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Title:ERROR PROBABILITY MODEL FOR IEEE 802.15.4 WIRELESS TRANSMISSION WITH CO-CHANNEL INTERFERENCE AND BACKGROUND NOISE
Authors:Pešović, Uroš (Author)
Planinšič, Peter (Mentor) More about this mentor... New window
Files:.pdf EDOK_Pesovic_Uros_2016.pdf (8,20 MB)
 
Language:English
Work type:Dissertation (m)
Typology:2.08 - Doctoral Dissertation
Organization:FERI - Faculty of Electrical Engineering and Computer Science
Abstract:Data transmission sent through wireless channel is usually affected by background noise, multipath fading and interference which cause data errors. Influence of such disturbances is the most commonly expressed in a form of error probability statistics. Effects of these disturbances on IEEE 802.15.4 wireless transmissions are previously studied, except influence of co-channel interference (CCI) which originates from collision between IEEE 802.15.4 devices which perform simultaneous radio transmission. Our thesis puts forward the assumption that it is possible to derive more accurate analytical error probability model for higher data level error probability parameters without the idealization of PN spreading sequences. Additionally, thesis is that is possible to derive an accurate analytical error probability model in the case of CCI influenced by background noise by consideration of constellation diagram. IEEE 802.15.4 standard uses CSMA/CA (Carrier Sense Multiple Access with Collision Detection) channel access mechanism to prevent collisions between devices, but this mechanism doesn't provide protection from hidden node problem which is primary source of co-channel interference. Using Monte Carlo simulations we determined frequency of hidden node collisions, which shown that co-channel interference frequently occur in parts of the network with high traffic load. Some prior works in this field tend to idealize these non-ideal spreading sequences in order to simplify calculations for error probability parameters. Our doctor thesis presents analytical model of data level error probability parameters (symbol, bit and packet) for IEEE 802.15.4, which uses original non-ideal spreading sequences without their idealization. Proposed error probability model consists of mutually dependent chip, symbol, bit and packet error probability models. Derived error probability models are linked together, so each of error probability parameters can be determined using error probability parameter from the previous stage. Error probability model for IEEE 802.15.4 wireless communication could be used in network simulation tools in order to accurately simulate energy efficient medium access protocols in realistic scenarios. Presented theoretical results are tested by independent numerical simulation of IEEE 802.15.4 transmission according to Monte Carlo method. Simulation results shows that derived models for error probability parameters were matched by two simulation scenarios in background noise, for multipath fading and co-channel interface, respectively Furthermore, the accuracy of derived mathematical models was tested in real-world experiment using IEEE 802.15.4 compliant wireless transceivers for creating co-channel interference. Packets were received by software defined radio platform, which enabled realization of coherent receiver in which all error probability statistics could be collected. The results of the experiment show consistency with proposed analytical error probability models, but some deviations are caused by poor preamble synchronization under low SNR (Signal to Noise Ratio) value. The thesis was proved with Monte Carlo simulations of the physical level of the IEEE 802.15.4 communication and experimental measurements on a real physical communication system.
Keywords:IEEE 802.15.4 standard; error probability model; co-channel interference; Rician fading channel; additive white Gaussian noise; wireless transmission, wireless sensor networks, numerical simulations, software defined radio
Year of publishing:2016
Publisher:[U. Pešović]
Source:Maribor
UDC:519.24:621.391.822(043.3)
COBISS_ID:19875862 Link is opened in a new window
NUK URN:URN:SI:UM:DK:VQOU5UB2
Views:1161
Downloads:66
Metadata:XML RDF-CHPDL DC-XML DC-RDF
Categories:KTFMB - FERI
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Secondary language

Language:Slovenian
Title:MODEL VERJETNOSTI POGREŠKOV IEEE 802.15.4 BREZŽIČNEGA PRENOSA PRI SO-KANALSKI INTERFERENCI IN ŠUMU OZADJA
Abstract:Prenos podatkov preko brezžičnega kanala je običajno podvržen šumu ozadja, izničevanju signala zaradi potovanja po več poteh in interference, kar povzroča pogreške prenosa podatkov. Vpliv takšnih motenj najpogosteje izražamo v obliki verjetnosti - statistike pogreškov. Učinek teh motenj na IEEE 802.15.4 brezžični prenos so preučevali predhodno, z izjemo vpliva so-kanalske interference CCI (ang. Co-Channel Interference), povzročene s trkom, zaradi dveh IEEE 802.15.4 naprav, ki izvajata sočasen radijski prenos podatkov. Naša teza predpostavlja, da je možno izpeljati bolj natančne analitične modele verjetnosti pogreškov za parametre verjetnosti pogreškov podatkov višjih nivojev, ne da bi idealizirali PN-razpršitveno sekvenco. Dodatno, teza je, da je možno izpeljati natančen analitični model pogreškov v primeru CCI s šumom v ozadju z opazovanjem zvezdnega konstelacijskega diagrama. IEEE 802.15.4 standard uporablja CSMA/CA mehanizem dostopa do prenosnega kanala, da bi preprečil trke med napravami, toda ta mehanizem ne zagotavlja zaščite pred problemom skritih vozlišč, ki so primarni izvor so-kanalske interference. Z uporabo Monte Carlo simulacij smo določili frekvenco trkov zaradi skritih vozlišč, pokazale so, da so-kanalska interferenca pogosto nastaja v delu omrežja, z velikim prometom. Nekaj predhodnih del na tem področju je težilo k idealizaciji te neidealne razpršilno sekvenco, da bi poenostavili izračun parametrov verjetnosti pogreškov. Naša doktorska teza predstavlja analitični model podatkovnega nivoja parametrov verjetnosti pogreškov (simbolov, bitov in paketov) za IEEE 802.15.4, ki uporablja originalno neidealno razpršilno sekvenco, brez idealizacij. Predlagani model verjetnosti je sestavljen iz medsebojno povezanih modelov verjetnosti pogreškov čipov, simbolov, bitov in paketov. Izpeljani modeli verjetnosti pogreškov so povezani tako, da vsak parameter verjetnosti pogreškov lahko določimo z uporabo parametra verjetnosti pogreška iz prejšnje stopnje. Model verjetnosti pogreškov IEEE 802.15.4 komunikacije lahko uporabimo v orodjih za simulacijo omrežij, da bi natančno simulirali energijsko učinkovite protokole dostopa do prenosnega medija v realističnih scenarijih. Predstavljene teoretične rezultate smo testirali z neodvisnimi numeričnimi simulacijami IEEE 802.15.4 prenosa po Monte Carlo metodi. Simulacijski rezultati so pokazali, da se izpeljani modeli parametrov pogreškov dobro ujemajo z dvema scenarijema s šumom v ozadju, z izničevanjem signala zaradi potovanja po več poteh in so-kanalske interference. Poleg tega smo natančnost izpeljanih matematičnih modela preverili z eksperimentom v realnem okolju, z uporabo z IEEE 802.15.4 skladnih oddajnikov /sprejemnikov za tvorjenje so-kanalske interference. Pakete smo sprejemali s programsko definirano radijsko platformo, ki je omogočala izdelavo koherentnega sprejemnika, v katerem smo lahko zajemali vso verjetnost - statistiko pogreškov. Rezultati eksperimenta so pokazali konsistentnost s predlaganimi analitičnimi modeli verjetnosti pogreškov, vendar so bila nekatera odstopanja, zaradi slabe sinhronizacije preambule pri nizkih vrednostih razmerja SNR. Tezo smo dokazali z Monte Carlo simulacijami fizičnega modela IEEE 802.15.4- komunikacije in eksperimentalnimi meritvami na realnem komunikacijskem sistemu.
Keywords:standard IEEE 802.15.4; model verjetnosti pogreškov; so-kanalska interferenca; Ricianov model kanala z več potmi; prištevajoči Gaussov beli šum; brezžični prenos; brezžična senzorska omrežja; programsko definiran radio


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