TY - GEN
T1 - A staggered FEC system for seamless handoff in wireless LANs
T2 - 9th IEEE International Symposium on Multimedia, ISM 2007
AU - Liu, Hang
AU - Wu, Mingquan
AU - Li, Dekai
AU - Mathur, Saurabh
AU - Ramaswamy, Kumar
AU - Han, Liqiao
AU - Raychaudhuri, Dipankar
PY - 2007/12/1
Y1 - 2007/12/1
N2 - We report the implementation experience and experimental evaluation of a staggered adaptive forward error correction (FEC) system for video multicast over wireless LANs. In the system, the parity packets generated by a cross-packet FEC code are transmitted at a time delay from the original video packets, i.e. staggercasting video stream and FEC stream in different multicast groups. The delay provides temporal diversity to improve the robustness of video multicast, especially to enable the clients to correct burst packet loss using FEC and to achieve seamless handoff. A wireless client dynamically joins the FEC multicast groups based upon its channel conditions and handoff events. We have implemented the system including the streaming server and client proxy. A novel software architecture is designed to integrate the FEC functionality in the clients without requirement for changing the existing video player software. We conduct extensive experiments to investigate the impact of FEC overhead and the delay between the video stream and FEC stream to the video quality under different interference levels and mobile handoff durations. The efficacy of staggered adaptive FEC system on improving video multicast quality is demonstrated in real system implementation.
AB - We report the implementation experience and experimental evaluation of a staggered adaptive forward error correction (FEC) system for video multicast over wireless LANs. In the system, the parity packets generated by a cross-packet FEC code are transmitted at a time delay from the original video packets, i.e. staggercasting video stream and FEC stream in different multicast groups. The delay provides temporal diversity to improve the robustness of video multicast, especially to enable the clients to correct burst packet loss using FEC and to achieve seamless handoff. A wireless client dynamically joins the FEC multicast groups based upon its channel conditions and handoff events. We have implemented the system including the streaming server and client proxy. A novel software architecture is designed to integrate the FEC functionality in the clients without requirement for changing the existing video player software. We conduct extensive experiments to investigate the impact of FEC overhead and the delay between the video stream and FEC stream to the video quality under different interference levels and mobile handoff durations. The efficacy of staggered adaptive FEC system on improving video multicast quality is demonstrated in real system implementation.
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U2 - 10.1109/ISM.2007.29
DO - 10.1109/ISM.2007.29
M3 - Conference contribution
AN - SCOPUS:48649091317
SN - 0769530583
SN - 9780769530581
T3 - Proceedings - 9th IEEE International Symposium on Multimedia, ISM 2007
SP - 283
EP - 290
BT - Proceedings - 9th IEEE International Symposium on Multimedia, ISM 2007
Y2 - 10 December 2007 through 12 December 2007
ER -