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latex/thesis/chapters/acknowledgements.tex
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latex/thesis/chapters/acknowledgements.tex
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\chapter*{Acknowledgements}
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I would like to thank Prof. Dr.-Ing. Laurent Schmalen for granting me the
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opportunity to write my bachelor's thesis at the Communications Engineering Lab,
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as well as all other members of the institute for their help and many productive
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discussions, and for creating a very pleasant environment to do research in.
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I am very grateful to Dr.-Ing. Holger Jäkel
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for kindly providing me with his knowledge and many suggestions,
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and for his constructive criticism during the preparation of this work.
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Special thanks also to Mai Anh Vu for her invaluable feedback and support
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during the entire undertaking that is this thesis.
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Finally, I would like to thank my family, who have enabled me to pursue my
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studies in a field I thoroughly enjoy and who have supported me completely
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throughout my journey.
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@ -27,12 +27,13 @@ of the \ac{MAP} decoding problem \cite{proximal_paper}.
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The motivation behind applying optimization methods to channel decoding is to
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The motivation behind applying optimization methods to channel decoding is to
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utilize existing techniques in the broad field of optimization theory, as well
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utilize existing techniques in the broad field of optimization theory, as well
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as find new decoding methods not suffering from the same disadvantages or exhibiting
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as find new decoding methods not suffering from the same disadvantages as
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other desirable properties.
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existing message passing based approaches, or exhibiting other desirable properties.
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\Ac{LP} decoding, for example, comes with strong theoretical guarantees
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\Ac{LP} decoding, for example, comes with strong theoretical guarantees
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allowing it to be used as a way of closely approximating \ac{ML} decoding,
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allowing it to be used as a way of closely approximating \ac{ML} decoding
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\cite[Sec. I]{original_admm},
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and proximal decoding is applicable to non-trivial channel models such
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and proximal decoding is applicable to non-trivial channel models such
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as \ac{LDPC}-coded massive \ac{MIMO} channels.
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as \ac{LDPC}-coded massive \ac{MIMO} channels \cite{proximal_paper}.
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This thesis aims to further the analysis of optimization based decoding
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This thesis aims to further the analysis of optimization based decoding
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algorithms as well as verify and complement the considerations present in
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algorithms as well as verify and complement the considerations present in
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@ -179,9 +179,9 @@ codewords:
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&= \argmax_{c\in\mathcal{C}} \frac{f_{\boldsymbol{Y} \mid \boldsymbol{C}}
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&= \argmax_{c\in\mathcal{C}} \frac{f_{\boldsymbol{Y} \mid \boldsymbol{C}}
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\left( \boldsymbol{y} \mid \boldsymbol{c} \right) p_{\boldsymbol{C}}
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\left( \boldsymbol{y} \mid \boldsymbol{c} \right) p_{\boldsymbol{C}}
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\left( \boldsymbol{c} \right)}{f_{\boldsymbol{Y}}\left( \boldsymbol{y} \right) } \\
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\left( \boldsymbol{c} \right)}{f_{\boldsymbol{Y}}\left( \boldsymbol{y} \right) } \\
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&= \argmax_{c\in\mathcal{C}} f_{\boldsymbol{Y} \mid \boldsymbol{C}}
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% &= \argmax_{c\in\mathcal{C}} f_{\boldsymbol{Y} \mid \boldsymbol{C}}
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\left( \boldsymbol{y} \mid \boldsymbol{c} \right) p_{\boldsymbol{C}}
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% \left( \boldsymbol{y} \mid \boldsymbol{c} \right) p_{\boldsymbol{C}}
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\left( \boldsymbol{c} \right) \\
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% \left( \boldsymbol{c} \right) \\
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&= \argmax_{c\in\mathcal{C}}f_{\boldsymbol{Y} \mid \boldsymbol{C}}
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&= \argmax_{c\in\mathcal{C}}f_{\boldsymbol{Y} \mid \boldsymbol{C}}
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\left( \boldsymbol{y} \mid \boldsymbol{c} \right)
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\left( \boldsymbol{y} \mid \boldsymbol{c} \right)
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.\end{align*}
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.\end{align*}
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@ -342,7 +342,7 @@ In contrast to the established message-passing decoding algorithms,
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the perspective then changes from observing the decoding process in its
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the perspective then changes from observing the decoding process in its
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Tanner graph representation with \acp{VN} and \acp{CN} (as shown in figure \ref{fig:dec:tanner})
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Tanner graph representation with \acp{VN} and \acp{CN} (as shown in figure \ref{fig:dec:tanner})
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to a spatial representation (figure \ref{fig:dec:spatial}),
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to a spatial representation (figure \ref{fig:dec:spatial}),
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where the codewords are some of the edges of a hypercube.
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where the codewords are some of the vertices of a hypercube.
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The goal is to find the point $\tilde{\boldsymbol{c}}$,
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The goal is to find the point $\tilde{\boldsymbol{c}}$,
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which minimizes the objective function $g$.
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which minimizes the objective function $g$.
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@ -35,7 +35,7 @@
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\usetikzlibrary{spy}
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\usetikzlibrary{spy}
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\usetikzlibrary{shapes.geometric}
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\usetikzlibrary{shapes.geometric}
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\usetikzlibrary{arrows.meta,arrows}
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\usetikzlibrary{arrows.meta,arrows}
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\tikzset{>=stealth}
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\tikzset{>=latex}
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\pgfplotsset{compat=newest}
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\pgfplotsset{compat=newest}
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\usepgfplotslibrary{colorbrewer}
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\usepgfplotslibrary{colorbrewer}
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@ -210,6 +210,7 @@
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%
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%
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% 6. Conclusion
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% 6. Conclusion
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\include{chapters/acknowledgements}
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\tableofcontents
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\tableofcontents
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\cleardoublepage % make sure multipage TOCs are numbered correctly
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\cleardoublepage % make sure multipage TOCs are numbered correctly
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