基于MC-FH/DPSK 水声通信信道编码研究  

Research on channel coding of underwater acoustic communication based on MC-FH /DPSK

作　　者：张奕中 岳玲 吕林夏 王明洲 ZHANG yi-zhong;YUE ling;LV lin-xia;WANG ming-zhou(The 705 Research Institute of CSSC,Xi′an 710077,China)

机构地区：[1]中国船舶集团有限公司第七〇五研究所,陕西西安710077

出　　处：《舰船科学技术》2023年第7期144-148,共5页Ship Science and Technology

摘　　要：基于多载波跳频差分相移键控(multi-carrier frequency-hopping/DPSK,MC-FH/DPSK)的水声通信系统,与四进制频移键控(4FSK)跳频通信系统相比,频带利用率成倍提升,但系统误码率仍达不到10^(−5)级。通过将信道编解码技术与MC-FH/DPSK通信系统相结合,使误码率达到10^(−5)级。在实测水声信道下进行了Turbo码及准循环低密度奇偶校验码(QC-LDPC)码的纠错性能仿真,结果表明:实测信道中,2种编码方式在一定信噪比下都能达到10^(−5)的误码率要求,但QC-LDPC码比Turbo码具有更强的纠错性能。在符号持续时间为8 ms,编码速率为1/2,信息长度为840 bit情况下,采用SOVA译码方式的Turbo码,在Eb/N0≥22 dB时误码率低于10^(−5),而采用BP译码方式的QC-LDPC码,在Eb/N0≥20 dB时即可使误码率降至10^(−5)以下,获得了2 dB的信噪比增益。Underwater acoustic communication which based on MC-FH/DPSK has the same anti-multi-path disturbance ability with quadrilateral frequency shift keying,while the frequency band utilization of the former is twice than the latter.However,the BER of the system can not reach 10^(−5).By combining the channel coding and decoding technology with MC-FH/DPSK underwater acoustic communication system,the BER can reach 10^(−5).The error correction performance of Turbo code and QC-LDPC code is simulated under the underwater acoustic channel measured.The simulation results show that both coding method can achieve the communication requirement of BER 10^(−5) under a certain SNR,but QC-LDPC code has better correction performance than Turbo code.When the symbol duration is 8 ms and the information length is 840 bit,the BER of Turbo code using SOVA coding method is lower than 10^(−5) when the Eb/N0 is 22 dB,while the irregular QC-LDPC code using BP decoding method is 20 dB,which obtains the coding gain of 2 dB.

关 键 词：水声信道 跳频多载波通信 TURBO码 LDPC码 

分 类 号：U666[交通运输工程—船舶及航道工程]