Research On Low Complexity Underwater Wireless Laser Communication Verification System

Underwater wireless optical communication has the characteristics of wide band,low complexity,high security and so on.It is a new choice and research hot spot for the realization of underwater high-speed data communication in the future.Aiming at the application of underwater laser communication,a low complexity underwater wireless laser communication verification system is designed.The key technologies such as modulation and synchronization in the wireless laser communication channel are studied to realize the reliable voice transmission based on underwater laser communication.Firstly,according to the system architecture and function design,the underwater wireless laser communication verification system is built.The sending end acquires the voice data and data transmission is realized by laser pulse OOK modulation signal.The receiving end converts the optical signal to electrical signal through the front end of optical receiving.And the computer software is used to achieve data processing such as synchronization,decoding and so on.Finally,the voice data is obtained and played in the software.Further,based on the verification system of underwater wireless laser communication,the speech processing,high performance coding technology,OOK modulation and synchronization technology are studied.Especially considering the characteristics of the asymmetric channel of the wireless laser communication,the OOK decision threshold is optimized based on the verification platform to reduce the bit error rate of the system.And in this special channel,the correlation detection frame synchronization is realized by an optimized sequence,improving the frame synchronization performance.Finally,the performance test and analysis of the low complexity underwater wireless laser communication verification system are carried out in this paper.The test results show that the system can overcome the influence of seawater channel and achieve low cost,low complexity and high reliability voice transmission based on underwater wireless laser communication.