\begin{figure}
\centering
\includegraphics[width=1.1\textwidth]{1.jpg}
\caption{Sum-rates with respect to signal to noise ratio}
\end{figure}
\begin{figure}
\centering
\includegraphics[width=1.1\textwidth]{2.jpg}
\caption{Sum-rates with respect to signal to noise ratio}
\end{figure}