Green Communication for NOMA-Based CRAN

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Green Communication for NOMA-Based CRAN

Hao, W; Chu, Z; Zhou, F; Yang, S; Sun, G; Wong, KK; (2018) Green Communication for NOMA-Based CRAN. IEEE Internet of Things Journal 10.1109/JIOT.2018.2852808. (In press). Green open access

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Abstract

The number of wireless devices is growing rapidly on a daily basis echoing the increasing number of applications of the Internet of Thing (IoT). Facing massive connections and unavoidable interference, how to provide a green communication is a concerning matter. In this regard, non-orthogonal multiple-access (NOMA) is a natural communications technology that can scale with the massive number of simultaneous connections for a limited bandwidth. In this paper, we aim to maximize the energy efficiency (EE) for a NOMA-based cloud radio access network (CRAN), where sub-6 GHz and millimeter wave (mmWave) bands are used in fronthaul and access links, respectively. In particular, we formulate the power optimization problem to maximize the EE of the system subject to the fronthaul capacity and transmit power constraints. To address this nonconvex problem, we first convert the fractional objective function into a subtractive form. A two-layer algorithm is then proposed. In the outer loop, the ℓ1-norm technique is adopted to transform the nonconvex fronthaul capacity constraint into a convex one, whereas in the inner loop, the weighted minimum mean square error (WMMSE) approach is applied. Simulation results indicate that the proposed NOMA scheme can obtain higher EE as well as throughput when compared with orthogonal multiple-access (OMA) methods.

Type:	Article
Title:	Green Communication for NOMA-Based CRAN
Open access status:	An open access version is available from UCL Discovery
DOI:	10.1109/JIOT.2018.2852808
Publisher version:	https://doi.org/10.1109/JIOT.2018.2852808
Language:	English
Additional information:	This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords:	NOMA, Wireless communication, Internet of Things, Resource management, Quality of service, Microwave devices, Microwave communication
UCL classification:	UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI:	https://discovery.ucl.ac.uk/id/eprint/10055242