Campus Units

Electrical and Computer Engineering

Document Type

Conference Proceeding

Conference

2011 IEEE International Symposium on Information Theory

Publication Version

Accepted Manuscript

Link to Published Version

https://doi.org/10.1109/ISIT.2011.6033873

Publication Date

2011

Journal or Book Title

2011 IEEE International Symposium on Information Theory Proceedings (ISIT)

DOI

10.1109/ISIT.2011.6033873

Conference Title

2011 IEEE International Symposium on Information Theory

Conference Date

July 31-August 5, 2011

City

St. Petersburg, Russia

Abstract

Practical constructions of lossless distributed source codes (for the Slepian-Wolf problem) have been the subject of much investigation in the past decade. In particular, near-capacity achieving code designs based on LDPC codes have been presented for the case of two binary sources, with a binary-symmetric correlation. However, constructing practical codes for the case of non-binary sources with arbitrary correlation remains by and large open. From a practical perspective it is also interesting to consider coding schemes whose performance remains robust to uncertainties in the joint distribution of the sources. In this work we propose the usage of Reed-Solomon (RS) codes for the asymmetric version of this problem. We show that algebraic soft-decision decoding of RS codes can be used effectively under certain correlation structures. In addition, RS codes offer natural rate adaptivity and performance that remains constant across a family of correlation structures with the same conditional entropy. The performance of RS codes is compared with dedicated and rate adaptive multistage LDPC codes (Varodayan et al. '06), where each LDPC code is used to compress the individual bit planes. Our simulations show that in classical Slepian-Wolf scenario, RS codes outperform both dedicated and rate-adaptive LDPC codes under q-ary symmetric correlation, and are better than rate-adaptive LDPC codes in the case of sparse correlation models, where the conditional distribution of the sources has only a few dominant entries. In a feedback scenario, the performance of RS codes is comparable with both designs of LDPC codes. Our simulations also demonstrate that the performance of RS codes in the presence of inaccuracies in the joint distribution of the sources is much better as compared to multistage LDPC codes.

Comments

This is a manuscript of a proceeding from the IEEE International Symposium on Information Theory (2011): 1861, doi:10.1109/ISIT.2011.6033873. Posted with permission.

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Copyright Owner

IEEE

Language

en

File Format

application/pdf

Published Version

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