Rate Analysis of Cell-Free Massive MIMO-NOMA With Three Linear Precoders

Although the hybrid of cell-free (CF) massive multiple-input multiple-output (MIMO) and non-orthogonal multiple access (NOMA) promises massive spectral efficiency gains, the type of precoders employed at the access points (APs) impacts the gains. In this paper, we thus comprehensively evaluate the s...

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Bibliographic Details
Published in:IEEE transactions on communications Vol. 68; no. 6; pp. 3480 - 3494
Main Authors: Rezaei, Fatemeh, Tellambura, Chintha, Tadaion, Ali Akbar, Heidarpour, Ali Reza
Format: Journal Article
Language:English
Published: New York IEEE 01.06.2020
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
achievable sum rate
cell-free massive MIMO
Channel estimation
Clusters
Codes
Contamination
fpZF
Interference
MIMO communication
modified RZF
MRT
NOMA
Nonorthogonal multiple access
Performance evaluation
Precoding
Silicon carbide
ISSN:0090-6778, 1558-0857
Online Access:Get full text
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Summary:Although the hybrid of cell-free (CF) massive multiple-input multiple-output (MIMO) and non-orthogonal multiple access (NOMA) promises massive spectral efficiency gains, the type of precoders employed at the access points (APs) impacts the gains. In this paper, we thus comprehensively evaluate the system performance with maximum ratio transmission (MRT), full-pilot zero-forcing (fpZF) and modified regularized ZF (mRZF) precoders. We derive their closed-form sum rate expressions by considering Rayleigh fading channels, the effects of intra-cluster pilot contamination, inter-cluster interference, and imperfect successive interference cancellation (SIC). Our results reveal that this system supports significantly more users simultaneously at the same coherence interval compared to its OMA equivalent. However, intra-cluster pilot contamination and imperfect SIC degrade the system performance when the number of users is low. Moreover, with perfect SIC, mRZF and fpZF significantly outperform MRT. Also, we show that this system with either mRZF or fpZF precoding outperforms OMA systems with MRT. The analytical findings are verified by numerical results.
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ISSN:0090-6778
1558-0857
DOI:10.1109/TCOMM.2020.2978189