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Title: Cross Layer Techniques for Real-Time Video Communication over Wireless Networks
Author: Razavi, Rouzbeh
ISNI:       0000 0004 2669 7336
Awarding Body: University of ESSEX
Current Institution: University of Essex
Date of Award: 2008
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This thesis investigates various cross layer techniques for improving the performance of video communication over wireless networ~s. Since packet loss in wireless environments for video is a major issue, a considerable part of this research focuses on adaptation and optimization of various techniques to combat this problem. Specifically this research introduces novel ARQ techniques that account for the requirements of real-time video services. In addition, the thesis introduces a deadline aware buffering that can be combined with proposed ARQ schemes to improve the performance of the proposed algorithms. Since power consumption is another important factor in wireless networks, the proposed ARQ scheme is extended to improve the energy efficiency of the system. The performance of the proposed algorithms is further improved by unequal protection of packets based on their importance. In addition to ARQ, the possibility of using interleaved forward error correction . codes has been also investigated and an algorithm suitable for delay-sensitive video services is proposed. The algorithm is extended to consider the importance of the packets. Finally, modulation and coding assisted solution for various wireless technologies is investigated. Specifically, adaptive modulation is used to provide unequal protection of packets according to their content importance. In addition, it is shown that adaptive modulation can also be employed to improve delay performance, which is critical for delay-sensitive real-time video services.
Supervisor: Not available Sponsor: Not available
Qualification Name: Not available Qualification Level: Doctoral
EThOS ID:  DOI: Not available