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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
- DOI:
- 作者:
- 张奕中, 岳玲, 吕林夏, 王明洲
ZHANG yi-zhong, YUE ling, LV lin-xia, WANG ming-zhou
- 作者单位:
- 中国船舶集团有限公司 第七〇五研究所, 陕西 西安 710077
The 705 Research Institute of CSSC, Xi'an 710077, China
- 关键词:
- 水声信道;跳频多载波通信;Turbo码;LDPC码
underwater acoustic channel; muti-carrier frequency-hopping communication; Turbo code; LDPC code
- 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.
2023,45(7): 144-148 收稿日期：2022-08-29
DOI：10.3404/j.issn.1672-7649.2023.07.027
分类号：U666
作者简介：张奕中(1996-),男,硕士研究生,研究方向为水声通信技术
