Symbol processing using processing sequences
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may determine, when using resource spread multiple access with non-orthogonal multiple access, that a particular modulation scheme is enabled. The user equipment may process symbols using a set of processing sequences selected based at least in part on the particular modulation scheme such that the particular modulation scheme is preserved for the symbols. The user equipment may transmit the symbols based at least in part on processing the symbols using the set of processing sequences. Numerous other aspects are provided.
1. A method of wireless communication performed by a user equipment (UE), comprising:
determining, when using resource spread multiple access with non-orthogonal multiple access, that a particular modulation scheme is enabled,
wherein the particular modulation scheme is π/2 binary phase shift keying or π/4 quadrature phase shift keying;
processing symbols using a set of processing sequences selected based at least in part on the particular modulation scheme such that the particular modulation scheme is preserved for the symbols,
wherein the set of processing sequences includes a first subset, of a short code book or a set of long sequences, selected based at least in part on the particular modulation scheme, and
wherein the short code book or the set of long sequences includes a second subset that does not preserve the particular modulation scheme; and
transmitting the symbols based at least in part on processing the symbols using the set of processing sequences.
2. The method of claim 1 , wherein the UE is configured to perform short code spreading when processing the symbols using a processing sequence of the set of processing sequences.
3. The method of claim 1 , wherein the UE is configured to perform long sequence scrambling when processing the symbols using a processing sequence of the set of processing sequences.
4. The method of claim 1 , wherein the set of processing sequences includes the short code book.
5. The method of claim 1 , wherein the set of processing sequences includes the set of long sequences.
6. The method of claim 1 , wherein the first subset and the second subset are subsets of the short code book.
7. The method of claim 1 , wherein the first subset and the second subset are subsets of the set of long sequences.
8. The method of claim 1 , wherein the UE is configured to apply a phase rotation or a phase correction based at least in part on the particular modulation scheme such that the particular modulation scheme is preserved.
9. The method of claim 1 , wherein the UE is configured to determine that the particular modulation scheme is enabled based at least in part on received signaling or a downlink measurement.
10. A method of wireless communication performed by a base station (BS), comprising:
receiving, when using resource spread multiple access with non-orthogonal multiple access, symbols processed using a set of processing sequences selected based at least in part on a particular modulation scheme such that the particular modulation scheme is preserved for the symbols,
wherein the particular modulation scheme is π/2 binary phase shift keying or π/4 quadrature phase shift keying,
wherein the set of processing sequences includes a first subset, of a short code book or a set of long sequences, associated with the particular modulation scheme, and
wherein the short code book or the set of long sequences includes a second subset that does not preserve the particular modulation scheme;
processing the symbols using based on the particular modulation scheme being preserved for the symbols.
11. The method of claim 10 , wherein the symbols are processed using short code spreading.
12. The method of claim 10 , wherein the symbols are processed using long sequence scrambling.
13. The method of claim 10 , wherein the set of processing sequences includes the short code book.
14. The method of claim 10 , wherein the set of processing sequences includes the set of long sequences.
15. The method of claim 10 , wherein the first subset and the second subset are subsets of the short code book.
16. A user equipment (UE) for wireless communication, comprising:
a memory; and
one or more processors operatively coupled to the memory, the memory and the one or more processors configured to:
determine, when using resource spread multiple access with non-orthogonal multiple access, that a particular modulation scheme is enabled,
wherein the particular modulation scheme is π/2 binary phase shift keying or π/4 quadrature phase shift keying;
process symbols using a set of processing sequences selected based at least in part on the particular modulation scheme such that the particular modulation scheme is preserved for the symbols,
wherein the set of processing sequences includes a first subset, of a short code book or a set of long sequences, selected based at least in part on the particular modulation scheme, and
wherein the short code book or the set of long sequences includes a second subset that does not preserve the particular modulation scheme; and
transmit the symbols based at least in part on processing the symbols using the set of processing sequences.
17. The UE of claim 16 , wherein the UE is configured to perform short code spreading when processing the symbols using a processing sequence of the set of processing sequences.
18. The UE of claim 16 , wherein the UE is configured to perform long sequence scrambling when processing the symbols using a processing sequence of the set of processing sequences.
19. The UE of claim 16 , wherein the set of processing sequences includes the short code book.
20. The UE of claim 16 , wherein the set of processing sequences includes the set of long sequences.
21. The UE of claim 16 , wherein the first subset and the second subset are subsets of the short code book.
22. The UE of claim 16 , wherein the first subset and the second subset are subsets of the set of long sequences.
23. The UE of claim 16 , wherein the UE is configured to apply a phase rotation or a phase correction based at least in part on the particular modulation scheme such that the particular modulation scheme is preserved.
24. The UE of claim 16 , wherein the UE is configured to determine that the particular modulation scheme is enabled based at least in part on received signaling or a downlink measurement.
25. A base station (BS) for wireless communication, comprising:
a memory; and
one or more processors operatively coupled to the memory, the memory and the one or more processors configured to:
receive, when using resource spread multiple access with non-orthogonal multiple access, symbols processed using a set of processing sequences selected based at least in part on a particular modulation scheme such that the particular modulation scheme is preserved for the symbols,
wherein the particular modulation scheme is π/2 binary phase shift keying or π/4 quadrature phase shift keying,
wherein the set of processing sequences includes a first subset, of a short code book or a set of long sequences, associated with the particular modulation scheme, and
wherein the short code book or the set of long sequences includes a second subset that does not preserve the particular modulation scheme;
process the symbols using based on the particular modulation scheme being preserved for the symbols.
26. The BS of claim 25 , wherein the symbols are processed using short code spreading.
27. The BS of claim 25 , wherein the symbols are processed using long sequence scrambling.
28. The BS of claim 25 , wherein the set of processing sequences includes the short code book.
29. The BS of claim 25 , wherein the set of processing sequences includes the set of long sequences.
30. The BS of claim 25 , wherein the first subset and the second subset are subsets of the short code book.