Design and implementation of FPGA-based underwater contactless data transmission system

Abstract Inductive coupling transmission technology overcomes the drawbacks of traditional wired transmission and wireless transmission, and can be used flexibly to achieve stable and reliable real-time transmission. Based on inductive coupling transmission technology, this paper designs an underwater contactless data transmission system based on FPGA. On the basis of system modeling analysis and channel simulation, different influencing factors are analyzed. In the face of the complex underwater channel transmission path, the four-phase absolute phase modulation (DQPSK) modulation and demodulation mode with low bit error rate and good anti-noise performance was selected to improve the transmission performance, and the relevant modulation system and demodulation system were designed, and the feasibility of the system scheme was verified by Modelsim. Finally, through experimental tests, the amplitude-frequency response curve of the system is obtained to explore the relationship between bit error rate and baseband frequency, verify the reliability and stability of the system, and lay a foundation for further research.