Title
Performance analysis for industrial wireless networks
Creator
Zdravković, Nemanja M.
Copyright date
2017
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Autorstvo-Deliti pod istim uslovima 3.0 Srbija (CC BY-SA 3.0)
License description
Dozvoljavate umnožavanje, distribuciju i javno saopštavanje dela, i prerade, ako se navede ime autora na način odredjen od strane autora ili davaoca licence i ako se prerada distribuira pod istom ili sličnom licencom. Ova licenca dozvoljava komercijalnu upotrebu dela i prerada. Slična je softverskim licencama, odnosno licencama otvorenog koda. Osnovni opis Licence: http://creativecommons.org/licenses/by-sa/3.0/rs/deed.sr_LATN Sadržaj ugovora u celini: http://creativecommons.org/licenses/by-sa/3.0/rs/legalcode.sr-Latn
Language
English
Cobiss-ID
Theses Type
Doktorska disertacija
description
Datum odbrane: 26.06.2017.
Other responsibilities
mentor
Kansanen, Kimmo;
član komisije
Chatzigeorgiou, Ioannis
član komisije
Petersen, Stig
član komisije
Milović, Daniela
član komisije
Čiča, Zoran
član komisije
Werner, Stefan
mentor
Đorđević, Goran
Academic Expertise
Tehničko-tehnološke nauke
University
Univerzitet u Nišu
Faculty
Elektronski fakultet
Group
Katedra za telekomunikacije
Alternative title
Analiza performansi za industrijske bežične mreže
Publisher
Norwegian University of science and technology = Norveški Univerzitet za nauku i tehnologiju
Format
XXI, 113 str.
description
Doctoral thesis at NTNU, 2017:64;
Norwegian, Bosnian and Serbian cooperation platform for university and industry ICT R&D - NORBAS;
Bibliografija: str. 101-113.
description
Telecommunications
Abstract (en)
Industrial wireless networks operate in harsher and noisier environments compared to
traditional wireless networks, while demanding high reliability and low latency. These
requirements, combined with the constant need for better coverage, higher data rates
and overall seamless user experience call for a paradigm shift in communication in regards
to the previous generations of technologies used. Cooperative diversity is one such
approach.
The main focus of this thesis is on the performance analysis of cooperative wireless
networks set in industrial environments – where the network, apart from additive white
Gaussian noise, is subject to multipath fading and shadowing, and/or temporary random
blockage effects. In these scenarios, in order to achieve specific performance metrics
such as error rates or outage probabilities, existing cooperative strategies are aided by
protocols in the channel between the cooperating nodes. Moreover, pair-wise analysis
investigates the correlation of multiple data flows.
Building upon existing repetition protocols, outage performance of a network subject
to fading and shadowing is observed, and the effects of fading and shadowing severity,
network dimension, average signal-to-noise ratio values and packet length are discussed.
Special cases are also observed, in which the composite fading channel is reduced to
several familiar propagation environments, unifying the analysis.
Afterwards, the analysis of more complex protocols is presented, taking into account
random blockage in the channels between cooperating nodes. A novel, threshold-based
internode protocol is introduced, which improves performance by listening to the transmissions
and choosing whether to send a packet immediately or after a waiting period.
As these two periods are close, the effect of temporal correlation is also investigated.
Apart from the exact outage probability expressions, simpler asymptotic expressions,
with and without blockage, are derived as well, giving a better insight on the network
behaviour at high average signal-to-noise ratio regimes.
Both outage probability and packet error rate can be also improved by adding automatic
repeat request schemes in the channel between cooperating nodes, which again
utilize the internode channels by re-sending data until it can be successfully decoded.
Error-free communication can be achieved, but at a delay cost. Nevertheless, a trade-off
between performance gains and delays remains, and can therefore be used for designing
wireless networks with different requirements – error-free or low-latency.
Finally, joint outage performance is investigated. Using a generic approach, which
can be applied to any sort of data where multiple sources are communicating over wireless
networks, pair-wise behaviour is investigated. As a result, any multi-route diversity
type of scheme will have this sort of behaviour, since particular point-to-point relay links
are being shared by source nodes. This in turn means that the performance of those
flows will be correlated. For higher layers, there is a difference in the behaviour, meaning
that when errors are correlated, data flows start behaving correlated as well. As a
result, negative acknowledgements may start to correlate as well. All of this contributes
to the network behaving in a correlated way, i.e., when something happens, it tends to
happen to more than one data flow.
Authors Key words
cooperative communications, decode-and-forward relaying, error rate analysis, fading
channels, outage probability, shadowing, wireless networks
Authors Key words
bežične mreže, kooperativne mreže, decode-and-forward rejelni sistemi, efekti senke,
kanali za fedingom, verovatnoća greške, verovatnoća prekida
Classification
(621.391+621.395.38):519.724
Subject
T 180
Type
Tekst
Abstract (en)
Industrial wireless networks operate in harsher and noisier environments compared to
traditional wireless networks, while demanding high reliability and low latency. These
requirements, combined with the constant need for better coverage, higher data rates
and overall seamless user experience call for a paradigm shift in communication in regards
to the previous generations of technologies used. Cooperative diversity is one such
approach.
The main focus of this thesis is on the performance analysis of cooperative wireless
networks set in industrial environments – where the network, apart from additive white
Gaussian noise, is subject to multipath fading and shadowing, and/or temporary random
blockage effects. In these scenarios, in order to achieve specific performance metrics
such as error rates or outage probabilities, existing cooperative strategies are aided by
protocols in the channel between the cooperating nodes. Moreover, pair-wise analysis
investigates the correlation of multiple data flows.
Building upon existing repetition protocols, outage performance of a network subject
to fading and shadowing is observed, and the effects of fading and shadowing severity,
network dimension, average signal-to-noise ratio values and packet length are discussed.
Special cases are also observed, in which the composite fading channel is reduced to
several familiar propagation environments, unifying the analysis.
Afterwards, the analysis of more complex protocols is presented, taking into account
random blockage in the channels between cooperating nodes. A novel, threshold-based
internode protocol is introduced, which improves performance by listening to the transmissions
and choosing whether to send a packet immediately or after a waiting period.
As these two periods are close, the effect of temporal correlation is also investigated.
Apart from the exact outage probability expressions, simpler asymptotic expressions,
with and without blockage, are derived as well, giving a better insight on the network
behaviour at high average signal-to-noise ratio regimes.
Both outage probability and packet error rate can be also improved by adding automatic
repeat request schemes in the channel between cooperating nodes, which again
utilize the internode channels by re-sending data until it can be successfully decoded.
Error-free communication can be achieved, but at a delay cost. Nevertheless, a trade-off
between performance gains and delays remains, and can therefore be used for designing
wireless networks with different requirements – error-free or low-latency.
Finally, joint outage performance is investigated. Using a generic approach, which
can be applied to any sort of data where multiple sources are communicating over wireless
networks, pair-wise behaviour is investigated. As a result, any multi-route diversity
type of scheme will have this sort of behaviour, since particular point-to-point relay links
are being shared by source nodes. This in turn means that the performance of those
flows will be correlated. For higher layers, there is a difference in the behaviour, meaning
that when errors are correlated, data flows start behaving correlated as well. As a
result, negative acknowledgements may start to correlate as well. All of this contributes
to the network behaving in a correlated way, i.e., when something happens, it tends to
happen to more than one data flow.
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