Efficient channel code rate selection algorithms for forward error correction of packetized multimedia bitstreams in varying channels

We study joint source-channel coding systems for the transmission of images over varying channels without feedback. We consider the situation where the channel statistics are unknown to the transmitter and focus on systems that enable good performance over a wide range of channel conditions. We firs...

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Bibliographic Details
Published in:IEEE transactions on multimedia 2004-04, Vol.6 (2), p.240-248
Main Authors: Stankovic, V., Hamzaoui, R., Zixiang Xiong
Format: Article
Language:English
Subjects:
Algorithms
Allocations
Channels
Coding
Concatenated codes
Convolutional codes
Cyclic redundancy check codes
Decoding
Error correction
Error correction & detection
Feedback
Forward error correction
Image coding
Multimedia
Statistics
Studies
Transmitters
Wavelet packets
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Summary:We study joint source-channel coding systems for the transmission of images over varying channels without feedback. We consider the situation where the channel statistics are unknown to the transmitter and focus on systems that enable good performance over a wide range of channel conditions. We first propose a linear-time channel code rate selection algorithm for a hybrid transmission system that combines packetization of an embedded wavelet bitstream into independently decodable packets and forward error correction with a concatenated cyclic redundancy check/rate-compatible punctured convolutional (RCPC) channel coder. We then consider an extension of this hybrid system with additional Reed-Solomon (RS) coding across the packets and give a linear-time algorithm for the efficient selection of both the RS and RCPC code rates. Experimental results for a wireline/wireless link modeled as the combination of a packet erasure channel and a Rayleigh flat-fading channel showed that our schemes significantly outperformed the best previous forward error correction systems in many situations where the actual channel parameter values deviated from the ones used in the optimization of the source-channel rate allocation.
ISSN:1520-9210
1941-0077
DOI:10.1109/TMM.2003.822789