Patent ID: 9131238
Filing Date: 2015-09-08
Classification: H04N

Abstract:
1. A digital multicast system including a source channel encoder configured to multicast a digital multimedia source to a plurality of remote terminals each having a source channel decoder, the system comprising: the source channel encoder comprising: a linear transform encoder configured to generate a plurality of source components; a successive refinement quantizer configured to generate a plurality of bit planes based on the source components (for each), wherein the linear transform encoder and the successive refinement quantizer are optimized for the digital multimedia source; and a systematic linear encoder configured to map the bit planes into channel-encoded symbols configured for multicasting to the plurality of remote terminals; the source channel decoder comprising: a plurality of Belief Propagation (BP) decoders configured for successive decoding of the channel-encoded symbols, each BP decoder being associated with a single bit plane and being configured to generate a soft estimate of the bit plane based on an a-posteriori Log-Likelihood Ratio (LLR); and a reconstruction engine configured to produce an estimate of a source sample based on the a-posteriori LRRs generated by the BP decoders using minimum mean-square error (MMSE) criterion.