Joint Optimization of Iterative Source and Channel Decoding Using Over-Complete Source-Mapping

— The intentionally imposed or inherent unintentional residual redundancy found in source encoded bitstreams can be exploited for supporting joint SoftBit-Source Decoding and Channel Decoding, which has the potential of improving both the error correcting capability as well as the subjective audio or video quality of communication systems. As a potent error concealment technique, the softbit-based source decoding, proposed by Adrat, Vary and Spittka exploits the residual redundancy or correlation inherent in the source codec parameters for mitigating the effects of transmission errors. However, when using efficient source encoders, limited source redundancy is left in the sourceencoded bitstream. In this scenario the SoftBit-Source Decoder (SBSD) may have a limited extrinsic information contribution, which results in no system performance improvements beyond two decoding iterations. In our novel approach, we partition the total available bit-rate budget between the source and channe...

• Type: Conference
• Year: 2007
• Where: VTC
• Authors: Anh Quang Pham, Lie-Liang Yang, Lajos Hanzo
• Keywords: Error Correcting Capability, Residual Redundancy, Unintentional Residual Redundancy, VTC 2007