C-RAN with Hybrid RF/FSO Fronthaul Links: Joint Optimization of RF Time Allocation and Fronthaul Compression

Najafi Kalyani M, Jamali V, Wing Kwan Ng D, Schober R (2017)

Publication Language: English

Publication Type: Conference contribution

Publication year: 2017

Event location: Singapore SG

ISBN: 978-1-5090-5019-2

DOI: 10.1109/GLOCOM.2017.8254767

Abstract

This paper considers the uplink of a cloud radio access network (C-RAN) comprised of several multi-antenna remote radio units (RUs) which send the data that they received from multiple mobile users (MUs) to a central unit (CU) via a wireless fronthaul link. One of the fundamental challenges in implementing C-RAN is the huge data rate required for fronthauling. To address this issue, we employ hybrid radio frequency (RF)/free space optical (FSO) systems for the fronthaul links as they benefit from both the large data rates of FSO links and the reliability of RF links. To efficiently exploit the fronthaul capacity, the RUs employ vector quantization to jointly compress the signals received at their antennas. Moreover, due to the limited available RF spectrum, we assume that the RF multiple-access and fronthaul links employ the same RF resources. Thereby, we propose an adaptive protocol which allocates transmission time to the RF multiple-access and fronthaul links in a time division duplex (TDD) manner and optimizes the quantization noise covariance matrix at each RU such that the sum rate is maximized. Our simulation results reveal that a considerable gain in terms of sum rate can be achieved by the proposed protocol in comparison with benchmark schemes from the literature, especially when the FSO links experience unfavorable atmospheric conditions.

Authors with CRIS profile

Marzieh Najafi Lehrstuhl für Digitale Übertragung Vahid Jamali Kooshkghazi Lehrstuhl für Digitale Übertragung Robert Schober Lehrstuhl für Digitale Übertragung

Involved external institutions

University of New South Wales (UNSW) AU Australia (AU)

How to cite

APA:

Najafi Kalyani, M., Jamali, V., Wing Kwan Ng, D., & Schober, R. (2017). C-RAN with Hybrid RF/FSO Fronthaul Links: Joint Optimization of RF Time Allocation and Fronthaul Compression. In IEEE (Eds.), Proceedings of the GLOBECOM 2017 - 2017 IEEE Global Communications Conference. Singapore, SG.

MLA:

Najafi Kalyani, Marzieh, et al. "C-RAN with Hybrid RF/FSO Fronthaul Links: Joint Optimization of RF Time Allocation and Fronthaul Compression." Proceedings of the GLOBECOM 2017 - 2017 IEEE Global Communications Conference, Singapore Ed. IEEE, 2017.

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