Enhancement of adaptive FEC mechanism for video transmission over 802.11 WLANS

摘要

Forward Error Correction (FEC) techniques have been adopted with Automatic Repeat reQuest (ARQ) to overcome packet losses and avoid network congestion in various wireless network conditions. The number of FEC packets need to be generated adaptively because usually wireless network has varying network condition.In the current AdaptiveudFEC mechanism, the FEC packets are determined based on average queue length and average packet retransmission time. However, in order touddetermine average queue length, estimating its weight value (i.e. smoothing factor) is a challenging task. Smoothing factor is an important parameter as it affects the generation of FEC packets.Thus, this work conducted the estimation of suitable smoothing factor value to determine the average queue length according to packet loss rate over the wireless network.The simulation results show that the enhanced FEC mechanism outperformed other Adaptive FEC mechanisms in terms of recovery efficiency.