On the Outage Performance of Non-Orthogonal Multiple Access With 1-bit Feedback

Xu P, Yuan Y, Ding Z, Dai X, Schober R (2016)

Publication Language: English

Publication Type: Journal article

Publication year: 2016

Journal

IEEE Transactions on Wireless Communications Institute of Electrical and Electronics Engineers (IEEE)

Book Volume: 15

Pages Range: 6716 - 6730

Journal Issue: 10

DOI: 10.1109/TWC.2016.2587880

Abstract

In this paper, the outage performance of downlink non-orthogonal multiple access (NOMA) is investigated for the case where each user feeds back only one bit of its channel state information (CSI) to the base station. Conventionally, opportunistic one-bit feedback has been used in fading broadcast channels to select only one user for transmission. In contrast, the considered NOMA scheme adopts superposition coding to serve all users simultaneously in order to improve user fairness. A closed-form expression for the common outage probability (COP) is derived, along with the optimal diversity gains under two types of power constraints. Particularly, it is demonstrated that the diversity gain under a long-term power constraint is twice as large as that under a short-term power constraint. Furthermore, we study dynamic power allocation optimization for minimizing the COP, based on one-bit CSI feedback. This problem is challenging, since the objective function is non-convex; however, under the short-term power constraint, we demonstrate that the original problem can be transformed into a set of convex problems. Under the long-term power constraint, an asymptotically optimal solution is obtained for high signal-to-noise ratio.

Authors with CRIS profile

Robert Schober Lehrstuhl für Digitale Übertragung

Involved external institutions

Lancaster University GB United Kingdom (GB) University of Manchester GB United Kingdom (GB) Chinese Academy of Sciences (CAS) / 中国科学院 CN China (CN) Chongqing University of Posts and Telecommunications (CQUPT) / 重庆邮电大学 CN China (CN)

How to cite

APA:

Xu, P., Yuan, Y., Ding, Z., Dai, X., & Schober, R. (2016). On the Outage Performance of Non-Orthogonal Multiple Access With 1-bit Feedback. IEEE Transactions on Wireless Communications, 15(10), 6716 - 6730. https://doi.org/10.1109/TWC.2016.2587880

MLA:

Xu, Peng, et al. "On the Outage Performance of Non-Orthogonal Multiple Access With 1-bit Feedback." IEEE Transactions on Wireless Communications 15.10 (2016): 6716 - 6730.

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