Quantum search aided multi-user detection for sparse code multiple access

Abstract

With the explosive proliferation of mobile devices, the scarcity of communication resources has emerged as a critical issue in the Next Generation (NG) communication systems. To overcome this, Non-Orthogonal Multiple Access (NOMA) has been shown to provide a beneficial spectral efficiency gain, while supporting massive connectivity. Sparse Code Multiple Access (SCMA) is one of the NOMA schemes, but its application is hampered by its high-complexity multi-user detection. Fortunately, quantum search techniques were shown to substantially reduce the complexity of multi-user detectors (MUD). However, the quantum search aided multiuser detection of SCMA is an open problem at the time of writing. Hence we conceive a pair of quantum search aided MUDs for SCMA, namely, a Quantum-assisted Message Passing Algorithm (Q-MPA) based MUD and a Quantum-assisted Sphere Decoder based MPA (QSD-MPA) MUD.

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Identifiers

ORCID for Lajos Hanzo: orcid.org/0000-0002-2636-5214

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