On the capacity comparison between MIMO-NOMA and MIMO-OMA

Yang Liu*, Gaofeng Pan, Hongtao Zhang, Mei Song

*此作品的通讯作者

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摘要

Non-orthogonal multiple access (NOMA) has been shown in the literature to have a better performance than OMA in terms of sum channel capacity; however, the capacity superiority of NOMA over OMA has been only proved for single antenna systems, and the proof for the capacity superiority of multiple-input multiple-output NOMA (MIMO-NOMA) over conventional MIMO-OMA has not been available yet. In this paper, we will provide our proof to demonstrate that the MIMO-NOMA is strictly better than MIMO-OMA in terms of sum channel capacity (except for the case where only one user is being communicated to), i.e., for any rate pair achieved by MIMO-OMA, there is a power split for which MIMO-NOMA can achieve rate pairs that are strictly larger. Based on this result, we prove that the MIMO-NOMA can also achieve a larger sum ergodic capacity than MIMO-OMA. Our analytical results are verified by simulations.

源语言英语
文章编号7465730
页(从-至)2123-2129
页数7
期刊IEEE Access
4
DOI
出版状态已出版 - 2016
已对外发布

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Liu, Y., Pan, G., Zhang, H., & Song, M. (2016). On the capacity comparison between MIMO-NOMA and MIMO-OMA. IEEE Access, 4, 2123-2129. 文章 7465730. https://doi.org/10.1109/ACCESS.2016.2563462