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Prioritized transmission of data partitioned H.264 video with hierarchical QAM

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4 Author(s)
Barmada, B. ; Electron. Syst. Eng. Dept., Univ. of Essex, Colchester, UK ; Ghandi, M.M. ; Jones, E.V. ; Ghanbari, M.

In this letter, hierarchical quadrature amplitude modulation (HQAM) is used to provide unequal error protection (UEP) for layered (data partitioned) H.264 coded video. In a conventional HQAM system, the high-priority (HP) and low-priority (LP) capacities have a constant ratio, whereas in H.264 data partitioning, the corresponding parts do not necessarily have this constant ratio. This letter proposes a multilevel HQAM arrangement with adaptive constellation distances that provides a graceful degradation in the quality of the decoded video without requiring feedback from the receiver. The arrangement improves the quality relative to nonhierarchical transmission through poor signal-to-noise ratio (SNR) channels at the price of a modest quality reduction through good SNR channels.

Published in:

Signal Processing Letters, IEEE  (Volume:12 ,  Issue: 8 )