基于QC-LDPC的水下激光通信编码技术

doi:10.16180/j.cnki.issn1007-7820.2022.02.003

Abstract

Abstract:

In response to the need for long-distance and reliable communication with underwater blue-green lasers, a modulation and coding communication method combining PPM and QC-LDPC is proposed in this study. By simulating combinations of different code lengths, code rates, and PPM modulation orders, the optimal combination of QC-LDPC coding and PPM modulation under different SNR conditions is found. The principle of the classic PPM signal and the basic structure of the QC-LDPC code are introduced, and the generation of the PPM signal is realized through MATLAB software simulation.The check matrix of QC-LDPC is constructed, and the BER performance curves of different combinations schemes obtained are by simulating different code words. The simulation results show that the performance of QC-LDPC encoding is improved, and QC-LDPC codes with different code lengths and code rates have large differences in BER performance under different SNR conditions. For the same codes under the same SNR conditions, the higher the PPM modulation order, the lower the bit error rate. The BER performance curves of codes with the same code length and different code rates are quite different under the same modulation order.

Key words: quasi-cyclic LDPC code, pulse position modulation, cyclic matrix, base matrix, shift matrix, channel coding, signal to noise ratio, bit error rate

CLC Number:

TN401

GUAN Jingkai,CAI Wenyu,ZHU Zhangfeng,TANG Guodong. Underwater Laser Communication Coding Technology Based on QC-LDPC[J].Electronic Science and Technology, 2022, 35(2): 14-19.

Figures/Tables 5

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Table 1.

References 18

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SNR/dB	码字	码率	PPM调制	带宽利用率	BER
0.0~0.5	(1 536,768)	1/2	16PPM	1/8	<10^-4
0.5~1.5	(1 248,624)	1/2	16PPM	1/8	<10^-4
1.5~2.0	(960,640)	2/3	16PPM	1/8	<10^-4
2.0~3.0	(1 536,768)	1/2	16PPM	1/8	<10^-4
3.0~4.0	(960,720)	3/4	16PPM	1/8	<10^-4
4.0~6.0	--	--	16PPM	1/8	<10^-4
>6.0	--	--	16PPM	1/8	<10^-4

Underwater Laser Communication Coding Technology Based on QC-LDPC

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