DE10321803B4 - Method for transmitting data and data transmission system operating according to this method - Google Patents

Abstract

Method for the wireless transmission of data, wherein the data is transmitted as a bit sequence by means of electromagnetic signals (7, 12) between a first device (4) and a second device (5), wherein the two devices (4, 5) respectively a transmitter and / or a receiver for electromagnetic signals (7, 12), wherein the electromagnetic signals (7, 12) have a lying in a frequency band between two cutoff frequencies νa, νb frequency ν, wherein a first number n1 of channels with frequencies νk is selected from the frequency band, and wherein the frequencies νk are in the interval [νa, νb] between the cutoff frequencies νa, νb including the cutoff frequencies νa, νb, characterized in that a second number n2 of bits Bj from the bit string of the date is selected, and that both in the transmitter and in the receiver, a relational assignment R = (Bj, νk) between the selected bits Bj and the channels with de r frequency νk is set, so that each selected bit Bj is transmitted with a specific channel of the frequency νk.

Description

The invention relates to a method for the wireless transmission of data according to the preamble of patent claim 1, which is particularly useful in a locking system for a motor vehicle.

Increased safety requirements require electronic locking systems that use electromagnetic waves. For example, in motor vehicles such locking systems are used as door locking systems for access authorization and / or as ignition lock systems, steering wheel locks, immobilizers or the like for driving authorization.

Such locking systems are from the DE 43 40 260 A1 known. The locking system consists of a at least two states owning, designed as a control device for unlocking and / or locking the car doors, the ignition lock o. The like. First device and an associated, designed in the manner of an electronic key second device. For their intended operation, the two devices have a transmitter and / or a receiver for electromagnetic signals, wherein the electromagnetic signals have a frequency lying in a frequency band between two cutoff frequencies. In normal operation between the key and the control device at least one of a bit sequence existing date in the manner of a coded operating signal for the authentication of the key transferable, so that after positive evaluation of the transmitted operating signal and thus a legitimate key a change in the state of the control device is feasible.

Such a locking system is also from the DE 196 45 808 A1 known. To transmit the data, individual channels with different frequencies from the permissible frequency band are selected here as carriers, it being possible to switch between these channels.

The available frequency bands are evidenced by services such as Babyfon, wireless operator terminals, alarms o. The like., Occupied. This leads to the fact that there are always places where the locking system does not work or only unreliable. In addition, these locking systems do not always meet desirable security requirements.

The invention has for its object to provide a method for the wireless transmission of data with improved noise immunity, which is particularly useful in locking systems.

This object is achieved in the generic method for the wireless transmission of data by the characterizing features of claim 1.

In the method according to the invention, individual channels with different frequencies from the permissible frequency band as carrier as well as individual bits from the bit sequence of the data to be transmitted are selected. In both the transmitter and the receiver, a relational mapping is established between the selected bits and the selected channels such that each selected bit is transmitted with the respective selected channel. Successive bits or groups of bits are thus transmitted with different channels, i. H. the code to be transmitted is distributed in bits and / or blocks to different frequencies in the frequency band, which significantly reduces the likelihood of interference in the transmission. Further embodiments of the invention are the subject of the dependent claims.

Preferably, the date to be transmitted is coded with an error-correcting code, such as the Hamming code known per se, the Bode code or the like. In this case, up to a certain maximum number of channels depending on the respective code may be disturbed, without this impairing the transmission. Rather, then takes place an automatic correction of the transmitted date. In particular, disturbances of individual frequencies due to fading or sources of interference which lead, for example, to single-bit errors, can be corrected independently by the error-correcting code.

The technique is particularly simple to carry out when the frequency band is divided into the first number of channels such that the frequencies of the channels are equidistant from one another. Furthermore, the first number of channels may correspond to the second number of the selected bits. Conveniently, a power of two is selected for the first and the second number. It is useful when using conventional microprocessors, that the first and the second number is 32 each.

In order to transfer even large data without increased effort, the bit sequence of the date can be divided into sections of each of the second number of bits. The relational mapping is then applied to each of these sections.

To further increase the security against eavesdropping, the relational assignment can be changed in each case. It makes sense in this case, the respective relational assignment between successive Data or between successive sections of the bitstream for the date. The respective relational assignment can then be determined before the start of the transmission by the transmitter and communicated to the receiver coded if necessary at the beginning of the transmission. Appropriately, this message takes place in the synchronization between the transmitter and the receiver, so that thereby no extension of the transmission time occurs.

The respective relational assignment can also be coded in the manner of a table which is stored both in the transmitter and in the receiver. The sender and receiver then continuously select the respective valid relational assignment from this table. In addition, the table according to a predetermined scheme can also change constantly, making an unauthorized tapping is additionally difficult. The security against eavesdropping can also be further increased by determining the respective relational assignment in the manner of a random sequence, in particular a pseudorandom sequence. Alternatively, the respective relational assignment can also be determined based on a predetermined function.

Preferably, it is a frequency band in the MHz range, such as the ISM (Industrial Scientific Medical) band. The method according to the invention then avoids disturbances in the widely used frequencies 433 MHz or 868 MHz.

A suitable for carrying out the method data transmission system may consist of two devices, which are formed as follows. The one, acting as a transmitter device includes a multi-channel transmitter for transmitting electromagnetic signals, which is adjustable to at least a first number of channels, and a frequency encoder, which adjusts the respective channel in the transmitter according to the relational assignment. The other device operating as a receiver comprises a receiving module for receiving electromagnetic signals, a multi-channel synthesizer, by means of which the receiving module can be set to at least a first number of channels, and a frequency coder, which according to the relational assignment of the respective channel in the More Channel synthesizer.

In addition, the one transmitter device may include a bit encoder that selects the second number of bits from the bit sequence of the date. The bitcoder can be used to encode the date with an error correcting code if necessary. Finally, the bitcoder can divide the date into individual sections of each of the second number of bits.

Likewise in addition, the other device operating as a receiver can contain a module for the reference bit sequence, in which the relational assignment is stored and can be fed to the frequency coder. By means of a decoder, the second number of bits can be generated from the signals received by the receiving module and from this the bit sequence for the transmitted date. Finally, with the aid of an error correction unit, if necessary, corrections can be made to the generated bit sequence by means of the error-correcting code.

A locking system equipped with such a data transmission system, in particular for access and / or driving authorization in a motor vehicle, can be designed as follows. The locking system has a at least two conditions owning, designed as a control device first means, such as a control device for unlocking and / or locking the car doors, the ignition, the steering wheel lock, to enable and / or blocking the immobilizer, the engine control unit o. and an associated second device configured in the manner of an electronic key, an ID transmitter, a smart card or the like. The two devices have for their intended operation, a transmitter and / or a receiver for electromagnetic signals. At least one of the signals transmitted between the second device and the first device is an encoded operating signal for authenticating the second device, so that after a positive evaluation of the transmitted operating signal with an authorized second device, a change in the state of the first device can be effected.

The advantages achieved by the invention are in particular that a broad protection against interference of data transmission is given. Even a certain number of faults that have nevertheless occurred can be corrected automatically by using an error-correcting code. Data can thus be transmitted in a disturbed or bizarrely problematic environment and the user advantageously receives a higher availability of the radio channel. Furthermore, the interception and / or manipulation security of the data transmission is increased by the method according to the invention. It is also an easy-to-use and inexpensive to implement method for data transmission, which is particularly advantageously suitable for use in motor vehicle locking systems.

An embodiment of the invention is illustrated in the drawings and will be described in more detail below. Show it

1 a motor vehicle equipped with a function-independent locking system,

2 schematically the locking system with its operation-dependent functions,

3 a diagram of the wireless data transmission method for the locking system and

4 a schematic block diagram for the data transmission system.

The inventive method is particularly suitable for interference-free transmission of coded data in locking systems for motor vehicles and is explained in more detail below with reference to such a locking system.

In 1 is a motor vehicle 1 with the authorized user 2 to see. The car 1 is for access authorization with a locking system 3 provided as a door closing system, which is designed as a control unit first device 4 and an associated second device 5 includes. The second device 5 is in the form of an electronic key, a smart card, a smart card o. The like., Also referred to as ID (Identification) -Geber formed. The second device 5 is owned by the authorized user 2 , with which this within an effective range 8th independent access to the motor vehicle 1 has.

The first device 4 has at least two states, wherein in the first state, a lock and in the second state, an unlocking of the car doors 6 is present. The two facilities 4 . 5 have for their intended operation, a transmitter and / or a receiver for signals 7 , At least one of these between the second device 5 and the first device 4 transmitted signals 7 it is a coded, electromagnetic operating signal. The coded operating signal 7 serves to authenticate the second device 5 , which means authorized second device 5 after a positive evaluation of the transmitted operating signal 7 a change of the state of the first device 4 is feasible. The operating signal 7 may in particular consist of several sub-signals and in a bidirectional communication between the two devices 4 . 5 be transmitted. With regard to further details of the bidirectional communication itself is also on the DE 43 40 260 A1 directed.

The transmission of the coded operating signal 7 occurs when the authorized user 2 the door handle 10 at the car door 6 pressed or the door handle 10 approaches. This will unlock the car doors 6 triggered according to the KeylessEntry functionality. Just as well, the transmission of the coded operating signal 7 also automatically without the involvement of the user 2 take place as soon as this the effective range 8th which is not considered in the following. Closes the user 2 the car doors 6 from the outside, so there is an automatic locking the car doors 6 , Likewise, the automatic locking of the car doors 6 done after the user reaches the effective range 8th has left.

The locking system 3 continues to operate regardless of driving authorization for the motor vehicle 1 firmly. This is achieved by the first device 4 also according to the two states, the release and / or blocking of a functionally relevant component of the motor vehicle 1 For example, here can be a release and / or blocking an immobilizer, the engine control unit o. The like. The transmission of the coded operating signal 7 for authentication of the second device 5 occurs when the authorized user 2 in the interior 17 of the motor vehicle 1 located and one in 1 only schematically indicated start / stop switch 9 actuated. As a result, the starting process o. The like. Of the motor vehicle 1 triggered according to the KeylessGo functionality.

As based on the 2 can be seen, with the help of the ID transmitter 5 the locking system 3 to control the access authorization also remotely controllable. In the present case, the car doors can be 6 of the motor vehicle 1 remote controllable up to a certain maximum distance from the motor vehicle 1 lock and unlock, ie the central locking for the car doors 6 can be so by the user 2 actuate.

This is between the ID transmitter 5 and, for example, centrally in the motor vehicle 1 on the inside mirror 13 arranged transmitter / receiver 11 a coded remote control signal 12 transferable. As remote control signals 12 As a rule, electromagnetic signals, such as RF signals and / or infrared signals or the like, are used. The transmission of the remote control signal 12 is by means of the housing of the ID transmitter 5 located, designed as keys actuators 14 by the user 2 triggered. The transmitted remote control signal 12 then becomes the in the vehicle 1 located first device 4 supplied and after its positive evaluation, that is, if it is the legitimate second device 5 is, for example, in the respective car door 6 located control unit 16 that with the first device 4 via a bus system 15 in connection, for locking or unlocking the car doors 6 driven. At the in 2 shown ID transmitter 5 are a total of three buttons 14 available, one button each 14 to Unlocking and locking the car doors 6 and another button 14 for the opening of the trunk lid.

In 2 is further shown the essentially operation-dependent driving authorization. For this purpose, the ID transmitter 5 with its front part 18 in a corresponding recording 19 of the control unit 4 plugged in. Then, a contactless inductive energy transfer from a transponder coil in the control unit 4 on the ID transmitter 5 be turned on, so that for the intended operation of the ID transmitter 5 required energy from the control unit 4 is delivered. Subsequently, the control unit exchanges 4 with that in the recording 19 located ID transmitter 5 the coded operating signal 7 from, which may be, for example, infrared signals. After positive evaluation of the transmitted operating signal 7 the release for the immobilizer can be triggered. After release of the immobilizer is the commissioning of the motor vehicle 1 by means of known turning the ID transmitter 5 in the recording 19 , By pressing the appropriate place in the vehicle 1 located start / stop switch 9 o. The like. By the user 2 allows.

The authentication of the ID transmitter 5 serving data containing a code in the manner of a radio telegram are called a bit sequence by means of the electromagnetic signals 7 . 12 wirelessly transmitted, with the electromagnetic signals 7 . 12 have a frequency ν. The frequency ν is actually a frequency band that includes frequencies between two cutoff frequencies νa, νb. For example, at the frequency ν of 433 MHz, a frequency band of 433.92 MHz +/- 650 KHz is permissible, so that the cutoff frequencies of this frequency band are νa = 433.27 MHz and νb = 434.57 MHz, thus transmitting the signals 7 . 12 a frequency from the interval [νa, νb], hereinafter referred to as fundamental frequency νg, is selectable. Due to the speed of data transmission are in motor vehicle locking systems 3 especially frequency bands in the MHz range used. Particularly suitable is the ISM (Industrial Scientific Medical) band, which in addition to the already mentioned frequency ν of 433 MHz also includes the further permissible frequency ν of 868 MHz.

As based on the 3 1, a first number n1 of channels with frequencies νk is selected from the frequency band in order to improve the interference immunity for the transmission, the frequencies νk lying in the interval [νa, νb] between the cutoff frequencies νa, νb. If necessary, this selection can be made including the cut-off frequencies νa, νb. Furthermore, a second number n2 of bits Bj is selected from the bit sequence of the date. Both in the transmitter and in the receiver is now one with arrows in 3 designated relational assignment R = (Bj, νk) between the selected bits Bj and the channels having the frequency νk set such that each selected bit Bj is transmitted with a particular channel of frequency νk. Thus, at the first datum designated frame 1, the bit B1 having the frequency ν2, the bit B2 having the frequency ν4, the bit B4 having the frequency ν1 = νa, the bit B5 having the frequency νn1 = νb and so forth are transmitted. The last bit Bn2 of frame 1 is finally transmitted at frequency ν3. Thus, for frame 1, (B1, ν2), (B2, ν4), and so forth apply to (Bn2, ν3) as a relational assignment R. Of course, bit groups of several bits Bj can also be transmitted with a particular channel of frequency νk in 3 but not further considered.

The assignment of the channels with the frequencies νk to the individual bits Bj or bit groups for the transmission thus takes place in a kind of "jump method". This reduces the probability of transmitting on a disturbed channel, since in general only individual channels from the frequency band are disturbed. In addition, individual disturbed transmitted bits Bj can be compensated by appropriate redundancy in the data. In other words, the interference immunity of the transmission is increased in the inventive method. In a further embodiment, moreover, the date can be coded with an error-correcting code, such as the Hamming code, the Bode code or the like, with which an automatic correction of individual bits Bj which are transmitted erroneously is made possible. In addition, the interception of the code during the transmission by an unauthorized third party is made more difficult by the "jump method", which at the same time theft security for operating the inventive method locking system 3 is increased.

In the following, various refinements of the data transmission method according to the invention will be explained in more detail.

The frequencies νk of the channels can, as far as technically feasible, be selected arbitrarily from the frequency band. Of course, the same frequency νk can also be chosen several times. For the sake of technical simplicity, however, it is advisable to uniformly divide the frequency band into the first number n1 of channels. The frequencies νk of the channels then have a uniform distance Δν from each other, as well as from the 3 is apparent.

How to get by 3 Further, the bit B3 is not among the selected bits, so that the bit B3 is thus transmitted at the fundamental frequency νg of the frequency band. However, it is preferred if all bits Bj of a Date are selected. In this case, each of the n2 bits Bj is assigned to one of the n1 channels with the frequency νk, which is in 3 is shown by the date indicated by frame 2. In a minimum requirement, the first number n1 then corresponds to the channels with the frequency vk of the second number n2 of the selected bits Bj. Expediently, the first and second numbers n1, n2 may be a power of two. When using conventional microprocessors for carrying out the method according to the invention, it makes sense that the first and the second number n1, n2 is 32 in each case.

To increase the security against eavesdropping and to realize other functions of the locking system 3 usually longer codes are used. It then makes sense to divide the bit sequence of the date into sections of the second number of n2 bits in each case. For example, in 3 a division into two sections, which are designated by frame 1 and 2 frame. The relational assignment R = (Bj, νk) between the selected bits Bj and the channels with the frequency νk is then applied to each of these sections, ie first to frame 1 and then to frame 2. Unauthorized interception and / or recording of the radiotelegram can then be further complicated by the relational assignment R = (Bj, νk) is changed in each case. Thus, the relational assignment R = (Bj, νk) is changed for the successive portions of the bit sequence for the datum, as determined by frame 1 and frame 2 in FIG 3 is shown. For example, for frame 1 the relational assignment (B1, ν2) and for frame 2 the relational assignment (B1, νn1) is fixed.

For the sake of simplicity, it may also be sufficient if the respective relational assignment R = (Bj, νk) changes only between successive data. For example, this may be the case for a further subsequent actuation of the locking system 3 according to the 1 or 2 be the case.

The respective relational assignment R = (Bj, νk) can be coded in the manner of a table. This table is then stored both in the transmitter and in the receiver. The transmitter and the receiver then select the respective current relational assignment R = (Bj, νk) on each transmission. Of course, the respective relational assignment R can also be determined by means of a predetermined function. Finally, the respective relational assignment R can also be defined in the manner of a random sequence, in particular a pseudorandom sequence, which further increases the transmission reliability.

As far as the respective relational assignment R = (Bj, νk) are not simultaneously known to the sender and receiver or these can be determined by sender and receiver, this can be communicated to the other partner before or even at the beginning of the transmission. For example, the relational assignment R = (Bj, νk) may be established by the sender prior to transmission and then communicated to the receiver at the beginning of the transmission. Of course, this message can be coded. For reasons of time, it is advisable to make this notification in the synchronization between the transmitter and the receiver.

A block diagram of the embodiment of the method according to the invention operating data transmission system, as in the locking system 3 after the 1 or 2 is arranged closer is in 4 shown.

The second, acting as a transmitter for the data to be transmitted device 5 includes one with an antenna 21 connected multi-channel transmitter 20 for transmitting electromagnetic signals 7 . 12 , The multi-channel transmitter 20 is adjustable at least to the first number n1 of channels with the frequencies νk from the frequency band with the fundamental frequency νg. Next, the second device 5 a frequency encoder 23 on, which according to the relational assignment R = (Bj, νk) the respective channel with the frequency vk in the multi-channel transmitter 20 established. The first device operating as a receiver for the data to be transmitted 4 contains a receiving module 24 with an antenna 22 for receiving electromagnetic signals 7 . 12 , Next owns the first device 4 a multi-channel synthesizer 25 , by means of which the receiving module 24 at least to the first number n1 of channels with the frequencies νk is adjustable. Finally, located in the first facility 4 another frequency encoder 26 corresponding to the relational assignment R = (Bj, νk) the respective channel with the frequency νk in the multi-channel synthesizer 25 established. With the help of the multi-channel transmitter 20 Thus, the respective bit Bj of the bit sequence to be transmitted on the associated channel νk from the second device 5 sent and by means of the receiving module 24 in the first facility 4 receive.

In addition, the second, acting as a transmitter device 5 a bitcoder 27 contain. The bitcoder 27 selects the second number n2 of bits Bj from the bit sequence of the data to be transmitted. Further coded the bit encoder 27 the date with the desired code, which can be an error-correcting code as mentioned above. Finally, the bitcoder 27 the date into individual sections according to the in 3 Split frames 1, 2 of each of the second number n2 of bits. The bitcoder 27 then carries the data to be transmitted via the frequency encoder 23 the multi-channel transmitter 20 to.

Also in further equipment, the first, working as a receiver device 4 a module for the reference bit sequence 28 in which the respective relational assignment R = (Bj, νk) is stored. The respective reference bit sequence in the module 28 is the frequency encoder 26 for selection of the corresponding channel with the frequency νk fed. Next, the first device 4 a decoder 29 on, the second number n2 of bits Bj from that of the receiving module 24 received signals 7 . 12 generated. The decoder generates these bits Bj 29 then the bit sequence for the transmitted date. Finally, the first device may still have an error correcting unit (ECU) 30 have. If any of the transmitted bits Bj are corrupted, the error correction unit may 30 then make appropriate corrections by means of the error-correcting code to the generated bit sequence, so that then the error-free date in the first device 4 is available for further use.

Of course, by interchanging the modules described also the first device 4 as transmitter and the second device 5 be designed as a receiver for the data transmission according to the invention. If bidirectional data transmission according to the method of the invention is desired, the described modules are simultaneously in both devices 4 . 5 to arrange. The control of the individual components in the two facilities 4 . 5 as well as the further processing and evaluation of the transmitted data in the locking system 3 is done by not further shown microprocessors.

The invention is not limited to the described and illustrated embodiment. Rather, it also encompasses all expert developments within the scope of the invention defined by the claims. Thus, the inventive method for transmitting data not only in the described motor vehicle locking system 3 can be used, but can also in other data transmission systems that are to work tap-proof and / or error-tolerant, for example, in telecommunications, mobile phone o. The like., Use.

LIST OF REFERENCE NUMBERS

1

motor vehicle

2

user

3

(Automotive) locking system

4

(first) device / controller

5

(second) device / ID transmitter

6

car door

7

Signal / operation signal

8th

effective range

9

Start / stop switch

10

door handle

11

Transmitter-receiver

12

Signal / remote control signal

13

Rear View mirror

14

Actuator / button (on second device)

15

bus system

16

Control unit (in the car door)

17

Interior (of motor vehicle)

18

Front part (from ID transmitter)

19

Recording (in the control unit)

20

Multi-channel transmitter / transmitter

21, 22

antenna

23

Frequency encoder (in the transmitter)

24

Receiver module / receiver

25

Multi-channel synthesizer

26

Frequency encoder (in the receiver)

27

Bitcoder

28

Module for reference bit sequence

29

decoder

30

Error correction unit

Claims (25)

Method for the wireless transmission of data, the data being a bit sequence using electromagnetic signals ( 7 . 12 ) between a first device ( 4 ) and a second device ( 5 ), the two institutions ( 4 . 5 ) each have a transmitter and / or a receiver for electromagnetic signals ( 7 . 12 ), the electromagnetic signals ( 7 . 12 ) have a frequency ν lying in a frequency band between two cut-off frequencies νa, νb, wherein a first number n1 of channels with frequencies νk is selected from the frequency band, and wherein the frequencies νk in the interval [νa, νb] between the cut-off frequencies νa, νb including the cut-off frequencies νa, νb, characterized in that a second number n2 of bits Bj is selected from the bit sequence of the date, and that in both the transmitter and the receiver a relational assignment R = (Bj, νk) between the selected ones Bits Bj and the channels at the frequency νk, so that each selected bit Bj is transmitted at a particular channel of frequency νk. Method for the wireless transmission of data according to Claim 1, characterized in that the data is coded with an error-correcting code. Method for the wireless transmission of data according to Claim 2, characterized in that the error-correcting code is the Hamming code or the Bode code. Method for the wireless transmission of data according to Claim 1, 2 or 3, characterized in that the frequency band is in the first number N1 of channels is divided so that the frequencies νk of the channels have a uniform distance Δν from each other. A method of wireless transmission of data according to any one of claims 1 to 4, characterized in that the bit sequence of the date is divided into sections of each of the second number n2 bits Bj such that the relational assignment is applied to each of these sections. Method for the wireless transmission of data according to one of Claims 1 to 5, characterized in that the first number n1 of the channels with the frequencies νk corresponds to the second number n2 of the selected bits Bj. Method for the wireless transmission of data according to one of Claims 1 to 6, characterized in that the first and second numbers n1, n2 are a power of two. Method for the wireless transmission of data according to one of Claims 1 to 7, characterized in that the relational assignment R is changed in each case. Method for the wireless transmission of data according to one of Claims 1 to 8, characterized in that the respective relational assignment R between successive data or between successive sections of the bit sequence for the date is changed. Method for the wireless transmission of data according to one of Claims 1 to 9, characterized in that the respective relational assignment R is defined by the sender before the beginning of the transmission. Method for the wireless transmission of data according to one of claims 1 to 10, characterized in that the relational assignment R is communicated to the receiver in the synchronization between the transmitter and the receiver at the beginning of the transmission. Method for the wireless transmission of data according to one of Claims 1 to 11, characterized in that the respective relational assignment R is coded in the manner of a table, the table being stored both in the transmitter and in the receiver. Method for the wireless transmission of data according to one of Claims 1 to 12, characterized in that the respective relational assignment R is defined in the manner of a random sequence. Method for the wireless transmission of data according to one of Claims 1 to 13, characterized in that the respective relational assignment R is determined on the basis of a predetermined function. Method for the wireless transmission of data according to one of Claims 1 to 14, characterized in that it is a frequency band in the MHz range. Method for the wireless transmission of data according to Claim 15, characterized in that the frequency ν of the frequency band is 433 MHz or 868 MHz. Method for the wireless transmission of data according to one of Claims 1 to 16, characterized in that the data is a code in the manner of a radio telegram for a motor vehicle locking system ( 3 ). Data transmission system for carrying out the method according to one of Claims 1 to 17, characterized in that the one transmitter device operates a multi-channel transmitter ( 20 ) for transmitting electromagnetic signals ( 7 . 12 ), which is adjustable at least to a first number n1 of channels with frequencies νk, and a frequency encoder ( 23 ), which according to the relational assignment R = (Bj, νk) the respective channel with the frequency vk in the multi-channel transmitter ( 20 ) contains. Data transmission system according to Claim 18, characterized in that the other device operating as a receiver is a receiving module ( 24 ) for receiving electromagnetic signals ( 7 . 12 ), a multi-channel synthesizer ( 25 ), by means of which the receiving module ( 24 ) is adjustable at least to a first number n1 of channels with frequencies νk, and a frequency encoder ( 26 ), which according to the relational assignment R = (Bj, νk) the respective channel with the frequency vk in the multi-channel synthesizer ( 25 ) contains. Data transmission system according to Claim 18 or 19, characterized in that the one transmitter device operates a bit coder ( 27 ) which selects the second number n2 of bits Bj from the bit sequence of the date. Data transmission system according to claim 18, 19 or 20, characterized in that the bit coder ( 27 ) divides the data into individual sections of each of the second number n2 of bits Bj. Data transmission system according to one of Claims 18 to 21, characterized in that the bit coder ( 27 ) codes the date. Data transmission system according to one of Claims 18 to 22, characterized in that the other device acting as receiver has a module for the reference bit sequence ( 28 ), in which the relational assignment R = (Bj, νk) and the frequency coder ( 26 ) can be supplied. Data transmission system according to one of Claims 18 to 23, characterized in that the other device acting as receiver has a decoder ( 29 ), the second number n2 of bits Bj from the receiving module ( 24 ) received signals ( 7 . 12 ) and from which the bit sequence for the transmitted date generated contains. Data transmission system according to one of Claims 18 to 24, characterized in that the other device operating as a receiver comprises an error correction unit ( 30 ), which makes corrections by means of the error-correcting code on the generated bit sequence.

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