Distributed source coding in wireless sensor networks using LDPC codes: a non-uniform framework

Summary form only given. First, we consider a system of two statistically dependent signals, X/sub 1/ and X/sub 2/. The correlation between signals X/sub 1/ and X/sub 2/ is modeled as the input and output of a binary symmetric channel with crossover probability. We propose a non-uniform LDPC code th...

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Vydáno v:Data Compression Conference s. 477
Hlavní autoři: Sartipi, M., Fekri, F.
Médium: Konferenční příspěvek
Jazyk:angličtina
Vydáno: IEEE 2005
Témata:
Computer networks
Convergence
Decoding
Degradation
Distributed computing
Intelligent networks
Parity check codes
Probability
Source coding
Wireless sensor networks
ISBN:0769523099, 9780769523095
ISSN:1068-0314
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Shrnutí:Summary form only given. First, we consider a system of two statistically dependent signals, X/sub 1/ and X/sub 2/. The correlation between signals X/sub 1/ and X/sub 2/ is modeled as the input and output of a binary symmetric channel with crossover probability. We propose a non-uniform LDPC code that considers the fact that different bits are subject to different sources of noise. Simulation results show that our proposed method improves the source coding performance considerably. We further study an extension of our approach to three correlated nodes. For simplicity, we consider the case that assumes that the sources are pairwise correlated with the same correlation probability. We show that this assumption cannot be generalized to more than three sources. In this case, a fourth source is not be a random variable and it can be identified by the first three sources.
ISBN:0769523099
9780769523095
ISSN:1068-0314
DOI:10.1109/DCC.2005.34