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document.tex
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document.tex
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%%This is a very basic article template.
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%%There is just one section and two subsections.
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\documentclass[accentcolor=tud9c,10pt,nochapname]{tudexercise}
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\usepackage{mathtools}
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\DeclareMathSizes{10}{12}{8}{8}
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\begin{document}
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\title{Stochastische Signale und Systeme}
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\subtitle{Zusammenfassung Formeln}
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\author{Daniel Thiem}
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\maketitle
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\tableofcontents
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\numberwithin{equation}{section}
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\section{Kombinatorik \& reine Stochastik}
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\subsection{Wahrscheinlichkeitsdichtefunktion}
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\begin{equation}
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f(x) = P(X=x)
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\end{equation}
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\subsection{Verteilungsfunktion}
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\begin{equation}
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F(x) = P(X\leq x) = \int\limits_{-\infty}^x f(t)dt
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\end{equation}
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\subsection{Formel von Bayes}
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\begin{equation}
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P(A|B) = \frac{P(A \cap B)}{P(B)}
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\Rightarrow P(A_k|B) = \frac{P(A_k \cdot P(B|A_k))}{\sum\limits_{i=1}^n P(B|A_i) \cdot P(A_i)}
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\end{equation}
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\subsection{Erwartungswerte}
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\subsubsection{Allgmeine Erwartungswertberechnung}
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Sei $f(x)$ die Wahrscheinlichkeitsdichtefunktion von $X$
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\begin{equation}
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E(X) = \int\limits_{-\infty}^\infty x \cdot f(x) dx
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\end{equation}
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\subsubsection{Erweiterte Erwartungswertberechnung}
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Sei $Y=g(X)$ und $f(x)$ die Wahrscheinlichkeitsdichtefunktion von $X$
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\begin{equation}
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E[Y] = E[g(X)] = \int\limits_{-\infty}^\infty g(x) \cdot f(x) dx
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\end{equation}
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\subsubsection{Rechenregeln für Erwartungswerte}
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\begin{equation}
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E[A \cdot B] = E[A] \cdot E[B]
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\end{equation}4
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\begin{equation}
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E[aX +b] = aE[X] + b
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\end{equation}
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\subsection{Verteilungen}
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\subsubsection{Normalverteilung}
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\begin{equation}
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f(x) = \frac{1}{\sigma \sqrt{2 \pi}} e^{- \frac{1}{2} \left(\frac{t-\mu}{\sigma}\right)^2}
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\end{equation}
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\section{Prozesse}
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\subsection{Strikte Stationarität}
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\begin{equation}
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F_x(x_1,\dots ,x_N;n_1,\dots,n_N) = F_x(x_1,\dots ,x_N;n_1+n_0,\dots ,n_N+n_0) \quad \text{mit $N\rightarrow \infty$}
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\end{equation}
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\subsection{Second order moment function(SOMF)}
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\begin{equation}
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r_{XX}(n_1,n_2)=E[X(n_1)X(n_2)]
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\end{equation}
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\subsubsection{Stationär im weiteren Sinne}
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\begin{subequations}
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\begin{align}
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E[X(n)]&=\text{const.} \\
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r_{XX}(n_1,n_2) &= r_{XX}(\kappa) = E[X(n+\kappa)\cdot X(n)] \quad \text{mit} \quad \kappa = |n_2-n_1|
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\end{align}
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\end{subequations}
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\subsubsection{Eigenschaften der SOMF}
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\begin{subequations}
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\begin{align}
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r_{XX}(0) &= E[X(n)^2]=\sigma_X^2+\mu_x^2 \\
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r_{XX}(\kappa) &= r_{XX}(-\kappa) \\
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r_{XX}(0) &\geq|r_{XX}(\kappa)| \quad ,|\kappa|>0
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\end{align}
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\end{subequations}
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\subsection{Cross-SOMF}
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\begin{equation}
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r_{XY}(n_1,n_2) = E[X(n_1) \cdot Y(n_2)]
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\end{equation}
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\subsubsection{Gemeinsame Statonarität (joint stationary)}
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\begin{equation}
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r_{XY} = r_{XY}(n_1-n_2) = r_{XY}(\kappa) \quad\text{mit}\quad \kappa=n_1-n_2
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\end{equation}
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\subsubsection{Eigenschaften der Cross-SOMF}
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\begin{subequations}
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\begin{align}
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r_{XY}(-\kappa) &= r_{YX}(\kappa) \\
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|r_{XY}(\kappa)| &\leq \sqrt{r_{XX}(0) \cdot r_{YY}(0)} \\
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|r_{XY}(\kappa)| &\leq \frac{1}{2}(r_{XX}(0)+r_{YY}(0))
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\end{align}
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\end{subequations}
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\subsubsection{Unkorreliertheit (uncorrelated)}
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\begin{equation}
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r_{XY}(\kappa)=\mu_x \cdot \mu_y
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\end{equation}
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\subsubsection{Orthogonalität}
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\begin{equation}
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r_{XY}(\kappa)=0
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\end{equation}
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\end{document}
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