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Large-Scale Grant-Free Sparse Chaos Code Multiple Access Scheme for 5G IoT

Authors :
Naoto Horiike
Tetsuya Yamamoto
Eiji Okamoto
Source :
VTC-Fall
Publication Year :
2018
Publisher :
IEEE, 2018.

Abstract

In the fifth-generation mobile communications system (5G), wireless connections among numerous Internet of things (IoT) devices will be accommodated in the massive machine-type communications (mMTC) scenario. To realize such massive connectivity, non-orthogonal multiple access (NOMA) technologies have been proposed for 5G. As one of the NOMA schemes, we have proposed a grant-free sparse chaos code multiple access (GF-SCCMA) scheme exploiting the principle of chaos communications for mMTC. It realizes both physical layer security and large-capacity transmission. However, in conventional studies, a message-passing algorithm (MPA) was used in the receiver, which required relatively high calculation complexity, and the maximum number of users in GF-SCCMA was limited to approximately 10. Therefore, we propose an application of the Gaussian belief propagation (GaBP) algorithm for user signal detection to realize a large-scale transmission of more than 50 users with low calculation complexity. The improved transmission performances are shown through numerical simulations, by comparison with a conventional grant-free low-density signature scheme.

Details

Database :
OpenAIRE
Journal :
2018 IEEE 88th Vehicular Technology Conference (VTC-Fall)
Accession number :
edsair.doi...........de275cd3193ab41fc90f2e1bf87f41bc