Robust video transmission over space-time OFDM systems with scalable transcoding capacity

This paper proposed a novel scheme for robust video transmission in dispersive fading channels. A scalable MPEG-2 to H.264 transcoder is used to output H.264 FGS bitstream with reduced size of video frames. With the proposed system, the concurrent large diversity gain characteristic of space-time block codes (STBC) and alleviating the frequency-selective fading effect of OFDM can be achieved. The different bitstreams are given in different level protection by the system structure and channel coding according to the important level of scalable bitstream. The simulation results indicate that the proposed scheme integrating scalable transcoding can provide a basic quality of video transmission and outperforms the convention single layer transcoding transmitted under the random and bursty error channel conditions.