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Joint Downlink/Uplink Design for Wireless Powered Networks with Interference

Research output: Contribution to journalArticle

Panagiotis Diamantoulakis,, Koralia Pappi, George K. Karagiannidis,, Hong Xing, Arumugam Nallanathan

Original languageEnglish
Pages (from-to)1534-1547
JournalIEEE Access
Volume5
DOIs
Publication statusPublished - 25 Jan 2017

Documents

  • Joint Downlink/Uplink Design for Wireless_DIAMANTOULAKIS_AcceptedJan2017_GREEN AAM

    FINAL_Article.pdf, 2 MB, application/pdf

    20/01/2017

    Accepted author manuscript

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    (c) 2017 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.

King's Authors

Abstract

This paper jointly investigates the downlink/uplink of wireless powered networks (WPNs), which are exposed to the effect of the cascaded near-far problem, i.e., the asymmetric overall degradation of the users’ performance, due to different
path-loss values. More specifically, assuming that the users are able to harvest energy both from interference and desired signals, higher path-loss reduces the downlink rate of the far user, while it also negatively affects its uplink rate, since less energy can be harvested during downlink. Furthermore, if the far user is located at the cell-edge, its performance is more severely impaired by
interference, despite the potential gain due to energy harvesting from interference signals. To this end, we fairly maximize the downlink/uplink users’ rates, by utilizing corresponding priority weights. Two communication protocols are taken into account for the downlink, namely time division multiple access (TDMA) and non orthogonal multiple access (NOMA), while NOMA with timesharing is considered for the uplink. The formulated multidimensional
non-convex optimization problems are transformed into the equivalent convex ones and can be solved with low complexity. Simulations results illustrate that: i) a relatively high downlink rate can be achieved, while the required energy is simultaneously harvested by the users for the uplink, ii) dowlink NOMA is a
more appropriate option with respect to the network topology, especially when a high downlink rate is desired.

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