Iterative joint source-channel decoding of variable-length codes using residual source redundancy
2005 (English)In: IEEE Transactions on Wireless Communications, ISSN 1536-1276, E-ISSN 1558-2248, Vol. 4, no 3, 919-929 p.Article in journal (Refereed) Published
We present a novel symbol-based soft-input a posteriori probability (APP) decoder for packetized variable-length encoded source indexes transmitted over wireless channels where the residual redundancy after source encoding is exploited for error protection. In combination with a mean-square or maximum APP estimation of the reconstructed source data, the whole decoding process is close to optimal. Furthermore, solutions for the proposed APP decoder with reduced complexity are discussed and compared to the near-optimal solution. When, in addition, channel codes are employed for protecting the variable-length encoded data, an iterative source-channel decoder can be obtained in the same way as for serially concatenated codes, where the proposed APP source decoder then represents one of the two constituent decoders. The simulation results show that this iterative decoding technique leads to substantial error protection for variable-length encoded correlated source signals, especially, when they are transmitted over highly corrupted channels.
Place, publisher, year, edition, pages
2005. Vol. 4, no 3, 919-929 p.
iterative decoding, joint source-channel coding, residual source redundancy, variable-length codes (VLCs)
Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-14734DOI: 10.1109/TWC.2005.847032ISI: 000228937400014ScopusID: 2-s2.0-18844443456OAI: oai:DiVA.org:kth-14734DiVA: diva2:332775
QC 201005252010-08-052010-08-052016-05-23Bibliographically approved