eprintid: 10076868
rev_number: 18
eprint_status: archive
userid: 608
dir: disk0/10/07/68/68
datestamp: 2019-06-27 13:23:13
lastmod: 2021-10-24 23:55:25
status_changed: 2019-06-27 13:23:13
type: article
metadata_visibility: show
creators_name: Salem, A
creators_name: Musavian, L
creators_name: Hamdi, KA
title: Wireless power transfer in distributed antenna systems
ispublished: pub
divisions: UCL
divisions: B04
divisions: C05
divisions: F46
keywords: Wireless communication, Antenna arrays, Receivers, Interference, MIMO communication, Protocols
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abstract: This paper studies the performance of wireless power transfer in distributed antenna systems (DAS). In particular, the distributed remote radio heads (RRHs), which are conventionally distributed in the network to enhance the performance, are also used to increase the energy harvesting (EH) at the energy-constrained users. Based on this idea, the network area is divided into two zones, namely: 1) EH zone and 2) interference zone. The users in the EH zones are guaranteed to harvest sufficient energy from the closed RRH, while the users in the interference zones harvest energy from the surrounding RRHs. A harvest-then-transmit protocol is adopted, where in the power transfer phase the multiple antennas RRHs broadcast energy signals to the users. In the information transmission phase, the users utilize the harvested energy to transmit their signals to the RRHs. In addition, zero-forcing is applied at the RRHs receivers, to mitigate the interference. The system spectral efficiency is evaluated in two different scenarios based on the channel state information (CSI) namely: 1) CSI is unknown at the RRHs 2) CSI is perfectly known at the RRHs. In contrast to conventional EH-muliple-input multiple-output (MIMO) systems, performance analysis of EH DAS-MIMO is a challenging problem, because the channels are characterized by non-identical path-loss and EH effects which make the classical analytical methods non-tractable. In light of this, new analytical expressions of the ergodic spectral efficiency are derived and then Monte Carlo simulations are provided to verify the accuracy of our analysis. The effects of main system parameters on the EH-DAS performance are investigated. The results show that there is an optimal value of the EH time for each users locations that maximizes the system performance. In addition, size of the EH-zone area depends on the required harvested power at the users which is dependent essentially on the target spectral efficiency.
date: 2019-01-01
date_type: published
official_url: https://doi.org/10.1109/TCOMM.2018.2865481
oa_status: green
full_text_type: pub
language: eng
primo: open
primo_central: open_green
article_type_text: Journal Article
verified: verified_manual
elements_id: 1629751
doi: 10.1109/TCOMM.2018.2865481
lyricists_name: Albaraesi, Abdelhamid
lyricists_id: ASALE76
actors_name: Flynn, Bernadette
actors_id: BFFLY94
actors_role: owner
full_text_status: public
publication: IEEE Transactions on Communications
volume: 67
number: 1
pagerange: 737-747
issn: 1558-0857
citation:        Salem, A;    Musavian, L;    Hamdi, KA;      (2019)    Wireless power transfer in distributed antenna systems.                   IEEE Transactions on Communications , 67  (1)   pp. 737-747.    10.1109/TCOMM.2018.2865481 <https://doi.org/10.1109/TCOMM.2018.2865481>.       Green open access   
 
document_url: https://discovery.ucl.ac.uk/id/eprint/10076868/1/08435943%20%281%29.pdf