Closed-form Symbol Error Rate Expressions for Non-orthogonal Multiple Access Systems

Authors

Q. He, Y. Hu, A. Schmeink,

Abstract

        In this paper, the reliability performance of a non-orthogonal multiple access (NOMA) system is addressed. We characterize the reliability performance of the users in a downlink power domain NOMA system with arbitrary ordered pulse-amplitude modulation and quadrature amplitude modulation. In particular, the exact symbol error rate (SER) expressions are derived. Furthermore, by taking the power allocation between users into account, a reliability optimization problem is formulated, which minimizes the SER of the user with a good channel quality while guaranteeing the reliability requirement for the user with a relatively poor channel. Based on the characterized SER model, a suboptimal power allocation approach for this problem is provided with a performance extremely close to the optimal solution. Through simulations, we validate the provided SER characterization and confirm the effectiveness of the proposed suboptimal power allocation policy.

BibTEX Reference Entry 

@article{HeHuSc19c,
	author = {Qinwei He and Yulin Hu and Anke Schmeink},
	title = "Closed-form Symbol Error Rate Expressions for Non-orthogonal Multiple Access Systems",
	pages = "6775 - 6789",
	journal = "{IEEE} Transactions on Vehicular Technology",
	volume = "68",
	number = "7",
	doi = 10.1109/TVT.2019.2917579,
	month = May,
	year = 2019,
	hsb = RWTH-2019-09697,
	}

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