A 2-level FEC mechanism joint with cross-layer superposition coded multicast for robust IPTV service over WiMAX

摘要

This paper proposes a framework with scalable video coding (SVD) at the source joint with a 2-level Forward Error Correction (FEC) at the channel and superposition modulation for efficient IPTV video multicasting over IEEE 802.16 (or WiMAX), called 2-level FEC joint with Multiple Description Coding (2FMDC). Multiple description coding (MDC) on SVD that generates multi-resolution of a video joint with superposition modulation (multi-resolution modulation) can overcome the channel diversity problem in wireless multicasting. In this framework, we use a 2-level FEC that enables a Subscriber Station (SS) to recover the lost frame and receive the video with more quality. The 2-level FEC denotes vertical FEC joint with horizontal FEC. Our proposed method applies identical redundancy compared with similar methods to the network traffic. Performance evaluation results demonstrate that using our proposed framework, an SS can achieve better video quality under multi-user channel diversity.