Iterative processing for improving decode quality in mobile multimedia communications

摘要

Multimedia communications over mobile net- works suffer fromfluctuating channel degradation. Conventional error handling schemesconsist of the first stage error correction decoding in wirelessinterface and the second stage error cor- rection decoding inmultimedia demultiplexer, where the second stage decoding result isnot used to improve the first stage de- coding performance. To meetthe requirements of more powerful error protection, we proposeiterative soft-input/soft-output er- ror correction decoding inmultimedia communication, where the likelihood output generated bythe error correction decoding in multimedia demultiplexer is fed backto the decoding in wireless interface and the decoding procedure isiterated. The perfor- mances were evaluated by MPEG-4 videotransmission simula- tion over mobilc channels.