A Cross-Layer Design for Scalable Mobile Video
Name
Katabi_A cross-layer design.pdf
Size
625.14 KB
Format
Adobe PDF
Checksum (MD5)
023c891f32f91cac61f50a5cced05de6
Author(s)
Jakubczak, Szymon Kazimierz
Katabi, Dina
Date Issued
September 2011
Journal
Proceedings of the 17th annual international conference on Mobile computing and networking (MobiCom '11 )
Publisher
Association for Computing Machinery (ACM)
Citation
Jakubczak, Szymon, and Dina Katabi. “A Cross-layer Design for Scalable Mobile Video.” ACM Press, 2011. 289.
Version
Author's final manuscript
Abstract
Today's mobile video suffers from two limitations: 1) it cannot reduce bandwidth consumption by leveraging wireless broadcast to multicast popular content to interested receivers, and 2) it lacks robustness to wireless interference and errors. This paper presents SoftCast, a cross-layer design for mobile video that addresses both limitations. To do so, SoftCast changes the network stack to act like a linear transform. As a result, the transmitted video signal becomes linearly related to the pixels' luminance. Thus, when noise perturbs the transmitted signal samples, the perturbation naturally translates into approximation in the original video pixels. This enables a video source to multicast a single stream that each receiver decodes to a video quality commensurate with its channel quality. It also increases robustness to interference and errors which now reduce the sharpness of the received pixels but do not cause the video to glitch or stall. We have implemented SoftCast and evaluated it in a testbed of software radios. Our results show that it improves the average video quality for multicast users by 5.5dB, eliminates video glitches caused by mobility, and increases robustness to packet loss by an order of magnitude.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Terms of Use
Creative Commons Attribution-Noncommercial-Share Alike 3.0
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1145/2030613.2030646
