Design and Analysis of Protograph-based LDPC Codes in Shallow Water Acoustic Channels
CHEN Zhenhua①② XU Xiaomei① CHEN Yougan① SU Haitao①
①(Key Laboratory of Underwater Acoustic Communication and Marine Information Technology, Xiamen University, Xiamen 361005, China) ②(Department of Teaching and Practice, Guilin University of Electronic Technology, Guilin 541004, China)
ProtoGraph-based Low Density Parity Check (PG-LDPC) codes have many advantages over the conventional LDPC codes, such as simple structure, low iterative decoding threshold, easy extension and linear encoding/decoding complexity. After investigating the characteristics of PG-LDPC codes over the Shallow Water Acoustic (SWA) channels, which have the features of strong multipath interference, long delay spreading and limited bandwidth, a new design scheme to search for good codes is proposed. Furthermore, protograph- degree-distribution-based EXtrinsic Information Transfer (EXIT) chart algorithm is used to predict and analyze the error performances of protograph-based LDPC codes. The simulation and experiment results show that the proposed code outperforms the (3, 6) randomly regular LDPC code in both low and high SNR region, over the SWA channels.
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