Abstract
Forward error correction (FEC) codes that can provide unequal error protection (UEP) have been used recently for video transmission over wireless channels. These video transmission schemes may also benefit from the use of FEC codes both at the application layer (AL) and the physical layer (PL). However, the interaction and optimal setup of UEP FEC codes at the AL and the PL have not been previously investigated. In this paper, we study the cross-layer design of FEC codes at both layers for H.264 video transmission over wireless channels. In our scheme, UEP Luby transform codes are employed at the AL and rate-compatible punctured convolutional codes at the PL. In the proposed scheme, video slices are first prioritized based on their contribution to video quality. Next, we investigate the four combinations of cross-layer FEC schemes at both layers and concurrently optimize their parameters to minimize the video distortion and maximize the peak signal-to-noise ratio. We evaluate the performance of these schemes on four test H.264 video streams and show the superiority of optimized cross-layer FEC design.
Highlights
Multimedia applications such as video streaming, which are delay sensitive and bandwidth intensive, are growing rapidly over wireless networks
3 Background we briefly review Luby transform (LT) and rate-compatible punctured convolutional (RCPC) Forward error correction (FEC) codes that will be used at the application layer (AL) and the physical layer (PL), respectively, in our proposed cross-layer FEC scheme
7 Conclusion Previously, equal error protection (EEP) and unequal error protection (UEP) FEC coding schemes have been used for video transmission over lossy channels
Summary
Multimedia applications such as video streaming, which are delay sensitive and bandwidth intensive, are growing rapidly over wireless networks. Luby et al [26] considered employing two layers of EEP FEC at the AL and the PL for MBMS download delivery in UMTS They investigated the trade-off between the AL FEC and PL FEC codes, and studied the advantages of the AL FEC on the system performance. The authors in [31] considered employing the Raptor codes at the AL to improve the quality of service for video in MBMS in long-term evolution (LTE) networks. They investigated the benefits of the AL FEC to multicast multimedia contents and examined how much FEC redundancy should be used under different packet loss patterns. We extend the results of [8] and consider the interaction of the AL coding with the PL coding in video transmission schemes
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