Method and apparatus for modifying a characteristic of a complex-valued signal

1. A method for modifying a characteristic of a representation of a complex-valued signal, the signal comprising at least a representation of a first and a second complex-valued symbol, the method comprising:

deriving a relative phase angle between the representation of the first and the second complex-valued symbols;

combining a representation of a complex-valued enhancement pulse and the representation of the complex-valued signal to obtain a representation of a first and a second corrected complex-valued symbol, wherein the enhancement pulse is chosen such that the relative phase angle between the first and second corrected symbols is smaller than a predetermined threshold; and

wherein the combining comprises adding another enhancement pulse to a representation of a phase of the complex-valued signal; or

adding a further enhancement pulse to a representation of a magnitude of the complex-valued signal.

2. A method for modifying a characteristic of a representation of a complex-valued signal, the signal comprising at least a representation of a first and a second complex-valued symbol, the method comprising:

deriving a relative phase angle between the representation of the first and the second complex-valued symbols;

combining a representation of a complex-valued enhancement pulse and the representation of the complex-valued signal to obtain a representation of a first and a second corrected complex-valued symbol, wherein the enhancement pulse is chosen such that the relative phase angle between the first and second corrected symbols is smaller than a predetermined threshold; and

wherein the representation of the complex-valued enhancement pulse is chosen such that a magnitude of the enhancement pulse is greater for a first pair of first and second complex-valued symbols with a greater magnitude than for a second pair of first and second complex-valued symbols having a lower magnitude.

3. The method according to claim 2 , wherein the combining comprises adding a first enhancement pulse to a representation of a real part of the complex-valued signal; or adding a second enhancement pulse to a representation of an imaginary part of the complex-valued signal.

4. A method for modifying a characteristic of a representation of a complex-valued signal, the signal comprising at least a representation of a first and a second complex-valued symbol, the method comprising:

deriving a relative phase angle between the representation of the first and the second complex-valued symbols;

combining a representation of a complex-valued enhancement pulse and the representation of the complex-valued signal to obtain a representation of a first and a second corrected complex-valued symbol, wherein the enhancement pulse is chosen such that the relative phase angle between the first and second corrected symbols is smaller than a predetermined threshold; and

wherein the representation of the complex-valued signal comprises a sequence of representations of complex-valued symbols, comprising:

deriving a relative phase angle between each pair of neighboring complex-valued symbols within the sequence; and

combining a complex-valued enhancement pulse with the representation of the complex-valued signal for every pair of neighboring symbols having a relative phase angle exceeding the predetermined threshold; and

wherein the representation of the complex-valued enhancement pulse is chosen such that the length of the enhancement pulse depends on the number of symbols occurring between two consecutive pairs of neighboring symbols exceeding the threshold.

5. The method according to claim 4 , wherein the enhancement pulse is shorter for a smaller number of symbols occurring between the two consecutive pairs of symbols than for a higher number of symbols occurring between the two consecutive pairs of symbols.

6. An apparatus for modifying the characteristic of a representation of a complex-valued signal, the signal comprising at least a representation of a first and a second complex-valued symbol, the apparatus comprising:

an analyzer adapted to derive a relative phase angle between the representation of the first and the second complex-valued symbols;

a signal enhancer adapted to combine a representation of a complex-valued enhancement pulse and the representation of the complex-valued signal to obtain a representation of a first and a second corrected complex-valued symbol, wherein the enhancement pulse is chosen such that a relative phase angle between the first and second corrected symbols is smaller than a predetermined threshold; and

wherein the signal enhancer is adapted to add another enhancement pulse to a representation of a phase of the complex-valued signal; or

to add a further enhancement pulse to a representation of a magnitude of the complex-valued signal.

7. An apparatus for modifying the characteristic of a representation of a complex-valued signal, the signal comprising at least a representation of a first and a second complex-valued symbol, the apparatus comprising:

an analyzer adapted to derive a relative phase angle between the representation of the first and the second complex-valued symbols;

a signal enhancer adapted to combine a representation of a complex-valued enhancement pulse and the representation of the complex-valued signal to obtain a representation of a first and a second corrected complex-valued symbol, wherein the enhancement pulse is chosen such that a relative phase angle between the first and second corrected symbols is smaller than a predetermined threshold; and

wherein the signal enhancer is adapted to choose the enhancement pulse such that the magnitude of the enhancement pulse is greater for a first pair of first and second complex-valued symbols with a greater magnitude than for a second pair of first and second complex-valued symbols having a lower magnitude.

8. An apparatus for modifying the characteristic of a representation of a complex-valued signal, the signal comprising at least a representation of a first and a second complex-valued symbol, the apparatus comprising:

an analyzer adapted to derive a relative phase angle between the representation of the first and the second complex-valued symbols;

a signal enhancer adapted to combine a representation of a complex-valued enhancement pulse and the representation of the complex-valued signal to obtain a representation of a first and a second corrected complex-valued symbol, wherein the enhancement pulse is chosen such that a relative phase angle between the first and second corrected symbols is smaller than a predetermined threshold; and

wherein the signal enhancer is adapted to choose the enhancement pulse such that the length of the enhancement pulse depends on the number of symbols occurring between two consecutive pairs of neighboring symbols exceeding the threshold.

9. The apparatus according to claim 8 , wherein the signal enhancer is adapted to choose the enhancement pulse such that the enhancement pulse is shorter for a smaller number of symbols occurring between the two consecutive pairs of symbols than for a higher number of symbols occurring between the two consecutive pairs of symbols.