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Designing realizable Maximum Likelihood (ML) decoders for low-density parity-check (LDPC) codes has always been a challenging problem. Maxwell decoder is a well-known ML decoder for LDPC codes over a binary erasure channel (BEC). Based on the concept used in the Maxwell decoder, it may be possible to design near-ML decoders for LDPC codes over an additive white Gaussian noise (AWGN) channel. In this...
First a new lattice coding scheme, low density lattice codes (LDLC), and its iterative decoding algorithm are introduced in this paper. Based on circular shift of the candidate sequence and the removal of size-6 loop, a new method is proposed to form a LDLC check matrix with minimum loop size 8. Simulation results show that the performance using the girth-8 check matrix can be improved efficiently.
The features of long delay, great error rate and packet loss, asymmetric bandwidth between uplink and downlink and links easily interrupted in deep space communication determine the technology of encoding and decoding is a difficult issue. The basic conception and features of fountain codes are introduced, and the question of all-selected, degree distribution and the decoding algorithm of fountain...
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