Cross layer 1, 2 and 5 resource allocation in uplink turbo-coded HARQ based OFDMA video transmission systems

Wang et al. propose the cross layer resource allocation algorithm considering channel state information in layer 1 and rate-distortion function in layer 5, for uplink convolutional coded OFDMA video transmission systems. In this paper, we propose the use of hybrid automatic repeat request protocol (HARQ) and the turbo code to improve Peak-Signal-to-Noise Ratio (PSNR, the measure of the video quality). We define this HARQ overhead consumption and adjust PSNR for HARQ redundancy. The simulation results show that, for the HARQ redundancy adjusted PSNR, the proposed turbo-coded HARQ scheme outperforms the proposed convolutional coded HARQ scheme and the convolutional coded no HARQ scheme in Wang et al. by 3.25, and 3.95 dB, respectively, when maximum two retransmissions are allowed for HARQ. The proposed turbo-coded HARQ scheme achieved maximum HARQ redundancy adjusted PSNR for just 2 retransmissions allowed; while the proposed convolutional coded HARQ scheme achieve maximum (but still lower than the proposed turbo-coded HARQ scheme) for 4 retransmissions allowed. Thus the proposed turbo-coded HARQ scheme has smaller delay than the proposed convolutional coded HARQ scheme.