Communication node and method therein for transmission using a precoded multi-carrier modulation scheme in a wireless communication network

1. A method performed by a communication node for transmission using a precoded multi-carrier modulation scheme in a wireless communications network, the method comprising:

splitting a precoded multi-carrier symbol into at least a first symbol part and at least a second symbol part;

determining a first guard period in the precoded multi-carrier symbol located after the first symbol part of the precoded multi-carrier symbol and a second guard period in the precoded multi-carrier symbol located one of before or after the second symbol part of the precoded multi-carrier symbol;

modulating the at least first and second symbol parts such that the first symbol part of the precoded multi-carrier symbol is used for transmission of a reference signal and the second symbol part of the precoded multi-carrier symbol is used for transmission of data and/or control information; and

transmitting the reference signal and the data and/or control information in the modulated precoded multi-carrier symbol including the modulated first symbol part and the second symbol part.

2. A method performed by a communication node for transmission using a precoded multi-carrier modulation scheme in a wireless communications network, the method comprising:

splitting a precoded multi-carrier symbol into at least a first symbol part and at least a second symbol part;

adjusting a first length of the first symbol part of the precoded multi-carrier symbol and a second length of the second symbol part of the precoded multi-carrier symbol to allocate different amounts of energy to the first symbol part of the precoded multi-carrier symbol and to the second symbol part of the precoded multi-carrier symbol;

modulating the at least first and second symbol parts such that the first symbol part of the precoded multi-carrier symbol is used for transmission of a reference signal and the second symbol part of the precoded multi-carrier symbol is used for transmission of data and/or control information; and

transmitting the reference signal and the data and/or control information in the modulated precoded multi-carrier symbol including the modulated first symbol part and the second symbol part.

3. A method according to claim 1 , wherein determining the first and second guard periods in the precoded multi-carrier symbol comprises determining the first and second guard periods such that the total duration of the first and second guard periods and the at least first and second symbol parts of the precoded multi-carrier symbol is equal to the duration of a precoded multi-carrier symbol.

4. A method according to claim 3 ,

wherein the first guard period is located between the first symbol part and the second symbol part; and

wherein the second guard period in the precoded multi-carrier symbol is located after the second symbol part of the precoded multi-carrier symbol.

5. A method according to claim 3 ,

wherein the first guard period is located between the first symbol part and the second symbol part; and

wherein the second guard period in the precoded multi-carrier symbol is located before the second symbol part of the precoded multi-carrier symbol, wherein each of the first guard period and the second guard period is a cyclic prefix.

6. A method according to claim 1 , wherein each of the first guard period and the second guard period is a null-fix prefix.

7. A method according to claim 1 , further comprising:

applying windowing operation in the frequency domain on the precoded multi-carrier symbol.

8. A method according to claim 7 , wherein the window operation is performed using a Hamming or Hanning window.

9. A method according to claim 1 , wherein the precoded multi-carrier symbol is a discrete Fourier transform (DFT)-spread orthogonal frequency division multiplexed (OFDM) symbol.

10. A method according to claim 1 , wherein the communication node is a wireless device or a network node in the wireless communication network.

11. A communication node for transmission using a precoded multi-carrier modulation scheme in a wireless communications network, the communication node is configured to:

split a precoded multi-carrier symbol into at least a first symbol part and at least a second symbol part;

determine a first guard period in the precoded multi-carrier symbol located after the first symbol part of the precoded multi-carrier symbol and a second guard period in the precoded multi-carrier symbol located one of before or after the second symbol part of the precoded multi-carrier symbol;

modulate the at least first and second symbol parts such that the first symbol part of the precoded multi-carrier symbol is used for transmission of a reference signal and the second symbol part of the precoded multi-carrier symbol is used for transmission of data and/or control information; and

transmit the reference signal and the data and/or control information in the modulated precoded multi-carrier symbol including the modulated first symbol part and the second symbol part.

12. A communication node according to claim 11 , further configured to:

adjust a first length of the first symbol part of the precoded multi-carrier symbol and a second length of the second symbol part of the precoded multi-carrier symbol to allocate different amounts of energy to the first symbol part of the precoded multi-carrier symbol and to the second symbol part of the precoded multi-carrier symbol.

13. A communication node according to claim 11 , further configured to determine the first guard period and the second guard period by:

determining the first and second guard periods in the precoded multi-carrier symbol such that the total duration of the first and second guard periods and the at least first and second symbol parts of the precoded multi-carrier symbol is equal to the duration of a precoded multi-carrier symbol.

14. A communication node according to claim 13 ,

wherein the first guard period is located between the first symbol part and the second symbol part; and

wherein the second guard period in the precoded multi-carrier symbol is located after the second symbol part of the precoded multi-carrier symbol.

15. A communication node according to claim 13 ,

wherein the first guard period is located between the first symbol part and the second symbol part; and

wherein the second guard period in the precoded multi-carrier symbol is located before the second symbol part of the precoded multi-carrier symbol, wherein each of the first guard period and the second guard period is a cyclic prefix.

16. A communication node according to claim 13 , wherein each of the first guard period and the second guard period is a null-fix prefix.

17. A communication node according to claim 11 , further configured to:

apply a windowing operation in the frequency domain on the precoded multi-carrier symbol.

18. A communication node according to claim 17 , wherein the window operation is performed using a Hamming or Hanning window.

19. A communication node according to claim 11 , wherein the precoded multi-carrier symbol is a discrete Fourier transform (DFT)-spread orthogonal frequency division multiplexed (OFDM) symbol.

20. A computer program product embodied on a non-transitory computer readable medium, the computer program product comprising instructions which, when executed on at least one processor coupled to the non-transitory computer readable medium, cause the at least one processor to carry out the method according to claim 1 .

21. The method according to claim 1 , further comprising:

adjusting a first length of the first symbol part of the precoded multi-carrier symbol and a second length of the second symbol part of the precoded multi-carrier symbol to allocate different amounts of energy to the first symbol part of the precoded multi-carrier symbol and to the second symbol part of the precoded multi-carrier symbol.