Method for compensating for peak values during a data transmission with discrete multitone symbols and a circuit arrangement for carrying out the method

1. Method for transmitting an analog data stream from a data stream transmitter to a data stream receiver by means of discrete multitone symbols, in which:

a) inputting data to be transmitted into a data input device of the data stream transmitter;

b) coding the data to be transmitted in a coding device and combining the data to be transmitted into coded data blocks;

c) transforming the coded data blocks into a multitone signal in an inverse transformation device;

d) converting the multitone signal into an analog transmitter signal in a digital-to-analog converter; and

e) transmitting the analog transmitter signal via a transmission channel, wherein transient processes are provided by means of redundant compensation signals in the data stream transmitter, so that the crest factor of modulated signals of the analog data stream is reduced, and wherein transient processes are predetermined in the data stream transmitter by stores of at least one filtering device provided in the data stream transmitter being preloaded with predeterminable storage values, wherein storage contents of the at least one filtering device provided in the data stream transmitter decay in accordance with recursive components of the filtering device such that the redundant compensation signals are generated.

2. Method according to claim 1 , wherein a preloading of stores of the at least one filtering device provided in the data stream transmitter with predeterminable storage values is carried out in each case after a transmission of a discrete multitone symbol.

3. Method according to claim 2 , wherein a preloading of stores of the at least one filtering device provided in the data stream transmitter with predeterminable storage values is carried out in a manner dependent on a frame synchronization signal of the analog transmitter signal.

4. Method according to claims 1 , wherein the predeterminable storage values are determined by an optimization by means of a linear programming.

5. Method according to claims 1 , wherein the predeterminable storage values are determined by an optimization by means of an adaptation using least mean squares.

6. Method according to claim 1 , wherein the predeterminable storage values which are fed to the at least one filtering device are determined in a storage value determining device in a manner dependent on the frame synchronization signal and on filter start values.

7. Method according to claims 1 , wherein the stores of the first and/or second filtering devices designed as a high-pass filter and/or as a low-pass filter are reset, while the stores of the third filtering device designed as an all-pass filter are preloaded with predeterminable storage values.

8. An apparatus for generating an analog transmitter signal in order to transmit an analog data stream from a data stream transmitter to a data stream receiver by means of discrete multitone symbols, having:

a) a data input device provided in the data stream transmitter and serving for inputting data to be transmitted;

b) a coding device for coding the data to be transmitted into coded data blocks;

c) an inverse transformation device for transforming the coded data blocks into a multitone signal; and

d) a digital-to-analog converter for converting the multitone signal into the analog transmitter signal, wherein the data stream transmitter has at least one filtering device, which provides transient processes by means of redundant compensation signals in order to reduce the crest factor of modulated signals of the analog data stream, wherein the at least one filtering device has recursive components which determine a decaying of storage contents of the at least one filtering device, wherein the storage contents of the at least one filtering device provided in the data stream transmitter decay such that the redundant compensation signals are generated.

9. Apparatus according to claim 8 , wherein the at least one filtering device is designed as an all-pass filter.

10. Apparatus according to claim 8 , wherein a storage value determining device is provided, which generates predeterminable storage values which are fed to the at least one filtering device.