When transmitting multimedia applications over a wireless channel, multimedia traffic is faced with the error-prone, time-varying nature of wireless communication. One means to improve this situation is to adapt the transmission decisions, e.g., time to transmit or parameters like transmission power or FEC to the current, actual state of the wireless channel. Also, semantic-aware adaptation techniques have proven to achieve important quality gains. However, these approaches require modifications to existing applications. This paper investigates how the combination of channel knowledge with different deadlines impacts the perceived quality of voice over IP and MPEG4 encoded video streams.
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