LDPC codes for non-uniform memoryless sources and unequal energy allocation

Authors:
Idoia Ochoa;Pedro M. Crespo;Mikel Hernaez
Affiliations:
Centro de Estudios e Investigaciones Técnicas de Gipuzkoa, TECNUN, University of Navarra, San Sebastian, Spain;Centro de Estudios e Investigaciones Técnicas de Gipuzkoa, TECNUN, University of Navarra, San Sebastian, Spain;Centro de Estudios e Investigaciones Técnicas de Gipuzkoa, TECNUN, University of Navarra, San Sebastian, Spain
Venue:
IEEE Communications Letters
Year:
2010

Citing 2
Cited 0

Joint source-channel coding of sources with memory using turbo codes and the burrows-wheeler transform

IEEE Transactions on Communications
Turbo coding of strongly nonuniform memoryless sources with unequal energy allocation and PAM signaling

IEEE Transactions on Signal Processing

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Abstract

In this paper, we design a new energy allocation strategy for non-uniform binary memoryless sources encoded by Low-Density Parity-Check (LDPC) codes and sent over Additive White Gaussian Noise (AWGN) channels. The new approach estimates the a priori probabilities of the encoded symbols, and uses this information to allocate more energy to the transmitted symbols that occur less likely. It can be applied to systematic and non-systematic LDPC codes, improving in both cases the performance of previous LDPC based schemes using binary signaling. The decoder introduces the source non-uniformity and estimates the source symbols by applying the SPA (Sum Product Algorithm) over the factor graph describing the code.