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Joint Precoding and RRH selection for User-centric Green MIMO C-RAN

Pan, Cunhua, Zhu, Huiling, Gomes, Nathan J., Wang, Jiangzhou (2017) Joint Precoding and RRH selection for User-centric Green MIMO C-RAN. IEEE Transactions on Wireless Communications, 16 (5). pp. 2891-2906. ISSN 1536-1276. (doi:10.1109/TWC.2017.2671358) (KAR id:61753)

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http://dx.doi.org/10.1109/TWC.2017.2671358

Abstract

This paper jointly optimizes the precoding matrices and the set of active remote radio heads (RRHs) to minimize the network power consumption (NPC) for a user-centric cloud radio access network (C-RAN), where both the RRHs and users have multiple antennas and each user is served by its nearby RRHs. Both users’ rate requirements and per-RRH power constraints are considered. Due to these conflicting constraints, this optimization problem may be infeasible. In this paper, we propose to solve this problem in two stages. In Stage I, a low-complexity user selection algorithm is proposed to find the largest subset of feasible users. In Stage II, a low-complexity algorithm is proposed to solve the optimization problem with the users selected from Stage I. Specifically, the re-weighted l1-norm minimization method is used to transform the original problem with non-smooth objective function into a series of weighted power minimization (WPM) problems, each of which can be solved by the weighted minimum mean square error (WMMSE) method. The solution obtained by the WMMSE method is proved to satisfy the Karush-Kuhn-Tucker (KKT) conditions of the WPM problem. Moreover, a low-complexity algorithm based on Newton’s method and the gradient descent method is developed to update the precoder matrices in each iteration of the WMMSE method. Simulation results demonstrate the rapid convergence of the proposed algorithms and the benefits of equipping multiple antennas at the user side. Moreover, the proposed algorithm is shown to achieve near-optimal performance in terms of NPC.

Item Type: Article
DOI/Identification number: 10.1109/TWC.2017.2671358
Projects: [UNSPECIFIED] intelligent Converged network consolidating Radio and optical access aRound USer equipment
Uncontrolled keywords: Cloud radio access network (C-RAN), Usercentric network, MIMO systems, User selection, Green communications
Subjects: T Technology > TK Electrical engineering. Electronics. Nuclear engineering > TK6540 Radio
Divisions: Faculties > Sciences > School of Engineering and Digital Arts > Broadband & Wireless Communications
Depositing User: Huiling Zhu
Date Deposited: 17 May 2017 09:19 UTC
Last Modified: 29 Apr 2020 03:09 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/61753 (The current URI for this page, for reference purposes)
Pan, Cunhua: https://orcid.org/0000-0001-5286-7958
Gomes, Nathan J.: https://orcid.org/0000-0003-3763-3699
Wang, Jiangzhou: https://orcid.org/0000-0003-0881-3594
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