Low-Complexity Beam Allocation for Switched-Beam Based Multiuser Massive MIMO Systems

Wang, Junyuan, Zhu, Huiling, Dai, Lin, Gomes, Nathan, J. and Wang, Jiangzhou (2016) Low-Complexity Beam Allocation for Switched-Beam Based Multiuser Massive MIMO Systems. IEEE Transactions on Wireless Communications, 15 (2). pp. 8236-7248. ISSN 1536-1276 DOI https://doi.org/10.1109/TWC.2016.2613517

[img]
Preview
Text
Beam Allocation - Junyuan Wang.pdf - Accepted Version
Available under License Creative Commons Attribution Non-commercial No Derivatives.

Download (1MB) | Preview

Abstract

This paper addresses the beam allocation problem in a switched-beam based massive multiple-input-multiple-output (MIMO) system working at the millimeter wave frequency band, with the target of maximizing the sum data rate. This beam allocation problem can be formulated as a combinatorial optimization problem under two constraints that each user uses at most one beam for its data transmission and each beam serves at most one user. The brute-force search is a straightforward method to solve this optimization problem. However, for a massive MIMO system with a large number of beams N, the brute-force search results in intractable complexity O(NK), where K is the number of users. In this paper, in order to solve the beam allocation problem with affordable complexity, a suboptimal low-complexity beam allocation (LBA) algorithm is developed based on submodular optimization theory, which has been shown to be a powerful tool for solving combinatorial optimization problems. Simulation results show that our proposed LBA algorithm achieves nearly optimal sum data rate with complexity O(K log N). Furthermore, the average service ratio, i.e., the ratio of the number of users being served to the total number of users, is theoretically analyzed and derived as an explicit function of the ratio N/K.

Item Type: Article
Uncontrolled Keywords: Switched-beam based systems, beam allocation algorithm, sum data rate, submodular optimization, service ratio, massive multiple-input-multiple-output (MIMO)
Subjects: Q Science > QA Mathematics > QA75 Electronic computers. Computer science
Divisions: Computing and Information Systems
Date Deposited: 04 Apr 2018 14:08
URI: http://repository.edgehill.ac.uk/id/eprint/10216

Archive staff only

Item control page Item control page