摘要
为进一步提高水声通信可靠性和频带利用率,针对极化编码调制的水声通信需求和信道特性,基于蒙特卡洛法提出动态水声信道认知优化统计目标参数、联合译码的判决反馈信道估计两点改进,建立了适用于编码调制水声信道中的极化码构造算法。为验证该算法性能,建立了极化编码调制水声通信的两步应用机制。通过仿真,比对并分析改进前后的极化码构造方法性能、对时变信道的鲁棒性,以及在不同映射规则下的联合比特交织和多级编码的极化编码调制水声通信性能,并与低密度校验(LDPC)编码调制系统进行对比。湖试结果表明,提出的极化编码调制水声通信方案有效保证了信息在浅水水声信道中的可靠传输,在信噪比约为14 dB、通信距离约1 km时,实现无误码传输,性能优于相同条件下的LDPC编码调制系统。
To further improve the reliability and band efficiency of the underwater acoustic communication(UWC),this paper offers a polar code construction algorithm based on the Monte Carlo method with two improvements for polar coded modulation(PCM)communication needs and the underwater acoustic(UWA)channel characteristics to match the underwater acoustic polarized channel of coded modulation.These optimizations are optimizing Monte Carlo statistics parameters based on the dynamical cognitive of the channel,and jointing decoding and decision feedback channel estimation.The proposed polar code construction method is then verified by establishing a two-step PCM UWC application mechanism.Through simulation,the performance of polar code construction methods before and after improvement,and the robustness to time-varying channels are then compared and analyzed,as well as the performance of polar code modulated UWC system with joint bit-interleaved coded modulation(BICM)and combination with multilevel coded modulation(MLCM)under different mapping rules.Also,it is compared with the low density parity check(LDPC)coded modulation system.The lake experiment demonstrates that the PCM UWC scheme suggested in this paper effectively ensures the reliable transmission of information in the shallow water channel,achieves error-free transmission at a signal-to-noise ratio of about 14 dB and a communication distance of about 1 km,and also has better error correction than the LDPC coded modulation system under the same circumstances.
作者
翟玉爽
冯海泓
李记龙
洪峰
ZHAI Yushuang;FENG Haihong;LI Jilong;HONG Feng(Shanghai Acoustics Laboratory,Chinese Academy of Sciences,Shanghai,201815;University of Chinese Academy of Sciences,Beijing,100049)
出处
《声学学报》
EI
CAS
CSCD
北大核心
2023年第3期482-495,共14页
Acta Acustica
基金
崂山实验室科技创新项目(LSKJ202205105)
重点实验室基金项目(2022-JCJQ-LB-033-07)资助。
关键词
水声通信
信道编码
正交频分复用
极化码
编码调制
Underwater acoustic communication
Channel coding
Orthogonal frequency division multiplexing
Polar code
Coded-modulation
