In this diploma thesis, I developed algorithms to improve the throughput of data networks based on single-input single-output (SISO) and multiple-input multiple-output (MIMO) wireless links. The aim is to use the spectrum more efficiently and flexible, while providing the required reliability of the transmission and adaptation of network behavior. These techniques are based on theoretically optimal solutions maximizing the throughput and are too demanding to be used directly in the practice. Therefore, some simplifications are needed and I evaluated their impacts on the network performance.<br />The optimal solutions are originally designed for uncoded systems. To overcome this shortcoming in more practical applications, I created a framework for coded systems with bit error ratio and packet error ratio adaptation. In this framework, the type of coding can be easily replaced once the theoretical formulas for the new modulation and coding scheme are known. Similarly, the error distribution modeling used in the packet error ratio evaluation can be further improved. The performance of this approach is evaluated in a WiMAX simulator and compared to the achievable channel capacity as a reference.
en
dc.language
English
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dc.language.iso
en
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dc.rights.uri
http://rightsstatements.org/vocab/InC/1.0/
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dc.subject
WiMAX
de
dc.subject
OFDM Systeme
de
dc.subject
Leistung und Bit Loading
de
dc.subject
PER Adaptation
de
dc.subject
Greedy Algorithmus
de
dc.subject
MIMO
de
dc.subject
Kapazitat
de
dc.subject
WiMAX
en
dc.subject
OFDM Systems
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dc.subject
Power and bit loading
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dc.subject
PER adaptation
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dc.subject
Greedy algorithm
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dc.subject
MIMO
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dc.subject
Capacity
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dc.title
Channel adaptive OFDM systems with quantized feedback
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dc.type
Thesis
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dc.type
Hochschulschrift
de
dc.rights.license
In Copyright
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dc.rights.license
Urheberrechtsschutz
de
dc.contributor.affiliation
TU Wien, Österreich
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dc.rights.holder
Dagmar Bosanska
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tuw.version
vor
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tuw.thesisinformation
Technische Universität Wien
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dc.contributor.assistant
Mehlführer, Christian
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tuw.publication.orgunit
E389 - Institut für Nachrichtentechnik und Hochfrequenztechnik