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Master-Vortrag: Flexible Error Protection for Scalable Video Streams Using Digital Fountain Codes
Radu Lupoaie
24. Oktober 2011
11:00 Uhr
Hörsaal 4G IKS
The first part of this Master thesis is dedicated to presenting features of Scalable Video Coding (SVC) in order to explain the required types of error correction schemes. One of the main topics of this thesis is the definition and analysis of an application layer forward error correction (AL-FEC) scheme which applies better to the characteristics of an SVC bitstream.
In the subsequent part the first main topic of the thesis is presented. The general concepts behind digital fountain codes are first explained. Then, an extensive comparison is carried out between the performance of the codes when encoding and decoding are performed in the binary domain or over higher order Galois fields. Literature on this topic already exists, in which performance comparisons are presented. Nevertheless, new aspects are also taken into consideration, such as a fairer performance comparison in terms of erasure correction properties, an arithmetic complexity analysis regarding encoding and decoding and a required memory comparison.
In the third part the second main topic of the thesis is discussed, namely a new means of obtaining unequal error protection with digital fountain codes is presented and examined. These codes, called Generalised Digital Fountain Codes (GDFC), are defined and, in order to quantify their performance, theoretical upper and lower bounds on their erasure correction capabilities are derived. Using these bounds, different optimisations are conducted and the performance of the codes is analysed when different transmission requirements are considered.
Finally, three SVC transmission scenarios employing the GDFCs are examined in order to demonstrate the benefits of applying GDFCs over using digital fountain codes which offer equal error protection.
