Simulation of adaptive FEC mechanism for streaming 3D models over wireless networks

In the article, we propose a adaptive FEC algorithm implemented in the Access Point (AP) to improve the quality of progressively compressed 3D models transmission over wireless networks(such as IEEE 802.11).Most FEC-based error control algorithms, which add redundant data to transmission data in a fixed number. However, most are unable to successfully hide the effects of burst losses (periods with high loss data rate).The number of redundant FEC data for the proposed method is determined by the AP, which is based on both channel bandwidth and end-to-end delay. The proposed algorithm is based on three factors. One of them is the queue length in the access point, indicating network traffic load; the second factor is the average packet error rate, burst length and density, indicating statistics on error patterns; the third factor is packet retransmission times, indicating wireless channel state. According to these factors, we present the unequal loss protection (ULP) framework in which unequal amounts of forward error correction are applied to progressive data to provide graceful degradation of 3D models quality as packet losses increase. Moreover, it would unnecessarily add more traffic to network in already congested scenario. Our work shows that the proposed method improves system performance by dynamically tuning FEC strength to the current loss in wireless channel. We use NS-2 (network simulation version 2) simulation experiments to prove our algorithm.