A Theoretical Framework for Quality-Aware Cross-Layer Optimized Wireless Multimedia Communications
Figure 1
(a) Performance comparison using sample video clip: global cross-layer optimization
versus existing piecemeal cross-layer optimization. Here, assume that multihop
paths and their link quality can be found by a multihop routing protocol, such
as optimized link state routing protocol (OLSR) [52]. In this simulation, the
average link SNRs (in dB) of three multihop paths are , , and . Six AMC schemes as listed in [51] are adopted at the
PHY layer. At the receiver side, a simple error concealment algorithm is
adopted where the lost macroblock will be replaced by the latest correctly
received one. (b) Perceptual video quality comparison based on H.264 codec with
the same delay budget, where (a) is global
optimality and (b) is the best baseline.
