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Mo, Yilin edited appendix.tex
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\begin{enumerate}
\item $D$ and $\hat D$ are block diagonal and positive definite matrices; \item both $\mC$ and $\hat \mC$ are stable and minimum phase,
\end{enumerate}
then there exists a paraunitary matrix $\mathcal V(z)$ such that
\cite{anderson3} \cite{Anderson_1982}
\begin{align}
\hat \mC(z)=\mC(z)\mathcal V(z),\label{eq:c1c2}\\
\hat D= \mathcal V(z) D\mathcal V^*(z).\label{eq:q1q2}
\end{align}
From \eqref{eq:c1c2}, since both $\mC(z)$ and $\hat \mC(z)$ are stable and minimum phase, $\mathcal V(z)$ is stable and minimum phase, which implies that $\mathcal V(z)$ is a constant matrix independent of $z$
\cite{anderson, hayden}. \cite{Anderson_1969, Hayden_2014}. Therefore, we denote it simply as $V$. Take $z\rightarrow\infty$ on both sides of \eqref{eq:c1c2} yields
\begin{equation}
\begin{bmatrix}
0 & I \\