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Is NOMA Efficient in Multi-Antenna Networks? A Critical Look at Next Generation Multiple Access Techniques by Clerckx, Bruno; Mao, Yijie; Schober, Robert; Jorswieck, Eduard; Love, David J.; Yuan, Jinhong; Hanzo, Lajos; Li, Geoffrey Ye; Larsson, Erik G.; Caire, Giuseppe is a scholarly article available to read on EtoBox.

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In this paper, we take a critical and fresh look at the downlink multi-antenna NOMA literature. Instead of contrasting NOMA with OMA, we contrast NOMA with two other baselines. The first is conventional Multi-User Linear Precoding (MULP). The second is Rate-Splitting Multiple Access (RSMA) based on multi-antenna Rate-Splitting (RS) and SIC. We show that there is some confusion about the benefits of NOMA, and we dispel the associated misconceptions. First, we highlight why NOMA is inefficient in multi-antenna settings based on basic multiplexing gain analysis. We stress that the issue lies in how the NOMA literature has been hastily applied to multi-antenna setups, resulting in a misuse of spatial dimensions and therefore loss in multiplexing gains and rate. Second, we show that NOMA incurs a severe multiplexing gain loss despite an increased receiver complexity due to an inefficient use of SIC receivers. Third, we emphasize that much of the merits of NOMA are due to the constant comparison to OMA instead of comparing it to MULP and RS baselines. We then expose the pivotal design constraint that multi-antenna NOMA requires one user to fully decode the messages of the other users. Th

Author

Clerckx, Bruno; Mao, Yijie; Schober, Robert; Jorswieck, Eduard; Love, David J.; Yuan, Jinhong; Hanzo, Lajos; Li, Geoffrey Ye; Larsson, Erik G.; Caire, Giuseppe

Published

2021

Language

EN