摘要
LDPC码具有编码增益高、译码速度快、可并行译码等特点，是当前编码界的一个研究热点。针对复杂多变、强多途和大起伏干扰的浅海水声信道，建立了LDPC码在浅海水声信道中仿真的模型，仿真研究了浅海水声信道下采用和一积译码算法的LDPC码性能。仿真结果表明，LDPC码在3径多途信道下性能优越；当译码迭代3—5次，码长1000bit左右时基本上能满足水声通信对误码率为10^-4的基本要求。
In this paper, a channel model including time-varying fading, multipath and additive noise for the shallow water acoustic channels is proposed. Based on the channel model, the performances of the LDPC code with sum-product algorithm over shallow water acoustic channel is simulated. The simulation results show that the performance of LDPC code is excellent （Bit error rate less than 10^- 4） over three multipath shallow water acoustic channel, and with 3-5 iterative decoding times and about 1000bit code lengths, is suitable for shallow water acoustic communication.
出处
《通信技术》
2009年第4期41-42,45,共3页
Communications Technology
基金
国家自然科学基金(40776022)
福建省科委重点项目(2006N0042)
关键词
水声信道
LDPC码
多途
和一积算法
shallow water acoustic channel
LDPC code
multipath
sum-product algorithm
