Energy-Efficient Full-Duplex Cooperative Nonorthogonal Multiple Access

Wei, Zhongxiang, Zhu, Xu ORCID: 0000-0002-7371-4595, Sun, Sumei, Wang, Jingjing and Hanzo, Lajos
(2018) Energy-Efficient Full-Duplex Cooperative Nonorthogonal Multiple Access. IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, 67 (10). pp. 10123-10128.

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The full-duplex (FD) cooperative nonorthogonal multiple access (NOMA) achieves a superior throughput over the conventional half-duplex (HD) cooperative NOMA, wherein the strong users (SUs) with good channel conditions can act as an FD relay node for the weak users with poor channel conditions. However, the energy efficiency (EE) of a cooperative NOMA may be degraded due to the additional power consumption incurred at the SUs. We are, therefore, motivated to investigate the EE maximization problem of an FD cooperative NOMA system. More importantly, we investigate the 'signal-to-inference-noise ratio gap reversal' problem of cooperative NOMA systems, which imposes successive interference cancellation (SIC) performance degradation at the SUs. This problem has not been documented in the existing cooperative NOMA literature. A low-complexity algorithm is proposed for maximizing the system's EE while guaranteeing a successful SIC operation. Our numerical results show that the proposed algorithm achieves both a higher EE and throughput over the existing HD cooperative NOMA and nonadaptive FD cooperative NOMA. More importantly, the proposed scheme guarantees a successful SIC operation at the SUs.

Item Type: Article
Uncontrolled Keywords: Cooperative non-orthogonal multiple access, full-duplex, energy efficiency
Depositing User: Symplectic Admin
Date Deposited: 15 Oct 2018 14:05
Last Modified: 17 Mar 2024 00:13
DOI: 10.1109/TVT.2018.2864545
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