${\displaystyle {\xrightarrow[{\text{Message}}]{W}}{\begin{array}{|c| }\hline {\text{Encoder}}\\f_{n}\\\hline \end{array}}{\xrightarrow[{\mathrm {Encoded \atop sequence} }]{X^{n}}}{\begin{array}{|c| }\hline {\text{Channel}}\\p(y|x)\\\hline \end{array}}{\xrightarrow[{\mathrm {Received \atop sequence} }]{Y^{n}}}{\begin{array}{|c| }\hline {\text{Decoder}}\\g_{n}\\\hline \end{array}}{\xrightarrow[{\mathrm {Estimated \atop message} }]{\hat {W}}}}$

In your article, replace the image with:

<math>\xrightarrow[\text{Message}]{W}
\begin{array}{ |c| }\hline \text{Encoder} \\ f_n \\ \hline\end{array}
\xrightarrow[\mathrm{Encoded \atop sequence}]{X^n}
\begin{array}{ |c| }\hline \text{Channel} \\ p(y|x) \\ \hline\end{array}
\xrightarrow[\mathrm{Received \atop sequence}]{Y^n}
\begin{array}{ |c| }\hline \text{Decoder} \\ g_n \\ \hline\end{array}
\xrightarrow[\mathrm{Estimated \atop message}]{\hat W}</math>

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