Method for processing data in an optical network element and optical network element

1. A method for processing data in an optical network element, the method comprising:

receiving a vector of symbols and processing a multicarrier signal;

linear pre-coding the multicarrier signal to form a linear pre-coded signal, wherein the amplitude of each subcarrier is a linear combination of said symbols,

wherein coefficients of this linear combination are taken from a matrix T, and

wherein a value of the signal at a kth sampling point is proportional to a kth element of the vector of symbols,

where k is an integer.

2. The method according to claim 1 , wherein a channel transfer function is pre-compensated by an equalization.

3. The method according to claim 2 , wherein said equalization is a one tap equalization.

4. The method according to claim 1 , wherein a subcarrier is received by a receiver and is discarded by the receiver when the subcarrier experiences deforming and/or attenuating effects above a given threshold.

5. The method according to claim 1 , wherein a dummy subcarrier is used to provide a guard band.

6. The method according claim 1 , wherein an inverse discrete Fourier transform is applied and wherein a zero padding is conducted prior to the inverse discrete Fourier transform.

7. The method according to claim 1 , wherein the signal is transmitted to a receiver and wherein a feedback channel is provided to convey information from the receiver to the optical network element.

8. The method according to claim 1 , wherein the optical network element is an optical transmitter.

9. An optical network element comprising

a linear pre-coder receiving a vector of symbols x and processing a multicarrier signal,

wherein the linear pre-coder pre-codes the multicarrier signal to form a linear pre-coded signal, wherein the amplitude of each subcarrier is a linear combination of said symbols, and wherein coefficients of this linear combination are taken from a matrix T, and

wherein a value of the signal at a kth sampling point is proportional to a kth element of the vector of symbols, where k is an integer.

10. The optical network element according to claim 9 further comprising a zero padding unit provided as part of the linear pre-coder for applying zero padding, an inverse discrete Fourier transform unit provided as part of the linear pre-coder for applying an inverse discrete Fourier transform and a modulator for modulating the linear pre-coded signal.

11. The optical network element comprising a control unit that is arranged such that the method according to claim 1 is executed.