Elements of information theory
Elements of information theory
H.264 layered coded video over wireless networks: channel coding and modulation constraints
EURASIP Journal on Applied Signal Processing
Proceedings of the 14th ACM international conference on Mobile computing and networking
Cross-layer wireless bit rate adaptation
Proceedings of the ACM SIGCOMM 2009 conference on Data communication
SoftCast: one-size-fits-all wireless video
Proceedings of the ACM SIGCOMM 2010 conference
Hybrid digital-analog (HDA) joint source-channel codes for broadcasting and robust communications
IEEE Transactions on Information Theory
Hybrid Digital–Analog Source–Channel Coding for Bandwidth Compression/Expansion
IEEE Transactions on Information Theory
Distortion Bounds for Broadcasting With Bandwidth Expansion
IEEE Transactions on Information Theory
The source-channel separation theorem revisited
IEEE Transactions on Information Theory
Packet loss resilience of MPEG-2 scalable video coding algorithms
IEEE Transactions on Circuits and Systems for Video Technology
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Video broadcast and mobile video challenge the conventional wireless design. In broadcast and mobile scenarios the bit rate supported by the channel differs across receivers and varies quickly over time. The conventional design however forces the source to pick a single bit rate and degrades sharply when the channel cannot support the chosen bit rate. This paper presents SoftCast, a clean-slate design for wireless video where the source transmits one video stream that each receiver decodes to a video quality commensurate with its specific instantaneous channel quality. To do so, SoftCast ensures the samples of the digital video signal transmitted on the channel are linearly related to the pixels' luminance. Thus, when channel noise perturbs the transmitted signal samples, the perturbation naturally translates into approximation in the original video pixels. Hence, a receiver with a good channel (low noise) obtains a high fidelity video, and a receiver with a bad channel (high noise) obtains a low fidelity video.