Underwater visible light communication method and system

Abstract

Embodiments of the invention disclose an underwater visible light communication method and system. The method comprises the following steps of obtaining an impulse response function of an underwater channel used for transmitting a signal; sampling the impulse response function to obtain a channel characteristic matrix; modulating a to-be-transmitted signal to a plurality of subcarriers through inverse fast Fourier transform (IFFT) and splitting each modulated subcarrier into a plurality of signal blocks; determining zero fill quantity according to sampling quantity of the impulse function and carrying out zero fill processing on the end of each signal block according to the zero fill quantity; making the signal blocks subjected to zero fill processing form serial data and sending the serial data to a light signal source to generate a visible light signal; generating an electric signal according to the visible light signal and carrying out zero-forcing equalization processing on the serial signal according to the channel characteristic matrix; and carrying out fast Fourier transform (FFT) on the signal subjected to the zero-forcing equalization and restoring the to-be-transmitted signal. The method and the system can both consider the communication efficiency and quality and have wide application prospect.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to an underwater visible light communication method and system. Background technique [0002] At present, an underwater visible light communication technology that uses underwater channels to transmit visible light has great application prospects in commercial and military fields. However, due to the absorption and scattering of visible light by water, this situation will cause different time delays for the transmitted photons to reach the receiver, which will cause inter-symbol interference, which limits the transmission performance of underwater visible light communication. Especially in the process of long-distance underwater visible light communication, inter-symbol interference will seriously affect the performance of the communication system and affect the communication quality. Contents of the invention [0003] The purpose of the embodiments of the ...

AI Technical Summary

Problems solved by technology

However, since water absorbs and scatters visible light, this situation will cause different time delays for the transmitted photons to reach the receiver, which in turn will cause inter-symbol interference, which limits the transmission performance of underwater visible light communication.

Especially in the process of long-distance underwater visible light communication, inter-symbol interference will seriously affect the performance of the communication system and affect the communication quality.

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