Energy Efficient Modulation Design with Unequal Error Protection for Multiresolution Image Transmission

Abstract

In this thesis, we propose first a new design for asymmetric M-ary QAM based on triangular QAM (TQAM) called asymmetric TQAM which provides considerable power gain over the asymmetric SQAM. In particular, information bits after source coding are grouped into bits according to their priority and then coded into asymmetric 64-TQAM in such a way that high priority (approximation) bits mapped onto 4-QAM have better protection from errors then the low priority (details) bits mapped onto “conventional” 16-TQAM. Then, performance analysis, in terms of power efficiency and Bit Error Rate (BER) of different UEP scenarios was carried out and presented in simulation results. Second, a scenario of image transmission is considered using the proposed asymmetric 64-TQAM. The results documenting the quality of the reconstructed images are obtained for different Signal to Noise Ratio (SNR) and the performance of the transmission system is analyzed in terms of Peak Signal to Noise Ratio (PSNR) of the received images. The results clearly show that the image transmission system using the UEP framework designed in this research outperforms the conventional and asymmetric SQAM in terms of PSNR