An optimized link adaptation scheme for efficient delivery of scalable H.264 Video over IEEE 802.11n

TitleAn optimized link adaptation scheme for efficient delivery of scalable H.264 Video over IEEE 802.11n
Publication TypeConference Paper
Year of Publication2008
AuthorsFallah, Y. P., H. Mansour, S. Khan, P. Nasiopoulos, and H. Alnuweiri
Conference NameCircuits and Systems, 2008. ISCAS 2008. IEEE International Symposium on
Pagination2058 -2061
Date Publishedmay.
Keywordscoding parameter, cross-layer optimization, IEEE 802. 11n, link adaptation, physical layer modulation, scalable H.264 video, scalable video distortion estimation, scalable video streaming, temporal fairness criterion, video coding, video streaming, wireless LAN, wireless local area networks, WLAN

In this paper, we propose a cross-layer optimization scheme for delivery of scalable video over variable bit-rate wireless networks, in particular 802.11 based wireless local area networks (WLAN). For scalable video streaming applications, the conventional solution to reduced throughput due to channel distortions is to reduce the video bitrate by dropping the higher enhancement layers of the scalable video. We show that video quality can be improved, without adding to traffic load, when the WLAN link adaptation scheme uses a temporal fairness criterion along with scalable video distortion estimates to adjust its physical (PHY) layer modulation and coding parameters used for delivering each video layer. We formulate the problem as an optimization problem for assigning different PHY modes to different layers of scalable video under temporal fairness constrains; the solution to this problem provides a set of PHY configuration parameters that achieve the highest possible video quality while meeting the admission control constraints. Performance evaluations demonstrate the effectiveness of our method and the accuracy of the models.


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