A forward error recovery technique for real-time MPEG-2 video transport and its performance over wireless IEEE 802.11 LAN

In this work, we consider the MPEG-2 system streams: elementary stream (ES) packetised elemenMPEG-2 PES has a variable length (in terms of bits), Real-time MPEG-2 video transport applications do not tary stream (PES) and ering from any errors that might occur during cornTS has fixed length. These streams are munication. Degradation in quality of decoded video stream (TS). usually have the luxury of reverse channel for recovin such that PES headers always Occur at the start of a the TS packets. This is done to help the video decoder frames 'is immediately apparent in the presence of erto easily synchronize on the PES header. Due to the rors in headers. In this paper, we focus on protecting that might be available in the defined MPEG-2 narispletely filled with PES information. Our approach is to use this space that might be available in a TS packet to port Stream packets. We also present our implementation experience Over wired ATM as well as wireless duplicate the header information, to facilitate forward header information by replicating them in free space fixed size Of TS Packets, Some Of them not be 'OmIEEE 802.11 LAN by incorporating this forward error recovery approach with a real-time MPEG-2 encoder, our experiements, it is found that the free space error recovery Of real-time MPEG-2 video. We also present the of this approach and its Performance during real-time MPEG-2 transport Over wired ATM and wireless IEEE 802.11 LAN. available is generally more than adequate for replicating essential header information. 2 The Forward Error Recovery