Array with overlapping windows

LatexPro.tex

% https://www.overleaf.com/9963466dzbgyfnsjpmx#/36591581/           
\documentclass{article}
\usepackage{tikz}	
%%%<
\usepackage{verbatim}
\usepackage[active,tightpage]{preview}
\PreviewEnvironment{tikzpicture}
\setlength{\PreviewBorder}{10pt}%
\usetikzlibrary{patterns,decorations.pathreplacing}
\usetikzlibrary{snakes}

\begin{document}
\begin{tikzpicture}[set style={{help lines}+=[dashed]}]
%\draw[style=help lines] (0,0) grid +(12,12);


\draw                   (1,10) grid +(1,1);
\draw                   (2,10) grid +(1,1);
\draw                   (3,10) grid +(1,1); 
\draw                   (4,10) grid +(1,1); 
\draw                   (5,10) grid +(1,1); 
\draw                   (6,10) grid +(1,1); 
\draw                   (7,10) grid +(1,1); 
\draw                   (8,10) grid +(1,1); 
\draw                   (9,10) grid +(1,1); 
\draw                   (10,10) grid +(1,1); 

\node  at  (0.5,10.5) {$W_{i}$};
\node  at  (1.5,10.5) {$w_{1}$};
\node  at  (2.5,10.5) {$w_{2}$};
\node  at  (3.5,10.5) {$w_{3}$};
\node  at  (4.5,10.5) {$w_{4}$};

\node  at  (7.5,10.5) {...}; 

\node  at  (10.5,10.5) {$w_{N}$}; 

\node  at  (2,11.6) {$O_{(1,W_{i})}$};

\draw [
    snake=brace,
    segment amplitude=5pt,
    segment length=5pt
] (1,11.1) -- (3,11.1);

\node  at  (3,9.4) {$O_{(2,W_{i})}$};

\draw [
    snake=brace,
    segment amplitude=5pt,
    segment length=5pt
] (4,9.9) -- (2,9.9);

\node  at  (10,11.6) {$O_{(N,W_{i})}$};

\draw [
    snake=brace,
    segment amplitude=5pt,
    segment length=5pt
] (9,11.1) -- (11,11.1);


\draw                   (1,6) grid +(1,1);
\draw                   (2,6) grid +(1,1);
\draw                   (3,6) grid +(1,1); 
\draw                   (4,6) grid +(1,1); 
\draw                   (5,6) grid +(1,1); 
\draw                   (6,6) grid +(1,1); 
\draw                   (7,6) grid +(1,1); 
\draw                   (8,6) grid +(1,1); 
\draw                   (9,6) grid +(1,1); 
\draw                   (10,6) grid +(1,1); 



\node  at  (0.5,6.5) {$W_{i-1}$};
\node  at  (1.5,6.5) {$w_{1}$};
\node  at  (2.5,6.5) {$w_{2}$};
\node  at  (3.5,6.5) {$w_{3}$};
\node  at  (4.5,6.5) {$w_{4}$};

\node  at  (7.5,6.5) {...}; 

\node  at  (10.5,6.5) {$w_{N}$};

\node  at  (2,7.6) {$O_{(1,W_{i-1})}$};

\draw [
    snake=brace,
    segment amplitude=5pt,
    segment length=5pt
] (1,7.1) -- (3,7.1);

\node  at  (3,5.4) {$O_{(2,W_{i-1})}$};


\draw [
    snake=brace,
    segment amplitude=5pt,
    segment length=5pt
] (1,3.1) -- (3,3.1);

\node  at  (10,7.6) {$O_{(N,W_{i-1})}$};


\draw [
    snake=brace,
    segment amplitude=5pt,
    segment length=5pt
] (9,7.1) -- (11,7.1);


\draw                   (1,2) grid +(1,1);
\draw                   (2,2) grid +(1,1);
\draw                   (3,2) grid +(1,1); 
\draw                   (4,2) grid +(1,1); 
\draw                   (5,2) grid +(1,1); 
\draw                   (6,2) grid +(1,1); 
\draw                   (7,2) grid +(1,1); 
\draw                   (8,2) grid +(1,1); 
\draw                   (9,2) grid +(1,1); 
\draw                   (10,2) grid +(1,1); 


\node  at  (0.5,2.5) {$W_{i-2}$};
\node  at  (1.5,2.5) {$w_{1}$};
\node  at  (2.5,2.5) {$w_{2}$};
\node  at  (3.5,2.5) {$w_{3}$};
\node  at  (4.5,2.5) {$w_{4}$};

\node  at  (7.5,2.5) {...}; 

\node  at  (10.5,2.5) {$w_{N}$};

\node  at  (2,3.6) {$O_{(1,W_{i-2})}$};
\draw [
    snake=brace,
    segment amplitude=5pt,
    segment length=5pt
] (4,5.9) -- (2,5.9);

\node  at  (3,1.4) {$O_{(2,W_{i-2})}$};
\draw [
    snake=brace,
    segment amplitude=5pt,
    segment length=5pt
] (4,1.9) -- (2,1.9);

\node  at  (10,3.6) {$O_{(N,W_{i-2})}$};

\draw [
    snake=brace,
    segment amplitude=5pt,
    segment length=5pt
] (9,3.1) -- (11,3.1);

\end{tikzpicture}
\end{document}