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Author:Jäämaa, Juha
Title:Kanavamallien vertailu LTE-järjestelmissä
Channel Model Comparison in LTE systems
Publication type:Master's thesis
Publication year:2010
Pages:[10] + 70      Language:   fin
Department/School:Tietoliikenne- ja tietoverkkotekniikan laitos
Main subject:Tietoliikennetekniikka   (S-72)
Supervisor:Tirkkonen, Olav
Instructor:Ruttik, Kalle
Electronic version URL: http://urn.fi/URN:NBN:fi:aalto-201203131471
OEVS:
Electronic archive copy is available via Aalto Thesis Database.
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Location:P1 Ark Aalto  818   | Archive
Keywords:channel
spatial channel model
delay line channel model
Alamouti scheme
closed-loop precoding
codebook
BER
SNR Gain
kanava
tilallinen kanavamalli
viivelinjakanavamalli
Alamoutin menetelmä
takaisinkytketty esikoodaus
koodikirja
BER
SNR-vahvistus
Abstract (eng): The aim of this work is to compare the spatial channel model and its behaviour to the simpler tapped delay-line channel models.
We study the impact of the used transmission systems and precoding to the results.
The comparison is realized with Matlab simulations.

The simulations are performed with two LTE systems.
In the first system the Alamouti scheme is used.
The second system performs with the closed-loop precoding.
We use two delay-line channel models: with fixed correlation amplitude and with fixed correlation matrix.

We can see from the simulation results that the used channel models will not cause any changes to the performance between the transmission systems.
The delay-line channel models perform better with big per bit signal-to-noise ratio than the spatial channel model.

The performance of the channel models with fixed correlation matrix and with fixed correlation amplitude varies by the used codebook.
The latter model outputs more realistic results.
Abstract (fin): Tämän työn tarkoituksena on verrata tilallista kanavamallia ja sen käyttäytymistä yksinkertaisempiin tapillisena viivelinjana toteutettuihin kanavamalleihin.
Tutkimme mikä vaikutus käytettävillä siirtojärjestelmillä ja esikoodauksella on tuloksiin.
Vertailu tapahtuu Matlab-simulointien avulla.

Simuloinnit suoritetaan kahdessa LTE-järjestelmässä.
Järjestelmissä käytetään toisessa Alamoutin menetelmä ja toisessa takaisinkytkettyä esikoodausta.
Viivelinjakanavamalleista käytämme kiinteällä korrelaatioamplitudilla toteutettua mallia sekä kiinteällä korrelaatiomatriisilla toteutettua mallia.

Simulointituloksista näemme, että käytetyt kanavamallit eivät aiheuta muutoksia siirtojärjestelmien väliseen suorituskykyyn.
Viivelinjakanavamallien suorituskyky suurilla bittikohtaisen signaali-kohinasuhteen arvoilla on parempi kuin tilallisella kanavamallilla.

Kiinteällä korrelaatiomatriisilla sekä kiinteällä korrelaatioamplitudilla toteutettujen kanavamallien suorituskyky vaihtelee käytetyn koodikirjan perusteella.
Jälkimmäinen malli tuottaa realistisempia tuloksia.
ED:2010-08-17
INSSI record number: 40117
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