Method for processing data in an optical network element and optical network element
A method for processing data in an optical network element is provided, wherein a multicarrier signal is linear pre-coded, and wherein the linear pre-coded signal is modulated. An according optical network element is also suggested.
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.