Spectral Efficiency for Massive MIMO Multi-Relay NOMA Systems with CSI errors

We consider a multiple-relay-aided massive multi-input multi-output (MIMO) non-orthogonal multiple access (NOMA) system. We practically model this system by considering channel estimation error, and the consequent imperfect successive interference cancellation, which the existing literature has igno...

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Bibliographic Details
Published in2020 28th European Signal Processing Conference (EUSIPCO) pp. 1648 - 1652
Main Authors Mandawaria, Vikalp, Sharma, Ekant, Budhiraja, Rohit
Format Conference Proceeding
LanguageEnglish
Published Eurasip 24.01.2021
Subjects
Degradation
Interference cancellation
Massive antennas
Massive MIMO
NOMA
relays
Signal processing
Silicon carbide
Spectral efficiency
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Summary:We consider a multiple-relay-aided massive multi-input multi-output (MIMO) non-orthogonal multiple access (NOMA) system. We practically model this system by considering channel estimation error, and the consequent imperfect successive interference cancellation, which the existing literature has ignored. We derive a novel lower bound for the ergodic spectral efficiency of this multi-relay NOMA system, and characterize its degradation with respect to orthogonal multiple access (OMA), due to the aforementioned artifacts. We crucially show that a multi-relay massive MIMO NOMA system requires accurate channel information to outperform OMA.
ISSN:2076-1465
DOI:10.23919/Eusipco47968.2020.9287746