\documentclass[12pt,twoside]{report}
\usepackage{amsthm,amssymb,amsmath}
\usepackage{breqn}
\usepackage{xepersian}
\begin{document}
\begin{equation}
\begin{aligned}
\mathbf{z}(n)=\mathbf{u}(n) \mathbf{u}^{H}(n) \Bigr|\mathbf{u}^{H}(n) \mathbf{w}(n-1)\Bigl \vert^{p-2} 
\end{aligned}
\end{equation}
\end{document}