Time domain in continuous DFT-S-OFDM for sidelobes reduction
Goal of the application is providing an alternative to the N-continuous algorithm in frequency domain for sidelobes reduction (OOB) suitable for SC-FDMA. A part of the time domain symbols is used as correction signal to ensure continuity of the signal and its derivatives at symbol boundaries, ie between previous symbol and guard interval (can be Zero Padding or Cyclic Pre-fix) of current symbol. Said time domain symbols are then FFT precoded, windowed, followed by IFFT and Guard Interval insertion. Also applied to FBMC.
1. A device for generating a transmission block for a precoded multi-carrier radio transmission, the device comprising:
processing circuitry; and
memory containing instructions executable by the processing circuitry, whereby the device is operative to:
provide a symbol that includes a plurality of symbol elements, wherein a subset of the plurality of symbol elements is set to values depending on a boundary condition for the transmission block;
precode the symbol; and
generate the transmission block by multi-carrier modulation of the precoded symbol,
wherein the boundary condition relates to a boundary value of the transmission block at a boundary in a time domain that ensures continuity across transmission block boundaries in the time domain,
wherein the continuity across transmission block boundaries in the time domain is ensured by inserting a guard interval including a zero symbol element adjacent to the transmission block, and wherein the boundary condition further relates to a boundary between the transmission block and the guard interval.
2. The device of claim 1 , wherein the multi-carrier modulation includes an Orthogonal Frequency-Division Multiplexing (OFDM) modulation or a Filter Bank Multi-Carrier (FBMC) modulation.
3. The device of claim 1 , wherein the precoding the symbol includes a Discrete Fourier Transform (DFT) or a Filter Bank Transform (FBT).
4. The device of claim 1 , wherein:
the precoding the symbol comprises a spectral analysis; and
the multi-carrier modulation comprises a spectral synthesis.
5. The device of claim 1 , wherein the subset of the plurality of symbol elements includes symbol elements adjacent to a boundary of the symbol.
6. The device of claim 1 :
wherein a cyclic prefix is inserted between a previous transmission block and the generated transmission block; and
wherein the boundary condition further relates to a boundary between the previous transmission block and the cyclic prefix.
7. The device of claim 1 , wherein symbol elements in the subset of the plurality of symbol elements are not contiguous in the symbol to be precoded.
8. The device of claim 1 , wherein data to be transmitted is encoded in symbol elements outside of the subset of the plurality of symbol elements.
9. A method of generating a transmission block for a precoded multi-carrier radio transmission, the method comprising:
providing a symbol including a plurality of symbol elements, wherein a subset of the plurality of symbol elements is set to values depending on a boundary condition for the transmission block;
precoding the symbol; and
generating the transmission block by multi-carrier modulation of the precoded symbol,
wherein the boundary condition relates to a boundary value of the transmission block at a boundary in a time domain that ensures continuity across transmission block boundaries in the time domain,
wherein the continuity across transmission block boundaries in the time domain is ensured by inserting a guard interval including a zero symbol element adjacent to the transmission block, and wherein the boundary condition further relates to a boundary between the transmission block and the guard interval.
10. The method of claim 9 , wherein performing the multi-carrier modulation includes performing an Orthogonal Frequency-Division Multiplexing (OFDM) modulation or a Filter Bank Multi-Carrier (FBMC) modulation.
11. The method of claim 9 , wherein performing the precoding includes performing a Discrete Fourier Transform (DFT) or a Filter Bank Transform (FBT).
12. The method of claim 9 :
wherein the precoding the symbol comprises performing a spectral analysis; and
wherein performing the multi-carrier modulation comprises performing a spectral synthesis.
13. The method of claim 9 , wherein the subset of the plurality of symbol elements includes symbol elements adjacent to a boundary of the symbol.
14. The method of claim 9 :
wherein a cyclic prefix is inserted between a previous transmission block and the generated transmission block; and
wherein the boundary condition further relates to a boundary between the previous transmission block and the cyclic prefix.
15. The method of claim 9 , wherein symbol elements in the subset of the plurality of symbol elements are not contiguous in the symbol to be precoded.
16. The method of claim 9 , wherein data to be transmitted is encoded in symbol elements outside of the subset of the plurality of symbol elements.
17. The method of claim 16 , wherein the data is encoded by a channel code providing forward error correction.
18. A non-transitory computer readable recording medium storing a set of computer-executable instructions for generating a transmission block for a precoded multi-carrier radio transmission, the set of computer-executable instructions causing processing circuitry of one or more computing devices to:
provide a symbol including a plurality of symbol elements, wherein a subset of the plurality of symbol elements is set to values depending on a boundary condition for the transmission block;
precode the symbol; and
generate the transmission block by multi-carrier modulation of the precoded symbol,
wherein the boundary condition relates to a boundary value of the transmission block at a boundary in a time domain that ensures continuity across transmission block boundaries in the time domain,
wherein the continuity across transmission block boundaries in the time domain is ensured by inserting a guard interval including a zero symbol element adjacent to the transmission block, and wherein the boundary condition further relates to a boundary between the transmission block and the guard interval.