Joint Source and Channel Decoding for Variable Length Encoded Turbo Codes

Joint source and channel decoding (JSCD) has been proved to be an effective technique which can improve decoding performance by exploiting residual source redundancy. Most previous publications on this subject focus on a traditional coding scheme in which the source variable-length coding (VLC) is s...

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Vydáno v:EURASIP journal on advances in signal processing Ročník 2008; číslo 1
Hlavní autoři: Liu, Jianjun, Tu, Guofang, Zhang, Can, Yang, Yang
Médium: Journal Article
Jazyk:angličtina
Vydáno: Cairo Hindawi Publishing Corporation 01.01.2008
SpringerOpen
Témata:
Applied sciences
Coding, codes
Exact sciences and technology
Information, signal and communications theory
Signal and communications theory
Telecommunications and information theory
Performance evaluation
Source coding
Redundancy
Iterative method
Turbo code
Concatenated codes
Algorithm
Joint source channel coding
Iterative decoding
Posterior probability
Simulation
Algorithm complexity
Variable length code
ISSN:1687-6180, 1687-6172, 1687-6180
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Popis
Shrnutí:Joint source and channel decoding (JSCD) has been proved to be an effective technique which can improve decoding performance by exploiting residual source redundancy. Most previous publications on this subject focus on a traditional coding scheme in which the source variable-length coding (VLC) is serially concatenated with a channel code. In this paper, a parallel concatenated coding scheme for the VLC combined with a turbo code is presented. By merging a symbol-level VLC trellis with a convolutional trellis, we construct a symbol-level joint trellis with compound states. Also, a solution of the symbol-by-symbol a posteriori probability (APP) decoding algorithm based on this joint trellis is derived, which leads to an iterative JSCD approach in the similar way to the classical turbo decoder. The simulation results show that our joint source-channel en/decoding system achieves some gains at the cost of increasing decoding complexity, when compared to the joint iterative decoding based on the bit-level super trellis for the separate coding system.
ISSN:1687-6180
1687-6172
1687-6180
DOI:10.1155/2008/149839