准循环低密度校验码在浅海水声通信系统中的性能

讨论了准循环低密度校验码(QC-LDPC)在浅海水声信道中的实现方案.选取合适的浅海水声信道模型,针对强多径干扰进行了仿真.仿真结果表明,采用和积译码算法的QC-LDPC码编码复杂度较低,但性能接近于随机构造的低密度校验码.受多径效应影响,在浅海水声系统中采用QC-LDPC码时,信道误码率会随着衰落率的减小而略有下降,但仍能保持较好的纠错性能.

Performance Analysis of Quasi cyclic Low Density Parity Check Codes for Acoustic Communication System in Shallow Water

Based on the suitable channel model, an implementation of quasi-cyclic low density parity check codes (QC-LDPC) for acoustic communication system in shallow water is demonstrated. The simulation of the application shows with the sum-product algorithms, the almost equal performance to that of the random LDPC is obtained with less complexity of QC-LDPC. Although the BER of QC-LDPC in shallow water, which counteracts the violent interference of multipath signals, slightly declines with the decrease of the fading rate, the error-correction performance remains perfect.