Robust Beamforming Design in C-RAN With Sigmoidal Utility and Capacity-Limited Backhaul

Wang Z, Wing Kwan Ng D, Wong VWS, Schober R (2017)

Publication Language: English

Publication Type: Journal article

Publication year: 2017

Journal

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

Book Volume: 16

Pages Range: 5583 - 5598

Journal Issue: 9

DOI: 10.1109/TWC.2017.2712645

Abstract

In this paper, we study the robust beamforming design in cloud radio access networks, where remote radio heads (RRHs) are connected to a cloud server that performs signal processing and resource allocation in a centralized manner. Different from traditional approaches adopting a concave increasing function to model the utility of a user, we model the utility by a sigmoidal function of the signal-to-interference-plus-noise ratio (SINR) to capture the diminishing utility returns for very small and very large SINRs in real-time applications (e.g., video streaming). Our objective is to maximize the aggregate utility of the users while considering the imperfection of channel state information (CSI), limited backhaul capacity, and minimum quality of service requirements. Because of the sigmoidal utility function and some of the constraints, the formulated problem is non-convex. To efficiently solve the problem, we introduce a maximum interference constraint, transform the CSI uncertainty constraints into linear matrix inequalities, employ convex relaxation to handle the backhaul capacity constraints, and exploit the sum-of-ratios form of the objective function. This leads to an efficient resource allocation algorithm, which outperforms several baseline schemes, and closely approaches a performance upper bound for large CSI uncertainty or large number of RRHs.

Authors with CRIS profile

Robert Schober Lehrstuhl für Digitale Übertragung

Involved external institutions

University of New South Wales (UNSW) AU Australia (AU) University of British Columbia CA Canada (CA)

How to cite

APA:

Wang, Z., Wing Kwan Ng, D., Wong, V.W.S., & Schober, R. (2017). Robust Beamforming Design in C-RAN With Sigmoidal Utility and Capacity-Limited Backhaul. IEEE Transactions on Wireless Communications, 16(9), 5583 - 5598. https://dx.doi.org/10.1109/TWC.2017.2712645

MLA:

Wang, Zehua, et al. "Robust Beamforming Design in C-RAN With Sigmoidal Utility and Capacity-Limited Backhaul." IEEE Transactions on Wireless Communications 16.9 (2017): 5583 - 5598.

BibTeX: Download