Robust video broadcasting over 802.11a/g in time-correlated fading channels

In order to deliver video streams efficiently over WiFi to many thousands of consumer handheld devices, broadcast protocols must be employed. In this mode of operation the received video quality can deteriorate rapidly as a result of high application layer packet loss which occurs because MAC frame...

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Bibliographic Details
Published in:IEEE transactions on consumer electronics 2009-02, Vol.55 (1), p.69-76
Main Authors: Sgardoni, V., Sarafianou, M., Ferre, P., Nix, A., Bull, D.
Format: Article
Language:English
Subjects:
broadcast
Broadcasting
Channels
Delay
Deterioration
Electronics
Error correction
Fading
Forward error correction
Handheld computers
IEEE
interleaving
Multimedia communication
Protocols
Robustness
Streaming media
Terminals
Video sequences
WLAN
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Summary:In order to deliver video streams efficiently over WiFi to many thousands of consumer handheld devices, broadcast protocols must be employed. In this mode of operation the received video quality can deteriorate rapidly as a result of high application layer packet loss which occurs because MAC frame retransmission cannot be used. In this paper we develop a robust video delivery solution for broadcast transmission over 802.11a/g. Using a cross-layer WiFi simulator in combination with an accurate time-correlated fading channel, the received video quality is evaluated for broadcast H.264 video sequences. Application layer cross-packet forward error correction is then used together with error concealment at the video client. Furthermore, the application of an external packet interleaver is considered. Combining a block size of two hundred packets (which introduces a 4.8 second delay) and an application layer FEC code rate of 0.75 our results demonstrate that video can be successfully broadcast over WiFi to many thousands of handheld terminals at large-scale spectator events.
ISSN:0098-3063
1558-4127
DOI:10.1109/TCE.2009.4814416