QUALCOMM Incorporated
Multiple access signatures for non-orthogonal multiple access (NOMA) wireless communications

Abstract:

Methods, systems, and devices for wireless communications are described in which multiple access (MA) signatures may be used in non-orthogonal multiple access (NOMA) transmissions to provide differentiation between multiple concurrent NOMA transmission that use common time, frequency, and spatial resources. Systematic extension of the pool size of MA signatures can be obtained by the grouping of UE-specific spreading codes and the application of group-specific scrambling code, where the generation of scrambling code can depend at least on a cell ID and UE group ID. The MA signature may be based at least in part on a UE specific spreading code and a group level scrambling code. The UE-specific spreading code may be one of a set of codes associated with a particular scrambling code. The scrambling code may be one of a number of orthogonal or non-orthogonal scrambling codes that are associated with one or more UE parameters.