NOMA-Aided Cell-Free Massive MIMO Systems

NOMA-Aided Cell-Free Massive MIMO Systems

A cell-free massive multiple-input multiple-output system with non-orthogonal multiple-access (NOMA) is investigated. An achievable sum rate is derived and compared against the orthogonal multiple access (OMA) counterpart. Thereby, the detrimental effects of intra-cluster pilot contamination, inter-...

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Veröffentlicht in:IEEE wireless communications letters 2018-12, Vol.7 (6), p.950-953
Hauptverfasser: Li, Yikai, Aruma Baduge, Gayan Amarasuriya
Format: Artikel
Sprache:eng
Schlagworte:
Channel estimation
Clusters
Codes
Contamination
Interference
massive MIMO
MIMO (control systems)
MIMO communication
NOMA
Nonorthogonal multiple access
performance analysis
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Zusammenfassung:A cell-free massive multiple-input multiple-output system with non-orthogonal multiple-access (NOMA) is investigated. An achievable sum rate is derived and compared against the orthogonal multiple access (OMA) counterpart. Thereby, the detrimental effects of intra-cluster pilot contamination, inter-cluster interference and imperfect successive interference cancellation (SIC) are investigated. The number of users served simultaneously by NOMA can be significantly higher than that of OMA. Nevertheless, the achievable sum rate of NOMA can be lower than that of OMA even in the regime of low number of users due to intra-cluster pilot contamination and error propagation of imperfect SIC.
ISSN:2162-2337
2162-2345
DOI:10.1109/LWC.2018.2841375