||Stankovic, V., Hamzaoui, R., Saupe, D.
||Influence of channel fluctuations on optimal real-time scalable image transmission
||Joint source-channel coding systems using scalable source codes
and forward error correction allow reliable transmission of multimedia
data over noisy channels. The performance of such systems
highly depends on the source-channel bit allocation strategy.
Rate-based error protection schemes, which maximize the
expected source rate are very attractive for real-time applications
because the optimization can be done very quickly and is independent
of the source. In real-world communication, channel conditions
are varying in time. Thus, it is important to frequently
update the error protection. For two state-of-the-art joint sourcechannel
coding systems, we show that a channel mismatch can
lead to a poor performance. We study theoretically and experimentally
the dependency of a rate-based optimal protection on the
channel statistics and provide an efficient strategy for adjusting the
error protection when a channel mismatch occurs.