Soft source decoding with applications

Motivated by previous results in joint source-channel coding and decoding, we consider the problem of decoding of variable-length codes using soft channel values. We present results of decoding of selected codes using the maximum a posteriori (MAP) decoder and the sequential decoder, and show the pe...

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Vydané v:IEEE transactions on circuits and systems for video technology Ročník 11; číslo 10; s. 1108 - 1120
Hlavní autori: Bystrom, M., Kaiser, S., Kopansky, A.
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: New York, NY IEEE 01.10.2001
Institute of Electrical and Electronics Engineers
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Predmet:
Additive white noise
Applied sciences
Artificial intelligence
Channel coding
Channels
Code standards
Codes
Coding
Communication systems
Compressed
Computer science; control theory; systems
Decoders
Decoding
Error correction codes
Exact sciences and technology
Gain
Gaussian
Image processing
Information, signal and communications theory
MPEG 4 Standard
Pattern recognition. Digital image processing. Computational geometry
Performance gain
Redundancy
Serials
Signal processing
Source coding
Telecommunications and information theory
AWGN channels
Performance evaluation
Source coding
Redundancy
A posteriori estimation
Sequential decoding
Joint source channel coding
Variable length code
ISSN:1051-8215, 1558-2205
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Popis
Shrnutí:Motivated by previous results in joint source-channel coding and decoding, we consider the problem of decoding of variable-length codes using soft channel values. We present results of decoding of selected codes using the maximum a posteriori (MAP) decoder and the sequential decoder, and show the performance gains over decoding using hard decisions alone. The objective behind this work is to provide motivation for decoding of data compressed by standard source coding schemes, that is, to view the compressed bitstreams as being the output of variable-length coders and to make use of the redundancy in the bitstreams to assist in decoding. In order to illustrate the performance achievable by soft decoding, we provide results for decoding of MPEG-4 reversible variable-length codes as well as for decoding of MPEG-4 overhead information, under the assumption that this information is transmitted without channel coding over an additive white Gaussian noise channel. Finally, we present a method of unequal error protection for an MPEG-4 bitstream using the MAP and sequential source decoders, and show results comparable to those achievable by serial application of source and channel coding.
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ISSN:1051-8215
1558-2205
DOI:10.1109/76.954497