Impact of Weight Values in Hybrid and Adaptive FEC Mechanism over Wireless Network

Abstract

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. Two factors have been used which are queue length and packet retransmission times. According to these two factors, two different weight values are used to generate consistence and smooth value of queue length and packet retransmission times. Firstly, qweight is calculated with current queue length to generate average queue length. Secondly, sweight is calculated with current packet retransmission times to determine average packet retransmission times. Thus, this paper presents the experiments to investigate the reasonable qweight and sweight values, in order to determine the appropriate average number of these two parameters. The results show when the value of qweight and sweight is 0.1, high number of FEC packets and high value of Peak Signal Noise Ratio (PSNR) is generated. When the experiment is run with different values of qweight and static sweight, the result shows that smaller value of qweight is better in order to produce best quality of video.