# Transmitter Diversity Gain Technique Aided Irregular Channel Coding for Mobile Video Transmission
## 6 Results and Discussion
### Subjective and Objective Performance Analysis
REP performs the same for all three partitions of type A, B, and C, due to the employment of the same Uni-code IRCC for all three types of partitions which has given the same level of protection to type A, B, and C partitions, as presented in Figure 6. More specifically, the priority of protection is higher for the type A partition in the IREP-1 scheme with the help of applying lower constituent code-rates subcodes when compared to partition type B and C of the same scheme, as can be confirmed from the BER performance curves that are shown in Figure 6. Similarly, for the IREP-2 scheme, the type B partition has better BER performance when compared to type A partition and type C partition, while partition C has a higher BER relative to partition A and it can be observed from the BER performance curves that are presented in Figure 6. The closer approximation of the EXIT chart demonstrates that a pinch-off achieved a lower \(E_{b}/N_{0}\) of 2 dB for IREP-1 and IREP-2 where the curves just intersect at less iterations and, consequently, results in a lower BER. At the right side of the EXIT chart, the intersection between the demapper and decoder transfer chart dominates the BER floor. It can be observed from the BER performance curves of Figure 6 that the IREP-1 and IREP-2 schemes have relatively better BER performance when compared to the REP scheme. This performance improvement for the IREP-1 and IREP-2 is owed to the provision of a wider open tunnel for the constituent inner and outer codes of the IREP-1 and IREP-2 schemes. In [30], the convergence behaviors of SECCs is analyzed with respect to the benchmark systems, while considering Single Input Single Output (SISO) transmission over Rayleigh channel. With reference to [30], our proposed system employs Irregular Convolutional Codes as a channel codes along with space-time codes for providing the diversity gain in the Multiple Input Multiple Output (MIMO) transmission mechanism. The focus of the proposed work is to achieve the performance gain by exploiting the irregular error protection capability of Irregular Convolutional Codes as channel codes and DSTS-SP for providing diversity gain and independence in the fading channel. With reference to [30], our proposed IREP-2 achieved a performance gain of 1.5 dB at the BER degradation point of 10-1. Figure 7 presents the PSNR Vs \(E_{b}/N_{0}\) performance curves of the proposed REP, IREP-1, and IREP-2 schemes. It can be observed in Figure 7 that IREP-1 provides the worst PSNR performance, while IREP-2 provides the best PSNR performance as compared to IREP-1 and the REP schemes. More specifically, it can be observed from Figure 7 that the IREP-2 scheme achieved a PSNR gain of 1 dB over the IREP-1 scheme and \(E_{b}/N_{0}\) a gain of 0.6 dB as compared to the REP scheme at the PSNR degradation point of 1 dB. Figure 8 presents the subjective analysis results for the employed REP, IREP-1, and IREP-2 schemes for the transmission of the conceded \"AKIYO\" video sequence, from left-to-right, respectively for REP, IREP-1, and IREP-2 schemes. As observed from Figure 7, the PSNR performance of the IREP-2 scheme is better when compared to IREP-1 and REP; its effectiveness is visualized in the perceptual quality of the \"AKIYO\" video sequence, as shown in Figure 8.  
Figure 6: Bit Error Rate (BER) Performance Curves of the proposed schemes with IREP-2 employing error protection order[B-A-C]. Figure 7: Peak Signal to Noise Ratio (PSNR) Performance Curves of the Coding Scheme.