\documentclass[12pt,a4paper]{report}
\usepackage[top=3cm,right=3cm,bottom=2.5cm,left=2.5cm]{geometry}
\newcommand\persiangloss[2]{#1\dotfill\lr{#2}\\}
\newcommand\ekhtesaar[2]{\lr{#1}\dotfill\lr{#2}\\}
%تولید فهرست اختصارات
\usepackage{nomencl}
% \newcommand\persiangloss[1]{12\dotfill\lr{11}\\}
\makenomenclature \renewcommand{\nomname}{لیست نمادها} \usepackage{makeidx} %Package for indexing \makeindex
\pagestyle{myheadings}

\usepackage{xepersian}
\begin{document}

%\tableofcontents
\noindent
{\textbf{\huge{فهرست اختصارات}}} \\ \\

%فهرست اختصارات را به فهرست مطالب اضافه می کند
\addcontentsline{toc}{chapter}{فهرست اختصارات}
\ekhtesaar{Body Area Network}{BAN}
\ekhtesaar{Body Channel Communication}{BCC}
\ekhtesaar{Complementary Split Ring Resonators}{CSRRs}
\ekhtesaar{Dynamic Voltage Scaling}{DVS}
\ekhtesaar{Digital Television}{DTV}
\ekhtesaar{Energy Harvesting}{EH}
\ekhtesaar{Effective Isotropic Radiation Power}{EIRP}
\ekhtesaar{Front to Back Ratio}{FBR}
\ekhtesaar{Federal Communications Commission}{FCC}
\ekhtesaar{Harmonic Balance}{HB}
\ekhtesaar{High Impedance Surfaces}{HIS}

\end{document}