We consider the scenario of using Automatic Repeat reQuest (ARQ) retransmission for two-way low-bit-rate video communications over wireless Rayleigh fading channels. A low-delay constraint may require that a corrupted retransmitted packet not be retransmitted again, thus there will be packet-errors at the decoder which results in video quality degradation. In this paper. We propose a scheme to improve the video quality. First, we propose a low-delay interleaving scheme that combines the interleaving memory with the video encoder buffer. Second, we propose a conditional retransmission strategy that reduces the number of retransmissions. Simulation results show that our proposed scheme can effectively reduce the number of packet errors and improve the channel utilization. As a result, we obtain PSNR (Peak Signal to Noise Ratio) improvement up to about 4 dB compared to H.263 TMN8.
['Supavadee Aramvith', 'Chia-Wen Lin', 'Sumit Roy 0001', 'Ming-Ting Sun']
Wireless video transport using conditional retransmission and low-delay interleaving