准循环低密度校验码在浅海水声通信系统中的性能

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

摘要:

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.

关键词:准循环低密度校验码; 浅海水声信道; 和积算法; 多径

Abstract:

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.

Key words:QCLDPC; the channel in shallow water acoustic; sumproduct algorithms; multipath