\makeatletter
\newcommand{\figcaption}[1]{\def\@captype{figure}\caption{#1}}
\newcommand{\tblcaption}[1]{\def\@captype{table}\caption{#1}}
\makeatother

\begin{figure}[htb]
 \def\@captype{table}
 \begin{minipage}[c]{0.46\textwidth}
  \begin{center}
   \includegraphics[width=7cm]{figures/fg_3-3.eps}
   \caption{Pulse shape of a(t) and b(t).}
   \label{fig.3-3}
  \end{center}
 \end{minipage}
 \hfill
 %\begin{minipage}[t]{0.46\textwidth}
 \begin{minipage}[c]{0.46\textwidth}
  \begin{center}
    \begin{tabular}{|l|c|c|}
     \hline
     Module type&Nnoise&\textless NO\textgreater \\ \hline
     B3-B5&1500&1.5e-5\\ \hline
     B6&1541&2.1e-5\\ \hline
     Inners&1090&5.0e-9\\ \hline
     Middles&1557&2.7e-5\\ \hline
     Short-Middles&940&2.0e-9\\ \hline
     Outers&1618&3.5e-5\\ \hline
    \end{tabular}
  \end{center}
  \tblcaption{Default noise parameters}
  \label{noise}
 \end{minipage}
\end{figure}