Publications (2)0 Total impact
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Conference Proceeding: Low-Complexity, Low-Memory EMS Algorithm for Non-Binary LDPC Codes
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ABSTRACT: In this paper, we propose a new implementation of the EMS decoder for non binary LDPC codes presented in (D. Declencq and M. Fossorier, 2007). A particularity of the new algorithm is that it takes into accounts the memory problem of the non binary LDPC decoders, together with a significant complexity reduction per decoding iteration. The key feature of our decoder is to truncate the vector messages of the decoder to a limited number nm of values in order to reduce the memory requirements. Using the truncated messages, we propose an efficient implementation of the EMS decoder which reduces the order of complexity to O(n<sub>m</sub> log<sub>2</sub> n<sub>m</sub>), which starts to be reasonable enough to compete with binary decoders. The performance of the low complexity algorithm with proper compensation are quite good with respect to the important complexity reduction, which is shown both with a simulated density evolution approach and actual FER simulations.Communications, 2007. ICC '07. IEEE International Conference on; 07/2007 -
Conference Proceeding: Optimized irregular Gallager codes for OFDM transmission
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ABSTRACT: We present an optimized channel coding scheme for OFDM transmitter. Traditional coding methods use regular codes, in the sense that each bit participates in the same way to the channel encoding. Our approach consists in using a priory assumption on the channel available at the transmitter in order to optimize the coding scheme. We have considered the irregular Gallager block codes in our study. Simulations provide evidence of the usefulness of our approach with a gain of 2 dB at a bit error rate equal to 10<sup>-5</sup> for optimized irregular coding scheme compared to regular one.Personal, Indoor and Mobile Radio Communications, 2002. The 13th IEEE International Symposium on; 10/2002
