Signal superposition multiplexing for scalable video transmission

In this paper, we propose a signal superposition layer multiplexing for the scalable video codec (SVC) coded video wireless broadcasting system. The SVC coded video layers are grouped into various groups and each group is encoded independently into a signal layer. The various signal layers are multiplexed using signal superposition and then transmitted. We introduce successive group decoder, originally used for interference channels, to decode the multiple signal layers from the received superimposed signals. Based on the optimal decoding order of the successive group decoder, we propose the signal layer allocation which guarantees that each receiver first decodes the signal layer encoded from the SVC base layer and then decodes those encoded from the SVC enhancement layers. From simulation results, the signal superposition SVC layer multiplexing shows significant peak signal-noise-ratio (PSNR) improvement for the reconstructed video, compared with the orthogonal channel SVC layer multiplexing, e.g., the time division multiple access (TDMA).