摘要
在水声通信中,有些情况下系统中要求误码率非常低,仅仅靠信道编码的方法不能满足通信质量要求。循环冗余校验码(CRC)是一种性能良好的循环码,非常适用于检错系统,低密度校验码(LDPC)性能接近香农极限的信道编码之一,其译码复杂度远远小于Turbo码。为了满足低误码率的要求,提出了一种将LDPC码和自动重发请求(ARQ)结合应用的方法,在CRC校验之后进行信道编码,在保证通信质量的前提下尽量减小发送信息的冗余度。仿真结果表明,该方法可以将误码率降低到10-9以下。
It is required very low bit-error probabilities in some special underwater acoustic communication systems,and just depending on forward error code cannot satisfy the request of communication quality.Circle Redundancy Check(CRC) is a kind of circle code with good performance,and it is suitable for check error system.The performance of Low Density Parity Check codes (LDPC) is nearly Shannon limit with lower complexity compared with Turbo codes.h is proposed a method that LDPC code and automatic request for repetition can be combined together,added LDPC after CRC.Simulation results indicate that bit-error probabilities can be descended to below 10^-9.
出处
《计算机工程与应用》
CSCD
北大核心
2008年第34期20-22,共3页
Computer Engineering and Applications
基金
国家自然科学基金No.60572098~~
关键词
自动重发请求
低密度校验码
循环冗余校验
误码率
信噪比
Automatic Repeat-reQuest(ARQ)
Low Density Parity Check code(LDPCC)
Cyclic Redundancy Check(CRC)
error bit rate
signal noise ratio