关键词：通信；速率兼容LDPC码；浅海水声通信；水声通信
摘 要：In this paper,we propose rate-compatible LDPC (RC-LDPC) codes to improve the communication system reliability for SWA communications.The proposed SWA system adopting RC-LDPC codes consists of three important preprocessing:channel state information (CSI) estimator,signal-to-noise ratio (SNR) estimator and RC-LDPC pattern.For the estimation error,we define and derive the sensitivity to imperfect CSI and imperfect SNR.Then the design of RC-LDPC codes and SWA channel profile are described.Furthermore,the RC-LDPC performance pattern is given and sensitivity to estimation error of CSI and SNR are analyzed via simulation.It is shown that RC-LDPC codes have good performances with wide range of rates in SWA channels.Finally,coding rate distributions of RC-LDPC codes in different SNR at BER below 10-4 for SWA channel are investigated.