Evaluation unit and a method for demodulation of OFDM data

1. An evaluation unit, comprising:

a central data-processing unit;

at least one storage unit; and

an allocation unit, wherein the allocation unit and the at least one storage unit are connected to the central data-processing unit,

wherein the central data-processing unit loads at least one OFDM signal from the at least one storage unit and transfers it to the allocation unit, and

wherein the allocation unit displays the individual signal spaces of OFDM symbols of the at least one OFDM signal in a constellation diagram and in a frame-output matrix in such a manner that it is possible to allocate via the constellation diagram and frame-output matrix, at which signal spaces data symbols and/or pilot symbols and/or zero symbols and/or don't care symbols are present and with which modulation type the data symbols and/or pilot symbols are modulated.

2. The evaluation unit according to claim 1 , wherein the allocation unit draws a number of constellation circles in the constellation diagram corresponding to an allocated modulation type.

3. The evaluation unit according to claim 2 , wherein radii of the constellation circles can be adjusted in such a manner that individual constellation circles do not overlap and/or that centre points of the constellation circles can be multiplied by a first boosting factor and/or that an imaginary part and a real part of the individual signal spaces can be multiplied by a second boosting factor such that a maximum possible number of signal spaces are arranged within the constellation circles.

4. The evaluation unit according to claim 3 , wherein the first boosting factor and/or the second boosting factor can be varied within the allocation unit until a maximum possible number of signal spaces are disposed approximately at the centre point of the constellation circles.

5. The evaluation unit according to claim 2 , wherein all of the signal spaces which are disposed or marked within the constellation circles can be allocated by the allocation unit to data symbols and/or pilot symbols and/or zero symbols and/or don't care symbols, and that the signal spaces are highlighted in the frame-output matrix.

6. The evaluation unit according to claim 1 , wherein the signal spaces which can be allocated to data symbols and/or pilot symbols and/or zero symbols and/or don't care symbols can be selected via the frame-output matrix, and that the selected signal spaces are highlighted in the constellation diagram.

7. The evaluation unit according to claim 1 , wherein the allocation unit synchronises the at least one OFDM signal, in that various settings for timing, frequency and phase are adjusted in succession by the allocation unit.

8. The evaluation unit according to claim 7 , wherein a step-width between two adjacent settings is selected by the allocation unit in such a manner that a resulting phase jump is smaller than a minimal phase jump between two signal spaces of a maximum-value constellation, and

wherein the allocation unit analyses, with regard to the at least one OFDM signal, for which settings of the timing, frequency and phase a scattering of the individual signal spaces in the constellation diagram is minimal.

9. The evaluation unit according to claim 1 , wherein the allocation unit prepares an assignment matrix, which, for the individual signal spaces, contains information regarding whether these are allocated to data symbols or pilot symbols or zero symbols or don't care symbols.

10. The evaluation unit according to claim 9 , wherein the allocation unit stores the assignment matrix in the at least one storage unit.

11. The evaluation unit according to claim 1 , wherein the allocation unit loads an assignment matrix, which, for the individual signal spaces, contains information regarding whether these are allocated to data symbols or pilot symbols or zero symbols or don't care symbols.

12. The evaluation unit according to claim 10 , wherein the allocation unit stores the assignment matrix as an XML file.

13. A method for operating an evaluation unit having a central data-processing unit, at least one storage unit and an allocation unit, wherein the allocation unit and the at least one storage unit are connected to the central data-processing unit, comprising:

loading of at least one OFDM signal from the at least one storage unit by the central data-processing unit and transfer of the at least one OFDM signal to the allocation unit;

displaying individual signal spaces of OFDM symbols of the at least one OFDM signal in a constellation diagram and in a frame-output matrix;

allocating the individual signal spaces to data symbols and/or pilot symbols and/or zero symbols and/or don't care symbols; and

allocating a modulation type to the data symbols and/or pilot symbols.

14. The method according to claim 13 , further comprising:

drawing a number of constellation circles in the constellation diagram corresponding to a selected modulation type;

adjusting radii of the constellation circles in such a manner that the individual constellation circles do not overlap and/or multiplication of centre points of the constellation circles by a first boosting factor and/or multiplication of an imaginary part and a real part of the individual signal spaces by a second boosting factor in such a manner that a maximum possible number of signal spaces are arranged within the constellation circles; and

varying the first boosting factor and/or the second boosting factor until the maximum possible number of signal spaces are disposed approximately at the centre of the constellation circle.

15. The method according to claim 14 , further comprising:

allocating all signal spaces which are disposed within the constellation circles or marked, to data symbols or pilot symbols or zero symbols or don't care symbols, and highlighting the signal spaces in the frame-output matrix; and

selecting the signal spaces in the frame-output matrix which are allocated to data symbols or pilot symbols or zero symbols or don't care symbols, and highlighting of the selected signal spaces in the constellation diagram.

16. The method according to claim 13 , further comprising:

synchronizing the at least one OFDM signal, in that various settings of timing, frequency and phase are adjusted by the allocation unit in succession;

selecting the allocation unit of a step-width between two adjacent settings in such a manner that a resulting phase jump is smaller than a minimal phase jump between two signal spaces of a maximal-value constellation; and

analyzing which setting for the timing, frequency and phase leads to a minimal scattering of the individual signal spaces in the constellation diagram.

17. The method according to claim 13 , further comprising:

plotting the allocation unit of an assignment matrix which, for the individual signal spaces, contains information regarding whether this is allocated to the data symbols or pilot symbols or zero symbols or don't care symbols;

storing the allocation unit of the assignment matrix in the at least one storage unit;

loading the allocation unit of an assignment matrix which, for the individual signal spaces, contains information regarding whether this is allocated to data symbols or pilot symbols or zero symbols or don't care symbols.

18. A non-transitory computer-readable medium that stores instructions for causing a processor to execute the method according to claim 13 .