Link adaptation for wireless video communication systems

Abstract

This PhD thesis considers the performance evaluation and enhancement of video communication over wireless channels. The system model considers hybrid au- tomatic repeat request (HARQ) with Chase combining and turbo product codes (TPC). The thesis proposes algorithms and techniques to optimize the through- put, transmission power and complexity of HARQ-based wireless video communi- cation. A semi-analytical solution is developed to model the performance of delay- constrained HARQ systems. The semi-analytical and Monte Carlo simulation results reveal that signifcant complexity reduction can be achieved by noting that the cod- ing gain advantage of the soft over hard decoding is reduced when Chase combining is used, and it actually vanishes completely for particular codes. Moreover, the the- sis proposes a novel power optimization algorithm that achieves a significant power saving of up to 80%. Joint throughput maximization and complexity reduction is considered as well. A CRC (cyclic redundancy check)-free HARQ is proposed to improve the system throughput when short packets are transmitted. In addition, the computational complexity/delay is reduced when the packets transmitted are long. Finally, a content-aware and occupancy-based HARQ scheme is proposed to ensure minimum video quality distortion with continuous playback.

Date of Award	2014
Original language	American English
Supervisor	Arafat Aldweik (Supervisor) & Mohammed Al-Mualla (Supervisor)