## 2 Literature Review
Pros and cons of previous works have been compared in Table 1. In contrast to the previous works, this work combines mMIMO with OFDM and examines the prposed system performance using pictorial demonstration in addition to PSNR and SSIM. Furthermore, this work investigate the effect of modulation order, number of users, and OFDM transformer type on the performance of the proposed system. \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Ref.** & **Year** & **Main Focus of Previous Works** & **Limitation of Previous Works** & **Features of Our Study** \\ \hline
[30] & 2017 & \begin{tabular}{c} Image transmission through OFDM System under the Influence of AWGN channel. \\ \end{tabular} & \
\begin{tabular}{c} -Study image transmission using single antenna only. \\ -Study image transmission in AWGN only. \\ -Study not includes PSNR and SSIM. \\ \end{tabular} &
\begin{tabular}{c} -Study image transmission using massive MIMO combined with OFDM. \\ -Study image transmission in Rayleigh channel. \\ -Study image transmission using various transformers for OFDM. \\ -Study includes effect of number of users. \\ -Study includes PSNR and SSIM. \\ \end{tabular} \\ \hline
[25] & 2021 & \
\begin{tabular}{c} Performance evaluation of Image transmission through OFDM system using different SWK schemes under AWGN channel. \\ \end{tabular} &
\begin{tabular}{c} -Study image transmission using single antenna only. \\ -Study image transmission in AWGN only. \\ -Study not includes PSNR and SSIM. \\ \end{tabular} \\ \hline
[31] & 2020 & \
\begin{tabular}{c} Implementation of Image transmission system based OFDM using SDR for different PSK schemes. \\ \end{tabular} &
\begin{tabular}{c} -Implementation of Image transmission system using single antenna only. \\ -Study not includes PSNR and SSIM. \\ \end{tabular} \\ \hline
[32] & 2020 & \
\begin{tabular}{c} Study MSE and BER of Image transmission system based OFDM using different PSK schemes under AWGN channel. \\ \end{tabular} &
\begin{tabular}{c} -Study image transmission using single antenna only. \\ -Study more includes PSNR and SSIM. \\ \end{tabular} \\ \hline
[33] & 2020 & \
\begin{tabular}{c} Study MSE and BER of Image transmission system based OFDM using different PSK schemes under AWGN channel. \\ \end{tabular} &
\begin{tabular}{c} -Study image transmission using single antenna only. \\ -Study more includes PSNR and SSIM. \\ -Study not includes pictorial demonstration. \\ \end{tabular} \\ \hline
[33] & 2017 & \
\begin{tabular}{c} Image transmission through OFDM System under the Influence of Rayleigh channel. \\ \end{tabular} &
\begin{tabular}{c} -Study image transmission using single antenna only. \\ -Study not includes PSNR and SSIM. \\ \end{tabular} \\ \hline
[34] & 2019 & \
\begin{tabular}{c} Image transmission through OFDM System under the Influence of AWGN, Rayleigh, and \\ Rician channels. \\ \end{tabular} &
\begin{tabular}{c} -Study image transmission using single antenna only. \\ -Study not includes pictorial demonstration. \\ -Study not includes PSNR and SSIM. \\ \end{tabular} \\ \hline
[35] & 2018 & \
\begin{tabular}{c} Image transmission through OFDM System under the Influence of AWGN, Rayleigh, and \\ Rician channels. \\ \end{tabular} &
\begin{tabular}{c} -Study image transmission using single antenna only. \\ -Study not includes pistol demonstration. \\ -Study not includes PSNR and SSIM. \\ \end{tabular} \\ \hline
[35] & 2018 & \
\begin{tabular}{c} Image transmission through OFDM System over underwarding channels \\ \end{tabular} &
\begin{tabular}{c} -Study image transmission using single antenna only. \\ -Study not includes effect of modulation order. \\ -Study not includes SSIM. \\ -Study not includes SSIM. \\ \end{tabular} \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Comparison of our work with the previous works. \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Ref.