Channel sensing and communication over a time-correlated channel with an energy harvesting transmitter

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Title: Channel sensing and communication over a time-correlated channel with an energy harvesting transmitter
Authors: Abad, MSH
Ercetin, O
Gunduz, D
Item Type: Journal Article
Abstract: An energy harvesting (EH) transmitter communicating over a time-correlated wireless channel is considered. The transmitter is capable of sensing the current channel state, albeit at the cost of both energy and transmission time. The EH transmitter aims to maximize its long-term throughput by choosing one of the following actions: 1) defer its transmission to save energy for future use; 2) transmit reliably at a low rate; 3) transmit at a high rate; and 4) sense the channel to reveal the channel state at a cost of energy and transmission time, and then decide to defer or to transmit. The problem is formulated as a partially observable Markov decision process with a belief on the channel state. The optimal policy is shown to exhibit a threshold behavior on the belief state, with battery-dependent threshold values. The optimal threshold values and performance are characterized numerically via the value iteration algorithm as well as a policy search algorithm that exploits the threshold structure of the optimal policy. Our results demonstrate that, despite the associated time and energy cost, sensing the channel intelligently to track the channel state improves the achievable long-term throughput significantly as compared to the performance of those protocols lacking this ability as well as the one that always senses the channel.
Issue Date: 1-Mar-2018
Date of Acceptance: 15-Oct-2017
ISSN: 2473-2400
Publisher: IEEE
Start Page: 114
End Page: 126
Journal / Book Title: IEEE Transactions on Green Communications and Networking
Volume: 2
Issue: 1
Copyright Statement: © 2018 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.
Sponsor/Funder: British Council (UK)
Commission of the European Communities
Commission of the European Communities
Funder's Grant Number: 173605884
Publication Status: Published
Online Publication Date: 2017-10-24
Appears in Collections:Faculty of Engineering
Electrical and Electronic Engineering

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