ) is estimated in undisturbed or approximately undisturbed transmission. Receiving or transmitting / receiving device ( 14 ) according to one of the preceding claims, wherein by means of the transmission signals ( 3 . 4 . 5 ) Synchronization data is transmitted, which is used to synchronize the receiving device ( 14 ) and the same transmission signals ( 3 . 4 . 5 ), with which the synchronization data are transmitted, are also used to estimate the prevailing sturgeon scenario. Receiving or transmitting / receiving device ( 14 ) according to Claim 6, in which the synchronization data comprise a synchronization data bit sequence which is used for synchronization of the receiving or transmitting / receiving device ( 14 ) with an advance in a storage device ( 19 ) of the receiving or transmitting / receiving device ( 14 ) is compared. Receiving or transmitting / receiving device ( 14 ) according to one of the preceding claims, in which each bit or bit sequence to be transmitted has a transmission signal ( 3 . 4 . 5 ) of certain amplitude (A1) and phase (φ1) is assigned. Receiving or transmitting / receiving device ( 14 ) according to one of the preceding claims, in which the transmission signals are transmitted via a transmission line ( 12 ) be transmitted. Receiving or transmitting / receiving device ( 14 ) according to claim 9, wherein the transmission line ( 12 ) is a telephone subscriber line. Receiving or transmitting / receiving device ( 14 ) according to claim 9 or 10, wherein the conduit ( 12 ) is a two-wire line. Receiving or transmitting / receiving device ( 14 ) according to one of the preceding claims, in which the transmission signals ( 3 . 4 . 5 ) Are QAM-modulated signals. Receiving or transmitting / receiving device ( 14 ) according to one of the preceding claims, in which the transmission signals ( 3 . 4 . 5 ) Are DSL modulated signals. Receiving or transmitting / receiving device ( 14 ) according to one of the preceding claims, in which the transmission signals ( 3 . 4 . 5 ), which for the synchronization of the receiving or transmitting / receiving device ( 14 ) and used to estimate the prevailing disturbance scenario during a synchronization frame ( 1a ) be transmitted. Data communication system ( 9 ), which a receiving or transmitting / receiving device ( 14 ) according to one of claims 1 to 14. Data communication system ( 9 ) according to claim 15, which comprises a transmitting or a further transmitting / receiving device ( 15 ) from which the modulated transmission signals ( 3 . 4 . 5 ) via the transmission channel to the receiving or transmitting / receiving device ( 14 ) be transmitted. Transmitting or transmitting / receiving device ( 15 ), which is designed and set up such that it can be used as a transmitting or further transmitting / receiving device ( 15 ) in the data communication system ( 9 ) is usable according to claim 16. Data transmission method, in particular for use in a data communication system according to one of claims 15 or 16, wherein a receiving / transmitting / receiving device ( 14 ) via a transmission channel, in particular a specific frequency band ( 16a ), modulated transmission signals ( 3 . 4 . 5 ) from a transmitting or a further transmitting / receiving device ( 15 ), characterized in that for estimation of the prevailing disturbance scenario, a value representing the disturbance power of the transmission channel (σ ² _{N, 0} ) is determined, and this value is associated with a plurality of comparison disturbance power values (σ, respectively) associated with a particular one of a plurality of comparison disturbance scenarios ² _{i, 0} ) is compared.