【作者】 胡承昊； 王海斌； 台玉朋； 汪俊； 陈德胜；

【Author】 HU Cheng-hao;WANG Hai-bin;TAI Yu-peng;WANG Jun;CHEN De-sheng;State Key Laboratory of Acoustics,Institute of Acoustics,Chinese Academy of Sciences;University of Chinese Academy of Sciences;

【机构】 中国科学院声学研究所声场声信息国家重点实验室； 中国科学院大学；

【摘要】 由于水声通信中信道带宽较窄且干扰严重,使得在保证通信速率的情况下获得更高的可靠性具有重要的研究意义。在水声通信的实际应用中,信息序列经信源编码后仍有部分残留冗余,如果能将信源残留冗余用于译码纠错,则可进一步提升水声通信系统的性能。本文提出了一种将可变长信源编码与LDPC码相结合的信源信道联合译码算法。通过在信源译码器和信道译码器间迭代交换软信息,利用信源残留冗余提高码字抵抗差错的能力。仿真表明,联合译码算法可以有效提升水声通信系统的性能。更多还原

【Abstract】 The channel used by underwater acoustic communication(UAC)has narrow bandwidth with stronger interference.This makes it significative to improve the reliability of UAC under the premise of not slow down the communication rate.In practical application of UAC,there usually have some residual redundancy after source encoding.If we can use the residual redundancy to correct the error in the channel,the performance of UAC system can be improved more.This paper propose an algorithm of joint source-channel decoding which involve the Variable-length code and LDPC code.Soft information is exchanged iteratively between source decoder and channel decoder.Through this method,the error resistance of code words is improved by using residual redundancy of sources.According to the simulation result,this algorithm can improve the performance of UAC system effectively.更多还原