PAPR and inter-cell interference reduction
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may apply one or more spreading sequences to a set of modulation symbols of a data set to generate spread modulation symbols; apply a scrambling sequence to the spread modulation symbols to generate a set of scrambled symbols; and transmit a waveform based at least in part on the set of scrambled symbols. Numerous other aspects are provided.
1. A method of wireless communication performed by a wireless communication device, comprising:
applying one or more spreading sequences to a set of modulation symbols of a data set to generate spread modulation symbols, wherein applying the one or more spreading sequences comprises performing spreading based at least in part on multiplying a codeword by a cell-specific mask sequence;
applying a scrambling sequence to the spread modulation symbols to generate a set of scrambled symbols, wherein a spreading sequence, of the one or more spreading sequences, is shorter in length than the scrambling sequence; and
transmitting a waveform based at least in part on the set of scrambled symbols.
2. The method of claim 1 , wherein the scrambling sequence is based at least in part on the one or more spreading sequences.
3. The method of claim 1 , wherein the one or more spreading sequences are applied using a hopping technique.
4. The method of claim 1 , wherein the one or more spreading sequences are linear spreading sequences.
5. The method of claim 1 , wherein the one or more spreading sequences are based at least in part on at least one of a Zadoff-Chu sequence, a Gold sequence, or an orthogonal cover code.
6. The method of claim 1 , wherein the waveform is a cyclic prefix orthogonal frequency division multiplexing waveform, and wherein the one or more spreading sequences are applied in a frequency domain.
7. The method of claim 1 , wherein the waveform is a discrete Fourier transform-spread-orthogonal frequency division multiplexing waveform and wherein the one or more spreading sequences are applied in a time domain.
8. The method of claim 1 , wherein the data set is associated with a data transmission.
9. The method of claim 1 , wherein the data set is associated with a control transmission.
10. The method of claim 1 , wherein the data set is associated with at least one of:
a demodulation reference signal,
a positioning reference signal, or
a sounding reference signal.
11. The method of claim 1 , wherein the waveform is associated with a multi-user multiple-input multiple-output communication.
12. The method of claim 1 , wherein at least one of the one or more spreading sequences or the scrambling sequence is configured to reduce a peak-to-average power ratio of the waveform.
13. The method of claim 1 , wherein at least one of the one or more spreading sequences or the scrambling sequence is configured to reduce a peak-to-average power ratio and inter-cell interference of the waveform.
14. The method of claim 1 , wherein at least one of the one or more spreading sequences or the scrambling sequence is configured to reduce inter-cell interference of the waveform.
15. The method of claim 14 , wherein the one or more spreading sequences are applied using a cell-specific hopping pattern.
16. The method of claim 14 , wherein the one or more spreading sequences are generated based at least in part on subset partitioning of a spreading codebook.
17. The method of claim 14 , wherein the scrambling sequence is applied using at least one of cell-specific scrambling or symbol-level scrambling.
18. The method of claim 1 , wherein the scrambling sequence is configured to reduce inter-cell interference of the waveform.
19. A wireless communication device for wireless communication, comprising:
a memory; and
one or more processors configured to:
apply one or more spreading sequences to a set of modulation symbols of a data set to generate spread modulation symbols, wherein, when applying the one or more spreading sequences, the one or more processors are configured to perform spreading based at least in part on multiplying a codeword by a cell-specific mask sequence;
apply a scrambling sequence to the spread modulation symbols to generate a set of scrambled symbols, wherein a spreading sequence, of the one or more spreading sequences, is shorter in length than the scrambling sequence; and
transmit a waveform based at least in part on the set of scrambled symbols.
20. The wireless communication device of claim 19 , wherein the scrambling sequence is based at least in part on the one or more spreading sequences.
21. The wireless communication device of claim 19 , wherein the one or more spreading sequences are applied using a hopping technique.
22. The wireless communication device of claim 19 , wherein the one or more spreading sequences are linear spreading sequences.
23. The wireless communication device of claim 19 , wherein the one or more spreading sequences are based at least in part on at least one of a Zadoff-Chu sequence, a Gold sequence, or an orthogonal cover code.
24. The wireless communication device of claim 19 , wherein the waveform is a cyclic prefix orthogonal frequency division multiplexing waveform, and wherein the one or more spreading sequences are applied in a frequency domain.
25. The wireless communication device of claim 19 , wherein the waveform is a discrete Fourier transform-spread-orthogonal frequency division multiplexing waveform and wherein the one or more spreading sequences are applied in a time domain.
26. The wireless communication device of claim 19 , wherein the data set is associated with a data transmission.
27. The wireless communication device of claim 19 , wherein the data set is associated with a control transmission.
28. The wireless communication device of claim 19 , wherein the data set is associated with at least one of:
a demodulation reference signal,
a positioning reference signal, or
a sounding reference signal.
29. The wireless communication device of claim 19 , wherein the waveform is associated with a multi-user multiple-input multiple-output communication.
30. The wireless communication device of claim 19 , wherein at least one of the one or more spreading sequences or the scrambling sequence is configured to reduce a peak-to-average power ratio of the waveform.
31. The wireless communication device of claim 19 , wherein at least one of the one or more spreading sequences or the scrambling sequence is configured to reduce a peak-to-average power ratio and inter-cell interference of the waveform.
32. The wireless communication device of claim 19 , wherein at least one of the one or more spreading sequences or the scrambling sequence is configured to reduce inter-cell interference of the waveform.
33. The wireless communication device of claim 32 , wherein the one or more spreading sequences are applied using a cell-specific hopping pattern.
34. The wireless communication device of claim 32 , wherein the one or more spreading sequences are generated based at least in part on subset partitioning of a spreading codebook.
35. The wireless communication device of claim 32 , wherein the scrambling sequence is applied using at least one of cell-specific scrambling or symbol-level scrambling.
36. The wireless communication device of claim 19 , wherein the scrambling sequence is configured to reduce inter-cell interference of the waveform.
37. A non-transitory computer-readable medium storing one or more instructions for wireless communication, the one or more instructions comprising:
one or more instructions that, when executed by one or more processors of a wireless communication device, cause the one or more processors to:
apply one or more spreading sequences to a set of modulation symbols of a data set to generate spread modulation symbols, wherein the one or more instructions, that cause the one or more processors to apply the one or more spreading sequences, cause the one or more processors to perform spreading based at least in part on multiplying a codeword by a cell-specific mask sequence;
apply a scrambling sequence to the spread modulation symbols to generate a set of scrambled symbols, wherein a spreading sequence, of the one or more spreading sequences, is shorter in length than the scrambling sequence; and
transmit a waveform based at least in part on the set of scrambled symbols.
38. An apparatus for wireless communication, comprising:
means for applying one or more spreading sequences to a set of modulation symbols of a data set to generate spread modulation symbols, wherein the means for applying the one or more spreading sequences comprises means for performing spreading based at least in part on multiplying a codeword by a cell-specific mask sequence;
means for applying a scrambling sequence to the spread modulation symbols to generate a set of scrambled symbols, wherein a spreading sequence, of the one or more spreading sequences, is shorter in length than the scrambling sequence; and
means for transmitting a waveform based at least in part on the set of scrambled symbols.
39. The apparatus of claim 38 , wherein the scrambling sequence is based at least in part on the one or more spreading sequences.
40. The apparatus of claim 38 , wherein the one or more spreading sequences are applied using a hopping technique.
41. The apparatus of claim 38 , wherein the one or more spreading sequences are linear spreading sequences.
42. The apparatus of claim 38 , wherein the one or more spreading sequences are based at least in part on at least one of a Zadoff-Chu sequence, a Gold sequence, or an orthogonal cover code.
43. The apparatus of claim 38 , wherein the waveform is a cyclic prefix orthogonal frequency division multiplexing waveform, and wherein the one or more spreading sequences are applied in a frequency domain.
44. The apparatus of claim 38 , wherein the waveform is a discrete Fourier transform-spread-orthogonal frequency division multiplexing waveform and wherein the one or more spreading sequences are applied in a time domain.
45. The apparatus of claim 38 , wherein the data set is associated with a data transmission.
46. The apparatus of claim 38 , wherein the data set is associated with a control transmission.
47. The apparatus of claim 38 , wherein the data set is associated with at least one of:
a demodulation reference signal,
a positioning reference signal, or
a sounding reference signal.
48. The apparatus of claim 38 , wherein the waveform is associated with a multi-user multiple-input multiple-output communication.
49. The apparatus of claim 38 , wherein at least one of the one or more spreading sequences or the scrambling sequence is configured to reduce a peak-to-average power ratio of the waveform.
50. The apparatus of claim 38 , wherein at least one of the one or more spreading sequences or the scrambling sequence is configured to reduce a peak-to-average power ratio and inter-cell interference of the waveform.
51. The apparatus of claim 38 , wherein at least one of the one or more spreading sequences or the scrambling sequence is configured to reduce inter-cell interference of the waveform.
52. The apparatus of claim 51 , wherein the one or more spreading sequences are applied using a cell-specific hopping pattern.
53. The apparatus of claim 51 , wherein the one or more spreading sequences are generated based at least in part on subset partitioning of a spreading codebook.
54. The apparatus of claim 51 , wherein the scrambling sequence is applied using at least one of cell-specific scrambling or symbol-level scrambling.
55. The apparatus of claim 38 , wherein the scrambling sequence is configured to reduce inter-cell interference of the waveform.