## 5 Discussion  
An important robustness parameter is the number of frames transmitted without error, which directly reflects on the execution time and video quality. From the extracted SSIM/PSNR values, it is possible to calculate, for all the videos and defined scenarios, the proportional values of the number of transmitted frames without losses, and the mean values obtained are presented in Table 5. The frames lost during the transmission can result in visual artifacts such as blurs, jumps, or distortions in the image, as well as abrupt cuts in the audio and loss of synchronization between image and sound. These problems can impair the end user's QoE and compromise the understanding of the transmitted content. It becomes extremely important to maintain a stable and high-speed connection during the transmission and to use appropriate and up-to-date equipment. When we examine the values in Table 5, it becomes evident that BCH-LDPC with the QPSK modulation scheme presents better performance, obtaining values above 70% for most videos. Considering the number of frames transmitted without error, the mean values indicated in Tables 6 and 7 can be obtained. The results of the SSIM show that, for all the videos simulated in BCH-LDPC/64-QAM, the values are close to or higher than those simulated in RS-CONV/QPSK. This results in gains in SSIM values close to or  
Figure 6: SSIM x frames for Park over AWGN. Figure 7: SSIM x frames for Park over Rayleigh. above 78% on average for BCH-LDPC in relation to RS-CONV. As an additional metric, the PSNR reinforces the results found, exhibiting a similar behavior through which the BCH-LDPC method demonstrates greater gains as conditions become more severe and where the greatest gains are in Rayleigh/64-QAM. The values obtained indicate that, by using the BCH-LDPC/64-QAM system, it is possible to achieve video quality levels close to or higher than with RS-CONV/QPSK, thus enabling the use of videos in ultra resolution while maintaining acceptable quality levels. Thus, even in adverse channel conditions, the BCH-LDPC pair significantly improves the video quality delivered to the user. In addition, its proposal to meet the current demands of videos with increasingly high resolutions can be met satisfactorily, proving the importance of adopting BCH-LDPC in systems that use RS-CONV. An example is the Japanese standard ISDB-T. Such observations highlight the importance of the proposed methodology, which makes it possible to quantitatively define the average performance gain between DVB-T2/BCH-LDPC and DVB-T/RS-CONV systems in terms of objective metrics of video \begin{table}
\begin{tabular}{c c c c c c} \hline \hline  & \multicolumn{4}{c}{AWGN} \\ \hline  & Tree & Crowd & Cross & Duck & Park \\ \hline QPSK & 4.12\% & 9.78\% & 6.07\% & 12.47\% & 11.75\% \\ \hline
16-QAM & 6.31\% & 9.82\% & 7.58\% & 13.11\% & 13.38\% \\ \hline
64-QAM & 6.03\% & 11.93\% & 12.65\% & 14.57\% & 19.54\% \\ \hline  & \multicolumn{4}{c}{Rayleigh} \\ \hline  & Tree & Crowd & Cross & Duck & Park \\ \hline QPSK & 8.34\% & 18.79\% & 10.33\% & 14.75\% & 22.19\% \\ \hline
16-QAM & 14\% & 32.63\% & 12.82\% & 29.97\% & 31.15\% \\ \hline
64-QAM & 43.39\% & 35.42\% & 33.07\% & 47.85\% & 78.59\% \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Gain (%) in mean SSIM of BCH-LDPC in relation to RS-CONV.