Aiming to solve the problems of the atmospheric turbulence in free-space optical communications which cause the increase of the system bit error and influence the communication stability, an algorithm is proposed to suppress the influence of atmospheric turbulence. This algorithm combines traditional grouped matrix interleaver and random interleaver design methods to construct a new type of interleaving matrix to solve the turbulence effect under different atmospheric conditions. A field programmable gate array (FPGA) board with external DDR3 is used to implement the algorithm and optimize the delay. The results show that the algorithm is accurate and reliable in different turbulence models. At the same time, the impact of turbulence effects on link performance can be reduced to a certain extent.
Underwater wireless optical communication can realize short-distance, high-speed communication. It effectively supplements the vacancy of optical cable communication, radio communication and underwater acoustic communication in underwater networking. Using Orthogonal Frequency Division Multiplexing (OFDM) technology in underwater wireless optical communication can effectively reduce the influence of multipath effects in the channel and improve system communication performance. The error correction ability of Reed-solomon (RS) code under medium code length is close to the theoretical value. This letter analyzes the underwater optical channel model, simulates the underwater optical communication system based on RS coding and OFMD, and studies the influence of communication distance and signal-to-noise ratio (SNR) on bit error rate (BER), as well as the error code distribution in the presence of Doppler shift and the impact of interleaving on system performance. The simulation results show that the BER of received signal increases with the increase of communication distance and the decrease of SNR; When Doppler shift exists, error codes appear in concentrated positions. Deep interleaving can effectively utilize the error correction ability of RS coding, reduce the influence of Doppler shift, and improve the communication quality of the system.
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