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An Efficient Code-Domain NOMA Transceiver for mm-Wave Hybrid Massive MIMO Architectures

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Document pages: 30 pages

Abstract: Massive MIMO and non-orthogonal multiple access (NOMA) are crucial methodsfor future wireless systems as they provide many advantages over conventionalsystems. Power-domain NOMA methods are investigated in massive MIMO systems,whereas there is little work on integration of code-domain NOMA and massiveMIMO which is the subject of this study. We propose a general frameworkemploying user-grouping based hybrid beamforming architecture for mm-wavemassive MIMO systems where NOMA is considered as an intra-group process. It isshown that classical receivers of sparse code multiple access (SCMA) andmulti-user shared access (MUSA) can be directly adapted. Additionally, a novelreceiver architecture which is an improvement over classical one is proposedfor uplink MUSA. This receiver makes MUSA preferable over SCMA for uplinktransmission with lower complexity. We provide a lower bound on achievableinformation rate (AIR) as a performance measure. We show that code-domain NOMAschemes outperform conventional methods with very limited number of radiofrequency (RF) chains where users are spatially close to each other.Furthermore, we provide an analysis in terms of bit-error rate and AIR underdifferent code length and overloading scenarios for uplink transmission whereflexible structure of MUSA is exploited.

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