DESIGN OF LDPC-CODED MODULATIONS FOR FAST ITERATIVE DECODING (SIG8)

Author(s) : Michele Franceschini (University of Parma, Italy) Gianluigi Ferrari (University of Parma, Italy) Riccardo Raheli (University of Parma, Italy)

Abstract : In this paper, we propose an EXIT chart-based approach to code design for low-density parity-check (LDPC)- coded modulations. In particular, the adopted technique iteratively modifies the LDPC code degree distribution in order to achieve a target bit error rate (BER) at a given (and possibly small) number of iterations. In this paper, we limit ourselves to communication systems on a binary erasure channel (BEC), but the proposed approach is general. The optimized codes for a BEC give significant insights into the impact of the degree distributions on the BER performance.

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