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On the Uplink Max-Min SINR of Cell-Free Massive MIMO Systems

Bashar, Manijeh, Cumanan, Kanapathippillai, Burr, Alister G., Debbah, Merouane and Ngo, Hien Quoc (2019) On the Uplink Max-Min SINR of Cell-Free Massive MIMO Systems IEEE Transactions on Wireless Communications.

twc-bashar-2892463-proof_3_6_19.pdf - Accepted version Manuscript

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A cell-free Massive multiple-input multiple-output (MIMO) system is considered using a max-min approach to maximize the minimum user rate with per-user power constraints. First, an approximated uplink user rate is derived based on channel statistics. Then, the original max-min signal-to-interference-plus-noise ratio (SINR) problem is formulated for optimization of receiver filter coefficients at a central processing unit (CPU), and user power allocation. To solve this max-min non-convex problem, we decouple the original problem into two sub-problems, namely, receiver filter coefficient design and power allocation. The receiver filter coefficient design is formulated as a generalized eigenvalue problem whereas geometric programming (GP) is used to solve the user power allocation problem. Based on these two sub-problems, an iterative algorithm is proposed, in which both problems are alternately solved while one of the design variables is fixed. This iterative algorithm obtains a globally optimum solution, whose optimality is proved through establishing an uplink-downlink duality. Moreover, we present a novel sub-optimal scheme which provides a GP formulation to efficiently and globally maximize the minimum uplink user rate. The numerical results demonstrate that the proposed scheme substantially outperforms existing schemes in the literature.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Electronic Engineering
Authors :
Cumanan, Kanapathippillai
Burr, Alister G.
Debbah, Merouane
Ngo, Hien Quoc
Date : 29 January 2019
Funders : European Commission - 5GPPP project 5GXcast (H2020-ICT-2016-2 call)
DOI : 10.1109/TWC.2019.2892463
Copyright Disclaimer : © 2019 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Uncontrolled Keywords : MIMO communication; Uplink; Receivers, Signal to noise ratio; Interference; Central Processing Unit; Resource management
Additional Information : This article has been accepted for publication in a future issue of this journal, but has not been fully edited. Content may change prior to final publication.
Depositing User : Diane Maxfield
Date Deposited : 27 Mar 2019 14:28
Last Modified : 27 Mar 2019 14:28

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