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Optimal Energy-efficient Joint Resource Allocation for Multi-hop MIMO-AF Systems

Heliot, F and Tafazolli, R (2016) Optimal Energy-efficient Joint Resource Allocation for Multi-hop MIMO-AF Systems IEEE Transactions on Communications, 64 (9). pp. 3655-3668.

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Abstract

Energy efficiency (EE) is a key enabler for the next generation of communication systems. Equally, resource allocation and cooperative communication are effective tech-niques for improving communication system performance. In this paper, we propose an optimal energy-efficient joint resource allocation method for the multi-hop multiple-input-multiple-output (MIMO) amplify-and-forward (AF) system. We define the joint source and multiple relays optimization problem and prove that its objective function, which is not generally quasiconvex, can be lower-bounded by a convex function. Moreover, all the minima of this objective function are strict minima. Based on these two properties, we then simplify the original multivariate optimization problem into a single variable problem and design a novel approach for optimally solving it in both the unconstraint and power constraint cases. In addition, we provide a sub-optimal approach with reduced complexity; the latter reduces the computational complexity by a factor of up to 40 with near-optimal performance. We finally utilize our novel approach for comparing the optimal energy-per-bit consumption of multi-hop MIMO-AF and MIMO systems; results indicate that MIMO-AF can help to save energy when the direct link quality is poor.

Item Type: Article
Subjects : Electronic Engineering
Divisions : Faculty of Engineering and Physical Sciences > Electronic Engineering
Authors :
AuthorsEmailORCID
Heliot, FUNSPECIFIEDUNSPECIFIED
Tafazolli, RUNSPECIFIEDUNSPECIFIED
Date : 7 July 2016
Identification Number : 10.1109/TCOMM.2016.2587291
Copyright Disclaimer : (c) 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, 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 components of this work in other works.
Uncontrolled Keywords : Energy efficiency, resource allocation, MIMO, amplify-and-forward, multi-hop
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 29 Jun 2016 15:17
Last Modified : 27 Oct 2016 12:47
URI: http://epubs.surrey.ac.uk/id/eprint/811076

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