摘要
Recent years have witnessed an explosive growth in mobile video-based services and efficient and reliable video delivery draws more and more attention. As a type of rateless codes, fountain codes can automatically adapt to wireless channel conditions with- out any knowledge of channels. This paper provides an overview of several typical Foi-ward Error Correction （FEC） codes, such as Reed-Solomon （RS） code, Tornado code, Luby-Transform （LT） code, and Raptor code. We focus on a novel delay-aware fountain coding （DAF） technique that maxinfizes the code word length under the constraint of a given delay. Based on DAF, this paper also presents Unequal Error Protection DAF （UEP-DAF） which improves the Peak Signal to Noise Ratio （PSNR） without additional co- ordination between the encoder and the decoder, as well as Model Predictive Control DAF （MPC-DAF） which reduces the compu- tational complexity to an affordable level for real-time video comnmnications. Moreover, we review- video streaming technologies, then introduce Dynamic Adaptive Streaming over HTTP （DASH） and DASH over Multiple Content Distribution Servers （MCDS- DASH） in detail. Based on MCDS-DASH that adapts video bitrate at the block level to alleviate video fluctuation, we propose a novel approach to integrating fountain codes with MCDS-DASH, which is capable of achieving unprecedented high throughput.
Recent years have witnessed an explosive growth in mobile video-based services and efficient and reliable video delivery draws more and more attention. As a type of rateless codes, fountain codes can automatically adapt to wireless channel conditions with- out any knowledge of channels. This paper provides an overview of several typical Foi-ward Error Correction （FEC） codes, such as Reed-Solomon （RS） code, Tornado code, Luby-Transform （LT） code, and Raptor code. We focus on a novel delay-aware fountain coding （DAF） technique that maxinfizes the code word length under the constraint of a given delay. Based on DAF, this paper also presents Unequal Error Protection DAF （UEP-DAF） which improves the Peak Signal to Noise Ratio （PSNR） without additional co- ordination between the encoder and the decoder, as well as Model Predictive Control DAF （MPC-DAF） which reduces the compu- tational complexity to an affordable level for real-time video comnmnications. Moreover, we review- video streaming technologies, then introduce Dynamic Adaptive Streaming over HTTP （DASH） and DASH over Multiple Content Distribution Servers （MCDS- DASH） in detail. Based on MCDS-DASH that adapts video bitrate at the block level to alleviate video fluctuation, we propose a novel approach to integrating fountain codes with MCDS-DASH, which is capable of achieving unprecedented high throughput.
